SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    Form 8-K

                Current Report Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported): March 4, 2002
                                                           -------------


                               IMMUNOMEDICS, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


Delaware                           0-12104                     61-1009366
- -------------------------------------------------------------------------------
(State or other                  (Commission                  (IRS Employer
jurisdiction                    File Number)               Identification No.)
of incorporation)


300 American Road, Morris Plains, New Jersey                      07950
- -------------------------------------------------------------------------------
(Address of principal executive offices)                        (Zip Code)


     Registrant's telephone number, including area code: (973) 605-8200
                                                         --------------


                                 Not applicable
- -------------------------------------------------------------------------------
          (Former name or former address, if changed since last report)



                                       1



Item 5. Other Events.
        ------------

     On February 28, 2002,  the Board of Directors of  Immunomedics,  Inc.  (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each  outstanding  share of Common  Stock,  par value  $0.01 per share  (the
"Common  Shares")  outstanding  on March  15,  2002 (the  "Record  Date") to the
stockholders of record on that date.  Each Right entitles the registered  holder
to purchase  from the Company one  one-thousandth  of a share of Series G Junior
Participating  Preferred  Stock,  par  value  $0.01 per  share  (the  "Preferred
Shares"),  of the  Company,  at a price of $150.00 per one  one-thousandth  of a
Preferred Share (the "Purchase Price"),  subject to adjustment.  The description
and  terms  of the  Rights  are set  forth in a Rights  Agreement  (the  "Rights
Agreement")  between the Company and American  Stock Transfer and Trust Company,
as Rights  Agent (the  "Rights  Agent").  All  capitalized  terms not  otherwise
defined  herein shall be deemed to have the meaning  ascribed  such terms in the
Rights Agreement.

     Until the earlier to occur of (i) 10 days  following a public  announcement
that a person  or group of  affiliated  or  associated  persons  (an  "Acquiring
Person")  has  acquired  beneficial  ownership of 15% or, in the case of certain
existing stockholders,  together with their respective Affiliates or Associates,
who,  as of  February  28,  2002,  beneficially  owned 15% or more of the Common
Shares ("Existing Holders") and such other Person who or which is the Beneficial
Owner of Common  Shares  beneficially  owned by any such  existing  stockholders
(such Existing Holders and Persons,  collectively,  "Grandfathered Stockholders"
and such other Person who are not Existing Holders as described  above,  "Second
Tier Grandfathered Stockholders",  such higher percentage as is specified in the
Rights Agreement,  or more of the outstanding  Common Shares or (ii) 10 business
days  (or  such  later  date as may be  determined  by  action  of the  Board of
Directors  prior  to such  time  as any  Person  becomes  an  Acquiring  Person)
following the commencement of, or announcement of an intention to make, a tender
offer or exchange offer the consummation of which would result in the beneficial
ownership  by a  person  or  group  of 15% or,  in the  case of a  Grandfathered
Stockholder  or a Second  Tier  Grandfathered  Stockholder,  respectively,  such
percentage as is specified in the Rights  Agreement,  or more of the outstanding
Common Shares (the earlier of such dates being called the "Distribution  Date"),
the  Rights  will  be  evidenced,  with  respect  to  any of  the  Common  Share
certificates outstanding as of the Record Date, by such Common Share certificate
with a copy of this Summary of Rights attached thereto.

     The Rights Agreement provides that, until the Distribution Date, the Rights
will be transferred with and only with the Common Shares. Until the Distribution
Date (or earlier  redemption  or  expiration  of the  Rights),  new Common Share
certificates  issued  after the Record Date or upon  transfer or new issuance of
Common  Shares will  contain a notation  incorporating  the Rights  Agreement by
reference.  Until the Distribution Date (or earlier  redemption or expiration of
the Rights),  the surrender for transfer of any  certificates  for Common Shares
outstanding as of the Record Date,  even without such notation or a copy of this
Summary of Rights being attached  thereto,  will also constitute the transfer of
the Rights associated with the Common Shares represented by such certificate. As
soon as  practicable  following the  Distribution  Date,  separate  certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of record
of the Common  Shares as of the Close of Business on the  Distribution  Date and
such separate Right Certificates alone will evidence the Rights.

                                       2


     The Rights are not exercisable until the Distribution Date. The Rights will
expire  on March 1,  2012  (the  "Final  Expiration  Date"),  unless  the  Final
Expiration  Date is extended  or unless the Rights are  earlier  redeemed by the
Company, in each case, as described below.

     The Purchase  Price  payable,  and the number of Preferred  Shares or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from time to time to  prevent  dilution  (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or  warrants  to  subscribe  for or  purchase  Preferred  Shares at a price,  or
securities  convertible into Preferred Shares with a conversion price, less than
the  then  current  market  price of the  Preferred  Shares  or  (iii)  upon the
distribution to holders of the Preferred  Shares of evidences of indebtedness or
assets  (excluding  regular  periodic  cash  dividends  paid out of  earnings or
retained  earnings or dividends  payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

     The number of outstanding Rights and the number of one one-thousandths of a
Preferred  Share  issuable  upon  exercise  of each  Right are also  subject  to
adjustment  in the  event  of a stock  split  of the  Common  Shares  or a stock
dividend  on the  Common  Shares  payable  in  Common  Shares  or  subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

     Preferred  Shares  purchasable  upon  exercise  of the  Rights  will not be
redeemable.  Each  Preferred  Share will be  entitled  to a  quarterly  dividend
payment of 1,000 times the dividend  declared per Common Share.  In the event of
liquidation,  the  holders  of the  Preferred  Shares  will  be  entitled  to an
aggregate  payment of 1,000 times the  aggregate  payment made per Common Share.
Each  Preferred  Share will have 1,000 votes,  voting  together  with the Common
Shares. In the event of any merger,  consolidation or other transaction in which
Common Shares are exchanged,  each  Preferred  Share will be entitled to receive
1,000 times the amount received per Common Share.  These rights are protected by
customary anti-dilution provisions.

     Because of the nature of the Preferred  Shares'  dividend,  liquidation and
voting rights, the value of the one one-thousandth interest in a Preferred Share
purchasable  upon  exercise of each Right  should  approximate  the value of one
Common Share.

     From and after the occurrence of an event described in Section 11(a)(ii) of
the Rights Agreement, if the Rights evidenced by a Right Certificate are or were
at any time on or after the  earlier  of (x) the date of such  event and (y) the
Distribution  Date acquired or beneficially  owned by an Acquiring  Person or an
Associate or Affiliate of an Acquiring  Person (as such terms are defined in the
Rights Agreement),  such Rights shall become void, and any holder of such Rights
shall thereafter have no right to exercise such Rights.

     In the event that, at any time after a Person becomes an Acquiring  Person,
the Company is acquired in a merger or other business combination transaction or
50% or more of its  consolidated  assets  or  earning  power  are  sold,  proper
provision will be made so that each holder of a Right will  thereafter  have the
right to receive,  upon the exercise  thereof at the then current exercise price
of the Right,  that number of shares of common  stock of the  acquiring  company
which at the time of such  transaction will have a market value of two times the
exercise  price of the Right.  In the event that any person becomes an Acquiring

                                       3



Person,  proper  provision  shall be made so that each holder of a Right,  other
than Rights  beneficially  owned by the Acquiring  Person and its Affiliates and
Associates  (which will  thereafter be void),  will thereafter have the right to
receive upon  exercise that number of Common Shares having a market value of two
times the exercise price of the Right.  If the Company does not have  sufficient
Common Shares to satisfy such obligation to issue Common Shares, or if the Board
of Directors so elects,  the Company  shall deliver upon payment of the exercise
price of a Right an  amount  of cash or  securities  equivalent  in value to the
Common Shares  issuable upon exercise of a Right;  provided that, if the Company
fails to meet such obligation within 30 days following the date a Person becomes
an Acquiring  Person,  the Company must  deliver,  upon  exercise of a Right but
without  requiring  payment of the exercise price then in effect,  Common Shares
(to the extent available) and cash equal in value to the difference  between the
value of the Common Shares  otherwise  issuable upon the exercise of a Right and
the exercise price then in effect.  The Board of Directors may extend the 30-day
period  described  above for up to an additional 60 days to permit the taking of
action that may be necessary to authorize sufficient additional Common Shares to
permit the issuance of Common Shares upon the exercise in full of the Rights.

     At any time after any Person  becomes an Acquiring  Person and prior to the
acquisition  by any  person or group of a  majority  of the  outstanding  Common
Shares,  the Board of Directors  of the Company may  exchange the Rights  (other
than Rights owned by such person or group which have become  void),  in whole or
in part,  at an  exchange  ratio of one  Common  Share  per  Right  (subject  to
adjustment).

     With  certain  exceptions,  no  adjustment  in the  Purchase  Price will be
required until  cumulative  adjustments  require an adjustment of at least 1% in
such Purchase Price. No fractional  Preferred  Shares will be issued (other than
fractions  which are  integral  multiples of one  one-thousandth  of a Preferred
Share,  which may, at the  election of the Company,  be evidenced by  depositary
receipts) and in lieu  thereof,  an adjustment in cash will be made based on the
market price of the  Preferred  Shares on the last trading day prior to the date
of exercise.

     At any time prior to the time any Person becomes an Acquiring  Person,  the
Board of  Directors  of the Company  may redeem the Rights in whole,  but not in
part, at a price of $0.001 per Right (the "Redemption Price"). The redemption of
the  Rights  may be made  effective  at such  time,  on such basis and with such
conditions  as the Board of  Directors  in its sole  discretion  may  establish.
Immediately upon any redemption of the Rights,  the right to exercise the Rights
will  terminate  and the only right of the  holders of Rights will be to receive
the Redemption Price.

     The terms of the Rights may be  amended  by the Board of  Directors  of the
Company  without the consent of the holders of the Rights,  except that from and
after such time as any person becomes an Acquiring  Person no such amendment may
adversely  affect the  interests  of the  holders of the Rights  (other than the
Acquiring Person and its Affiliates and Associates).

     Until a Right is  exercised,  the  holder  thereof,  as such,  will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

     The Rights  Agreement,  dated  March 4, 2002,  specifying  the terms of the
Rights and including the form of the Certificate of  Designations  setting forth

                                       4


the terms of the Preferred Shares as an exhibit  thereto,  is attached hereto as
an exhibit and is incorporated herein by reference. The foregoing description of
the Rights does not purport to be complete  and is  qualified in its entirety by
reference to the attached exhibit.

     On March  4,  2002,  the  Company  publicly  disseminated  a press  release
announcing  that  the  Board  of  Directors  of the  Company  adopted  the  2002
Stockholders Rights Plan to protect its stockholders.  The information contained
in the press  release is  incorporated  herein by reference and filed as Exhibit
99.1 hereto.

Item 7.  Financial Statements, Pro Form Financial Information and Exhibits.
         -----------------------------------------------------------------

(a)      Financial statements of business acquired.
         -----------------------------------------

Not Applicable

(b)      Pro forma financial information.
         -------------------------------

Not Applicable.

(c)      Exhibits.
         --------

              Exhibit
              No.                               Description
              -------                           -----------

              4.1   Rights  Agreement,  dated  as  of  March  4,  2002,  between
                    Immunomedics,  Inc.  and  American  Stock  Transfer  & Trust
                    Company,   which   includes  the  form  of   Certificate  of
                    Designations  setting forth the terms of the Series G Junior
                    Participating  Preferred Stock,  $0.01 par value, as Exhibit
                    A,  the  form of  Right  Certificate  as  Exhibit  B and the
                    Summary of Rights to Purchase Preferred Shares as Exhibit C.

              99.1  Registrant's Press Release, issued March 4, 2002.

                                       5





                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, hereunto duly authorized.


                                    IMMUNOMEDICS, INC.


Dated:  March 7, 2002               By:   /s/ Gerard G. Gorman
                                          --------------------------------------
                                          Gerard G. Gorman
                                          Chief Financial Officer




                                       6






                                  EXHIBIT INDEX




    Exhibit No.                       Description
    ----------                        -----------

        4.1         Rights  Agreement,  dated  as  of  March  4,  2002,  between
                    Immunomedics,  Inc.  and  American  Stock  Transfer  & Trust
                    Company,   which   includes  the  form  of   Certificate  of
                    Designations  setting forth the terms of the Series G Junior
                    Participating  Preferred Stock,  $0.01 par value, as Exhibit
                    A,  the  form of  Right  Certificate  as  Exhibit  B and the
                    Summary of Rights to Purchase Preferred Shares as Exhibit C.

        99.1        Registrant's Press Release, issued March 4, 2002.



                                       7




                                  EXHIBIT 4.1
                                  -----------




                               IMMUNOMEDICS, INC.


                                       and


                    AMERICAN STOCK TRANSFER AND TRUST COMPANY



                                  Rights Agent



                                RIGHTS AGREEMENT




                            Dated as of March 4, 2002























                                TABLE OF CONTENTS
                                -----------------
                                                                                    Page
                                                                                    ----
                                                                                

Section 1.        Certain Definitions..................................................1
Section 2.        Appointment of Rights Agent..........................................4
Section 3.        Issue of Right Certificates..........................................4
Section 4.        Form of Right Certificates...........................................6
Section 5.        Countersignature and Registration....................................6
Section 6.        Transfer,  Split Up,  Combination  and Exchange of Right
                  Certificates;  Mutilated,  Destroyed,  Lost or Stolen Right
                  Certificates.........................................................7
Section 7.        Exercise of Rights; Purchase Price; Expiration Date of Rights........7
Section 8.        Cancellation and Destruction of Right Certificates...................9
Section 9.        Status and Availability of Preferred Shares..........................9
Section 10.       Preferred Shares Record Date........................................10
Section 11.       Adjustment of Purchase Price, Number of Shares or Number of Rights..10
Section 12.       Certificate of Adjustment...........................................16
Section 13.       Consolidation, Merger or Sale or Transfer of Assets.................17
Section 14.       Fractional Rights and Fractional Shares.............................17
Section 15.       Rights of Action....................................................18
Section 16.       Agreement of Right Holders..........................................19
Section 17.       Right Certificate Holder Not Deemed a Stockholder...................19
Section 18.       Concerning the Rights Agent.........................................20
Section 19.       Merger or Consolidation or Change of Name of Rights Agent...........20
Section 20.       Duties of Rights Agent..............................................21
Section 21.       Change of Rights Agent..............................................23
Section 22.       Issuance of New Right Certificates..................................23
Section 23.       Redemption..........................................................24
Section 24.       Exchange............................................................24
Section 25.       Notice of Certain Events............................................26
Section 26.       Notices.............................................................26
Section 27.       Supplements and Amendments..........................................27
Section 28.       Successors..........................................................28
Section 29.       Benefits of this Agreement..........................................28
Section 30.       Severability........................................................28
Section 31.       Governing Law.......................................................28
Section 32.       Counterparts........................................................28
Section 33.       Descriptive Headings................................................28
Section 34.       Administration......................................................28



                                     - i -




                                RIGHTS AGREEMENT


     Agreement,  dated  as of March  4,  2002,  between  Immunomedics,  Inc.,  a
Delaware  corporation  (the  "Company"),  and  American  Stock  Transfer & Trust
Company (the "Rights Agent").

     The Board of  Directors  of the  Company  has  authorized  and  declared  a
dividend of one  preferred  share  purchase  right (a "Right") for each share of
Common  Stock,  par value  $0.01 per share,  of the  Company (a "Common  Share")
outstanding  on the Close of Business on March 15, 2002 (the "Record  Date") and
has authorized the issuance of one Right with respect to each additional  Common
Share that shall become outstanding  between the Record Date and the earliest of
the Close of Business on the  Distribution  Date,  the  Redemption  Date and the
Close of Business on the Final Expiration Date, and certain additional shares of
Common  Stock that  shall  become  outstanding  after the  Distribution  Date as
provided in Section 22 of this Agreement,  each Right  representing the right to
purchase one  one-thousandth of a Preferred Share (as hereinafter  defined),  or
such  different  amount  and/or  kind of  securities  as  shall  be  hereinafter
provided.

     Accordingly,  in  consideration  of the premises and the mutual  agreements
herein set forth, the parties hereby agree as follows:

     Section 1. Certain Definitions.
                -------------------

     For  purposes of this  Agreement,  the  following  terms have the  meanings
indicated:

     "Acquiring  Person"  shall mean any Person who or which,  together with all
Affiliates and Associates of such Person,  shall be the Beneficial Owner of 15%,
or in the case of (i) a  Grandfathered  Stockholder  other  than a  Second  Tier
Grandfathered Stockholder, 19%, or (ii) a Second Tier Grandfathered Stockholder,
the  greater  of 15% or such  percentage  as is equal to the  percentage  of the
outstanding   Common  Shares  represented  by  such  Second  Tier  Grandfathered
Stockholder's  Second Tier  Shares plus 1%, or more of the Common  Shares of the
Company  then  outstanding  but  shall not  include  (i) the  Company,  (ii) any
Subsidiary of the Company,  (iii) any employee benefit plan of the Company or of
any  Subsidiary of the Company,  or (iv) any entity holding Common Shares for or
pursuant to the terms of any such  employee  benefit plan.  Notwithstanding  the
foregoing,  (1) no Person shall become an "Acquiring Person" as the result of an
acquisition  of Common  Shares by the Company  which,  by reducing the number of
shares  outstanding,  increases the proportionate  number of shares beneficially
owned by such Person to 15% (or such other  percentage as would otherwise result
in such person becoming an Acquiring Person) or more of the Common Shares of the
Company then outstanding;  provided,  however,  that if a Person shall so become
the  Beneficial  Owner of 15% (or such other  percentage)  or more of the Common
Shares of the Company then  outstanding  by reason of an  acquisition  of Common
Shares by the  Company and shall,  after such share  purchases  by the  Company,
become the Beneficial Owner of an additional 1% of the outstanding Common Shares
of the Company,  then such Person shall be deemed to be an  "Acquiring  Person,"
and (2) if the Board of Directors of the Company determines in good faith that a
Person who would otherwise be an "Acquiring  Person," as defined pursuant to the
foregoing provisions of this paragraph, has become such inadvertently,  and such
Person divests as promptly as  practicable a sufficient  number of Common Shares
so that such  Person  would no  longer  be an  "Acquiring  Person,"  as  defined
pursuant to the foregoing  provisions of this paragraph,  then such Person shall
not be deemed to have  become an  "Acquiring  Person"  for any  purposes of this
Agreement.

                                    - 1 -



     "Affiliate" and "Associate" shall have the respective  meanings ascribed to
such  terms  in Rule  12b-2 of the  General  Rules  and  Regulations  under  the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act"), as in effect
on the date of this Agreement.

     A Person shall be deemed the  "Beneficial  Owner" of and shall be deemed to
"beneficially own" any securities:

          (i) which such Person or any of such Person's Affiliates or Associates
     beneficially owns, directly or indirectly;

          (ii)  which  such  Person  or  any  of  such  Person's  Affiliates  or
     Associates has (A) the right to acquire  (whether such right is exercisable
     immediately  or only after the passage of time)  pursuant to any agreement,
     arrangement  or  understanding  (other than customary  agreements  with and
     between  underwriters and selling group members with respect to a bona fide
     public offering of securities),  written or otherwise, or upon the exercise
     of  conversion  rights,  exchange  rights,  rights (other than the Rights),
     warrants or options, or otherwise;  provided,  however, that a Person shall
     not be  deemed to be the  Beneficial  Owner  of,  or to  beneficially  own,
     securities  tendered  pursuant to a tender or exchange  offer made pursuant
     to,  and  in  accordance   with,  the  applicable   rules  and  regulations
     promulgated under the Exchange Act by or on behalf of such Person or any of
     such Person's  Affiliates or Associates until such tendered  securities are
     accepted for purchase or exchange; or (B) the right to vote pursuant to any
     agreement,  arrangement or understanding;  provided, however, that a Person
     shall not be deemed the Beneficial  Owner of, or to  beneficially  own, any
     security  if the  agreement,  arrangement  or  understanding  to vote  such
     security (1) arises solely from a revocable  proxy or consent given to such
     Person in response to a public proxy or consent  solicitation made pursuant
     to,  and  in  accordance   with,  the  applicable   rules  and  regulations
     promulgated  under the Exchange Act and (2) is not also then  reportable on
     Schedule  13D  under  the  Exchange  Act (or any  comparable  or  successor
     report); or

          (iii) which are  beneficially  owned,  directly or indirectly,  by any
     other Person with which such Person or any of such  Person's  Affiliates or
     Associates has any  agreement,  arrangement  or  understanding  (other than
     customary  agreements  with and  between  underwriters  and  selling  group
     members with respect to a bona fide public offering of securities), written
     or otherwise, for the purpose of acquiring,  holding, voting (except to the
     extent  contemplated  by the  proviso  to  section  (B) of the  immediately
     preceding paragraph (ii)) or disposing of any securities of the Company.

     Notwithstanding  anything in this definition of Beneficial Ownership to the
contrary,  the phrase "then outstanding," when used with reference to a Person's
Beneficial Ownership of securities of the Company, shall mean the number of such
securities  then  issued  and  outstanding  together  with  the  number  of such
securities not then actually issued and  outstanding  which such Person would be
deemed to own beneficially hereunder.

                                     - 2 -


     "Business Day" shall mean any day other than a Saturday,  Sunday,  or a day
on which  banking  institutions  in the  State of New  York  are  authorized  or
obligated by law or executive order to close.

     "Close of  Business"  on any given  date  shall  mean  5:00  P.M.,  Eastern
Standard  Time,  on such  date;  provided,  however,  that if such date is not a
Business  Day it shall  mean  5:00  P.M.,  Eastern  Standard  Time,  on the next
succeeding Business Day.

     "Common  Shares"  when used with  reference  to the Company  shall mean the
shares of Common  Stock,  par value  $.01 per  share,  of the  Company.  "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or equity  interest)  with the greatest  voting power of such
other  Person or, if such other Person is a Subsidiary  of another  Person,  the
Person or Persons which ultimately control such first-mentioned Person.

     "Common  Share  Equivalents"  shall have the  meaning  set forth in Section
11(a)(iii)(B)(3) hereof.

     "Current   Value"   shall   have  the   meaning   set   forth  in   Section
11(a)(iii)(A)(1) hereof.

     "Distribution  Date"  shall  have the  meaning  set forth in  Section  3(a)
hereof.  "equivalent  preferred  shares"  shall  have the  meaning  set forth in
Section 11(b) hereof.

     "Exchange Ratio" shall have the meaning set forth in Section 24(a) hereof.

     "Final Expiration Date" shall mean March 1, 2012.

     "Grandfathered  Stockholder" shall mean (i) each stockholder that, together
with its  Affiliates and Associates  (each an "Existing  Holder"),  beneficially
owns,  as of the date of adoption of this  Agreement,  15% or more of the Common
Shares;  and (ii) any  Person  not  covered  by (i)  above,  who or which is the
Beneficial Owner of Common Shares beneficially owned by an Existing Holder (each
such  Person  a  "Second  Tier  Grandfathered  Stockholder"  and the  shares  so
beneficially  owned, such Second Tier GrandFathered  Stockholder's  "Second Tier
Shares").

     "Person" shall mean any individual, firm, corporation, partnership, limited
partnership,  limited liability  partnership,  business trust, limited liability
company,  unincorporated  association  or other  entity,  and shall  include any
successor (by merger or otherwise) of such entity.

     "Purchase Price" shall have the meaning set forth in Section 7(b) hereof.

     "Preferred  Shares"  shall  mean  shares of  Series G Junior  Participating
Preferred  Stock,  par value $0.01 per share,  of the Company having such rights
and  preferences as are set forth in the form of Certificate of Designation  set
forth as Exhibit A hereto, as the same may be amended from time to time.

                                     - 3 -



     "Redemption Date" shall have the meaning set forth in Section 23 hereof.

     "Right  Certificate"  shall  mean  a  certificate  evidencing  a  Right  in
substantially the form of Exhibit B hereto.

     "Section  11(a)(ii)  Trigger  Date"  shall  have the  meaning  set forth in
Section 11(a)(iii) hereof.

     "Shares  Acquisition  Date"  shall mean the  earlier of the date of (i) the
public  announcement  by the Company or an  Acquiring  Person that an  Acquiring
Person has become such or (ii) the public  disclosure of facts by the Company or
an Acquiring Person indicating that an Acquiring Person has become such.

     "Spread" shall have the meaning set forth in Section 11(a)(iii)(A) hereof.

     "Subsidiary" of any Person shall mean any Person of which a majority of the
voting  power of the  voting  equity  securities  or equity  interest  is owned,
directly or indirectly, by such Person.

     "Substitution   Period"  shall  have  the  meaning  set  forth  in  Section
11(a)(iii) hereof.

     "Summary of Rights" shall mean the Summary of Rights to Purchase  Preferred
Shares in substantially the form of Exhibit C hereto.

     Section 2. Appointment of Rights Agent.
                ---------------------------

     The  Company  hereby  appoints  the  Rights  Agent to act as agent  for the
Company and the holders of the Rights (who, in accordance with Section 3 hereof,
shall prior to the  Distribution  Date also be the holders of the Common Shares)
in accordance with the terms and conditions  hereof, and the Rights Agent hereby
accepts  such  appointment.  The  Company  may from  time to time  appoint  such
co-Rights Agents as it may deem necessary or desirable.

     Section 3. Issue of Right Certificates.
                ---------------------------

     (a) Until the  earlier  of (i) the tenth day after the  Shares  Acquisition
Date or (ii) the tenth  Business Day (or such later date as may be determined by
action of the Board of Directors of the Company prior to such time as any Person
becomes an Acquiring  Person) after the date of the  commencement  by any Person
(other than the Company,  any  Subsidiary of the Company,  any employee  benefit
plan of the Company or of any  Subsidiary of the Company,  or any entity holding
Common Shares for or pursuant to the terms of any such plan) of, or of the first
public  announcement  of the  intention  of any  Person  (other  than any of the
Persons  referred to in the preceding  parenthetical)  to commence,  a tender or
exchange offer the consummation of which would result in any Person becoming the
Beneficial  Owner of  Common  Shares  aggregating  15% or,  in the case of (i) a

                                     - 4 -



Grandfathered  Stockholder other than a Second Tier  Grandfathered  Stockholder,
19%, or (ii) a Second Tier Grandfathered Stockholder, the greater of 15% or such
percentage as is beneficially  owned by each Existing Holder plus 1%, or more of
the then  outstanding  Common Shares (such date being herein  referred to as the
"Distribution  Date"),  (x)  the  Rights  will  be  evidenced  (subject  to  the
provisions  of Section  3(b)  hereof)  by the  certificates  for  Common  Shares
registered in the names of the holders thereof (which certificates shall also be
deemed to be Right Certificates) and not by separate Right Certificates, and (y)
the right to receive Right  Certificates will be transferable only in connection
with  the  transfer  of  Common  Shares.   As  soon  as  practicable  after  the
Distribution  Date, the Company will prepare and execute,  the Rights Agent will
countersign, and the Company will send or cause to be sent (and the Rights Agent
will,  if  requested,  at the  expense  of the  Company,  send) by  first-class,
insured,  postage-prepaid mail, to each record holder of Common Shares as of the
Close of Business on the Distribution  Date, at the address of such holder shown
on the records of the Company, a Right Certificate evidencing one Right for each
Common Share so held. As of the Distribution  Date, the Rights will be evidenced
solely by such Right Certificates.

     (b) On the Record Date, or as soon as practicable  thereafter,  the Company
will send a copy of the Summary of Rights by first-class,  postage-prepaid mail,
to each record holder of Common Shares as of the Close of Business on the Record
Date,  at the address of such holder shown on the records of the  Company.  With
respect to  certificates  for Common Shares  outstanding  as of the Record Date,
until the  Close of  Business  on the  Distribution  Date,  the  Rights  will be
evidenced by such  certificates  registered in the names of the holders  thereof
together with a copy of the Summary of Rights attached thereto.  Until the Close
of Business on the  Distribution  Date (or the earlier of the Redemption Date or
the Close of Business on the Final Expiration  Date), the surrender for transfer
of any  certificate  for Common Shares  outstanding on the Record Date,  with or
without a copy of the Summary of Rights attached thereto,  shall also constitute
the transfer of the Rights associated with the Common Shares evidenced thereby.

     (c)  Certificates  for Common Shares which become  outstanding  (including,
without limitation, reacquired Common Shares referred to in the last sentence of
this paragraph (c)) after the Record Date but prior to the earliest of the Close
of  Business  on the  Distribution  Date,  the  Redemption  Date or the Close of
Business  on the Final  Expiration  Date shall have  impressed  on,  printed on,
written on or otherwise affixed to them the following legend:

          This  certificate  also  evidences  and entitles the holder  hereof to
     certain  Rights as set forth in a Rights  Agreement  between  Immunomedics,
     Inc. and American Stock Transfer & Trust Company, as Rights Agent, dated as
     of March 4, 2002,  as it may from time to time be  amended or  supplemented
     pursuant  to its terms  (the  "Rights  Agreement"),  the terms of which are
     hereby  incorporated  herein by reference and a copy of which is on file at
     the  principal  executive  offices  of  Immunomedics,  Inc.  Under  certain
     circumstances,  as set forth in the Rights  Agreement,  such Rights will be
     evidenced by separate  certificates and will no longer be evidenced by this
     certificate. Immunomedics, Inc. will mail to the holder of this certificate
     a copy of the Rights  Agreement  without  charge after receipt of a written
     request  therefor.  Under  certain  circumstances,  Rights that are or were
     acquired  or  beneficially  owned by  Acquiring  Persons (as defined in the
     Rights Agreement) may become null and void.

                                     - 5 -


With respect to such  certificates  containing the foregoing  legend,  until the
Close of Business  on the  Distribution  Date,  the Rights  associated  with the
Common  Shares   represented  by   certificates   shall  be  evidenced  by  such
certificates alone, and the surrender for transfer of any such certificate shall
also  constitute  the transfer of the Rights  associated  with the Common Shares
represented  thereby.  In the event that the Company  purchases  or acquires any
Common  Shares  after the Record  Date but prior to the Close of Business on the
Distribution Date, any Rights associated with such Common Shares shall be deemed
canceled  and retired so that the Company  shall not be entitled to exercise any
Rights  associated  with the  Common  Shares  which are no  longer  outstanding.

     Section 4. Form of Right Certificates.
                --------------------------

     The Right  Certificates  (and the forms of election  to purchase  Preferred
Shares  and of  assignment  to be  printed  on the  reverse  thereof)  shall  be
substantially  the  same  as  Exhibit  B  hereto  and may  have  such  marks  of
identification  or  designation  and such  legends,  summaries  or  endorsements
printed thereon as the Company may deem  appropriate and as are not inconsistent
with the provisions of this Agreement,  or as may be required to comply with any
applicable law or with any rule or regulation made pursuant  thereto or with any
rule or  regulation  of any stock  exchange on which the Rights may from time to
time be listed, or to conform to usage.  Subject to the other provisions of this
Agreement,  the Right Certificates shall entitle the holders thereof to purchase
such number of one  one-thousandths  of a Preferred  Share as shall be set forth
therein  at the  Purchase  Price,  but the  number of one  one-thousandths  of a
Preferred  Share and the  Purchase  Price  shall be  subject  to  adjustment  as
provided herein.

     Section 5. Countersignature and Registration.
                ---------------------------------

     The Right  Certificates  shall be  executed on behalf of the Company by its
Chairman of the Board, its Chief Executive  Officer,  its President,  any of its
Vice  Presidents or its Treasurer,  either  manually or by facsimile  signature,
shall have affixed thereto the Company's seal or a facsimile thereof,  and shall
be attested by the Secretary or any Assistant  Secretary of the Company,  either
manually  or  by  facsimile   signature.   The  Right   Certificates   shall  be
countersigned  by the Rights Agent and shall not be valid for any purpose unless
so  countersigned,  either manually or by facsimile.  In case any officer of the
Company  who shall have signed any of the Right  Certificates  shall cease to be
such  officer of the Company  before  countersignature  by the Rights  Agent and
issuance and delivery by the Company, such Right Certificates, nevertheless, may
be  countersigned  by the Rights  Agent and issued and  delivered by the Company
with the same  force and  effect as though  the  person  who  signed  such Right
Certificates  had not ceased to be such  officer of the  Company;  and any Right
Certificate  may be signed on behalf of the  Company by any person  who,  at the
actual  date of the  execution  of such  Right  Certificate,  shall  be a proper
officer of the Company to sign such Right  Certificate,  although at the date of
the execution of this Rights Agreement any such person was not such an officer.

                                     - 6 -



     Following the Distribution  Date, the Rights Agent will keep or cause to be
kept, at its principal  office,  books for  registration  of the transfer of the
Right  Certificates  issued  hereunder.  Such  books  shall  show the  names and
addresses of the  respective  holders of the Right  Certificates,  the number of
Rights  evidenced on its face by each of the Right  Certificates and the date of
each of the Right Certificates.

     Section 6. Transfer,   Split  Up,   Combination  and  Exchange  of
                Right Certificates; Mutilated, Destroyed, Lost or Stolen
                Right Certificates.
                --------------------------------------------------------

     Subject to the provisions of Section 14 hereof, at any time after the Close
of Business on the Distribution Date, and prior to the earlier of the Redemption
Date  or the  Close  of  Business  on  the  Final  Expiration  Date,  any  Right
Certificate or Right Certificates  (other than Right  Certificates  representing
Rights that have become void pursuant to Section  11(a)(ii)  hereof or that have
been  exchanged  pursuant  to Section 24 hereof) may be  transferred,  split up,
combined or  exchanged  for another  Right  Certificate  or Right  Certificates,
entitling the registered holder to purchase a like number of one one-thousandths
of a Preferred Share as the Right Certificate or Right Certificates  surrendered
then  entitles  such  holder to  purchase.  Any  registered  holder  desiring to
transfer,  split  up,  combine  or  exchange  any  Right  Certificate  or  Right
Certificates  shall make such request in writing  delivered to the Rights Agent,
and  shall  surrender  the  Right  Certificate  or  Right   Certificates  to  be
transferred,  split up,  combined or  exchanged at the  principal  office of the
Rights Agent.  Thereupon the Rights Agent shall  countersign  and deliver to the
person entitled thereto a Right Certificate or Right  Certificates,  as the case
may be, as so requested. The Company may require payment of a sum sufficient for
any tax or  governmental  charge  that may be  imposed  in  connection  with any
transfer,  split up,  combination  or exchange of Right  Certificates  from such
persons who receive such Right Certificates.

     Upon  receipt by the  Company and the Rights  Agent of evidence  reasonably
satisfactory  to them of the loss,  theft,  destruction or mutilation of a Right
Certificate,  and,  in case of  loss,  theft or  destruction,  of  indemnity  or
security  reasonably  satisfactory  to  them,  and,  at the  Company's  request,
reimbursement  to the Company and the Rights  Agent of all  reasonable  expenses
incidental  thereto,  and upon surrender to the Rights Agent and cancellation of
the Right  Certificate  if  mutilated,  the Company  will make and deliver a new
Right  Certificate  of like  tenor  to the  Rights  Agent  for  delivery  to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed or
mutilated.

     Section 7. Exercise of Rights;  Purchase Price;  Expiration Date of Rights.
                ---------------------------------------------------------------

     (a) The  registered  holder of any Right  Certificate  (other than a holder
whose Rights have become void pursuant to Section  11(a)(ii) hereof or have been
exchanged  pursuant  to Section 24 hereof)  may  exercise  the Rights  evidenced
thereby  in  whole or in part at any  time  after  the  Distribution  Date  upon
surrender of the Right Certificate, with the form of election to purchase on the
reverse side thereof duly executed, to the Rights Agent at its principal office,
together  with payment of the Purchase  Price for each one  one-thousandth  of a
Preferred  Share as to which the Rights are exercised,  prior to the earliest of
(i) the Close of Business on the Final  Expiration  Date, (ii) the time at which
the right to exercise the Rights  terminates  pursuant to Section 23 hereof,  or
(iii) the time at which the right to exercise the Rights terminates  pursuant to
Section 24 hereof.

                                     - 7 -


     (b) The purchase price for each one  one-thousandth of a Preferred Share to
be purchased  upon the exercise of a Right shall  initially be One Hundred Fifty
Dollars  ($150.00) (the "Purchase  Price"),  shall be subject to adjustment from
time to time as  provided  in  Sections 11 and 13 hereof and shall be payable in
lawful money of the United  States of America in accordance  with  paragraph (c)
below.

     (c) Upon receipt of a Right Certificate  representing  exercisable  Rights,
with the form of election to purchase and certificate duly executed, accompanied
by payment of the  Purchase  Price for the  number of one  one-thousandths  of a
Preferred  Share to be purchased and an amount equal to any applicable  transfer
tax required to be paid by the holder of such Right  Certificate  in  accordance
with Section 9 hereof by cash,  certified check,  cashier's check or money order
payable to the order of the Company,  the Rights Agent shall thereupon  promptly
(i) (A) requisition from any transfer agent of the Preferred Shares certificates
for the number of one  one-thousandths  of a Preferred Share to be purchased and
the Company hereby irrevocably  authorizes its transfer agent to comply with all
such requests,  or (B) requisition  from any depositary  agent for the Preferred
Shares depositary receipts  representing such number of one one-thousandths of a
Preferred  Share as are to be  purchased  (in which  case  certificates  for the
Preferred Shares represented by such receipts shall be deposited by the transfer
agent  with the  depositary  agent)  and the  Company  hereby  directs  any such
depositary agent to comply with such request, (ii) when appropriate, requisition
from the Company the amount of cash to be paid in lieu of issuance of fractional
Preferred  Shares in accordance  with Section 14 hereof,  (iii) after receipt of
such certificates or depositary  receipts,  cause the same to be delivered to or
upon the order of the registered holder of such Right Certificate, registered in
such  name  or  names  as may  be  designated  by  such  holder  and  (iv)  when
appropriate,  after  receipt,  deliver  such  cash to or upon  the  order of the
registered holder of such Right Certificate.

     (d) In case the registered  holder of any Right  Certificate shall exercise
less than all the Rights evidenced thereby,  a new Right Certificate  evidencing
Rights  equivalent to the Rights  remaining  unexercised  shall be issued by the
Rights Agent to the registered  holder of such Right  Certificate or to his duly
authorized assigns, subject to the provisions of Section 14 hereof.

     (e) Notwithstanding anything in this Agreement to the contrary, neither the
Rights Agent nor the Company  shall be  obligated  to undertake  any action with
respect to a registered holder upon the occurrence of any purported  exercise as
set  forth in this  Section  7 unless  such  registered  holder  shall  have (i)
completed and signed the certificate  following the form of election to purchase
set forth on the  reverse  side of the Right  Certificate  surrendered  for such
exercise  and (ii)  provided  such  additional  evidence of the  identity of the
Beneficial  Owner (or  former  Beneficial  Owner) or  Affiliates  or  Associates
thereof as the Company shall reasonably request.

                                     - 8 -



     Section 8. Cancellation and Destruction of Right Certificates.
                --------------------------------------------------

     All Right Certificates  surrendered for the purpose of exercise,  transfer,
split up, combination or exchange shall, if surrendered to the Company or to any
of its agents,  be delivered to the Rights Agent for cancellation or in canceled
form, or, if  surrendered  to the Rights Agent,  shall be canceled by it, and no
Right Certificates shall be issued in lieu thereof except as expressly permitted
by any of the provisions of this Rights Agreement.  The Company shall deliver to
the Rights Agent for cancellation and retirement,  and the Rights Agent shall so
cancel and retire,  any other  Right  Certificate  purchased  or acquired by the
Company otherwise than upon the exercise thereof. The Rights Agent shall deliver
all canceled Right Certificates to the Company, or shall, at the written request
of the Company, destroy such canceled Right Certificates, and in such case shall
deliver a certificate of destruction thereof to the Company.

     Section 9. Status and Availability of Preferred Shares.
                -------------------------------------------

     (a) The Company  covenants  and agrees that it will take all such action as
may be necessary to ensure that all Preferred  Shares delivered upon exercise of
Rights shall,  at the time of delivery of the  certificates  for such  Preferred
Shares  (subject to receipt by the Company of the Purchase  Price),  be duly and
validly authorized and issued and fully paid and non-assessable shares.

     (b) The Company further  covenants and agrees that it will pay when due and
payable any and all federal and state  transfer  taxes and charges  which may be
payable in respect of the issuance or delivery of the Right  Certificates  or of
any  Preferred  Shares  upon the  exercise  of Rights.  The  Company  shall not,
however,  be required to pay any transfer tax which may be payable in respect of
any transfer or delivery of Right  Certificates  to a Person other than,  or the
issuance or delivery of  certificates  or depositary  receipts for the Preferred
Shares  in a name  other  than  that of,  the  registered  holder  of the  Right
Certificate evidencing Rights surrendered for exercise or to issue or to deliver
any  certificates or depositary  receipts for Preferred Shares upon the exercise
of any  Rights  until  any such tax  shall  have  been  paid (any such tax being
payable by the holder of such Right  Certificate  at the time of  surrender)  or
until it has been established to the Company's  reasonable  satisfaction that no
such tax is due and payable.

     (c) The Company  covenants and agrees that it will cause to be reserved and
kept  available,  out of its  authorized  and unissued  Preferred  Shares or any
Preferred Shares held in its treasury,  the number of Preferred Shares that will
be  sufficient  to permit  the  exercise  in full of all  outstanding  Rights in
accordance with Section 7 hereof.

                                     - 9 -


     Section 10. Preferred Shares Record Date.
                 ----------------------------

     Each Person in whose name any  certificate  for Preferred  Shares is issued
upon the  exercise of Rights shall for all purposes be deemed to have become the
holder  of record of the  Preferred  Shares  represented  thereby  on,  and such
certificate shall be dated, the date upon which the Right Certificate evidencing
such  Rights was duly  surrendered  and payment of the  Purchase  Price (and any
applicable  transfer  taxes)  was  made.  Prior to the  exercise  of the  Rights
evidenced  thereby,  the holder of a Right  Certificate shall not be entitled to
any  rights of a holder of  Preferred  Shares  for  which  the  Rights  shall be
exercisable,  including,  without  limitation,  the  right to vote,  to  receive
dividends or other distributions or to exercise any preemptive rights, and shall
not be entitled to receive any notice of any proceedings of the Company,  except
as provided herein.


     Section 11.  Adjustment  of Purchase  Price,  Number of Shares or Number
                  of Rights.
                  -----------------------------------------------------------

     (a)      (i) In the event the  Company  shall at any time after the date of
     this  Agreement (A) declare a dividend on the Preferred  Shares  payable in
     Preferred  Shares,  (B) subdivide the  outstanding  Preferred  Shares,  (C)
     combine the outstanding Preferred Shares into a smaller number of Preferred
     Shares or (D) issue any shares of its capital  stock in a  reclassification
     of  the  Preferred  Shares  (including,   without   limitation,   any  such
     reclassification  in connection with a consolidation or merger in which the
     Company is the  continuing or surviving  corporation),  except as otherwise
     provided in this Section 11(a), the Purchase Price in effect at the time of
     the  record  date  for  such  dividend  or of the  effective  date  of such
     subdivision,  combination or  reclassification,  and the number and kind of
     shares of capital  stock  issuable on such date,  shall be  proportionately
     adjusted so that the holder of any Right exercised after such time shall be
     entitled  to  receive  the  aggregate  number and kind of shares of capital
     stock which,  if such Right had been  exercised  immediately  prior to such
     date,  such holder would have owned upon such exercise and been entitled to
     receive  by  virtue  of  such   dividend,   subdivision,   combination   or
     reclassification;   provided,   however,   that  in  no  event   shall  the
     consideration  to be paid upon the  exercise  of one Right be less than the
     aggregate par value of the shares of capital stock of the Company  issuable
     upon exercise of one Right.

          (ii) Subject to the following  paragraph of this subparagraph (ii) and
     to Section 24 of this  Agreement,  in the event any Person  shall become an
     Acquiring  Person,  each holder of a Right shall thereafter have a right to
     receive,  upon  exercise  thereof  at a price  equal  to the  then  current
     Purchase  Price  multiplied  by  the  number  of one  one-thousandths  of a
     Preferred Share for which a Right is then  exercisable,  in accordance with
     the terms of this Agreement and in lieu of Preferred Shares, such number of
     Common  Shares of the  Company as shall  equal the result  obtained  by (x)
     multiplying  the  then  current   Purchase  Price  by  the  number  of  one
     one-thousandths  of a Preferred Share for which a Right is then exercisable
     and  dividing  that product by (y) 50% of the then current per share market
     price of the Company's Common Shares (determined  pursuant to Section 11(d)
     hereof) on the date such Person  became an Acquiring  Person.  In the event
     that any Person shall become an Acquiring  Person and the Rights shall then
     be outstanding,  the Company shall not take any action that would eliminate
     or diminish the benefits intended to be afforded by the Rights.

                                     - 10 -


          From and after the occurrence of such an event, any Rights that are or
     were  acquired  or  beneficially  owned by such  Acquiring  Person  (or any
     Associate or Affiliate of such Acquiring Person) on or after the earlier of
     (x) the date of such event and (y) the Distribution  Date shall be void and
     any holder of such Rights shall  thereafter  have no right to exercise such
     Rights under any provision of this Agreement. No Right Certificate shall be
     issued pursuant to Section 3 that represents Rights  beneficially  owned by
     an Acquiring  Person whose Rights would be void  pursuant to the  preceding
     sentence or any Associate or Affiliate thereof;  no Right Certificate shall
     be issued  at any time  upon the  transfer  of any  Rights to an  Acquiring
     Person whose Rights would be void pursuant to the preceding sentence or any
     Associate or Affiliate  thereof or to any nominee of such Acquiring Person,
     Associate or Affiliate;  and any Right Certificate  delivered to the Rights
     Agent for  transfer  to an  Acquiring  Person  whose  Rights  would be void
     pursuant to the preceding  sentence or any  Associate or Affiliate  thereof
     shall be canceled.

          (iii)  In the  event  that the  number  of  Common  Shares  which  are
     authorized  by  the  Company's   Certificate  of   Incorporation   and  not
     outstanding  or  subscribed  for, or reserved or  otherwise  committed  for
     issuance  for  purposes  other than upon  exercise of the  Rights,  are not
     sufficient  to permit the holder of each  Right to  purchase  the number of
     Common  Shares to which such holder would be entitled  upon the exercise in
     full of the Rights in accordance  with the foregoing  subparagraph  (ii) of
     paragraph  (a) of this  Section  11, or should  the Board of  Directors  so
     elect,  the Company shall: (A) determine the excess of (1) the value of the
     Common Shares issuable upon the exercise of a Right (calculated as provided
     in the last  sentence  of this  subparagraph  (iii))  pursuant  to  Section
     11(a)(ii)  hereof (the "Current  Value") over (2) the Purchase  Price (such
     excess,  the "Spread"),  and (B) with respect to each Right,  make adequate
     provision  to  substitute  for such  Common  Shares,  upon  payment  of the
     applicable  Purchase  Price,  any one or more of the  following  having  an
     aggregate  value  determined  by the Board of  Directors to be equal to the
     Current Value:  (1) cash, (2) a reduction in the Purchase Price, (3) Common
     Shares  or other  equity  securities  of the  Company  (including,  without
     limitation,  shares, or units of shares, of preferred stock which the Board
     of  Directors  of the  Company has  determined  in good faith to have equal
     value as Common  Shares  (such  shares of preferred  stock,  "Common  Share
     Equivalents")),  (4) debt  securities of the Company,  or (5) other assets;
     provided, however, if the Company shall not have made adequate provision to
     deliver  value  pursuant  to  clause  (B)  above  within  thirty  (30) days
     following  the  first  occurrence  of an event  triggering  the  rights  to
     purchase  Common  Shares  described  in  Section  11(a)(ii)  (the  "Section
     11(a)(ii)  Trigger Date"),  then the Company shall be obligated to deliver,
     upon the surrender for exercise of a Right and without requiring payment of
     the  Purchase  Price,  Common  Shares  (to  the  extent  available)  and in
     addition,  if  necessary,  cash,  which  Common  Shares  and  cash  have an
     aggregate  value  equal to the  Spread.  If the Board of  Directors  of the
     Company  shall  determine  in good faith that it is likely that  sufficient
     additional  Common Shares could be authorized for issuance upon exercise in
     full of the  Rights,  the thirty  (30) day  period  set forth  above may be
     extended to the extent reasonably necessary,  but not more than ninety (90)
     days after the Section  11(a)(ii)  Trigger  Date, in order that the Company
     may seek  stockholder  approval for the  authorization  of such  additional
     shares (such period, as it may be extended, the "Substitution  Period"). To
     the extent  that the  Company  determines  that some  action  need be taken
     pursuant to the first and/or second  sentences of this Section  11(a)(iii),
     the Company (x) shall provide,  subject to Section 7(e) hereof and the last
     paragraph  of  Section  11(a)(ii)  hereof,  that such  action  shall  apply

                                     - 11 -



     uniformly to all outstanding Rights, and (y) may suspend the exercisability
     of the Rights until the expiration of the  Substitution  Period in order to
     seek any  authorization  of  additional  Common Shares and/or to decide the
     appropriate form of distribution to be made pursuant to such first sentence
     and to determine the value  thereof.  In the event of any such  suspension,
     the  Company  shall make a public  announcement,  and shall  deliver to the
     Rights Agent a statement, stating that the exercisability of the Rights has
     been temporarily  suspended in accordance with this Section 11(a)(iii).  At
     such time as the suspension is no longer in effect,  the Company shall make
     another public  announcement,  and deliver to the Rights Agent a statement,
     so stating.  For  purposes  of this  Section  11(a)(iii),  the value of the
     Common  Shares shall be the current per share  market price (as  determined
     pursuant to Section  11(d)(i)  hereof) of the Common  Shares on the Section
     11(a)(ii)  Trigger Date and the value of any Common Shares Equivalent shall
     be deemed to have an equal value as the Common Shares on such date.

     (b) In case the Company shall fix a record date for the issuance of rights,
options or warrants to all holders of  Preferred  Shares  entitling  them (for a
period expiring within 45 calendar days after such record date) to subscribe for
or purchase  Preferred Shares (or shares having the same rights,  privileges and
preferences  as  the  Preferred  Shares  ("Equivalent   Preferred  Shares"))  or
securities convertible into Preferred Shares or Equivalent Preferred Shares at a
price per Preferred Share or Equivalent  Preferred Share (or having a conversion
price per share, if a security  convertible  into Preferred Shares or Equivalent
Preferred  Shares)  less than the then  current  per share  market  price of the
Preferred Shares (as defined in Section 11(d)) on such record date, the Purchase
Price to be in effect  after such record  date shall be adjusted by  multiplying
the  Purchase  Price  in  effect  immediately  prior  to such  record  date by a
fraction,  the  numerator  of which  shall be the  number  of  Preferred  Shares
outstanding  on such record date plus the number of  Preferred  Shares which the
aggregate  offering  price  of the  total  number  of  Preferred  Shares  and/or
Equivalent  Preferred  Shares so to be offered  (and/or  the  aggregate  initial
conversion price of the convertible  securities so to be offered) would purchase
at such current market price and the denominator of which shall be the number of
Preferred  Shares  outstanding on such record date plus the number of additional
Preferred  Shares  and/or   Equivalent   Preferred  Shares  to  be  offered  for
subscription  or purchase  (or into which the  convertible  securities  so to be
offered are initially  convertible);  provided,  however, that in no event shall
the  consideration  to be paid upon the  exercise  of one Right be less than the
aggregate par value of the shares of capital stock of the Company  issuable upon
exercise  of one  Right.  In  case  such  subscription  price  may be  paid in a
consideration part or all of which shall be in a form other than cash, the value
of such  consideration  shall be as  determined  in good  faith by the  Board of
Directors of the Company,  whose determination shall be described in a statement
filed with the Rights Agent.  Preferred  Shares owned by or held for the account
of the  Company  shall not be deemed  outstanding  for the  purpose  of any such
computation.  Such adjustment shall be made successively  whenever such a record
date is fixed; and in the event that such rights, options or warrants are not so
issued,  the  Purchase  Price shall be adjusted to be the  Purchase  Price which
would then be in effect if such record date had not been fixed.

     (c) In case the  Company  shall  fix a  record  date  for the  making  of a
distribution  to  all  holders  of  the  Preferred  Shares  (including,  without
limitation,  any distribution  made in connection with a consolidation or merger
in which the Company is the continuing or surviving corporation) of evidences of
indebtedness  or assets  (other  than a regular  quarterly  cash  dividend  or a

                                     - 12 -


dividend  payable  in  Preferred  Shares)  or  subscription  rights or  warrants
(excluding those referred to in Section 11(b) hereof),  the Purchase Price to be
in effect after such record date shall be determined by multiplying the Purchase
Price  in  effect  immediately  prior to such  record  date by a  fraction,  the
numerator  of which  shall be the then  current  per share  market  price of the
Preferred  Shares on such record date, less the fair market value (as determined
in good faith by the Board of  Directors  of the  Company,  whose  determination
shall be described in a statement filed with the Rights Agent) of the portion of
the  assets  or  evidences  of  indebtedness  so to be  distributed  or of  such
subscription  rights  or  warrants  applicable  to one  Preferred  Share and the
denominator  of which  shall  be such  current  per  share  market  price of the
Preferred Shares; provided, however, that in no event shall the consideration to
be paid upon the exercise of one Right be less than the  aggregate  par value of
the shares of capital  stock of the  Company to be issued  upon  exercise of one
Right. Such adjustments  shall be made successively  whenever such a record date
is fixed;  and in the event that such  distribution is not so made, the Purchase
Price shall again be  adjusted to be the  Purchase  Price which would then be in
effect if such record date had not been fixed.

     (d)      (i) For the purpose of any computation hereunder, the "current per
     share market price" of any security (a  "security"  for the purpose of this
     Section  11(d)(i))  on any date  shall be deemed to be the  average  of the
     daily  last  reported  sale  price  per share of such  security  for the 30
     consecutive Trading Days (as such term is hereinafter  defined) immediately
     prior to such date; provided,  however,  that in the event that the current
     per share  market  price of such  security  is  determined  during a period
     following the announcement by the issuer of such security of (A) a dividend
     or  distribution  on such  security  payable in shares of such  security or
     securities   convertible   into  such  shares,   or  (B)  any  subdivision,
     combination  or   reclassification  of  such  security  and  prior  to  the
     expiration of 30 Trading Days after the ex-dividend  date for such dividend
     or distribution,  or the record date for such  subdivision,  combination or
     reclassification, then, and in each such case, the current per share market
     price shall be  appropriately  adjusted to reflect the current market price
     per share equivalent of such security. The closing price for each day shall
     be the last sale price,  regular  way, or, in case no such sale takes place
     on such day, the average of the closing bid and asked prices,  regular way,
     in  either  case as  reported  in the  principal  consolidated  transaction
     reporting  system with respect to securities  listed or admitted to trading
     on the New York  Stock  Exchange  or,  if the  security  is not  listed  or
     admitted  to trading on the New York Stock  Exchange,  as  reported  in the
     principal  consolidated   transaction  reporting  system  with  respect  to
     securities listed on the principal  national  securities  exchange on which
     the  security is listed or  admitted to trading or, if the  security is not
     listed or admitted to trading on any national securities exchange, the last
     quoted  price or, if not so  quoted,  the  average  of the high bid and low
     asked prices in the  over-the-counter  market,  as reported by the National
     Association  of  Securities  Dealers,   Inc.  Automated  Quotations  System
     ("Nasdaq")  or such other  system then in use,  or, if on any such date the
     security is not quoted by any such organization, the average of the closing
     bid and asked prices as furnished by a  professional  market maker making a
     market in the security selected by the Board of Directors of the Company in
     good faith.  The term "Trading Day" shall mean a day on which the principal
     national securities exchange on which the security is listed or admitted to
     trading is open for the  transaction of business or, if the security is not
     listed or  admitted  to  trading on any  national  securities  exchange,  a
     Business Day.

                                     - 13 -


          (ii) For the purpose of any  computation  hereunder,  the "current per
     share  market  price"  of the  Preferred  Shares  shall  be  determined  in
     accordance with the method set forth in Section 11(d)(i).  If the Preferred
     Shares are not publicly traded, the "current per share market price" of the
     Preferred  Shares shall be conclusively  deemed to be the current per share
     market  price of the  Common  Shares  as  determined  pursuant  to  Section
     11(d)(i) (appropriately adjusted to reflect any stock split, stock dividend
     or similar  transaction  occurring  after the date  hereof),  multiplied by
     1000. If neither the Common  Shares nor the  Preferred  Shares are publicly
     held or so listed or traded,  "current per share  market  price" shall mean
     the fair market value per share as determined in good faith by the Board of
     Directors  of the  Company,  whose  determination  shall be  described in a
     statement filed with the Rights Agent.

     (e) No  adjustment  in the  Purchase  Price shall be  required  unless such
adjustment  would require an increase or decrease of at least 1% in the Purchase
Price;  provided,  however, that any adjustments which by reason of this Section
11(e) are not  required  to be made  shall be  carried  forward  and taken  into
account in any subsequent  adjustment.  All  calculations  under this Section 11
shall be made to the  nearest  cent or to the  nearest  one  ten-millionth  of a
Preferred Share or one ten-thousandth of any other share or security as the case
may be. Notwithstanding the first sentence of this Section 11(e), any adjustment
required  by this  Section 11 shall be made no later  than three  years from the
date of the transaction which requires such adjustment.

     (f) If as a result of an adjustment  made pursuant to Section 11(a) hereof,
the holder of any Right  thereafter  exercised  shall become entitled to receive
any shares of capital  stock of the Company  other than  Preferred  Shares,  the
number of such other  shares so  receivable  upon  exercise  of any Right  shall
thereafter be subject to  adjustment  from time to time in a manner and on terms
as nearly  equivalent  as  practicable  to the  provisions  with  respect to the
Preferred  Shares  contained in Section  11(a) through (c),  inclusive,  and the
provisions  of Sections  7, 9, 10 and 13 with  respect to the  Preferred  Shares
shall apply on like terms to any such other shares.

     (g)  All  Rights  originally  issued  by  the  Company  subsequent  to  any
adjustment  made to the Purchase  Price  hereunder  shall  evidence the right to
purchase, at the adjusted Purchase Price, the number of one one-thousandths of a
Preferred  Share  purchasable  from time to time  hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

     (h) Unless the Company  shall have  exercised  its  election as provided in
Section  11(i),  upon each  adjustment of the Purchase  Price as a result of the
calculations made in Sections 11(b) and (c), each Right outstanding  immediately
prior to the making of such adjustment  shall  thereafter  evidence the right to
purchase,  at the adjusted Purchase Price, that number of one one-thousandths of
a Preferred Share  (calculated to the nearest one  ten-millionth  of a Preferred
Share) obtained by (i) multiplying  (x) the number of one  one-thousandths  of a
share  covered  by a  Right  immediately  prior  to this  adjustment  by (y) the
Purchase Price in effect  immediately  prior to such  adjustment of the Purchase
Price and (ii) dividing the product so obtained by the Purchase  Price in effect
immediately after such adjustment of the Purchase Price.

                                     - 14 -


     (i) The  Company  may elect on or after the date of any  adjustment  of the
Purchase Price to adjust the number of Rights in substitution for any adjustment
in the number of one  one-thousandths  of a Preferred Share purchasable upon the
exercise of a Right. Each of the Rights outstanding after such adjustment of the
number of Rights shall be exercisable for the number of one one-thousandths of a
Preferred  Share  for which a Right was  exercisable  immediately  prior to such
adjustment.  Each Right held of record prior to such adjustment of the number of
Rights  shall  become  that  number of Rights  (calculated  to the  nearest  one
hundred-thousandth)   obtained  by  dividing  the   Purchase   Price  in  effect
immediately  prior to adjustment of the Purchase  Price by the Purchase Price in
effect  immediately  after  adjustment of the Purchase Price.  The Company shall
make a public  announcement  of its  election  to adjust  the  number of Rights,
indicating  the record date for the  adjustment,  and, if known at the time, the
amount of the  adjustment to be made.  This record date may be the date on which
the  Purchase  Price  is  adjusted  or any day  thereafter,  but,  if the  Right
Certificates  have been  distributed,  shall be at least 10 days  later than the
date of the public  announcement.  If Right  Certificates have been distributed,
upon each adjustment of the number of Rights pursuant to this Section 11(i), the
Company shall, as promptly as practicable, cause to be distributed to holders of
record of Right Certificates on such record date Right Certificates  evidencing,
subject to Section 14 hereof,  the additional Rights to which such holders shall
be entitled as a result of such  adjustment,  or, at the option of the  Company,
shall cause to be  distributed  to such  holders of record in  substitution  and
replacement for the Right Certificates held by such holders prior to the date of
adjustment,  and upon surrender thereof,  if required by the Company,  new Right
Certificates  evidencing  all the Rights to which such holders shall be entitled
after such adjustment.  Right Certificates to be so distributed shall be issued,
executed  and  countersigned  in the  manner  provided  for  herein and shall be
registered  in the names of the holders of record of Right  Certificates  on the
record date specified in the public announcement.

     (j)  Irrespective  of any adjustment or change in the Purchase Price or the
number of one one-thousandths of a Preferred Share issuable upon the exercise of
the  Rights,  the Right  Certificates  theretofore  and  thereafter  issued  may
continue to express the Purchase Price and the number of one  one-thousandths of
a Preferred Share which were expressed in the initial Right Certificates  issued
hereunder.

     (k) Before  taking any action that would cause an  adjustment  reducing the
Purchase Price below one  one-thousandth  of the then par value of the Preferred
Shares issuable upon exercise of the Rights, the Company shall promptly take any
corporate action which may, in the opinion of its counsel, be necessary in order
that the Company may  validly  and legally  issue fully paid and  non-assessable
Preferred Shares at such adjusted Purchase Price.

     (l) In any case in which this Section 11 shall  require that an  adjustment
in the  Purchase  Price be made  effective  as of a record  date for a specified
event,  the Company may elect to defer  until the  occurrence  of such event the
issuing  to the holder of any Right  exercised  after  such  record  date of the
Preferred  Shares and other capital stock or securities of the Company,  if any,
issuable  upon  such  exercise  over and above the  Preferred  Shares  and other
capital stock or securities of the Company,  if any, issuable upon such exercise
on the basis of the Purchase Price in effect prior to such adjustment; provided,
however,  that the  Company  shall  deliver  to such  holder a due bill or other
appropriate instrument evidencing such holder's right to receive such additional
shares upon the occurrence of the event requiring such adjustment.

                                     - 15 -


     (m)  Notwithstanding  anything  in this  Section  11 to the  contrary,  the
Company  shall be entitled to make such  reductions  in the Purchase  Price,  in
addition to those adjustments  expressly  required by this Section 11, as and to
the extent that the  Company,  in its sole  discretion,  shall  determine  to be
advisable in order that any (i)  combination  or  subdivision  of the  Preferred
Shares,  (ii) issuance wholly for cash of any Preferred  Shares at less than the
current  market price,  (iii)  issuance  wholly for cash of Preferred  Shares or
securities  which  by their  terms  are  convertible  into or  exchangeable  for
Preferred Shares, (iv) dividends on Preferred Shares payable in Preferred Shares
or (v) issuance of any rights,  options or warrants  referred to  hereinabove in
Section 11(b),  hereafter made by the Company to holders of its Preferred Shares
shall not be taxable to such stockholders.

     (n) In the  event  that at any time  after the date of this  Agreement  and
prior to the  Distribution  Date,  the  Company  shall  (i)  declare  or pay any
dividend  on the  Common  Shares  payable  in  Common  Shares  or (ii)  effect a
subdivision,   combination   or   consolidation   of  the   Common   Shares  (by
reclassification  or  otherwise  other than by payment  of  dividends  in Common
Shares) into a greater or lesser number of Common Shares,  then in any such case
(i) the number of one  one-thousandths  of a Preferred Share  purchasable  after
such event upon proper exercise of each Right shall be determined by multiplying
the  number  of  one   one-thousandths  of  a  Preferred  Share  so  purchasable
immediately  prior to such event by a fraction,  the  numerator  of which is the
number  of Common  Shares  outstanding  immediately  before  such  event and the
denominator  of which is the  number of Common  Shares  outstanding  immediately
after such event, and (ii) each Common Share outstanding  immediately after such
event  shall have issued  with  respect to it that  number of Rights  which each
Common Share outstanding immediately prior to such event had issued with respect
to it.  The  adjustments  provided  for in  this  Section  11(n)  shall  be made
successively whenever such a dividend is declared or paid or such a subdivision,
combination or consolidation is effected.


     Section 12. Certificate of Adjustment.
                 -------------------------

     Whenever  an  adjustment  is made as provided in Sections 11 and 13 hereof,
the  Company  shall  promptly  (a)  prepare a  certificate  setting  forth  such
adjustment,  and a brief statement of the facts  accounting for such adjustment,
(b) file  with the  Rights  Agent and with each  transfer  agent for the  Common
Shares  or the  Preferred  Shares  a copy  of such  certificate  and (c) if such
adjustment occurs following a Distribution Date, mail a brief summary thereof to
each record holder of a Right  Certificate in accordance with Section 25 hereof.
The Rights Agent shall be fully protected in relying on any such certificate and
on any  adjustment  therein  contained and shall not be obligated or responsible
for  calculating any adjustment nor shall it be deemed to have knowledge of such
an adjustment unless and until it shall have received such certificate.

                                     - 16 -



     Section  13. Consolidation, Merger or Sale or Transfer of Assets.
                  ---------------------------------------------------

     In the event that, at any time after a Person becomes an Acquiring  Person,
directly or indirectly,  (i) the Company shall  consolidate  with, or merge with
and into, any other Person,  (ii) any Person shall consolidate with the Company,
or merge with and into the Company and the Company  shall be the  continuing  or
surviving corporation of such merger and, in connection with such merger, all or
part of the Common  Shares shall be changed into or exchanged for stock or other
securities  of any other Person (or the Company) or cash or any other  property,
or (iii) the Company  shall sell or  otherwise  transfer  (or one or more of its
Subsidiaries  shall sell or otherwise  transfer),  in one or more  transactions,
assets or earning power  aggregating  50% or more of the assets or earning power
of the Company and its Subsidiaries (taken as a whole) to any other Person other
than the Company or one or more of its wholly owned  Subsidiaries,  then, and in
each such  case,  proper  provision  shall be made so that (A) each  holder of a
Right (except as otherwise  provided  herein) shall thereafter have the right to
receive, upon the exercise thereof at a price equal to the then current Purchase
Price multiplied by the number of one  one-thousandths  of a Preferred Share for
which  a Right  is then  exercisable,  in  accordance  with  the  terms  of this
Agreement and in lieu of Preferred Shares,  such number of Common Shares of such
other Person  (including  the Company as successor  thereto or as the  surviving
corporation)  as shall  equal the result  obtained by (x)  multiplying  the then
current Purchase Price by the number of one one-thousandths of a Preferred Share
for which a Right is then  exercisable  and dividing  that product by (y) 50% of
the then  current  per share  market  price of the  Common  Shares of such other
Person (determined pursuant to Section 11(d) hereof) on the date of consummation
of such consolidation,  merger, sale or transfer;  (B) the issuer of such Common
Shares  shall  thereafter  be liable for,  and shall  assume,  by virtue of such
consolidation,  merger, sale or transfer,  all the obligations and duties of the
Company  pursuant to this Agreement;  (C) the term "Company" shall thereafter be
deemed to refer to such  issuer;  and (D) such  issuer  shall  take  such  steps
(including,  without  limitation,  the reservation of a sufficient number of its
Common  Shares in  accordance  with  Section 9 hereof) in  connection  with such
consummation  as may be  necessary  to assure that the  provisions  hereof shall
thereafter be  applicable,  as nearly as  reasonably  may be, in relation to the
Common  Shares  thereafter  deliverable  upon the  exercise of the  Rights.  The
Company   covenants   and  agrees  that  it  shall  not   consummate   any  such
consolidation,  merger,  sale or transfer  unless prior  thereto the Company and
such issuer shall have executed and delivered to the Rights Agent a supplemental
agreement so obligating the issuer to become a party thereto.  The Company shall
not enter into any  transaction of the kind referred to in this Section 13 if at
the time of such  transaction  there are any rights,  warrants,  instruments  or
securities  outstanding or any agreements or arrangements  which, as a result of
the  consummation  of such  transaction,  would  eliminate  or  diminish  in any
material  respect the  benefits  intended  to be  afforded  by the  Rights.  The
provisions of this Section 13 shall  similarly  apply to  successive  mergers or
consolidations or sales or other transfers.

     Section 14. Fractional Rights and Fractional Shares.
                 ---------------------------------------

     (a) The Company  shall not be required to issue  fractions  of Rights or to
distribute Right Certificates which evidence  fractional Rights. In lieu of such
fractional  Rights,  there shall be paid to the registered  holders of the Right
Certificates  with regard to which such  fractional  Rights  would  otherwise be

                                     - 17 -



issuable,  an amount in cash equal to the same  fraction of the  current  market
value of a whole  Right.  For the purposes of this  Section  14(a),  the current
market  value of a whole Right shall be the closing  price of the Rights for the
Trading Day immediately  prior to the date on which such fractional Rights would
have been  otherwise  issuable.  The closing price for any day shall be the last
sale price,  regular  way, or, in case no such sale takes place on such day, the
average of the  closing  bid and asked  prices,  regular  way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities  listed or admitted to trading on the New York Stock  Exchange or,
if the  Rights  are not  listed or  admitted  to  trading  on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national  securities exchange
on which the Rights are listed or  admitted to trading or, if the Rights are not
listed or  admitted to trading on any  national  securities  exchange,  the last
quoted  price or, if not so  quoted,  the  average of the high bid and low asked
prices in the  over-the-counter  market,  as  reported  by Nasdaq or such  other
system then in use or, if on any such date the Rights are not quoted by any such
organization,  the average of the closing bid and asked prices as furnished by a
professional  market maker making a market in the Rights  selected in good faith
by the Board of  Directors  of the  Company.  If on any such date no such market
maker is making a market in the Rights,  the fair market  value of the Rights on
such date as  determined  in good faith by the Board of Directors of the Company
shall be conclusive.

     (b) The  Company  shall not be  required to issue  fractions  of  Preferred
Shares (other than fractions which are integral  multiples of one one-thousandth
of a Preferred Share) upon exercise of the Rights or to distribute  certificates
which  evidence  fractional  Preferred  Shares (other than  fractions  which are
integral  multiples of one  one-thousandth of a Preferred  Share).  Fractions of
Preferred  Shares in integral  multiples  of one  one-thousandth  of a Preferred
Share may, at the election of the Company, be evidenced by depositary  receipts,
pursuant to an  appropriate  agreement  between  the  Company  and a  depositary
selected by it;  provided,  however,  that such agreement shall provide that the
holders of such  depositary  receipts shall have all the rights,  privileges and
preferences  to which they are entitled as  beneficial  owners of the  Preferred
Shares represented by such depositary receipts.  In lieu of fractional Preferred
Shares that are not  integral  multiples  of one  one-thousandth  of a Preferred
Share, the Company may, in its sole discretion, pay to each registered holder of
Right  Certificates  at the time such Rights are exercised as herein provided an
amount in cash equal to the same  fraction  of the current  market  value of one
Preferred  Share as the fraction of one  Preferred  Share that such holder would
otherwise  receive upon the exercise of the aggregate number of rights exercised
by such holder. For the purposes of this Section 14(b), the current market value
of a  Preferred  Share  shall be the  closing  price of a  Preferred  Share  (as
determined  pursuant to the second sentence of Section  11(d)(i) hereof) for the
Trading Day immediately prior to the date of such exercise.

     (c) The holder of a Right by the acceptance of the Right  expressly  waives
any right to receive  fractional  Rights or fractional shares upon exercise of a
Right (except as provided above).

     Section 15. Rights of Action.
                 ----------------

     All rights of action in respect of this Agreement,  excepting the rights of
action  given to the Rights  Agent  under  Section 18 hereof,  are vested in the
respective  registered  holders  of the Right  Certificates  (and,  prior to the
Distribution  Date,  the  registered  holders  of the  Common  Shares);  and any
registered holder of any Right Certificate (or, prior to the Distribution  Date,
of the Common  Shares)  may,  without the consent of the Rights  Agent or of the

                                     - 18 -


holder of any other Right  Certificate (or, prior to the  Distribution  Date, of
the Common  Shares),  on such  holder's  own behalf  and for such  holder's  own
benefit,  enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce,  or otherwise  act in respect of, such  holder's
right to exercise the Rights  evidenced by such Right  Certificate in the manner
provided in such Right  Certificate and in this Agreement.  Without limiting the
foregoing or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this Agreement and are entitled to specific performance of the
obligations under, and injunctive relief against actual or threatened violations
of the obligations of any Person subject to, this Agreement.

     Section 16. Agreement of Right Holders.
                 --------------------------

     Every holder of a Right,  by accepting  the same,  consents and agrees with
the Company and the Rights Agent and with every other holder of a Right that:

     (a) prior to the Distribution Date, the Rights will be transferable only in
connection with the transfer of the Common Shares;

     (b) after the  Distribution  Date, the Right  Certificates are transferable
only on the registry books  maintained by the Rights Agent if surrendered at the
principal  office of the Rights Agent,  duly endorsed or accompanied by a proper
instrument of transfer with a completed form of certification; and

     (c) the Company and the Rights Agent may deem and treat the Person in whose
name the Right  Certificate (or, prior to the Distribution  Date, the associated
Common Shares  certificate)  is registered as the absolute  owner thereof and of
the Rights  evidenced  thereby  (notwithstanding  any  notations of ownership or
writing on the Right  Certificates or the associated  Common Shares  certificate
made by anyone  other than the  Company or the  Rights  Agent) for all  purposes
whatsoever,  and neither  the Company nor the Rights  Agent shall be affected by
any notice to the contrary.

     Section 17. Right Certificate Holder Not Deemed a Stockholder.
                 -------------------------------------------------

     No holder,  as such,  of any Right  Certificate  shall be entitled to vote,
receive dividends or be deemed for any purpose the holder of Preferred Shares or
any other  securities  of the  Company  which may at any time be issuable on the
exercise of the Rights  represented  thereby nor shall anything contained herein
or in any Right  Certificate be construed to confer upon the holder of any Right
Certificate,  as such,  any of the rights of a stockholder of the Company or any
right to vote for the  election of  directors  or upon any matter  submitted  to
stockholders  at any  meeting  thereof,  or to give or  withhold  consent to any
corporate  action,  or to receive notice of meetings or other actions  affecting
stockholders  (except as provided in Section 25 hereof), or to receive dividends
or subscription  rights,  or otherwise,  until the Right or Rights  evidenced by
such  Right  Certificate  shall  have  been  exercised  in  accordance  with the
provisions hereof.

                                     - 19 -


     Section 18. Concerning the Rights Agent.
                 ---------------------------

     The Company agrees to pay to the Rights Agent  reasonable  compensation for
all services  rendered by it hereunder  and, from time to time, on demand of the
Rights Agent, its reasonable  expenses and counsel fees and other  disbursements
incurred in the  administration and execution of this Agreement and the exercise
and  performance of its duties  hereunder.  The Company also agrees to indemnify
the Rights Agent for, and to hold it harmless against, any loss,  liability,  or
expense,  incurred without  negligence,  bad faith or willful  misconduct on the
part of the Rights  Agent,  for anything  done or omitted by the Rights Agent in
connection with the acceptance and  administration of this Agreement,  including
the costs and expenses of defending against any claim or liability in connection
therewith.   The  indemnification  provided  for  hereunder  shall  survive  the
expiration of the Rights and the  termination of this  Agreement.  The costs and
expenses of enforcing  this right of  indemnification  shall also be paid by the
Company.

     The Rights  Agent may  conclusively  rely upon and shall be  protected  and
shall  incur no  liability  for or in respect of any action  taken,  suffered or
omitted  by it in  connection  with  its  administration  of this  Agreement  in
reliance upon any Right  Certificate or certificate for Preferred  Shares or for
other securities of the Company,  instrument of assignment or transfer, power of
attorney,   endorsement,   affidavit,   letter,  notice,   direction,   consent,
certificate,  statement, or other paper or document reasonably believed by it to
be  genuine  and to be  signed,  executed  and,  where  necessary,  verified  or
acknowledged, by the proper person or persons.  Notwithstanding anything in this
Agreement  to the  contrary,  in no event  shall the Rights  Agent be liable for
special,  indirect  or  consequential  loss or  damage  of any  kind  whatsoever
(including, without limitation, lost profits), even if the Rights Agent has been
advised of the  likelihood of such loss or damage and  regardless of the form of
the action.

     Section 19. Merger or Consolidation or Change of Name of Rights Agent.
                 ---------------------------------------------------------

     Any corporation  into which the Rights Agent or any successor  Rights Agent
may be merged or with which it may be consolidated, or any corporation resulting
from any  merger or  consolidation  to which the Rights  Agent or any  successor
Rights Agent shall be a party,  or any  corporation  succeeding to the corporate
trust business of the Rights Agent or any successor  Rights Agent,  shall be the
successor  to the Rights  Agent under this  Agreement  without the  execution or
filing of any paper or any further act on the part of any of the parties hereto,
provided that such corporation  would be eligible for appointment as a successor
Rights Agent under the provisions of Section 21 hereof. In case at the time such
successor  Rights Agent shall succeed to the agency  created by this  Agreement,
any of the Right  Certificates  shall have been countersigned but not delivered,
any  such  successor  Rights  Agent  may  adopt  the   countersignature  of  the
predecessor  Rights Agent and deliver such Right  Certificates so countersigned;
and in case at that  time any of the  Right  Certificates  shall  not have  been
countersigned,   any  successor   Rights  Agent  may   countersign   such  Right
Certificates  either in the name of the predecessor  Rights Agent or in the name
of the  successor  Rights Agent;  and in all such cases such Right  Certificates
shall  have  the full  force  provided  in the  Right  Certificates  and in this
Agreement.

     In case at any time the name of the Rights  Agent  shall be changed  and at
such time any of the Right  Certificates  shall have been  countersigned but not
delivered,  the Rights Agent may adopt the countersignature under its prior name
and deliver Right Certificates so countersigned; and in case at that time any of
the Right Certificates shall not have been  countersigned,  the Rights Agent may
countersign such Right  Certificates  either in its prior name or in its changed
name;  and in all such cases such Right  Certificates  shall have the full force
provided in the Right Certificates and in this Agreement.

                                     - 20 -


     Section 20. Duties of Rights Agent.
                 ----------------------

     The Rights Agent undertakes the duties and obligations  expressly set forth
in this Agreement and no implied  duties or obligations  shall be read into this
Agreement  against the Rights Agent. The Rights Agent shall perform those duties
and obligations  upon the following  terms and  conditions,  by all of which the
Company  and the holders of Right  Certificates,  by their  acceptance  thereof,
shall be bound:

     (a) Before the Rights Agent acts or refrains  from  acting,  it may consult
with legal counsel (who may be legal  counsel for the Company),  and the opinion
of such counsel shall be full and complete  authorization  and protection to the
Rights  Agent as to any  action  taken or  omitted  by it in good  faith  and in
reliance upon such opinion.

     (b)  Whenever in the  performance  of its duties under this  Agreement  the
Rights Agent shall deem it  necessary  or  desirable  that any fact or matter be
proved or  established  by the Company  prior to taking or suffering  any action
hereunder,  such fact or matter  (unless  other  evidence in respect  thereof be
herein  specifically  prescribed)  may be deemed to be  conclusively  proved and
established  by a  certificate  signed  by  any  one of  the  President,  a Vice
President,  the  Treasurer or the  Secretary of the Company and delivered to the
Rights Agent;  and such  certificate  shall be full  authorization to the Rights
Agent for any action taken or suffered in good faith by it under the  provisions
of this Agreement in reliance upon such certificate.

     (c) The Rights Agent shall be liable hereunder only for its own negligence,
bad faith or willful misconduct.

     (d) The  Rights  Agent  shall not be liable  for or by reason of any of the
statements  of fact or  recitals  contained  in this  Agreement  or in the Right
Certificates  (except as to its  countersignature  thereof)  or be  required  to
verify the same, but all such statements and recitals are and shall be deemed to
have been made by the Company only.

     (e) The Rights  Agent shall not be under any  responsibility  in respect of
the validity of this Agreement or the execution and delivery  hereof (except the
due  execution  hereof by the Rights  Agent) or in respect  of the  validity  or
execution of any Right Certificate (except its  countersignature  thereof);  nor
shall it be  responsible  for any  breach  by the  Company  of any  covenant  or
condition contained in this Agreement or in any Right Certificate;  nor shall it
be responsible  for any adjustment  required under the provisions of Sections 11
or 13  hereof  or  responsible  for the  manner,  method  or  amount of any such
adjustment or the  ascertaining of the existence of facts that would require any
such  adjustment  (except with  respect to the  exercise of Rights  evidenced by
Right Certificates after actual notice of any such adjustment);  nor shall it by
any act  hereunder  be deemed to make any  representation  or warranty as to the
authorization  or  reservation  of any shares of  Preferred  Shares to be issued
pursuant  to this  Agreement  or any  Right  Certificate  or as to  whether  any
Preferred Shares will, when so issued, be validly  authorized and issued,  fully
paid and nonassessable.

                                     - 21 -


     (f) The  Company  agrees that it will  perform,  execute,  acknowledge  and
deliver or cause to be performed, executed,  acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying  out or  performing  by the Rights Agent of
the provisions of this Agreement.

     (g)  The  Rights  Agent  is  hereby   authorized  and  directed  to  accept
instructions  with respect to the  performance of its duties  hereunder from any
one of the President,  a Vice  President,  the Secretary or the Treasurer of the
Company,  and to apply to such officers for advice or instructions in connection
with its duties,  and it shall not be liable for any action taken or suffered to
be  taken  by it in good  faith  in  accordance  with  instructions  of any such
officer.  Any application by the Rights Agent for written  instructions from the
Company may, at the option of the Rights Agent,  set forth in writing any action
proposed to be taken or omitted by the Rights Agent under this Agreement and the
date on or after  which such  action  shall be taken or such  omission  shall be
effective.  The Rights  Agent  shall not be liable  for any action  taken by, or
omission of, the Rights Agent in accordance with a proposal included in any such
application on or after the date specified in such application (which date shall
not be less than ten  Business  Days after the date any  officer of the  Company
actually receives such application, unless any such officer shall have consented
in writing to an earlier date)  unless,  prior to taking any such action (or the
effective  date  in the  case of an  omission),  the  Rights  Agent  shall  have
received, in response to such application,  written instructions with respect to
the proposed  action or omission  specifying  a different  action to be taken or
omitted.

     (h) The Rights Agent and any stockholder,  director, officer or employee of
the Rights Agent may buy, sell or deal in any of the Rights or other  securities
of the Company or become pecuniarily  interested in any transaction in which the
Company  may be  interested,  or  contract  with or lend money to the Company or
otherwise  act as fully and freely as though it were not Rights Agent under this
Agreement.  Nothing  herein  shall  preclude the Rights Agent from acting in any
other capacity for the Company or for any other legal entity.

     (i) The Rights  Agent may execute and  exercise any of the rights or powers
hereby vested in it or perform any duty hereunder either itself or by or through
its  attorneys  or  agents,  and the Rights  Agent  shall not be  answerable  or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the  Company  resulting  from any such  act,  default,
neglect or misconduct,  provided  reasonable care was exercised in the selection
and continued employment thereof.

     (j) No provision of this Agreement shall require the Rights Agent to expend
or risk  its own  funds  or  otherwise  incur  any  financial  liability  in the
performance  of any of its duties  hereunder or in the exercise of its rights if
there shall be reasonable  grounds for believing that repayment of such funds or
adequate  indemnification  against  such  risk or  liability  is not  reasonably
assured to it.

                                     - 22 -


     (k) The Rights  Agent  shall not be required to take notice or be deemed to
have notice of any fact, event or determination (including,  without limitation,
any dates or events defined in this  Agreement or the  designation of any Person
as an Acquiring Person,  Affiliate or Associate) under this Agreement unless and
until the Rights Agent shall be specifically  notified in writing by the Company
of such fact, event or determination.

     Section 21. Change of Rights Agent.
                 ----------------------

     The Rights  Agent and any  successor  thereto may resign and be  discharged
from its duties under this  Agreement  upon 30 days' notice in writing mailed to
the Company and to each  transfer  agent of the Common  Shares and the Preferred
Shares by registered or certified mail,  and, at the expense of the Company,  to
the  holders of the Right  Certificates  by  first-class  mail.  The Company may
remove  the  Rights  Agent or any  successor  thereto  upon 30 days'  notice  in
writing, mailed to the Rights Agent or its successor, as the case may be, and to
each transfer agent of the Common Shares and the Preferred  Shares by registered
or certified  mail, and to the holders of the Right  Certificates by first-class
mail. If the Rights Agent shall resign or be removed or shall  otherwise  become
incapable of acting,  the Company shall appoint a successor to the Rights Agent.
If the Company  shall fail to make such  appointment  within a period of 30 days
after giving  notice of such removal or after it has been notified in writing of
such resignation or incapacity by the resigning or incapacitated Rights Agent or
by the holder of a Right Certificate (who shall,  with such notice,  submit such
holder's Right  Certificate for inspection by the Company),  then the registered
holder of any Right Certificate may apply to any court of competent jurisdiction
for the appointment of a new Rights Agent. Any successor  Rights Agent,  whether
appointed by the Company or by such a court,  shall be a  corporation  organized
and doing  business  under the laws of the United  States or of any state of the
United States, in good standing, having an office in the State of New York which
is authorized under such laws to exercise  corporate trust powers and is subject
to supervision or examination by federal or state authority and which has at the
time of its  appointment  as Rights  Agent a combined  capital and surplus of at
least $100.0 million.  After  appointment,  the successor  Rights Agent shall be
vested with the same powers,  rights,  duties and  responsibilities as if it had
been  originally  named as Rights Agent without  further act or deed;  provided,
however,  the  predecessor  Rights  Agent  shall  deliver  and  transfer  to the
successor  Rights  Agent  any  property  at the time held by it  hereunder,  and
execute and deliver any further assurance, conveyance, act or deed necessary for
the  purpose.  Not later than the  effective  date of any such  appointment  the
Company shall file notice thereof in writing with the  predecessor  Rights Agent
and each transfer agent of the Common Shares and the Preferred Shares,  and mail
a notice thereof in writing to the registered holders of the Right Certificates.
Failure to give any notice  provided  for in this  Section 21,  however,  or any
defect therein,  shall not affect the legality or validity of the resignation or
removal of the Rights Agent or the appointment of the successor Rights Agent, as
the case may be.

     Section 22. Issuance of New Right Certificates.
                 ----------------------------------

     Notwithstanding any of the provisions of this Agreement or of the Rights to
the  contrary,  the Company  may, at its  option,  issue new Right  Certificates
evidencing  Rights in such form as may be approved by its Board of  Directors to
reflect any adjustment or change in the Purchase Price and the number or kind or
class of shares or other  securities  or  property  purchasable  under the Right

                                     - 23 -


Certificates  made in  accordance  with the  provisions  of this  Agreement.  In
addition, in connection with the issuance or sale of Common Shares following the
Distribution  Date and prior to the earlier of the Redemption Date and the Close
of Business on the Final Expiration Date, the Company may with respect to shares
of  Common  Shares  so  issued or sold  pursuant  to (i) the  exercise  of stock
options, (ii) under any employment plan or arrangement, (iii) upon the exercise,
conversion or exchange of securities,  notes or debentures issued by the Company
or (iv) a contractual  obligation of the Company, in each case existing prior to
the  Distribution  Date, issue Right  Certificates  representing the appropriate
number  of  Rights  in  connection  with  such  issuance  or sale.

     Section 23. Redemption.
                 ----------

     (a) The Board of Directors of the Company may, in its sole  discretion,  at
any time prior to such time as any Person  becomes an Acquiring  Person,  redeem
all but not less than all of the then  outstanding  Rights at a redemption price
of $0.001 per Right,  appropriately  adjusted to reflect any stock split,  stock
dividend or similar transaction occurring after the date hereof (such redemption
price being hereinafter  referred to as the "Redemption  Price"). The redemption
of the Rights by the Board of Directors  may be made  effective at such time, on
such  basis  and  subject  to such  conditions  as the  Board of  Directors  may
establish in its sole discretion.

     (b) Immediately upon the time of the effectiveness of the redemption of the
Rights  pursuant to  paragraph  (a) of this  Section 23 or such earlier date and
time as may be determined by the Board of Directors of the Company in the action
ordering  such  redemption  (although  not earlier than the time of such action)
(such date and time being hereafter  referred to as the "Redemption  Date"), and
without any further  action and  without any notice,  the right to exercise  the
Rights shall  terminate  and the only right  thereafter of the holders of Rights
shall be to receive the Redemption Price. The Company shall promptly give public
notice of any such redemption;  provided,  however, that the failure to give, or
any defect in, any such notice shall not affect the validity of such redemption.
Within  10 days  after  such  action  of the  Board of  Directors  ordering  the
redemption  of the Rights  pursuant to paragraph  (a), the Company  shall mail a
notice of redemption to all the holders of the then outstanding  Rights at their
most recent  address as they appear upon the registry  books of the Rights Agent
or, prior to the Distribution  Date, on the registry books of the transfer agent
for the Common Shares.  Any notice which is mailed in the manner herein provided
shall be deemed given,  whether or not the holder  receives such notice.  If the
payment of the  Redemption  Price is not included  with such  notice,  each such
notice shall state the method by which the payment of the Redemption  Price will
be made. Neither the Company nor any of its Affiliates or Associates may redeem,
acquire or  purchase  for value any Rights at any time in any manner  other than
that  specifically  set forth in this Section 23 or in Section 24 hereof,  other
than in connection with the purchase of Common Shares prior to the  Distribution
Date.

     Section 24. Exchange.
                 --------

     (a) The Board of Directors of the Company may, in its sole  discretion,  at
any time and from time to time after any Person  becomes  an  Acquiring  Person,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include  Rights that have become void pursuant to the  provisions of Section
11(a)(ii) hereof) for Common Shares at an exchange ratio of one Common Share per

                                     - 24 -


Right,  appropriately  adjusted to reflect any stock  split,  stock  dividend or
similar  transaction  occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "Exchange Ratio"). Notwithstanding the foregoing,
the Board of Directors  shall not be  empowered  to effect such  exchange at any
time after any Person  (other than the Company,  any  Subsidiary of the Company,
any employee benefit plan of the Company or any such  Subsidiary,  or any entity
holding  Common Shares for or pursuant to the terms of any such plan),  together
with all Affiliates and Associates of such Person,  becomes the Beneficial Owner
of a majority of the Common Shares then outstanding.

     (b)  Immediately  upon the action of the Board of  Directors of the Company
ordering the exchange of any Rights  pursuant to subsection  (a) of this Section
24 and without any further action and without any notice,  the right to exercise
such Rights shall  terminate  and the only right  thereafter of a holder of such
Rights shall be to receive  that number of Common  Shares equal to the number of
such Rights held by such holder  multiplied by the Exchange  Ratio.  The Company
shall promptly give public notice of any such exchange;  provided, however, that
the failure to give, or any defect in, such notice shall not affect the validity
of such exchange.  The Company promptly shall mail a notice of any such exchange
to all of the holders of such Rights at their most recent address as they appear
upon the registry  books of the Rights Agent.  Any notice which is mailed in the
manner herein provided shall be deemed given, whether or not the holder receives
the  notice.  Each such  notice of  exchange  will state the method by which the
exchange of the Common  Shares for Rights will be effected  and, in the event of
any partial exchange, the number of Rights which will be exchanged.  Any partial
exchange  shall be effected  pro rata based on the number of Rights  (other than
Rights which have become void pursuant to the  provisions  of Section  11(a)(ii)
hereof) held by each holder of Rights.

     (c) In any exchange  pursuant to this Section 24, the Company,  in its sole
discretion,  may substitute  Preferred  Shares or Common Share  Equivalents  for
Common Shares exchangeable for Rights, at the initial rate of one one-thousandth
of a Preferred Share (or an appropriate  number of Common Share Equivalents) for
each Common  Share,  as  appropriately  adjusted to reflect  adjustments  in the
voting rights of the Preferred Shares pursuant to the terms thereof, so that the
fraction of a Preferred  Share delivered in lieu of each Common Share shall have
the same voting rights as one Common Share.

     (d) In  the  event  that  there  shall  not be  sufficient  Common  Shares,
Preferred  Shares  or  Common  Share  Equivalents  authorized  by the  Company's
Certificate of Incorporation  and not outstanding or subscribed for, or reserved
or otherwise  committed  for issuance for purposes  other than upon  exercise of
Rights, to permit any exchange of Rights as contemplated in accordance with this
Section 24, the Company shall  promptly take all such action as may be necessary
or desired to authorize and issue additional Common Shares,  Preferred Shares or
Common Share Equivalents for issuance upon exchange of Rights.

     (e) The Company  shall not be required to issue  fractions of Common Shares
or to distribute  certificates which evidence  fractional Common Shares. In lieu
of such  fractional  Common  Shares,  the  Company  shall pay to the  registered
holders of the Right  Certificates  with regard to which such fractional  Common
Shares would  otherwise be issuable an amount in cash equal to the same fraction
of the current per share market value of a whole Common Share.  For the purposes
of this  paragraph  (e),  the current per share  market  value of a whole Common
Share shall be the closing  price of a Common Share (as  determined  pursuant to
the second sentence of Section  11(d)(i) hereof) for the Trading Day immediately
prior to the date of exchange pursuant to this Section 24.

                                     - 25 -


     Section 25. Notice of Certain Events.
                 ------------------------

     (a) In case the Company  shall  propose at any time after the  Distribution
Date (i) to pay any dividend payable in stock of any class to the holders of its
Preferred  Shares  or to make  any  other  distribution  to the  holders  of its
Preferred Shares (other than a regular  quarterly cash dividend),  (ii) to offer
to the holders of its Preferred Shares rights or warrants to subscribe for or to
purchase any additional  Preferred Shares or shares of stock of any class or any
other securities, rights or options, (iii) to effect any reclassification of its
Preferred Shares (other than a  reclassification  involving only the subdivision
of outstanding  Preferred  Shares),  (iv) to effect any  consolidation or merger
into or with, or to effect any sale or other  transfer (or to permit one or more
of its  Subsidiaries  to  effect  any  sale or other  transfer),  in one or more
transactions,  of 50% or more of the assets or earning  power of the Company and
its  Subsidiaries  (taken as a whole)  to, any other  Person,  (v) to effect the
liquidation, dissolution or winding up of the Company, or (vi) to declare or pay
any  dividend  on the  Common  Shares  payable  in Common  Shares or to effect a
subdivision,   combination   or   consolidation   of  the   Common   Shares  (by
reclassification  or otherwise  than by payment of dividends in Common  Shares),
then,  in each such  case,  the  Company  shall  give to each  holder of a Right
Certificate,  in  accordance  with Section 26 hereof,  a notice of such proposed
action,  which  shall  specify  the record  date for the  purposes of such stock
dividend,  or  distribution  of rights or  warrants,  or the date on which  such
reclassification,    consolidation,   merger,   sale,   transfer,   liquidation,
dissolution or winding up is to take place and the date of participation therein
by the holders of the Common Shares and/or Preferred Shares, if any such date is
to be fixed, and such notice shall be so given in the case of any action covered
by  clause  (i) or (ii)  above  at least 10 days  prior to the  record  date for
determining  holders of the Preferred Shares for purposes of such action, and in
the case of any such  other  action,  at least 10 days  prior to the date of the
taking of such  proposed  action  or the date of  participation  therein  by the
holders of the Common Shares and/or  Preferred  Shares,  whichever  shall be the
earlier.

     (b) In case any event set forth in Section  11(a)(ii)  hereof  shall occur,
then the Company shall as soon as practicable  thereafter give to each holder of
a Right  Certificate,  in  accordance  with  Section 26 hereof,  a notice of the
occurrence  of such  event,  which  notice  shall  describe  such  event and the
consequences of such event to holders of Rights under Section 11(a)(ii) hereof.


     Section 26. Notices.
                 -------

     Notices or demands  authorized by this Agreement to be given or made by the
Rights  Agent or by the  holder of any Right  Certificate  to or on the  Company
shall  be  sufficiently  given  or made if sent  by  first-class  mail,  postage
prepaid,  addressed  (until another  address is filed in writing with the Rights
Agent) as follows:

                  Immunomedics, Inc.
                  300 American Road
                  Morris Plains, NJ  07950
                  Attention:  President

                  Copy to:

                  Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.
                  One Financial Center
                  Boston, MA  02111
                  Attention:  Joseph E. Mullaney III, Esquire

                                     - 26 -


Subject to the provisions of Section 21 hereof,  any notice or demand authorized
by this  Agreement  to be given or made by the  Company  or by the holder of any
Right Certificate to or on the Rights Agent shall be sufficiently  given or made
if sent by registered  or certified  mail and shall be deemed given upon receipt
and,  addressed  (until another address is filed in writing with the Company) as
follows:

                  American Stock Transfer & Trust Company
                  59 Maiden Lane
                  New York, NY 10038
                  Attention:  Corporate Trust Department

Notices  or  demands  authorized  by this  Agreement  to be given or made by the
Company or the  Rights  Agent to the  holder of any Right  Certificate  shall be
sufficiently  given  or  made  if sent by  first-class  mail,  postage  prepaid,
addressed  to such holder at the address of such holder as shown on the registry
books of the Company.

     Section 27. Supplements and Amendments.
                 --------------------------

     The  Company  may from time to time,  and the Rights  Agent  shall,  if the
Company so directs,  supplement or amend this Agreement  without the approval of
any holders of Right Certificates in order to cure any ambiguity,  to correct or
supplement any provision contained herein which may be defective or inconsistent
with any  other  provisions  herein,  or to make any  change  to or  delete  any
provision  hereof or to adopt any other  provisions  with  respect to the Rights
which the Company may deem necessary or desirable;  provided, however, that from
and after such time as any Person  becomes an Acquiring  Person,  this Agreement
shall not be amended or supplemented in any manner which would adversely  affect
the interests of the holders of Rights  (other than an Acquiring  Person and its
Affiliates  and  Associates).  Any  supplement  or amendment  authorized by this
Section 27 will be evidenced  by a writing  signed by the Company and the Rights
Agent. Notwithstanding anything in this Agreement to the contrary, no supplement
or  amendment  that changes the rights and duties of the Rights Agent under this
Agreement  will be effective  against the Rights Agent  without the execution of
such supplement or amendment by the Rights Agent.

                                     - 27 -



     Section 28. Successors.
                 ----------

     All the covenants and provisions of this Agreement by or for the benefit of
the  Company or the Rights  Agent  shall bind and inure to the  benefit of their
respective  successors  and  assigns  hereunder.

     Section 29. Benefits of this Agreement.
                 --------------------------

     Nothing in this  Agreement  shall be  construed to give to any Person other
than the  Company,  the  Rights  Agent and the  registered  holders of the Right
Certificates  (and, prior to the Distribution Date, the Common Shares) any legal
or equitable  right,  remedy or claim under this  Agreement;  but this Agreement
shall be for the sole and exclusive benefit of the Company, the Rights Agent and
the registered holders of the Right Certificates (and, prior to the Distribution
Date, the Common Shares).

     Section 30. Severability.
                 ------------

     If any term,  provision,  covenant or restriction of this Agreement is held
by a court of competent  jurisdiction or other authority to be invalid,  void or
unenforceable,   the   remainder  of  the  terms,   provisions,   covenants  and
restrictions  of this Agreement  shall remain in full force and effect and shall
in no way be affected, impaired or invalidated.

     Section 31. Governing Law.
                 -------------

     This Agreement and each Right Certificate  issued hereunder shall be deemed
to be a  contract  made  under  the laws of the  State of  Delaware  and for all
purposes shall be governed by and construed in accordance  with the laws of such
State  applicable  to contracts to be made and  performed  entirely  within such
State.

     Section 32. Counterparts.
                 ------------

     This  Agreement may be executed in any number of  counterparts  and each of
such  counterparts  shall for all purposes be deemed to be an original,  and all
such counterparts shall together constitute but one and the same instrument.

     Section 33. Descriptive Headings.
                 --------------------

     Descriptive headings of the several Sections of this Agreement are inserted
for convenience only and shall not control or affect the meaning or construction
of any of the provisions hereof.

     Section 34. Administration.
                 --------------

     The Board of Directors of the Company  shall have the  exclusive  power and
authority to administer  and interpret the  provisions of this  Agreement and to
exercise all rights and powers specifically granted to the Board of Directors or
the Company or as may be necessary or  advisable in the  administration  of this
Agreement.  All such actions,  calculations,  determinations and interpretations
which are done or made by the Board of  Directors  in good faith shall be final,
conclusive  and binding on the  Company,  the Rights  Agent,  the holders of the
Rights and all other parties and shall not subject the Board of Directors to any
liability to the holders of the Rights.

                                     - 28 -



     IN WITNESS WHEREOF, the parties hereto have caused this Rights Agreement to
be duly executed and their  respective  corporate seals to be hereunder  affixed
and attested, all as of the day and year first above written.


Attest:                                     IMMUNOMEDICS, INC.


/s/ Cynthia Giordano                 /s/ Cynthia L. Sullivan
__________________________ By:___________________________________________
                             Name:   Cynthia L. Sullivan
                             Title:  President, Chief Executive Officer
                                     and Director



Attest:                         AMERICAN STOCK TRANSFER & TRUST COMPANY
                                            as Rights Agent


/s/ Susan Silver                     /s/ Herbert J. Lemmer
__________________________ By:___________________________________________
                              Name:  Herbert J. Lemmer
                              Title: Vice President





                                     - 29 -


                                                                       EXHIBIT A
                                                                       ---------

                                      FORM
                                       of
                           CERTIFICATE OF DESIGNATION
                                       of
                  SERIES G JUNIOR PARTICIPATING PREFERRED STOCK
                                       of
                               IMMUNOMEDICS, INC.

        -----------------------------------------------------------------
        (Pursuant to Section 151 of the Delaware General Corporation Law)
        -----------------------------------------------------------------

     Immunomedics,  Inc., a corporation organized and existing under the General
Corporation Law of the State of Delaware (hereinafter called the "Corporation"),
hereby  certifies  that the  following  resolution  was  adopted by the Board of
Directors  of the  Corporation  as  required  by  Section  151  of  the  General
Corporation Law at a meeting duly called and held on February 28, 2002:

     RESOLVED, that pursuant to the authority granted to and vested in the Board
of Directors of this Corporation (hereinafter called the "Board of Directors" or
the  "Board")  in  accordance   with  the  provisions  of  the   Certificate  of
Incorporation of the Corporation (the "Certificate of Incorporation"), the Board
of Directors  hereby  creates a series of Preferred  Stock,  par value $0.01 per
share  (the  "Preferred  Stock"),  of the  Corporation  and  hereby  states  the
designation and number of shares,  and fixes the relative  rights,  preferences,
and limitations thereof as follows:

     Section 1.  Designation  and  Amount.
                 ------------------------

     The  shares  of this  series  shall  be  designated  as  "Series  G  Junior
Participating  Preferred Stock" (the "Series G Preferred  Stock") and the number
of shares  constituting  the Series G Preferred  Stock  shall be  100,000.  Such
number of shares may be increased or decreased by resolution of the Board of



Directors;  provided,  that no  decrease  shall  reduce  the number of shares of
Series G  Preferred  Stock to a number  less  than the  number  of  shares  then
outstanding plus the number of shares reserved for issuance upon the exercise of
outstanding  options,   rights  or  warrants  or  upon  the  conversion  of  any
outstanding  securities  issued by the  Corporation  convertible  into  Series G
Preferred Stock.

     Section 2. Dividends and Distributions.
                ---------------------------

     (A)  Subject  to the  rights of the  holders of any shares of any series of
Preferred  Stock (or any other stock) ranking prior and superior to the Series G
Preferred  Stock with  respect to  dividends,  the holders of shares of Series G
Preferred  Stock shall be entitled to receive,  when,  as and if declared by the
Board of Directors  out of funds legally  available  for the purpose,  quarterly
dividends payable in cash on the last day of March, June, September and December
in each year (each such date being  referred to herein as a "Quarterly  Dividend
Payment Date"),  commencing on the first Quarterly  Dividend  Payment Date after
the first  issuance  of a share or  fraction  of a share of  Series G  Preferred
Stock, in an amount (if any) per share (rounded to the nearest cent), subject to
the provision for  adjustment  hereinafter  set forth,  equal to 1,000 times the
aggregate per share amount of all cash dividends,  and 1,000 times the aggregate
per  share  amount  (payable  in  kind)  of  all  non-cash  dividends  or  other
distributions,  other than a dividend  payable  in shares of Common  Stock,  par
value $0.01 per share (the "Common Stock"),  of the Corporation or a subdivision
of the outstanding  shares of Common Stock (by  reclassification  or otherwise),
declared on the Common Stock since the immediately  preceding Quarterly Dividend
Payment  Date or, with respect to the first  Quarterly  Dividend  Payment  Date,
since  the  first  issuance  of any  share or  fraction  of a share of  Series G
Preferred  Stock. In the event the Corporation  shall at any time declare or pay
any dividend on the Common Stock payable in shares of Common Stock,  or effect a
subdivision or combination or consolidation of the outstanding  shares of Common
Stock (by  reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the amount to which  holders  of shares of Series G  Preferred
Stock were entitled immediately prior to such event under the preceding sentence
shall be adjusted by  multiplying  such amount by a fraction,  the  numerator of
which is the number of shares of Common Stock outstanding immediately after such
event and the  denominator of which is the number of shares of Common Stock that
were outstanding immediately prior to such event.

     (B) The Corporation  shall declare a dividend or distribution on the Series
G Preferred Stock as provided in paragraph (A) of this Section immediately after
it  declares a  dividend  or  distribution  on the Common  Stock  (other  than a
dividend payable in shares of Common Stock).

     (C)  Dividends due pursuant to paragraph (A) of this Section shall begin to
accrue and be cumulative on outstanding  shares of Series G Preferred Stock from
the  Quarterly  Dividend  Payment Date next  preceding the date of issue of such
shares,  unless the date of issue of such shares is prior to the record date for
the first  Quarterly  Dividend  Payment  Date,  in which case  dividends on such
shares  shall begin to accrue from the date of issue of such  shares,  or unless
the date of issue is a Quarterly Dividend Payment Date or is a date after the

                                    - A-2 -


record  date for the  determination  of holders of shares of Series G  Preferred
Stock  entitled  to  receive a  quarterly  dividend  and before  such  Quarterly
Dividend  Payment Date, in either of which events such dividends  shall begin to
accrue and be cumulative from such Quarterly  Dividend Payment Date. Accrued but
unpaid dividends shall not bear interest. Dividends paid on the shares of Series
G Preferred  Stock in an amount less than the total amount of such  dividends at
the time  accrued and payable on such shares  shall be  allocated  pro rata on a
share-by-share basis among all such shares at the time outstanding. The Board of
Directors  may fix a record date for the  determination  of holders of shares of
Series  G  Preferred  Stock  entitled  to  receive  payment  of  a  dividend  or
distribution declared thereon,  which record date shall be not more than 60 days
prior to the date fixed for the payment thereof.

     Section 3. Voting Rights.
                -------------

     The holders of shares of Series G Preferred  Stock shall have the following
voting rights:

     (A) Subject to the provision for  adjustment  hereinafter  set forth,  each
share of Series G  Preferred  Stock shall  entitle  the holder  thereof to 1,000
votes on all matters submitted to a vote of the stockholders of the Corporation.
In the event the  Corporation  shall at any time  declare or pay any dividend on
the Common Stock payable in shares of Common Stock,  or effect a subdivision  or
combination  or  consolidation  of the  outstanding  shares of Common  Stock (by
reclassification  or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common  Stock,  then in each
such case the  number of votes per share to which  holders of shares of Series G
Preferred Stock were entitled  immediately prior to such event shall be adjusted
by multiplying  such number by a fraction,  the numerator of which is the number
of shares of Common  Stock  outstanding  immediately  after  such  event and the
denominator  of  which is the  number  of  shares  of  Common  Stock  that  were
outstanding immediately prior to such event.

     (B)  Except  as  otherwise   provided  in  the  Restated   Certificate   of
Incorporation, including any other Certificate of Designations creating a series
of  Preferred  Stock or any similar  stock,  or by law, the holders of shares of
Series G Preferred Stock and the holders of shares of Common Stock and any other
capital  stock of the  Corporation  having  general  voting  rights  shall  vote
together as one class on all matters  submitted to a vote of stockholders of the
Corporation.

     (C) Except as set forth herein, or as otherwise required by law, holders of
Series G Preferred  Stock shall have no special  voting rights and their consent
shall not be  required  (except to the  extent  they are  entitled  to vote with
holders of Common Stock as set forth herein) for taking any corporate action.

     Section 4. Certain Restrictions.
                --------------------

     (A)  Whenever  quarterly  dividends  or other  dividends  or  distributions
payable on the Series G Preferred Stock as provided in Section 2 are in arrears,
thereafter and until all accrued and unpaid dividends and distributions, whether
or not declared,  on shares of Series G Preferred Stock  outstanding  shall have
been paid in full, the Corporation shall not:

          (i) declare or pay dividends, or make any other distributions,  on any
     shares of stock ranking junior (either as to dividends or upon liquidation,
     dissolution or winding up) to the Series G Preferred Stock;

                                    - A-3 -


          (ii) declare or pay dividends, or make any other distributions, on any
     shares  of  stock  ranking  on a parity  (either  as to  dividends  or upon
     liquidation,  dissolution or winding up) with the Series G Preferred Stock,
     except  dividends paid ratably on the Series G Preferred Stock and all such
     parity stock on which  dividends are payable or in arrears in proportion to
     the  total  amounts  to  which  the  holders  of all such  shares  are then
     entitled; or

          (iii) redeem or purchase or otherwise acquire for consideration shares
     of any stock ranking  junior  (either as to dividends or upon  liquidation,
     dissolution or winding up) to the Series G Preferred  Stock,  provided that
     the  Corporation  may at any time  redeem,  purchase or  otherwise  acquire
     shares of any such junior  stock in exchange for shares of any stock of the
     Corporation   ranking  junior  (as  to  dividends  and  upon   dissolution,
     liquidation or winding up) to the Series G Preferred Stock.

     (B) The  Corporation  shall not permit any subsidiary of the Corporation to
purchase  or  otherwise  acquire  for  consideration  any shares of stock of the
Corporation unless the Corporation could, under paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

     Section 5. Reacquired Shares.
                -----------------

     Any shares of Series G Preferred Stock  purchased or otherwise  acquired by
the Corporation in any manner  whatsoever shall be retired and canceled promptly
after the  acquisition  thereof.  All such shares shall upon their  cancellation
become  authorized but unissued shares of Preferred Stock and may be reissued as
part  of a  new  series  of  Preferred  Stock  subject  to  the  conditions  and
restrictions  on issuance  set forth herein or in the  Restated  Certificate  of
Incorporation,  including any Certificate of  Designations  creating a series of
Preferred Stock or any similar stock, or as otherwise required by law.

     Section 6. Liquidation, Dissolution or Winding Up.
                --------------------------------------

     Upon any  liquidation,  dissolution  or winding up of the  Corporation  the
holders of shares of Series G  Preferred  Stock  shall be entitled to receive an
aggregate amount per share, subject to the provision for adjustment  hereinafter
set forth, equal to 1,000 times the aggregate amount to be distributed per share
to holders of shares of Common  Stock plus an amount  equal to any  accrued  and
unpaid dividends.  In the event the Corporation shall at any time declare or pay
any dividend on the Common Stock payable in shares of Common Stock,  or effect a
subdivision or combination or consolidation of the outstanding  shares of Common
Stock (by  reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the  aggregate  amount to which  holders of shares of Series G
Preferred  Stock  were  entitled  immediately  prior  to such  event  under  the
preceding  sentence shall be adjusted by  multiplying  such amount by a fraction
the  numerator  of which is the  number of shares  of Common  Stock  outstanding
immediately  after  such  event and the  denominator  of which is the  number of
shares of Common Stock that were outstanding immediately prior to such event.

     Section 7. Consolidation, Merger, Etc.
                --------------------------

     In case  the  Corporation  shall  enter  into  any  consolidation,  merger,
combination  or other  transaction  in which  the  shares  of  Common  Stock are
exchanged for or changed into other stock or  securities,  cash and/or any other
property,  then in any such case each share of Series G Preferred Stock shall at
the same time be  similarly  exchanged  or  changed  into an amount  per  share,
subject to the provision for adjustment  hereinafter  set forth,  equal to 1,000

                                    - A-4 -


times the aggregate amount of stock, securities,  cash and/or any other property
(payable  in kind),  as the case may be,  into  which or for which each share of
Common Stock is changed or exchanged.  In the event the Corporation shall at any
time declare or pay any dividend on the Common Stock payable in shares of Common
Stock,  or  effect  a  subdivision  or  combination  or   consolidation  of  the
outstanding  shares of Common Stock (by  reclassification  or otherwise  than by
payment of a dividend in shares of Common Stock) into a greater or lesser number
of shares of Common  Stock,  then in each such case the  amount set forth in the
preceding  sentence with respect to the exchange or change of shares of Series G
Preferred Stock shall be adjusted by multiplying such amount by a fraction,  the
numerator  of  which  is the  number  of  shares  of  Common  Stock  outstanding
immediately  after  such  event and the  denominator  of which is the  number of
shares of Common Stock that were outstanding immediately prior to such event.

     Section 8. Amendment.
                ---------

     The  Restated  Certificate  of  Incorporation  shall not be  amended in any
manner,  including in a merger or consolidation,  which would alter,  change, or
repeal the powers, preferences or special rights of the Series G Preferred Stock
so as to affect them adversely without the affirmative vote of the holders of at
least two-thirds of the outstanding  shares of Series G Preferred Stock,  voting
together as a single class.

     Section 9. Rank.
                ----

     The Series G Preferred  Stock shall  rank,  with  respect to the payment of
dividends and upon liquidation, dissolution and winding up, junior to all series
of Preferred Stock.







                           [INTENTIONALLY LEFT BLANK]




                                    - A-5 -






     IN WITNESS  WHEREOF,  this Certificate of Designation is executed on behalf
of the Corporation by its duly authorized officer this ___ day of March, 2002.


                                          IMMUNOMEDICS, INC.



                                           By: _______________________________
                                               Name:
                                               Title:










                                     - A-6 -



                                                                       EXHIBIT B
                                                                       ---------

                            FORM OF RIGHT CERTIFICATE



         Certificate No. R - _______                             _____ Rights


     NOT  EXERCISABLE  AFTER MARCH 1, 2012 OR EARLIER IF  REDEMPTION OR EXCHANGE
     OCCURS.  THE RIGHTS ARE  SUBJECT  TO  REDEMPTION  AT $0.01 PER RIGHT AND TO
     EXCHANGE  ON THE TERMS SET FORTH IN THE  RIGHTS  AGREEMENT.  UNDER  CERTAIN
     CIRCUMSTANCES, RIGHTS THAT ARE OR WERE ACQUIRED OR BENEFICIALLY OWNED BY AN
     ACQUIRING PERSON OR ANY ASSOCIATES OR AFFILIATES THEREOF (AS SUCH TERMS ARE
     DEFINED IN THE RIGHTS  AGREEMENT) OR ANY  SUBSEQUENT  HOLDER OF SUCH RIGHTS
     MAY BECOME NULL AND VOID.


Right Certificate
IMMUNOMEDICS, INC.

     This certifies that ________________________, or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement,  dated  as  of  March  4,  2002  (the  "Rights  Agreement"),  between
Immunomedics,  Inc., a Delaware corporation (the "Company"),  and American Stock
Transfer and Trust Company (the "Rights Agent"), to purchase from the Company at
any time  after the  Distribution  Date (as such term is  defined  in the Rights
Agreement) and prior to 5:00 P.M.,  eastern  standard time, on March 1, 2012, at
the principal  office of the Rights Agent,  or at the office of its successor as
Rights Agent, one one-thousandth of a fully paid non-assessable  share of Series
F  Junior  Participating  Preferred  Stock,  par  value  $0.01  per  share  (the
"Preferred  Shares"),  of the Company,  at a purchase price of One Hundred Fifty
Dollars  ($150.00) per one  one-thousandth  of a Preferred  Share (the "Purchase
Price"),  upon  presentation  and surrender of this Right  Certificate  with the
certification and the Form of Election to Purchase duly executed.  The number of
Rights   evidenced   by  this   Right   Certificate   (and  the  number  of  one
one-thousandths  of a  Preferred  Share  which may be  purchased  upon  exercise
hereof) set forth above,  and the Purchase Price set forth above, are the number
and  Purchase  Price as of March 4,  2002,  based  on the  Preferred  Shares  as
constituted  at such date.  As provided in the Rights  Agreement,  the  Purchase
Price and the number of one  one-thousandths  of a Preferred  Share which may be
purchased  upon the exercise of the Rights  evidenced by this Right  Certificate
are subject to modification and adjustment upon the happening of certain events.



     From and after the occurrence of an event described in Section 11(a)(ii) of
the Rights  Agreement,  if the Rights evidenced by this Right Certificate are or
were at any time on or after the  earlier  of (x) the date of such event and (y)
the Distribution Date (as such term is defined in the Rights Agreement) acquired
or beneficially  owned by an Acquiring Person or an Associate or Affiliate of an
Acquiring  Person (as such terms are  defined  in the  Rights  Agreement),  such
Rights shall become void, and any holder of such Rights shall thereafter have no
right to exercise such Rights.

     This Right  Certificate  is subject  to all of the  terms,  provisions  and
conditions of the Rights Agreement,  which terms,  provisions and conditions are
hereby  incorporated  herein by  reference  and made a part  hereof and to which
Rights Agreement  reference is hereby made for a full description of the rights,
limitations  of rights,  obligations,  duties and  immunities  hereunder  of the
Rights Agent, the Company and the holders of the Right  Certificates.  Copies of
the  Rights  Agreement  are on file at the  principal  executive  offices of the
Company and the offices of the Rights Agent.

     This Right  Certificate,  with or without  other Right  Certificates,  upon
surrender at the  principal  office of the Rights  Agent,  may be exchanged  for
another  Right  Certificate  or  Right  Certificates  of  like  tenor  and  date
evidencing  Rights  entitling the holder to purchase a like aggregate  number of
Preferred  Shares as the  Rights  evidenced  by the Right  Certificate  or Right
Certificates  surrendered  shall have entitled such holder to purchase.  If this
Right  Certificate  shall be exercised in part,  the holder shall be entitled to
receive upon surrender  hereof another Right  Certificate or Right  Certificates
for the number of whole Rights not exercised.

     Subject to the provisions of the Rights Agreement, at the Company's option,
the Rights evidenced by this Certificate (i) may be redeemed by the Company at a
redemption  price of $0.001  per Right or (ii) may be  exchanged  in whole or in
part for shares of the  Company's  Common Stock,  par value $0.01 per share,  or
Preferred Shares.

     No  fractional  Preferred  Shares will be issued  upon the  exercise of any
Right or Rights  evidenced  hereby  (other  than  fractions  which are  integral
multiples of one one-thousandth of a Preferred Share, which may, at the election
of the Company, be evidenced by depositary receipts), but in lieu thereof a cash
payment will be made, as provided in the Rights Agreement.

     No holder of this Right  Certificate  shall be  entitled to vote or receive
dividends or be deemed for any purpose the holder of the Preferred  Shares or of
any other  securities  of the  Company  which may at any time be issuable on the
exercise hereof,  nor shall anything contained in the Rights Agreement or herein
be construed to confer upon the holder  hereof,  as such, any of the rights of a
stockholder of the Company or any right to vote for the election of directors or
upon any matter submitted to stockholders at any meeting thereof,  or to give or
withhold  consent to any corporate  action,  or to receive notice of meetings or
other  actions  affecting   stockholders  (except  as  provided  in  the  Rights
Agreement), or to receive dividends or subscription rights, or otherwise,  until
the  Right or  Rights  evidenced  by this  Right  Certificate  shall  have  been
exercised as provided in the Rights Agreement.

     This Right  Certificate  shall not be valid or  obligatory  for any purpose
until it shall have been countersigned by the Rights Agent.

                                    - B-2 -







     WITNESS the facsimile  signature of the proper  officers of the Company and
its corporate seal. Dated as of ____________, _____.


Attest:                                     IMMUNOMEDICS, INC.


_____________________________               By:    _____________________________

Countersigned:


_____________________________
Rights Agent



By:   __________________________
      Authorized Signature



                                    - B-3 -




                    Form of Reverse Side of Right Certificate

                               FORM OF ASSIGNMENT
                               ------------------
             (To be executed by the registered holder if such holder
                  desires to transfer the Right Certificate.)


     FOR  VALUE  RECEIVED   ______________________  hereby  sells,  assigns  and
transfers  unto  _______________________________________________________________
                         (Please print name and address of transferee)

this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint _______________________________,
Attorney, to transfer the within Right Certificate on the books of the
within-named Company, with full power of substitution.


Date:      ______________ __, _______


                                              __________________________________
                                                          Signature

Signature Guaranteed:

     Signatures  must be guaranteed by an "eligible  guarantor  institution"  as
defined in Rule 17Ad-15  promulgated under the Securities  Exchange Act of 1934,
as amended.

- ----------------------------------------------

     The undersigned  hereby  certifies that the Rights  evidenced by this Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).

                                              __________________________________
                                                          Signature

- ----------------------------------------------



                                    - B-4 -




             Form of Reverse Side of Right Certificate -- continued

                          FORM OF ELECTION TO PURCHASE
                          ----------------------------
                  (To be executed if holder desires to exercise
                            the Right Certificate.)


To IMMUNOMEDICS, INC.:

     The  undersigned  hereby  irrevocably  elects to  exercise  _______________
Rights  represented by this Right  Certificate to purchase the Preferred  Shares
issuable  upon the exercise of such Rights and requests  that  certificates  for
such Preferred Shares be issued in the name of:

Please insert social security
or other identifying number


________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________

If such  number of Rights  shall not be all the Rights  evidenced  by this Right
Certificate,  a new Right  Certificate for the balance  remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number


________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________



Dated: _____________ __, ______

                                              __________________________________
                                                         Signature
Signature Guaranteed:

     Signatures  must be guaranteed by an "eligible  guarantor  institution"  as
defined in Rule 17Ad-15  promulgated under the Securities  Exchange Act of 1934,
as amended.



                                    - B-5 -




             Form of Reverse Side of Right Certificate -- continued

- ----------------------------------------------

     The undersigned  hereby  certifies that the Rights  evidenced by this Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).



                                              __________________________________
                                                          Signature

- ----------------------------------------------

                                     NOTICE
                                     ------

     The  signature in the  foregoing  Forms of  Assignment  and  Election  must
conform to the name as written upon the face of this Right  Certificate in every
particular, without alteration or enlargement or any change whatsoever.

     In the event the certification set forth above in the Form of Assignment or
the Form of  Election to  Purchase,  as the case may be, is not  completed,  the
Company  and the  Rights  Agent  will deem the  beneficial  owner of the  Rights
evidenced by this Right Certificate to be an Acquiring Person or an Affiliate or
Associate  thereof (as defined in the Rights  Agreement) and such  Assignment or
Election to Purchase will not be honored.







                                    - B-6 -





                                                                       EXHIBIT C
                                                                       ---------

                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES



     On February 28, 2002,  the Board of Directors of  Immunomedics,  Inc.  (the
"Company") declared a dividend of one preferred share purchase right (a "Right")
for each  outstanding  share of Common  Stock,  par value  $0.01 per share  (the
"Common  Shares")  outstanding  on March  15,  2002 (the  "Record  Date") to the
stockholders of record on that date.  Each Right entitles the registered  holder
to purchase  from the Company one  one-thousandth  of a share of Series G Junior
Participating  Preferred  Stock,  par  value  $0.01 per  share  (the  "Preferred
Shares"),  of the Company, at a price of One Hundred Fifty Dollars ($150.00) per
one  one-thousandth  of a Preferred  Share (the  "Purchase  Price"),  subject to
adjustment.  The  description  and terms of the Rights are set forth in a Rights
Agreement  (the  "Rights  Agreement")  between the Company  and  American  Stock
Transfer and Trust Company, as Rights Agent (the "Rights Agent").

     Until the earlier to occur of (i) 10 days  following a public  announcement
that a person  or group of  affiliated  or  associated  persons  (an  "Acquiring
Person")  has  acquired  beneficial  ownership  of  15%  or,  in the  case  of a
Grandfathered   Stockholder   or  a  Second  Tier   Grandfathered   Stockholder,
respectively,  such percentage as is specified in the Rights Agreement,  or more
of the outstanding Common Shares or (ii) 10 business days (or such later date as
may be determined by action of the Board of Directors  prior to such time as any
Person  becomes  an  Acquiring   Person)   following  the  commencement  of,  or
announcement  of an  intention  to make,  a tender  offer or exchange  offer the
consummation  of which would result in the  beneficial  ownership by a person or
group of 15% or, in the case of a  Grandfathered  Stockholder  or a Second  Tier
Grandfathered Stockholder,  respectively, such percentage as is specified in the
Rights Agreement,  or more of the outstanding Common Shares (the earlier of such
dates being called the "Distribution Date"), the Rights will be evidenced,  with
respect to any of the Common  Share  certificates  outstanding  as of the Record
Date,  by such Common  Share  certificate  with a copy of this Summary of Rights
attached thereto.

     The Rights Agreement provides that, until the Distribution Date, the Rights
will be transferred with and only with the Common Shares. Until the Distribution
Date (or earlier  redemption  or  expiration  of the  Rights),  new Common Share
certificates  issued  after the Record Date or upon  transfer or new issuance of
Common  Shares will  contain a notation  incorporating  the Rights  Agreement by
reference.  Until the Distribution Date (or earlier  redemption or expiration of
the Rights),  the surrender for transfer of any  certificates  for Common Shares
outstanding as of the Record Date,  even without such notation or a copy of this
Summary of Rights being attached  thereto,  will also constitute the transfer of
the Rights associated with the Common Shares represented by such certificate. As
soon as  practicable  following the  Distribution  Date,  separate  certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of record
of the Common  Shares as of the Close of Business on the  Distribution  Date and
such separate Right Certificates alone will evidence the Rights.



     The Rights are not exercisable until the Distribution Date. The Rights will
expire  on March 1,  2012  (the  "Final  Expiration  Date"),  unless  the  Final
Expiration  Date is extended  or unless the Rights are  earlier  redeemed by the
Company, in each case, as described below.

     The Purchase  Price  payable,  and the number of Preferred  Shares or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from time to time to  prevent  dilution  (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or  warrants  to  subscribe  for or  purchase  Preferred  Shares at a price,  or
securities  convertible into Preferred Shares with a conversion price, less than
the  then  current  market  price of the  Preferred  Shares  or  (iii)  upon the
distribution to holders of the Preferred  Shares of evidences of indebtedness or
assets  (excluding  regular  periodic  cash  dividends  paid out of  earnings or
retained  earnings or dividends  payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

     The number of outstanding Rights and the number of one one-thousandths of a
Preferred  Share  issuable  upon  exercise  of each  Right are also  subject  to
adjustment  in the  event  of a stock  split  of the  Common  Shares  or a stock
dividend  on the  Common  Shares  payable  in  Common  Shares  or  subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

     Preferred  Shares  purchasable  upon  exercise  of the  Rights  will not be
redeemable.  Each  Preferred  Share will be  entitled  to a  quarterly  dividend
payment of 1,000 times the dividend  declared per Common Share.  In the event of
liquidation,  the  holders  of the  Preferred  Shares  will  be  entitled  to an
aggregate  payment of 1,000 times the  aggregate  payment made per Common Share.
Each  Preferred  Share will have 1,000 votes,  voting  together  with the Common
Shares. In the event of any merger,  consolidation or other transaction in which
Common Shares are exchanged,  each  Preferred  Share will be entitled to receive
1,000 times the amount received per Common Share.  These rights are protected by
customary anti-dilution provisions.

     Because of the nature of the Preferred  Shares'  dividend,  liquidation and
voting rights, the value of the one one-thousandth interest in a Preferred Share
purchasable  upon  exercise of each Right  should  approximate  the value of one
Common Share.

     From and after the occurrence of an event described in Section 11(a)(ii) of
the Rights  Agreement,  if the Rights evidenced by this Right Certificate are or
were at any time on or after the  earlier  of (x) the date of such event and (y)
the Distribution Date (as such term is defined in the Rights Agreement) acquired
or beneficially  owned by an Acquiring Person or an Associate or Affiliate of an
Acquiring  Person (as such terms are  defined  in the  Rights  Agreement),  such
Rights shall become void, and any holder of such Rights shall thereafter have no
right to exercise such Rights.

     In the event that, at any time after a Person becomes an Acquiring  Person,
the Company is acquired in a merger or other business combination transaction or
50% or more of its  consolidated  assets  or  earning  power  are  sold,  proper
provision will be made so that each holder of a Right will  thereafter  have the
right to receive,  upon the exercise  thereof at the then current exercise price
of the Right,  that number of shares of common  stock of the  acquiring  company

                                    - C-2 -


which at the time of such  transaction will have a market value of two times the
exercise  price of the Right.  In the event that any person becomes an Acquiring
Person,  proper  provision  shall be made so that each holder of a Right,  other
than Rights  beneficially  owned by the Acquiring  Person and its Affiliates and
Associates  (which will  thereafter be void),  will thereafter have the right to
receive upon  exercise that number of Common Shares having a market value of two
times the exercise price of the Right.  If the Company does not have  sufficient
Common Shares to satisfy such obligation to issue Common Shares, or if the Board
of Directors so elects,  the Company  shall deliver upon payment of the exercise
price of a Right an  amount  of cash or  securities  equivalent  in value to the
Common Shares  issuable upon exercise of a Right;  provided that, if the Company
fails to meet such obligation within 30 days following the date a Person becomes
an Acquiring  Person,  the Company must  deliver,  upon  exercise of a Right but
without  requiring  payment of the exercise price then in effect,  Common Shares
(to the extent available) and cash equal in value to the difference  between the
value of the Common Shares  otherwise  issuable upon the exercise of a Right and
the exercise price then in effect.  The Board of Directors may extend the 30-day
period  described  above for up to an additional 60 days to permit the taking of
action that may be necessary to authorize sufficient additional Common Shares to
permit the issuance of Common Shares upon the exercise in full of the Rights.

     At any time after any Person  becomes an Acquiring  Person and prior to the
acquisition  by any  person or group of a  majority  of the  outstanding  Common
Shares,  the Board of Directors  of the Company may  exchange the Rights  (other
than Rights owned by such person or group which have become  void),  in whole or
in part,  at an  exchange  ratio of one  Common  Share  per  Right  (subject  to
adjustment).

     With  certain  exceptions,  no  adjustment  in the  Purchase  Price will be
required until  cumulative  adjustments  require an adjustment of at least 1% in
such Purchase Price. No fractional  Preferred  Shares will be issued (other than
fractions  which are  integral  multiples of one  one-thousandth  of a Preferred
Share,  which may, at the  election of the Company,  be evidenced by  depositary
receipts) and in lieu  thereof,  an adjustment in cash will be made based on the
market price of the  Preferred  Shares on the last trading day prior to the date
of exercise.

     At any time prior to the time any Person becomes an Acquiring  Person,  the
Board of  Directors  of the Company  may redeem the Rights in whole,  but not in
part, at a price of $0.001 per Right (the "Redemption Price"). The redemption of
the  Rights  may be made  effective  at such  time,  on such basis and with such
conditions  as the Board of  Directors  in its sole  discretion  may  establish.
Immediately upon any redemption of the Rights,  the right to exercise the Rights
will  terminate  and the only right of the  holders of Rights will be to receive
the Redemption Price.

     The terms of the Rights may be  amended  by the Board of  Directors  of the
Company  without the consent of the holders of the Rights,  except that from and
after such time as any person becomes an Acquiring  Person no such amendment may
adversely  affect the  interests  of the  holders of the Rights  (other than the
Acquiring Person and its Affiliates and Associates).

                                    - C-3 -



     Until a Right is  exercised,  the  holder  thereof,  as such,  will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends.

     A copy of the  Agreement  has been filed with the  Securities  and Exchange
Commission as an Exhibit to a Registration  Statement on Form 8-A dated March 8,
2002. A copy of the Agreement is available free of charge from the Company. This
summary  description  of the  Rights  does not  purport  to be  complete  and is
qualified  in its  entirety  by  reference  to the  Agreement,  which is  hereby
incorporated herein by reference.




                                    - C-4 -



                                  EXHIBIT 99.1
                                  ------------

            IMMUNOMEDICS ADOPTS NEW 2002 STOCKHOLDERS RIGHTS PLAN TO
                        REPLACE EXISTING 1998 RIGHTS PLAN


Morris Plains,  NJ, March 4, 2002 --- Immunomedics,  Inc.  (Nasdaq:  IMMU) today
announced  that its  Board of  Directors  has  approved  the  redemption  of all
outstanding Rights under its 1998 Stockholder Rights Plan in connection with the
adoption  of  a  new  2002  Stockholder   Rights  Plan.  Holders  of  shares  of
Immunomedics  common  stock as of the close of  business  on March 15, 2002 will
receive $0.001 for each  outstanding  Right to be redeemed under the 1998 Rights
Plan, as well as a dividend in the form of one Right under the 2002 Rights Plan,
in each case for each share of common  stock held as of such date.  The Board of
Directors  approved  an Exercise  Price under the 2002 Rights Plan of $150.  per
Right, in part, upon the advice of their financial advisors.

The 2002 Rights Plan is not being adopted in response to any specific  effort to
acquire  control of the  Company,  but  rather to  continue  to ensure  that all
Immunomedics'  shareholders  are treated  fairly in the event of an  unsolicited
takeover of the Company,  as well as to guard  against  partial  tender  offers,
squeeze-outs,  open  market  accumulation  and other  tactics  intended  to gain
control of Immunomedics without maximizing shareholder value.

The 2002  Rights  Plan,  like  the 1998  Plan,  provides  that if a third  party
acquires more than 15% of  Immunomedics'  common stock without prior approval of
the  Board  of  Directors,  all  stockholders  of the  Company  (other  than the
acquiring  party) will be entitled to buy either  shares of a special  series of
the Company's junior  participating  preferred stock, or shares of the Company's
common  stock with a market  value equal to double the  Exercise  Price for each
2002 Right they hold.  Under these  circumstances,  the Board of  Directors  may
instead allow each such Right (other than those held by the acquiring  party) to
be  exchanged  for one share of the  Company's  common  stock.  The  exercise or
exchange of these 2002 Rights would have a  substantial  dilutive  effect on the
acquiring party.

Immunomedics  is  a  biopharmaceutical   company  focused  on  the  development,
manufacture and commercialization of diagnostic imaging and therapeutic products
for the detection and treatment of cancer and infectious  diseases.  Integral to
these products are highly specific monoclonal  antibodies and antibody fragments
designed  to deliver  radioisotopes  and  chemotherapeutic  agents to tumors and
sites of  infection.  Immunomedics  has five  therapeutic  products  in clinical
trials and has two  marketed  diagnostic  imaging  products.  The most  advanced
therapeutic  product  candidates are LymphoCide(tm)  (epratuzumab),  which is in
Phase II and  Phase III  clinical  trials  for the  treatment  of  non-Hodgkin's
lymphoma, and CEA-Cide(tm) (labetuzumab), which is in Phase I/II clinical trials
for the treatment of certain solid tumors.

This release, in addition to historical  information,  contains  forward-looking
statements  made  pursuant to the Private  Securities  Litigation  Reform Act of
1995. Such statements,  including statements regarding clinical trials,  involve
significant  risks and  uncertainties and actual results could differ materially
from  those  expressed  or  implied  herein.   Factors  that  could  cause  such
differences  include,  but are not limited to, risks associated with new product
development     (including    clinical    trials    outcome    and    regulatory
requirements/actions),  competitive  risks to marketed products and availability
of financing and other sources of capital, as well as the risks discussed in the
Company's Quarterly Report on Form 10-Q for the quarter ended December 31, 2001.

Company Contact: Rebecca Kinner, Investor Relations,  (973) 605-8200,  extension
263. Visit the company's web site at http://www.Immunomedics.com