REGISTRATION RIGHTS AGREEMENT


         REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of December,
9,  1998,  by  and  among  Immunomedics,  Inc.,  a  Delaware  corporation,  with
headquarters  located at 300 American Road, Morris Plains, New Jersey 07950 (the
"Company"),  and the undersigned  buyers (each, a "Buyer" and collectively,  the
"Buyers").

         WHEREAS:

         A. In connection  with the Securities  Purchase  Agreement by and among
the parties hereto of even date herewith (the "Securities Purchase  Agreement"),
the  Company has agreed,  upon the terms and  subject to the  conditions  of the
Securities  Purchase  Agreement,  to issue and sell to the Buyers  shares of the
Company's Series F Convertible Preferred Stock (the "Initial Preferred Shares"),
which will be convertible  into shares of the Company's  common stock, par value
$.01 per  share  (the  "Common  Stock")  in  accordance  with  the  terms of the
Company's  Certificate of  Designations,  Preferences and Rights of the Series F
Convertible Preferred Stock (the "Certificate of Designations"); and

         B. In connection with the Securities Purchase Agreement, each Buyer may
be obligated,  upon the terms and subject to the  conditions  of the  Securities
Purchase  Agreement,  to purchase  shares of the Company's  Series F Convertible
Preferred  Stock (the "Put Preferred  Shares"),  which will be convertible  into
shares of  Common  Stock in  accordance  with the  terms of the  Certificate  of
Designations  (the Initial  Preferred  Shares and the Put  Preferred  Shares are
collectively  referred  to as  the  "Preferred  Shares"  and as  converted,  the
"Conversion Shares"); and

         C. To induce the Buyers to execute and deliver the Securities  Purchase
Agreement,  the Company has agreed to provide certain  registration rights under
the  Securities  Act  of  1933,  as  amended,  and  the  rules  and  regulations
thereunder, or any similar successor statute (collectively, the "1933 Act"), and
applicable state securities laws.

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  contained  herein  and other  good and  valuable  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the Company and the
Buyers hereby agree as follows:

         1.       DEFINITIONS.

                  As used in this Agreement,  the following terms shall have the
following meanings:






                  a.  "Investor"  means a  Buyer,  any  transferee  or  assignee
thereof to whom a Buyer  assigns its rights under this  Agreement and who agrees
to become bound by the provisions of this Agreement in accordance with Section 9
and any transferee or assignee  thereof to whom a transferee or assignee assigns
its rights under this Agreement and who agrees to become bound by the provisions
of this Agreement in accordance with Section 9.

                  b. "Person" means a corporation,  a limited liability company,
an association,  a partnership,  an organization,  a business, an individual,  a
governmental or political subdivision thereof or a governmental agency.

                  c. "Register,"  "registered,"  and  "registration"  refer to a
registration   effected  by  preparing  and  filing  one  or  more  Registration
Statements  (as defined  below) in compliance  with the 1933 Act and pursuant to
Rule 415  under  the 1933  Act or any  successor  rule  providing  for  offering
securities on a continuous  basis ("Rule 415"),  and the declaration or ordering
of  effectiveness  of  such  Registration  Statement(s)  by  the  United  States
Securities and Exchange Commission (the "SEC").

                  d. "Registrable Securities" means the Conversion Shares issued
or issuable upon conversion of the Preferred Shares,  any shares of Common Stock
issued as payment of  Registration  Delay  Payments (as defined in Section 2(g))
and any  shares  of  capital  stock  issued  or  issuable  with  respect  to the
Conversion Shares or the Preferred Shares as a result of any stock split,  stock
dividend,  recapitalization,  exchange or similar  event or  otherwise,  without
regard to any limitation on conversions of Preferred Shares.

                  e.  "Initial  Registration  Statement"  means  a  registration
statement or  registration  statements  of the Company  filed under the 1933 Act
covering Registrable Securities relating to the Initial Preferred Shares.

                  f. "Put Registration Statement" means a registration statement
or  registration  statements  of the Company  filed under the 1933 Act  covering
Registrable Securities relating to the Put Preferred Shares.

                  g. "Registration  Statement"  means  the Initial  Registration
Statement and the Put  Registration Statement.

Capitalized  terms used herein and not otherwise  defined  herein shall have the
respective meanings set forth in the Securities Purchase Agreement.

         2.       REGISTRATION.

                  a.       Mandatory Registration.

                           (i)      Initial Mandatory Registration.  The Company
shall prepare,  and, as soon as  practicable  but in no event later than 45 days

                                     -2-


after the date of issuance of the relevant  Preferred Shares,  file with the SEC
an Initial  Registration  Statement or Initial  Registration  Statements  (as is
necessary) on Form S-3 covering the resale of all of the Registrable  Securities
issuable  pursuant to the Initial  Preferred  Shares (the  "Initial  Registrable
Securities"). In the event that Form S-3 is unavailable for such a registration,
the Company shall use such other form as is available  for such a  registration,
subject to the provisions of Section 2(e). The Initial Registration Statement or
Initial  Registration  Statements  prepared  pursuant  hereto shall register for
resale at least that  number of shares of Common  Stock  equal to the product of
(x) 2.0 and (y) the  number of  Initial  Registrable  Securities  as of the date
immediately  preceding the date the  Registration  Statement is initially  filed
with the SEC,  subject to adjustment  as provided in Section  2(f).  The Company
shall  use its  best  efforts  to have  the  Initial  Registration  Statement(s)
declared effective by the SEC as soon as practicable, but in no event later than
120 days after the issuance of the relevant Preferred Shares.

                           (ii)    Put Mandatory Registration. The Company shall
prepare,  and, as soon as practicable  but in no event later than ten days after
the Put Share  Notice Date (as defined in the  Securities  Purchase  Agreement),
file with the SEC a Put Registration  Statement or Put  Registration  Statements
(as is  necessary)  on Form S-3  covering  the resale of all of the  Registrable
Securities  issuable  pursuant to the Put  Preferred  Shares  covered by the Put
Share Notice (the "Put Registrable  Securities").  In the event that Form S-3 is
unavailable for such a registration, the Company shall use such other form as is
available for such a  registration,  subject to the  provisions of Section 2(e).
Any Put  Registration  Statement  prepared  pursuant  hereto shall  register for
resale at least that  number of shares of Common  Stock  equal to the product of
(x)  2.0 and  (y)  the  number  of Put  Registrable  Securities  as of the  date
immediately  preceding  the  date  such  Additional  Registration  Statement  is
initially filed with the SEC, subject to adjustment as provided in Section 2(f).
The Company shall use its best efforts to have the Put Registration Statement(s)
declared effective by the SEC as soon as practicable, but in no event later than
90 days after the Put Share Notice Date.

                  b.  Piggy-Back  Registrations.  If at any  time  prior  to the
expiration  of the  Registration  Period (as  hereinafter  defined)  the Company
proposes to file with the SEC a Registration  Statement  relating to an offering
for its own  account or the  account of others  under the 1933 Act of any of its
securities  (other  than on Form S-4 or Form S-8 (or their  equivalents  at such
time)  relating  to  securities  to be  issued  solely  in  connection  with any
acquisition  of  any  entity  or  business  or  equity  securities  issuable  in
connection with stock option or other employee  benefit plans) the Company shall
promptly send to each Investor who is entitled to registration rights under this
Section 2(b) written  notice of the Company's  intention to file a  Registration
Statement and of such  Investor's  rights under this Section 2(b) and, if within
twenty (20) days after receipt of such notice, such Investor shall so request in
writing,  the Company  shall include in such  Registration  Statement all or any
part of the  Registrable  Securities  such Investor  requests to be  registered,
subject  to the  priorities  set  forth  in  Section  2(b)  below.  No  right to
registration  of  Registrable  Securities  under  this  Section  2(b)  shall  be
construed to limit any registration required under Section 2(a). The obligations
of the Company  under this  Section  2(b) may be waived by  Investors  holding a
majority of the Registrable Securities.  If an offering in connection with which
an  Investor  is  entitled  to  registration  under  this  Section  2(b)  is  an
underwritten  offering,  then each Investor  whose  Registrable  Securities  are

                                      -3-


included in such  Registration  Statement shall,  unless otherwise agreed by the
Company,  offer and sell such Registrable Securities in an underwritten offering
using the same  underwriter or  underwriters  and,  subject to the provisions of
this Agreement, on the same terms and conditions as other shares of Common Stock
included  in such  underwritten  offering.  If a  registration  pursuant to this
Section  2(b)  is  to  be an  underwritten  public  offering  and  the  managing
underwriter(s)  advise the Company in  writing,  that in their  reasonable  good
faith  opinion,  marketing or other  factors  dictate  that a limitation  on the
number of  shares of Common  Stock  which may be  included  in the  Registration
Statement is  necessary  to  facilitate  and not  adversely  affect the proposed
offering,  then the Company shall include in such  registration:  (1) first, all
securities the Company proposes to sell for its own account,  (2) second,  up to
the full number of securities  proposed to be registered  for the account of the
holders  of  securities  entitled  to  inclusion  of  their  securities  in  the
Registration  Statement by reason of demand registration  rights, and (3) third,
the securities  requested to be registered by the Investors and other holders of
securities  entitled to participate in the registration,  as of the date hereof,
drawn from them pro rata based on the number each has  requested  to be included
in such registration.

                  c. Allocation of Registrable Securities. The initial number of
Registrable  Securities included in any Registration Statement and each increase
in the number of Registrable  Securities included therein shall be allocated pro
rata among the Investors  based on the number of Registrable  Securities held by
each  Investor at the time the  Registration  Statement  covering  such  initial
number of Registrable  Securities or increase  thereof is declared  effective by
the SEC. In the event that an Investor sells or otherwise  transfers any of such
Person's Registrable  Securities,  each transferee shall be allocated a pro rata
portion of the then remaining number of Registrable  Securities included in such
Registration Statement for such transferor.  Any shares of Common Stock included
in a  Registration  Statement  and which  remain  allocated  to any Person which
ceases to hold any  Registrable  Securities  shall be allocated to the remaining
Investors,  pro rata based on the number of Registrable  Securities then held by
such Investors.

                  d. Legal  Counsel.  Subject  to  Section 5 hereof,  the Buyers
holding a majority of the Registrable  Securities shall have the right to select
one legal counsel to review and oversee any offering  pursuant to this Section 2
("Legal Counsel"), which shall be Katten Muchin & Zavis or such other counsel as
thereafter  designated by the holders of a majority of  Registrable  Securities.
The Company shall  reasonably  cooperate  with Legal  Counsel in performing  the
Company's obligations under this Agreement.

                  e.  Ineligibility  for Form S-3. In the event that Form S-3 is
not available for any  registration  of Registrable  Securities  hereunder,  the
Company  shall (i) register the sale of the  Registrable  Securities  on another
appropriate  form and (ii) undertake to register the  Registrable  Securities on
Form S-3 as soon as such form is  available,  provided  that the  Company  shall
maintain the  effectiveness of the  Registration  Statement then in effect until
such time as a  Registration  Statement  on Form S-3  covering  the  Registrable
Securities has been declared effective by the SEC.


                                      -4-



                  f. Sufficient  Number of Shares  Registered.  In the event the
number of shares  available  under a  Registration  Statement  filed pursuant to
Section 2(a) is insufficient  to cover all of the  Registrable  Securities or an
Investor's  allocated portion of the Registrable  Securities pursuant to Section
2(c),  the  Company  shall  amend  the  Registration  Statement,  or  file a new
Registration Statement (on the short form available therefor, if applicable), or
both, so as to cover at least 200% of such Registrable  Securities (based on the
then  current  market  price of the  Common  Stock),  in each  case,  as soon as
practicable,  but in any event  not  later  than  fifteen  (15)  days  after the
necessity  therefor arises.  The Company shall use it best efforts to cause such
amendment  and/or new  Registration  Statement  to become  effective  as soon as
practicable  following  the  filing  thereof.  For  purposes  of  the  foregoing
provision,  the number of shares available under a Registration  Statement shall
be deemed  "insufficient  to cover all of the Registrable  Securities" if at any
time the number of Registrable  Securities issued or issuable upon conversion of
the Preferred Shares is greater than the quotient determined by dividing (i) the
number of shares of Common Stock  available  for resale under such  Registration
Statement  by (ii)  1.5.  For  purposes  of the  calculation  set  forth  in the
foregoing  sentence,  any  restrictions on the  convertibility  of the Preferred
Shares shall be disregarded and such calculation shall assume that the Preferred
Shares are then  convertible  into shares of Common Stock at the then prevailing
Conversion Rate (as defined in the Company's Certificate of Designations).

                  g. Effect of Failure to Obtain and Maintain  Effectiveness  of
Registration Statement. If the Registration Statement covering the resale of all
of the shares of Common Stock issuable upon  conversion of the Preferred  Shares
covered by such  Registration  Statement and required to be filed by the Company
pursuant  to this  Agreement  is not (i)  filed  within  45 days of the  Initial
Closing  Date or within ten days of the Put Share Notice Date as the case may be
(each,  a "Scheduled  Filing  Date"),  (ii) declared  effective by the SEC on or
before the date which is 120 days after the Initial Closing Date or on or before
90 days after the Put Share Notice Date, as the case may be (each,  a "Scheduled
Effective Date"), or (iii) if after the Registration Statement has been declared
effective  by the SEC,  other than days  during an  Allowable  Grace  Period (as
defined in Section  3(v)),  available for the sales of all such shares of Common
Stock to be made  pursuant to the  respective  Registration  Statement  (whether
because of a failure to keep the Registration  Statement effective,  to disclose
such  information  as  is  necessary  for  sales  to be  made  pursuant  to  the
Registration  Statement,  to  register  sufficient  shares  of  Common  Stock or
otherwise),  then, as partial  relief for the damages to any holder by reason of
any such delay in or reduction of its ability to sell the  underlying  shares of
Common  Stock  (which  remedy  shall  not be  exclusive  of any  other  remedies
available  at law or in  equity),  the  Company  shall  pay to  each  holder  of
Preferred  Shares an amount in cash per Preferred Share held (which relates to a
Registration  Statement  which  was not  declared  effective  on or  before  its
Scheduled Effective Date or pursuant to which sales cannot be made) equal to the
sum of:

                           (i)      $150,  if the  Registration Statement is not
         filed by the Scheduled Filing Date;

                           (ii)     $150,  if the Registration  Statement is not
         declared  effective  by the  Scheduled Effective Date;

                                      -5-



                           (iii) $5  multiplied  by the sum of (x) the number of
         days after the  Scheduled  Filing Date during  which such  Registration
         Statement is not filed with the SEC,  plus (y) the number of days after
         the Scheduled Effective Date during which the Registration Statement is
         not declared  effective by the SEC,  plus (z) the number of days (other
         than days during an Allowable  Grace  Period) that sales cannot be made
         pursuant to the Registration Statement after the Registration Statement
         has been declared effective by the SEC.

The payments to which a holder  shall be entitled  pursuant to this Section 2(g)
are referred to herein as  "Registration  Delay  Payments."  Registration  Delay
Payments  shall be paid within five business days of the earlier of (i) the last
day of the month in which such  payments were incurred or (ii) the date that the
violation  which caused such payment is cured. In the event the Company fails to
make Registration  Delay Payments in a timely manner,  such  Registration  Delay
Payments shall bear interest at the rate of 1.5% per month (prorated for partial
months) until paid in full. If the Company fails to pay the  Registration  Delay
Payments,  including any interest  thereon,  within 15 business days of the date
incurred,  then the holder entitled to such payments shall have the right at any
time, so long as the Company continues to fail to make such payments, to require
the  Company,  upon  written  notice,  to  immediately  issue,  in  lieu  of the
Registration  Delay  Payments,  including  any interest  thereon,  the number of
shares of Common Stock equal to the quotient of (X) the sum of the  Registration
Delay Payments and all interest  accrued  thereon  divided by (Y) the Conversion
Price in effect on such Conversion Date as is specified by the holder in writing
to the Company.

         3.       RELATED OBLIGATIONS.

         Whenever an Investor has requested that any  Registrable  Securities be
registered  pursuant to Section 2(b) or at such time as the Company is obligated
to file a Registration  Statement with the SEC pursuant to Section 2(a) or 2(g),
the  Company  will  use its best  efforts  to  effect  the  registration  of the
Registrable  Securities in accordance  with the intended  method of  disposition
thereof and, pursuant thereto, the Company shall have the following obligations:

                  a. The Company shall promptly  prepare and file with the SEC a
Registration Statement with respect to the Initial Registrable Securities (on or
prior to the 45th day after the Initial  Closing  Date) and with  respect to the
Put  Registrable  Securities  (on or prior to the date which is ten days after a
Put Share Notice Date) for the registration of Registrable  Securities  pursuant
to Section  2(a) and use its best efforts to cause such  Registration  Statement
relating to the Registrable  Securities to become  effective as soon as possible
after such filing (but, in the case of the Initial Registrable Securities, in no
event later than 120 days after the Initial Closing Date, in the case of the Put
Registrable  Securities  and in no event  later than 90 days after the Put Share
Notice Date), and keep such Registration  Statement  effective  pursuant to Rule
415 at all times until the earlier of (i) the date as of which the Investors may
sell all of the  Registrable  Securities  without  restriction  pursuant to Rule
144(k) promulgated under the 1933 Act (or successor thereto) or (ii) the date on
which (A) the Investors shall have sold all the  Registrable  Securities and (B)

                                      -6-


none of the Preferred Shares is outstanding (the "Registration  Period"),  which
Registration  Statement  (including any  amendments or  supplements  thereto and
prospectuses  contained  therein)  shall not contain any untrue  statement  of a
material fact or omit to state a material fact required to be stated therein, or
necessary to make the statements therein, in light of the circumstances in which
they were made, not misleading.

                  b.  The  Company  shall  prepare  and  file  with the SEC such
amendments   (including   post-effective   amendments)   and  supplements  to  a
Registration   Statement  and  the  prospectus  used  in  connection  with  such
Registration  Statement,  which  prospectus is to be filed  pursuant to Rule 424
promulgated  under the 1933 Act, as may be necessary  to keep such  Registration
Statement  effective at all times during the  Registration  Period,  and, during
such  period,  comply with the  provisions  of the 1933 Act with  respect to the
disposition  of all  Registrable  Securities  of the  Company  covered  by  such
Registration  Statement  until such time as all of such  Registrable  Securities
shall  have  been  disposed  of in  accordance  with  the  intended  methods  of
disposition by the seller or sellers  thereof as set forth in such  Registration
Statement. In the case of amendments and supplements to a Registration Statement
which are required to be filed pursuant to this Agreement (including pursuant to
this Section 3(b)) by reason of the Company  filing a report on Form 10-K,  Form
10-Q or Form 8-K or any analogous  report under the  Securities  Exchange Act of
1934 (the "1934 Act"),  the Company shall file such  amendments  or  supplements
with the SEC on the same day on which the 1934 Act report is filed which created
the  requirement  for the  Company  to  amend  or  supplement  the  Registration
Statement.


                  c. The  Company  shall  permit  Legal  Counsel  to review  and
comment upon a Registration Statement and all amendments and supplements thereto
at least  seven (7) days prior to their  filing  with the SEC,  and not file any
document in a form to which Legal Counsel reasonably objects.  The Company shall
not submit a request for  acceleration  of the  effectiveness  of a Registration
Statement or any amendment or supplement  thereto  without the prior approval of
Legal Counsel,  which consent shall not be  unreasonably  withheld.  The Company
shall furnish to Legal Counsel,  without charge, (i) any correspondence from the
SEC or the staff of the SEC to the  Company or its  representatives  relating to
any Registration  Statement,  (ii) promptly after the same is prepared and filed
with  the SEC,  one  copy of any  Registration  Statement  and any  amendment(s)
thereto,   including   financial   statements  and   schedules,   all  documents
incorporated   therein  by  reference  and  all  exhibits  and  (iii)  upon  the
effectiveness of any Registration Statement, one copy of the prospectus included
in such Registration Statement and all amendments and supplements thereto.


                  d.  The  Company  shall   furnish  to  each   Investor   whose
Registrable  Securities  are  included in any  Registration  Statement,  without
charge, (i) promptly after the same is prepared and filed with the SEC, at least
one copy of such Registration Statement and any amendment(s) thereto,  including
financial  statements  and  schedules,  all  documents  incorporated  therein by
reference  and all  exhibits,  the  prospectus  included  in  such  Registration
Statement  (including  each  preliminary  prospectus)  and, with regards to such
Registration Statement(s),  any correspondence by or on behalf of the Company to
the SEC or the staff of the SEC and any correspondence from the SEC or the staff

                                      -7-


of the SEC to the Company or its representatives, (ii) upon the effectiveness of
any Registration  Statement,  ten (10) copies of the prospectus included in such
Registration Statement and all amendments and supplements thereto (or such other
number of copies as such Investor may  reasonably  request) and (iii) such other
documents,  including  copies of any  preliminary or final  prospectus,  as such
Investor may  reasonably  request from time to time in order to  facilitate  the
disposition of the Registrable Securities owned by such Investor.

                  e. The Company  shall use its best efforts to (i) register and
qualify the  Registrable  Securities  covered by a Registration  Statement under
such other  securities  or "blue sky" laws of such  jurisdictions  in the United
States as Legal Counsel or any Investor  reasonably  requests,  (ii) prepare and
file  in  those  jurisdictions,   such  amendments   (including   post-effective
amendments) and supplements to such  registrations and  qualifications as may be
necessary to maintain the effectiveness  thereof during the Registration Period,
(iii) take such other actions as may be necessary to maintain such registrations
and  qualifications in effect at all times during the Registration  Period,  and
(iv) take all other  actions  reasonably  necessary  or advisable to qualify the
Registrable Securities for sale in such jurisdictions;  provided,  however, that
the  Company  shall not be required in  connection  therewith  or as a condition
thereto to (x)  qualify to do business  in any  jurisdiction  where it would not
otherwise be required to qualify but for this Section 3(e),  (y) subject  itself
to general taxation in any such  jurisdiction,  or (z) file a general consent to
service of process in any such  jurisdiction.  The Company shall promptly notify
Legal Counsel and each Investor who holds Registrable  Securities of the receipt
by the  Company  of any  notification  with  respect  to the  suspension  of the
registration  or  qualification  of any of the  Registrable  Securities for sale
under the securities or "blue sky" laws of any jurisdiction in the United States
or its  receipt  of  actual  notice  of the  initiation  or  threatening  of any
proceeding for such purpose.

                  f.  In  the  event  Investors  who  hold  a  majority  of  the
Registrable Securities being offered in the offering select underwriters for the
offering,  the Company  shall enter into and  perform its  obligations  under an
underwriting  agreement,  in  usual  and  customary  form,  including,   without
limitation,  customary  indemnification and contribution  obligations,  with the
underwriters of such offering.

                  g. As promptly as  practicable  after  becoming  aware of such
event,  the Company  shall notify Legal  Counsel and each Investor in writing of
the  happening  of any event as a result of which the  prospectus  included in a
Registration  Statement,  as then in effect,  includes an untrue  statement of a
material fact or omission to state a material fact required to be stated therein
or necessary to make the statements therein, in light of the circumstances under
which they were made,  not  misleading,  and promptly  prepare a  supplement  or
amendment to such  Registration  Statement  to correct such untrue  statement or
omission,  and deliver ten (10) copies of such  supplement or amendment to Legal
Counsel and each  Investor (or such other  number of copies as Legal  Counsel or
such Investor may reasonably  request).  The Company shall also promptly  notify
Legal  Counsel  and  each  Investor  in  writing  (i) when a  prospectus  or any
prospectus  supplement or  post-effective  amendment has been filed,  and when a
Registration  Statement or any  post-effective  amendment  has become  effective
(notification of such effectiveness shall be delivered to Legal Counsel and each
Investor by  facsimile  on the same day of such  effectiveness  and by overnight

                                      -8-


mail),  (ii) of any  request  by the  SEC for  amendments  or  supplements  to a
Registration  Statement or related prospectus or related information,  and (iii)
of the Company's reasonable  determination that a post-effective  amendment to a
Registration Statement would be appropriate.

                  h. The  Company  shall use its best  efforts  to  prevent  the
issuance  of  any  stop  order  or  other   suspension  of  effectiveness  of  a
Registration  Statement,  or the suspension of the  qualification  of any of the
Registrable  Securities  for sale in any  jurisdiction  and, if such an order or
suspension  is issued,  to obtain the  withdrawal of such order or suspension at
the earliest  possible  moment and to notify Legal Counsel and each Investor who
holds  Registrable  Securities  being sold (and, in the event of an underwritten
offering,  the  managing  underwriters)  of the  issuance  of such order and the
resolution  thereof or its receipt of actual notice of the  initiation or threat
of any proceeding for such purpose.

                  i. At the request of any  Investor,  the Company shall furnish
to such Investor, on the date of the effectiveness of the Registration Statement
and  thereafter  from time to time on such dates as an Investor  may  reasonably
request (i) a letter, dated such date, from the Company's  independent certified
public  accountants in form and substance as is customarily given by independent
certified public accountants to underwriters in an underwritten public offering,
addressed to the  underwriters,  and (ii) an opinion,  dated as of such date, of
counsel representing the Company for purposes of such Registration Statement, in
form,  scope and substance as is  customarily  given in an  underwritten  public
offering, addressed to the Investors.

                  j. The Company shall make  available for inspection by (i) any
Buyer,  (ii)  Legal  Counsel,   (iii)  any  underwriter   participating  in  any
disposition pursuant to a Registration  Statement,  (iv) one firm of accountants
or  other  agents  retained  by the  Investors,  and (v) one  firm of  attorneys
retained by such  underwriters  (collectively,  the  "Inspectors") all pertinent
financial and other records, and pertinent corporate documents and properties of
the  Company  (collectively,  the  "Records"),  as  shall be  reasonably  deemed
necessary by each  Inspector,  and cause the Company's  officers,  directors and
employees to supply all information which any Inspector may reasonably  request;
provided,  however,  that each Inspector  shall agree to sign a  confidentiality
agreement covering the Records (in a form reasonably acceptable to the Company )
and shall hold in strict confidence and shall not make any disclosure (except to
an  Investor)  or use of any  Record  or other  information  which  the  Company
determines  in good faith to be  confidential,  and of which  determination  the
Inspectors  are so  notified,  unless  (a) the  disclosure  of such  Records  is
necessary  to avoid or correct a  misstatement  or omission in any  Registration
Statement or is otherwise  required  under the 1933 Act, (b) the release of such
Records is ordered pursuant to a final,  non-appealable subpoena or order from a
court or government  body of competent  jurisdiction,  or (c) the information in
such  Records  has been made  generally  available  to the public  other than by
disclosure  in violation of this or any other  agreement of which the  Inspector
has knowledge. Each Investor agrees that it shall, upon learning that disclosure
of such  Records is sought in or by a court or  governmental  body of  competent
jurisdiction or through other means, give prompt notice to the Company and allow
the  Company,  at its  expense,  to  undertake  appropriate  action  to  prevent
disclosure  of,  or to  obtain  a  protective  order  for,  the  Records  deemed
confidential.

                                      -9-



                  k.  The  Company  shall  hold in  confidence  and not make any
disclosure of information  concerning an Investor provided to the Company unless
(i) disclosure of such  information is necessary to comply with federal or state
securities  laws, (ii) the disclosure of such  information is necessary to avoid
or correct a misstatement or omission in any Registration  Statement,  (iii) the
release of such  information  is ordered  pursuant to a subpoena or other final,
non-appealable   order  from  a  court  or   governmental   body  of   competent
jurisdiction,  or (iv) such information has been made generally available to the
public other than by  disclosure  in  violation  of this  Agreement or any other
agreement.  The Company agrees that it shall,  upon learning that  disclosure of
such  information  concerning  an  Investor  is  sought  in  or  by a  court  or
governmental body of competent  jurisdiction or through other means, give prompt
written  notice to such  Investor  and allow such  Investor,  at the  Investor's
expense, to undertake  appropriate action to prevent disclosure of, or to obtain
a protective order for, such information.

                  l. The Company shall use its best efforts  either to (i) cause
all the Registrable  Securities covered by a Registration Statement to be listed
on each  securities  exchange  on which  securities  of the same class or series
issued  by the  Company  are  then  listed,  if  any,  if the  listing  of  such
Registrable  Securities is then permitted  under the rules of such exchange,  or
(ii) secure designation and quotation of all the Registrable  Securities covered
by the  Registration  Statement  on The  Nasdaq  National  Market  and,  without
limiting the  generality  of the  foregoing,  to arrange for at least two market
makers to register with the National  Association  of Securities  Dealers,  Inc.
("NASD") as such with respect to such Registrable Securities.  The Company shall
pay all fees and expenses in connection  with  satisfying its  obligation  under
this Section 3(l).

                  m. The Company  shall  cooperate  with the  Investors who hold
Registrable Securities being offered and, to the extent applicable, any managing
underwriter or underwriters,  to facilitate the timely  preparation and delivery
of  certificates   (not  bearing  any  restrictive   legend)   representing  the
Registrable  Securities to be offered  pursuant to a Registration  Statement and
enable such certificates to be in such denominations or amounts, as the case may
be, as the  managing  underwriter  or  underwriters,  if any, or, if there is no
managing  underwriter or underwriters,  the Investors may reasonably request and
registered in such names as the managing underwriter or underwriters, if any, or
the Investors may request.

                  n. The Company shall provide a transfer agent and registrar of
all such  Registrable  Securities  not  later  than the  effective  date of such
Registration Statement.

                  o. If requested by the managing  underwriters  or an Investor,
the Company  shall (i)  immediately  incorporate  in a prospectus  supplement or
post-effective  amendment such information as the managing  underwriters and the
Investors agree should be included therein relating to the sale and distribution
of Registrable  Securities,  including,  without  limitation,  information  with
respect to the number of Registrable Securities being sold to such underwriters,
the purchase price being paid therefor by such  underwriters and any other terms
of the underwritten (or best efforts  underwritten)  offering of the Registrable
Securities to be sold in such offering;  (ii) make all required  filings of such
prospectus  supplement  or  post-effective  amendment as soon as notified of the

                                      -10-


matters to be  incorporated  in such  prospectus  supplement  or  post-effective
amendment; and (iii) supplement or make amendments to any Registration Statement
if requested by a shareholder of such Registrable Securities.

                  p. The  Company  shall  use its  best  efforts  to  cause  the
Registrable  Securities covered by the applicable  Registration  Statement to be
registered with or approved by such other  governmental  agencies or authorities
as  may  be  necessary  to  consummate  the  disposition  of  such   Registrable
Securities.

                  q. The Company shall make generally  available to its security
holders as soon as practical,  but not later than 90 days after the close of the
period  covered  thereby,  an earnings  statement  (in form  complying  with the
provisions  of Rule 158 under  the 1933  Act)  covering  a  twelve-month  period
beginning  not later than the first day of the  Company's  fiscal  quarter  next
following the effective date of the Registration Statement.

                  r. The Company shall  otherwise use its best efforts to comply
with all  applicable  rules and  regulations  of the SEC in connection  with any
registration hereunder.

                  s.  Within  two  (2)  business  days  after  the  Registration
Statement which includes the Registrable  Securities is ordered effective by the
SEC, the Company shall deliver, and shall cause legal counsel for the Company to
deliver,  to the transfer agent for such Registrable  Securities (with copies to
the Investors  whose  Registrable  Securities are included in such  Registration
Statement)  confirmation  that the  Registration  Statement  has  been  declared
effective by the SEC in the form attached hereto as Exhibit A.

                  t. For each calendar quarter beginning in the quarter in which
the initial Registration Statement required to be filed pursuant to Section 2(a)
is  declared  effective  and  thereafter  so long as any  Preferred  Shares  are
outstanding,  the Company shall deliver (or cause its transfer agent to deliver)
to each Investor a written  report  notifying  the  Investors of any  occurrence
which  prohibits  the Company from issuing  Common Stock upon  conversion of the
Preferred  Shares.  The  report  shall  also  specify  (i) the  total  number of
Preferred Shares outstanding as of the end of the quarter, (ii) the total number
of shares of Common Stock issued upon all conversions of Preferred  Shares prior
to the end of the  quarter,  (iii)  the total  number of shares of Common  Stock
which are reserved for issuance upon  conversion  of the Preferred  Shares as of
the end of the  quarter,  and (iv) the total  number  of shares of Common  Stock
which may  thereafter be listed or issued by the Company upon  conversion of the
Preferred Shares before the Company would exceed the Exchange Cap (as defined in
the  Certificate  of  Designations).  The Company (or its transfer  agent) shall
deliver the report for each quarter to each  Investor  prior to the tenth day of
the  calendar  month  following  the  quarter  to which the report  relates.  In
addition,  the Company (or its  transfer  agent) shall  provide,  within 15 days
after  delivery to the Company of a written  request by an Investor,  any of the
information enumerated in clauses (i) - (iv) of this Section 3(t) as of the date
of the request.

                                      -11-



                  u.  The  Company  shall  take  all  other  reasonable  actions
necessary to expedite and facilitate disposition by the Investors of Registrable
Securities pursuant to a Registration Statement.

                  v.  Notwithstanding  anything to the contrary in Section 3(g),
at any time  after  the  applicable  Registration  Statement  has been  declared
effective  by the  SEC,  the  Company  may  delay  the  disclosure  of  material
non-public  information  concerning  the Company the  disclosure of which at the
time is not, in the good faith  opinion of the Board of Directors of the Company
and its  counsel,  in the best  interest of the  Company  and, in the opinion of
counsel to the Company,  otherwise required (a "Grace Period");  provided,  that
the Company shall  promptly (i) notify the Investors in writing of the existence
of material non-public  information giving rise to a Grace Period (provided that
in each  notice the  Company  will not  disclose  the  content of such  material
non-public  information to the Investors) and the date on which the Grace Period
will begin,  and (ii) notify the  Investors  in writing of the date on which the
Grace Period ends;  and,  provided  further,  that all Grace  Periods  shall not
exceed an  aggregate of 30 days in any  consecutive  365 day period with no more
than 15 consecutive days and during any consecutive 365 day period,  there shall
be an  aggregate  of not more  than  two  Grace  Periods  (an  "Allowable  Grace
Period").  For purposes of determining  the length of a Grace Period above,  the
Grace Period shall begin on and include the date the holders  receive the notice
referred to in clause (i) and shall end on and include the later of the date the
holders  receive the notice  referred to in clause (ii) and the date referred to
in such notice.  The  provisions  of Sections  2(g) and 3(h) hereof shall not be
applicable  during the period of any Allowable Grace Period.  Upon expiration of
the Grace  Period,  the Company  shall  again be bound by the first  sentence of
Section 3(g) with  respect to the  information  giving rise thereto  unless such
material non-public information is no longer applicable. In the event there is a
Grace Period,  the Maturity Date (as defined in the Certificate of Designations)
shall be delayed by two (2) days for each day in the Grace Period as provided in
the Certificate of Designations.

         4.       OBLIGATIONS OF THE INVESTORS.

                  a. At  least  seven  (7)  business  days  prior  to the  first
anticipated  filing date of a Registration  Statement,  the Company shall notify
each Investor in writing of the information the Company  requires from each such
Investor  if such  Investor  elects to have any of such  Investor's  Registrable
Securities  included  in such  Registration  Statement.  It shall be a condition
precedent  to the  obligations  of the  Company  to  complete  the  registration
pursuant to this  Agreement  with  respect to the  Registrable  Securities  of a
particular  Investor  that such  Investor  shall  furnish  to the  Company  such
information  regarding  itself,  the  Registrable  Securities held by it and the
intended method of disposition of the Registrable Securities held by it as shall
be reasonably required to effect the registration of such Registrable Securities
and shall execute such  documents in connection  with such  registration  as the
Company may reasonably request.

                  b.  Each  Investor,  by  such  Investor's  acceptance  of  the
Registrable  Securities,  agrees to  cooperate  with the  Company as  reasonably
requested by the Company in connection  with the  preparation  and filing of any

                                      -12-


Registration Statement hereunder,  unless such Investor has notified the Company
in  writing  of such  Investor's  election  to  exclude  all of such  Investor's
Registrable Securities from such Registration Statement.

                  c. In the  event any  Investor  elects  to  participate  in an
underwritten public offering pursuant to Section 2, each such Investor agrees to
enter  into and  perform  such  Investor's  obligations  under  an  underwriting
agreement, in usual and customary form, including, without limitation, customary
indemnification  and contribution  obligations  (only with respect to violations
which occur in reliance upon and in  conformity  with  information  furnished in
writing to the Company by such Investor  expressly  for use in the  Registration
Statement for such underwritten public offering),  with the managing underwriter
of such offering and take such other actions as are reasonably required in order
to expedite or facilitate the disposition of the Registrable Securities,  unless
such  Investor  notifies the Company in writing of such  Investor's  election to
exclude all of such Investor's  Registrable  Securities  from such  Registration
Statement.

                  d. Each Investor  agrees that, upon receipt of any notice from
the Company of the happening of any event of the kind  described in Section 3(h)
or the first  sentence  of 3(g),  such  Investor  will  immediately  discontinue
disposition of Registrable Securities pursuant to any Registration  Statement(s)
covering such Registrable Securities until such Investor's receipt of the copies
of the  supplemented or amended  prospectus  contemplated by Section 3(h) or the
first sentence of 3(g).  Notwithstanding  anything to the contrary,  the Company
shall cause its transfer agent to deliver unlegended shares of Common Stock to a
transferee of an Investor in  accordance  with the terms of the  Certificate  of
Designations in connection with any sale of Registrable  Securities with respect
to  which  an  Investor  has  entered  into a  contract  for  sale  prior to the
Investor's receipt of a notice from the Company of the happening of any event of
the kind  described in Section 3(h) or the first  sentence of 3(g) and for which
the Investor has not yet settled.

                  e.  No   Investor   may   participate   in  any   underwritten
registration  hereunder  unless such Investor (i) agrees to sell such Investor's
Registrable  Securities on the basis provided in any  underwriting  arrangements
approved by the Investors entitled hereunder to approve such arrangements,  (ii)
completes  and executes  all  questionnaires,  powers of attorney,  indemnities,
underwriting  agreements and other documents reasonably required under the terms
of such underwriting arrangements, and (iii) agrees to pay its pro rata share of
all underwriting discounts and commissions.


         5.       EXPENSES OF REGISTRATION.

                  All reasonable expenses, other than underwriting discounts and
commissions,   incurred   in   connection   with   registrations,   filings   or
qualifications pursuant to Sections 2 and 3, including,  without limitation, all
registration, listing and qualifications fees, printers and accounting fees, and
fees and  disbursements of counsel for the Company and fees and disbursements of
Legal Counsel,  shall be paid by the Company,  provided,  however,  the fees and
expenses of Legal  Counsel which the Company is required to pay pursuant to this
Section 5 shall not exceed, when aggregated with fees and expenses paid pursuant
to Section 4(i) of the Securities Purchase Agreement, $50,000.

                                      -13-



         6.       INDEMNIFICATION.

                  In the event any  Registrable  Securities  are  included  in a
Registration Statement under this Agreement:

                  a. To the fullest  extent  permitted by law, the Company will,
and hereby does,  indemnify,  hold  harmless and defend each  Investor who holds
such  Registrable  Securities,  the directors,  officers,  partners,  employees,
agents,  representatives  of, and each Person, if any, who controls any Investor
within the meaning of the 1933 Act or the  Securities  Exchange Act of 1934,  as
amended (the "1934 Act"),  and any  underwriter (as defined in the 1933 Act) for
the Investors,  and the directors and officers of, and each Person,  if any, who
controls,  any such  underwriter  within the meaning of the 1933 Act or the 1934
Act (each,  an  "Indemnified  Person"),  against  any losses,  claims,  damages,
liabilities,  judgments,  fines,  penalties,  charges,  costs,  attorneys' fees,
amounts  paid in  settlement  or  expenses,  joint  or  several,  (collectively,
"Claims") incurred in investigating,  preparing or defending any action,  claim,
suit, inquiry,  proceeding,  investigation or appeal taken from the foregoing by
or before any court or governmental,  administrative or other regulatory agency,
body or the SEC,  whether  pending or threatened,  whether or not an indemnified
party is or may be a party thereto ("Indemnified Damages"), to which any of them
may become subject  insofar as such Claims (or actions or  proceedings,  whether
commenced or threatened, in respect thereof) arise out of or are based upon: (i)
any  untrue  statement  or alleged  untrue  statement  of a  material  fact in a
Registration Statement or any post-effective  amendment thereto or in any filing
made in connection with the  qualification  of the offering under the securities
or other "blue sky" laws of any jurisdiction in which Registrable Securities are
offered  ("Blue Sky  Filing"),  or the  omission or alleged  omission to state a
material fact required to be stated  therein or necessary to make the statements
therein not misleading, (ii) any untrue statement or alleged untrue statement of
a material  fact  contained in any  preliminary  prospectus if used prior to the
effective  date  of such  Registration  Statement,  or  contained  in the  final
prospectus  (as  amended or  supplemented,  if the Company  files any  amendment
thereof or supplement  thereto with the SEC) or the omission or alleged omission
to state  therein  any  material  fact  necessary  to make the  statements  made
therein,  in light of the circumstances  under which the statements therein were
made, not misleading, (iii) any violation or alleged violation by the Company of
the 1933 Act, the 1934 Act, any other law, including,  without  limitation,  any
state securities law, or any rule or regulation thereunder relating to the offer
or sale of the Registrable  Securities  pursuant to a Registration  Statement or
(iv) any violation of this Agreement  (the matters in the foregoing  clauses (i)
through (iv) being,  collectively,  "Violations").  The Company shall  reimburse
each  Indemnified  Person promptly as such expenses are incurred and are due and
payable,  for any legal fees or other  reasonable  expenses  incurred by them in
connection  with  investigating  or  defending  any such Claim.  Notwithstanding
anything  to  the  contrary  contained  herein,  the  indemnification  agreement
contained in this Section 6(a): (i) shall not apply to a Claim by an Indemnified
Person  arising out of or based upon a Violation  which occurs in reliance  upon
and in conformity with  information  furnished in writing to the Company by such
Indemnified  Person or underwriter for such Indemnified Person expressly for use
in connection  with the  preparation of the  Registration  Statement or any such
amendment  thereof or supplement  thereto,  if such  prospectus  was timely made

                                      -14-


available  by the Company  pursuant to Section  3(d);  (ii) with  respect to any
preliminary  prospectus,  shall not inure to the benefit of any such person from
whom the person  asserting any such Claim purchased the  Registrable  Securities
that are the subject thereof (or to the benefit of any person  controlling  such
person) if the untrue  statement or omission of material  fact  contained in the
preliminary  prospectus  was  corrected  in the  prospectus,  as then amended or
supplemented,  if such  prospectus  was timely  made  available  by the  Company
pursuant to Section 3(d),  and the  Indemnified  Person was promptly  advised in
writing not to use the  incorrect  prospectus  prior to the use giving rise to a
violation and such Indemnified  Person,  notwithstanding  such advice,  used it;
(iii) shall not be  available  to the extent such Claim is based on a failure of
the  Investor  to  deliver  or to  cause to be  delivered  the  prospectus  made
available by the Company,  if such  prospectus  was timely made available by the
Company  pursuant to Section  3(d);  and (iv) shall not apply to amounts paid in
settlement of any Claim if such settlement is effected without the prior written
consent of the Company, which consent shall not be unreasonably  withheld.  Such
indemnity shall remain in full force and effect  regardless of any investigation
made by or on behalf of the Indemnified Person and shall survive the transfer or
disposition of the Registrable Securities by the Investors.

                  b. In connection with any  Registration  Statement in which an
Investor  is  participating,  each such  Investor  agrees to  severally  and not
jointly indemnify,  hold harmless and defend, to the same extent and in the same
manner as is set forth in Section 6(a), the Company, each of its directors, each
of its officers who signs the Registration  Statement,  each Person, if any, who
controls  the  Company  within  the  meaning  of the  1933  Act or the  1934 Act
(collectively and together with an Indemnified Person, an "Indemnified  Party"),
against  any  Claim  or  Indemnified  Damages  to which  any of them may  become
subject, under the 1933 Act, the 1934 Act or otherwise, insofar as such Claim or
Indemnified  Damages arise out of or are based upon any Violation,  in each case
to the extent,  and only to the extent,  that such Violation  occurs in reliance
upon and in conformity with written information furnished to the Company by such
Investor expressly for use in connection with such Registration Statement;  and,
subject  to  Section  6(d),  such  Investor  will  reimburse  any legal or other
expenses  reasonably  incurred  by  them in  connection  with  investigating  or
defending  any such  Claim;  provided,  however,  that the  indemnity  agreement
contained in this Section 6(b) and the  agreement  with respect to  contribution
contained  in Section 7 shall not apply to  amounts  paid in  settlement  of any
Claim if such  settlement is effected  without the prior written consent of such
Investor, which consent shall not be unreasonably withheld;  provided,  further,
however, that the Investor shall be liable under this Section 6(b) for only that
amount of a Claim or Indemnified  Damages as does not exceed the net proceeds to
such Investor as a result of the sale of Registrable Securities pursuant to such
Registration  Statement.  Such  indemnity  shall remain in full force and effect
regardless of any  investigation  made by or on behalf of such Indemnified Party
and shall  survive the transfer of the  Registrable  Securities by the Investors
pursuant  to Section  9.  Notwithstanding  anything  to the  contrary  contained
herein,  the  indemnification  agreement  contained  in this  Section  6(b) with
respect  to any  preliminary  prospectus  shall not inure to the  benefit of any
Indemnified Party if the untrue statement or omission of material fact contained
in the preliminary prospectus was corrected on a timely basis in the prospectus,
as then amended or supplemented.

                                      -15-



                  c. The Company shall be entitled to receive  indemnities  from
underwriters,  selling brokers,  dealer managers and similar securities industry
professionals participating in any distribution,  to the same extent as provided
above,  with  respect  to  information  such  persons  so  furnished  in writing
expressly for inclusion in the Registration Statement.

                  d.  Promptly  after  receipt  by  an  Indemnified   Person  or
Indemnified  Party  under this  Section 6 of notice of the  commencement  of any
action or proceeding (including any governmental action or proceeding) involving
a Claim,  such  Indemnified  Person or  Indemnified  Party shall,  if a Claim in
respect thereof is to be made against any indemnifying  party under this Section
6,  deliver  to the  indemnifying  party a written  notice  of the  commencement
thereof, and the indemnifying party shall have the right to participate in, and,
to the  extent  the  indemnifying  party so  desires,  jointly  with  any  other
indemnifying party similarly  noticed,  to assume control of the defense thereof
with counsel mutually satisfactory to the indemnifying party and the Indemnified
Person or the Indemnified Party, as the case may be; provided,  however, that an
Indemnified  Person or Indemnified  Party shall have the right to retain its own
counsel with the fees and expenses to be paid by the indemnifying  party, if, in
the  reasonable  opinion of counsel  retained  by the  indemnifying  party,  the
representation  by such counsel of the Indemnified  Person or Indemnified  Party
and the  indemnifying  party would be  inappropriate  due to actual or potential
differing interests between such Indemnified Person or Indemnified Party and any
other party  represented by such counsel in such  proceeding.  The Company shall
pay reasonable  fees for only one separate legal counsel for the Investors,  and
such legal  counsel  shall be  selected by the  Investors  holding a majority in
interest of the Registrable Securities included in the Registration Statement to
which the Claim  relates.  The  Indemnified  Party or  Indemnified  Person shall
cooperate fully with the  indemnifying  party in connection with any negotiation
or  defense  of any such  action  or claim by the  indemnifying  party and shall
furnish to the indemnifying  party all information  reasonably  available to the
Indemnified  Party or Indemnified  Person which relates to such action or claim.
The indemnifying  party shall keep the Indemnified  Party or Indemnified  Person
fully  apprised at all times as to the status of the  defense or any  settlement
negotiations with respect thereto. No indemnifying party shall be liable for any
settlement  of any  action,  claim or  proceeding  effected  without its written
consent,  provided,  however, that the indemnifying party shall not unreasonably
withhold,  delay or condition its consent. No indemnifying party shall,  without
the consent of the Indemnified Party or Indemnified Person,  consent to entry of
any judgment or enter into any  settlement  or other  compromise  which does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party or Indemnified  Person of a release from all liability
in respect to such claim or litigation.  Following  indemnification  as provided
for hereunder,  the indemnifying  party shall be subrogated to all rights of the
Indemnified Party or Indemnified Person with respect to all third parties, firms
or corporations  relating to the matter for which indemnification has been made.
The  failure  to  deliver  written  notice to the  indemnifying  party  within a
reasonable  time of the  commencement  of any such action shall not relieve such
indemnifying  party of any liability to the  Indemnified  Person or  Indemnified
Party under this Section 6, except to the extent that the indemnifying  party is
prejudiced in its ability to defend such action.

                                      -16-



                  e. The  indemnification  required  by this  Section 6 shall be
made by  periodic  payments  of the  amount  thereof  during  the  course of the
investigation or defense,  as and when bills are received or Indemnified Damages
are incurred.

                  f.  The  indemnity  agreements  contained  herein  shall be in
addition to (i) any cause of action or similar right of the Indemnified Party or
Indemnified  Person  against  the  indemnifying  party or  others,  and (ii) any
liabilities the indemnifying party may be subject to pursuant to the law.

         7.       CONTRIBUTION.

                  To the extent any  indemnification by an indemnifying party is
prohibited or limited by law, the indemnifying  party agrees to make the maximum
contribution  with respect to any amounts for which it would otherwise be liable
under Section 6 to the fullest extent permitted by law; provided, however, that:
(i) no seller of Registrable  Securities guilty of fraudulent  misrepresentation
(within  the  meaning of Section  11(f) of the 1933 Act)  shall be  entitled  to
contribution  from any seller of  Registrable  Securities  who was not guilty of
fraudulent misrepresentation; and (ii) contribution by any seller of Registrable
Securities shall be limited in amount to the net amount of proceeds  received by
such seller from the sale of such Registrable Securities.

         8.       REPORTS UNDER THE 1934 ACT.

                  As long as any  Preferred  Shares  or  Registrable  Securities
remain  outstanding,  the  Company,  with  a view  to  making  available  to the
Investors the benefits of Rule 144  promulgated  under the 1933 Act or any other
similar rule or  regulation of the SEC that may at any time permit the Investors
to sell  securities  of the Company to the public  without  registration  ("Rule
144"), agrees to use its best efforts to:

                  a. make and keep public information  available, as those terms
are understood and defined in Rule 144;

                  b. file with the SEC in a timely  manner all reports and other
documents required of the Company under the 1933 Act and the 1934 Act so long as
the Company  remains  subject to such  requirements  (it being  understood  that
nothing herein shall limit the Company's  obligations  under Section 4(c) of the
Securities  Purchase  Agreement)  and the  filing  of  such  reports  and  other
documents is required for the applicable provisions of Rule 144; and

                  c.  furnish to each  Investor  so long as such  Investor  owns
Registrable  Securities,  promptly upon request,  (i) a written statement by the
Company that it has complied  with the reporting  requirements  of Rule 144, the
1933 Act and the 1934 Act,  (ii) a copy of the most recent  annual or  quarterly
report of the  Company  and such other  reports  and  documents  so filed by the
Company,  and (iii) such other  information  as may be  reasonably  requested to
permit  the  Investors  to sell such  securities  pursuant  to Rule 144  without
registration.

                                      -17-



         9.       ASSIGNMENT OF REGISTRATION RIGHTS.

                  The  rights  under  this  Agreement  shall  be   automatically
assignable  by the  Investors  to any  transferee  of  all  or  any  portion  of
Registrable  Securities  if:  (i)  the  Investor  agrees  in  writing  with  the
transferee  or assignee to assign such rights,  and a copy of such  agreement is
furnished to the Company within a reasonable  time after such  assignment;  (ii)
the Company is,  within a  reasonable  time after such  transfer or  assignment,
furnished with written notice of (a) the name and address of such  transferee or
assignee,  and (b) the securities with respect to which such registration rights
are being transferred or assigned;  (iii) immediately following such transfer or
assignment  the further  disposition  of such  securities  by the  transferee or
assignee is restricted  under the 1933 Act and applicable state securities laws;
(iv) at or before the time the Company receives the written notice  contemplated
by clause (ii) of this  sentence the  transferee  or assignee  agrees in writing
with the Company to be bound by all of the provisions  contained herein; and (v)
such  transfer   shall  have  been  made  in  accordance   with  the  applicable
requirements of the Securities Purchase Agreement.

         10.      AMENDMENT OF REGISTRATION RIGHTS.

                  Provisions of this Agreement may be amended and the observance
     thereof may be waived  (either  generally or in a  particular  instance and
either  retroactively  or  prospectively),  only with the written consent of the
Company and Investors who then hold  two-thirds of the  Registrable  Securities.
Any  amendment or waiver  effected in  accordance  with this Section 10 shall be
binding upon each Investor and the Company. No such amendment shall be effective
to the extent that it applies to less than all of the holders of the Registrable
Securities.  No consideration shall be offered or paid to any Person to amend or
consent to a waiver or  modification  of any provision of any of this  Agreement
unless the same  consideration  also is  offered  to all of the  parties to this
Agreement.


         11.      MISCELLANEOUS.

                  a. A Person is deemed to be a holder of Registrable Securities
whenever  such  Person  owns or is  deemed  to own of  record  such  Registrable
Securities.  If  the  Company  receives  conflicting  instructions,  notices  or
elections  from  two or  more  Persons  with  respect  to the  same  Registrable
Securities,  the  Company  shall act upon the basis of  instructions,  notice or
election received from the registered owner of such Registrable Securities.

                                      -18-



                  b. Any  notices,  consents,  waivers  or other  communications
required or permitted to be given under the terms of this  Agreement  must be in
writing  and will be deemed  to have  been  delivered:  (i) upon  receipt,  when
delivered  personally;  (ii)  upon  receipt,  when sent by  facsimile  (provided
confirmation of transmission  is  mechanically or  electronically  generated and
kept on file by the sending party); or (iii) one business day after deposit with
a  nationally  recognized  overnight  delivery  service,  in each case  properly
addressed to the party to receive the same. The addresses and facsimile  numbers
for such communications shall be:

                  If to the Company:

                           Immunomedics, Inc.
                           300 American Road
                           Morris Plains, New Jersey 07950
                           Telephone: (973) 605-8200
                           Facsimile: (973) 605-8311
                           Attention:  President

                  With a copy to:

                           Warshaw Burstein Cohen Schlesinger & Kuh, LLP
                           555 Fifth Avenue
                           New York, New York 10017
                           Telephone: (212) 984-7832
                           Facsimile: (212) 984-7893
                           Attention: Michael D. Schwamm, Esq.


If to a Investor,  to it at the address  and  facsimile  number set forth on the
Schedule  of  Investors   attached  hereto,   with  copies  to  such  Investor's
representatives  as set forth on the  Schedule  of  Investors,  or at such other
address and/or  facsimile number and/or to the attention of such other person as
the recipient  party has  specified by written  notice given to each other party
five days prior to the  effectiveness  of such change.  Written  confirmation of
receipt (A) given by the  recipient  of such  notice,  consent,  waiver or other
communication,  (B)  mechanically  or  electronically  generated by the sender's
facsimile machine containing the time, date,  recipient  facsimile number and an
image of the first page of such  transmission  or (C)  provided by a  nationally
recognized  overnight delivery service shall be rebuttable  evidence of personal
service,  receipt by facsimile or receipt from a nationally recognized overnight
delivery   service  in  accordance   with  clause  (i),  (ii)  or  (iii)  above,
respectively.

                  c.  Failure of any party to exercise any right or remedy under
this  Agreement or otherwise,  or delay by a party in  exercising  such right or
remedy, shall not operate as a waiver thereof.

                                      -19-



                  d. The  corporate  laws of the State of Delaware  shall govern
all issues  concerning the relative rights of the Company and its  stockholders.
All other  questions  concerning the  construction,  validity,  enforcement  and
interpretation  of this Agreement  shall be governed by the internal laws of the
State of New York, without giving effect to any choice of law or conflict of law
provision or rule (whether of the State of New York or any other  jurisdictions)
that would cause the application of the laws of any jurisdictions other than the
State of New York. Each party hereby  irrevocably  submits to the  non-exclusive
jurisdiction  of the  state and  federal  courts  sitting  the City of New York,
borough of  Manhattan,  for the  adjudication  of any  dispute  hereunder  or in
connection  herewith or with any  transaction  contemplated  hereby or discussed
herein,  and hereby  irrevocably  waives,  and agrees not to assert in any suit,
action  or  proceeding,  any  claim  that it is not  personally  subject  to the
jurisdiction of any such court,  that such suit, action or proceeding is brought
in an inconvenient forum or that the venue of such suit, action or proceeding is
improper.  Each party hereby  irrevocably waives personal service of process and
consents  to process  being  served in any such suit,  action or  proceeding  by
mailing a copy thereof to such party at the address for such notices to it under
this Agreement and agrees that such service shall constitute good and sufficient
service of process and notice thereof.  Nothing contained herein shall be deemed
to limit in any way any right to serve  process in any manner  permitted by law.
If any  provision of this  Agreement  shall be invalid or  unenforceable  in any
jurisdiction,  such invalidity or unenforceability shall not affect the validity
or enforceability of the remainder of this Agreement in that jurisdiction or the
validity or  enforceability  of any  provision  of this  Agreement  in any other
jurisdiction.

                  e. This Agreement,  the Securities  Purchase Agreement and the
Certificate of  Designations  constitute the entire  agreement among the parties
hereto  with  respect to the subject  matter  hereof and  thereof.  There are no
restrictions,  promises, warranties or undertakings,  other than those set forth
or referred to herein and  therein.  This  Agreement,  the  Securities  Purchase
Agreement and the Certificate of Designations supersede all prior agreements and
understandings  among the  parties  hereto with  respect to the  subject  matter
hereof and thereof.

                  f. Subject to the  requirements  of Section 9, this  Agreement
shall inure to the benefit of and be binding upon the permitted  successors  and
assigns of each of the parties hereto.

                  g. The  headings  in this  Agreement  are for  convenience  of
reference only and shall not limit or otherwise affect the meaning hereof.

                  h. This  Agreement may be executed in identical  counterparts,
each of which shall be deemed an original but all of which shall  constitute one
and the same  agreement.  This  Agreement,  once  executed  by a  party,  may be
delivered to the other party hereto by facsimile  transmission of a copy of this
Agreement bearing the signature of the party so delivering this Agreement.

                  i. Each party  shall do and  perform,  or cause to be done and
performed,  all such further acts and things,  and shall execute and deliver all
such other  agreements,  certificates,  instruments and documents,  as the other

                                      -20-


party may reasonably request in order to carry out the intent and accomplish the
purposes of this Agreement and the consummation of the transactions contemplated
hereby.

                  j. All  consents  and other  determinations  to be made by the
Investors  pursuant to this Agreement shall be made, unless otherwise  specified
in  this  Agreement,   by  Investors  holding  a  majority  of  the  Registrable
Securities,  determined as if all of the Preferred  Shares then outstanding have
been converted into Registrable  Securities  without regard to any limitation on
conversions of Preferred Shares.

                  k. The language  used in this  Agreement  will be deemed to be
the language  chosen by the parties to express  their mutual intent and no rules
of strict construction will be applied against any party.

                  l. This  Agreement  is intended for the benefit of the parties
hereto and their respective permitted successors and assigns, and is not for the
benefit of, nor may any provision hereof be enforced by, any other Person.

                                   * * * * * *

                                      -21-





         IN WITNESS WHEREOF,  the parties have caused this  Registration  Rights
Agreement to be duly executed as of day and year first above written.

COMPANY:                              BUYERS:

IMMUNOMEDICS, INC.                    HFTP INVESTMENT LLC

                                      By:        PROMETHEAN           INVESTMENT
GROUP, By:                                          L.L.C.
Name:       Robert J. DeLuccia 
Its:        President & Chief         Its:       Investment Manager
            Executive Officer
            
                                      By:
                                      Name:      James F. O'Brien, Jr.
                                      Its:       Managing Member

                                      WINGATE CAPITAL LTD.

                                      By:
                                      Name:      Kenneth A. Simpler
                                      Its:       Vice President

                                      FISHER CAPITAL LTD.

                                      By:
                                      Name:      Kenneth A. Simpler
                                      Its:       Vice President

                                      LEONARDO, L.P.

                                      By:        ANGELO, GORDON & CO. L.P.
                                      Its:       General Partner

                                      By:
                                      Name:      Michael L. Gordon
                                      Its:       Chief Operating Officer

                                      GAM ARBITRAGE INVESTMENTS, INC.

                                      By:        ANGELO, GORDON & CO. L.P.
                                      Its:       Investment Advisor

                                      By:
                                      Name:      Michael L. Gordon
                                      Its:       Chief Operating Officer

                                      -22-



                                      AG SUPER FUND INTERNATIONAL PARTNERS, L.P.

                                      By:        ANGELO, GORDON & CO., L.P.
                                      Its:       General Partner

                                      By:
                                      Name:      Michael L. Gordon
                                      Its:       Chief Operating Officer

                                      RAPHAEL, L.P.


                                      By:
                                      Name:      Michael L. Gordon
                                      Its:       Chief Operating Officer

                                      RAMIUS FUND, LTD.

                                      By:        AG RAMIUS PARTNERS, L.L.C.
                                      Its:       Investment Advisor

                                      By:
                                      Name:      Michael L. Gordon
                                      Its:       Managing Officer


                                      -23-



                              SCHEDULE OF INVESTORS



- -------------------------------------------------------------------------------------------------------------------
                                                                        
                                           Investor's Address                  Investor's Representatives'
Investor Name                             and Facsimile Number                Address and Facsimile Number
- -------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------


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

HFTP Investment LLC                  c/o Promethean Investment Group,          Promethean Investment Group, L.L.C.
                                     L.L.C.                                    40 West 57th Street, Suite 1520
                                     40 West 57th Street, Suite 1520           New York, New York 10019
                                     New York, New York 10019                  Attention: James F. O'Brien, Jr.
                                     Attention: James F. O'Brien, Jr.          Facsimile: (212) 698-0505
                                     Facsimile: (212) 698-0505                 Telephone: (212) 698-0588
                                     Telephone: (212) 698-0588
                                                                               Katten Muchin & Zavis
                                                                               525 West Monroe Street, Suite 1600
                                                                               Chicago, Illinois 60661-3693
                                                                               Attention: Robert J. Brantman, Esq.
                                                                               Facsimile: (312) 902-1061
                                                                               Telephone: (312) 902-5200
- -------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------

Wingate Capital Ltd.                 Citadel Investment Group, L.L.C.          Citadel Investment Group, L.L.C.
                                     225 West Washington Street                225 West Washington Street
                                     Chicago, Illinois  60606                  Chicago, Illinois  60606
                                     Attention: Daniel Hopkins                 Attention: Daniel Hopkins
                                     Facsimile: (312) 338-0780                 Facsimile: (312) 338-0780
                                     Telephone: (312) 338-7803                 Telephone: (312) 338-7803

                                                                               Katten Muchin & Zavis
                                                                               525 West Monroe Street, Suite 1600
                                                                               Chicago, Illinois 60661-3693
                                                                               Attention: Robert J. Brantman, Esq.
                                                                               Facsimile: (312) 902-1061
                                                                               Telephone: (312) 902-5200
- -------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------

Fisher Capital Ltd.                  Citadel Investment Group, L.L.C.          Citadel Investment Group, L.L.C.
                                     225 West Washington Street                225 West Washington Street
                                     Chicago, Illinois  60606                  Chicago, Illinois  60606
                                     Attention: Daniel Hopkins                 Attention: Daniel Hopkins
                                     Facsimile: (312) 338-0780                 Facsimile: (312) 338-0780
                                     Telephone: (312) 338-7803                 Telephone: (312) 338-7803

                                                                               Katten Muchin & Zavis
                                                                               525 West Monroe Street, Suite 1600
                                                                               Chicago, Illinois 60661-3693
                                                                               Attention: Robert J. Brantman, Esq.
                                                                               Facsimile: (312) 902-1061
                                                                               Telephone: (312) 902-5200
- -------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------

Leonardo, L.P.                       c/o Angelo, Gordon & Co., L.P.            Angelo, Gordon & Co., L.P.
                                     245 Park Avenue - 26th Floor              245 Park Avenue - 26th Floor
                                     New York, New York 10167                  New York, New York 10167
                                     Attention: Gary Wolf or Ari Storch        Attention: Gary Wolf or Ari Storch
                                     Facsimile: (212) 867-6449                 Facsimile: (212) 867-6449
                                     Telephone: (212) 692-2035                 Telephone: (212) 692-2035

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

                                      -24-


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

GAM Arbitrage Investments, Inc.      c/o Angelo, Gordon & Co., L.P.            Angelo, Gordon & Co., L.P.
                                     245 Park Avenue - 26th Floor              245 Park Avenue - 26th Floor
                                     New York, New York 10167                  New York, New York 10167
                                     Attention: Gary Wolf or Ari Storch        Attention: Gary Wolf or Ari Storch
                                     Facsimile: (212) 867-6449                 Facsimile: (212) 867-6449
                                     Telephone: (212) 692-2035                 Telephone: (212) 692-2035

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

AG Super Fund International          c/o Angelo, Gordon & Co., L.P.            Angelo, Gordon & Co., L.P.
Partners, L.P.                       245 Park Avenue - 26th Floor              245 Park Avenue - 26th Floor
                                     New York, New York 10167                  New York, New York 10167
                                     Attention: Gary Wolf or Ari Storch        Attention: Gary Wolf or Ari Storch
                                     Facsimile: (212) 867-6449                 Facsimile: (212) 867-6449
                                     Telephone: (212) 692-2035                 Telephone: (212) 692-2035

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

Raphael, L.P.                        c/o Angelo, Gordon & Co., L.P.            Angelo, Gordon & Co., L.P.
                                     245 Park Avenue - 26th Floor              245 Park Avenue - 26th Floor
                                     New York, New York 10167                  New York, New York 10167
                                     Attention: Gary Wolf or Ari Storch        Attention: Gary Wolf or Ari Storch
                                     Facsimile: (212) 867-6449                 Facsimile: (212) 867-6449
                                     Telephone: (212) 692-2035                 Telephone: (212) 692-2035

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

Ramius Fund, Ltd.                    c/o Angelo, Gordon & Co., L.P.            Angelo, Gordon & Co., L.P.
                                     245 Park Avenue - 26th Floor              245 Park Avenue - 26th Floor
                                     New York, New York 10167                  New York, New York 10167
                                     Attention: Gary Wolf or Ari Storch        Attention: Gary Wolf or Ari Storch
                                     Facsimile: (212) 867-6449                 Facsimile: (212) 867-6449
                                     Telephone: (212) 692-2035                 Telephone: (212) 692-2035

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


                                      -25-



                                                                       EXHIBIT A
                         FORM OF NOTICE OF EFFECTIVENESS
                            OF REGISTRATION STATEMENT



Attn:                               

                  Re:      Immunomedics, Inc.

Ladies and Gentlemen:

         We are  counsel to  Immunomedics,  Inc.,  a Delaware  corporation  (the
"Company"),  and have  represented  the Company in connection  with that certain
Securities  Purchase  Agreement (the "Purchase  Agreement")  entered into by and
among the Company and the buyers named  therein  (collectively,  the  "Holders")
pursuant  to which the  Company  issued to the  Holders  shares of its  Series F
Convertible Preferred Shares, par value $.01 per share, (the "Preferred Shares")
convertible  into shares of the Company's common stock, par value $.01 per share
(the "Common Stock").  Pursuant to the Purchase Agreement,  the Company also has
entered into a Registration Rights Agreement with the Holders (the "Registration
Rights Agreement")  pursuant to which the Company agreed, among other things, to
register  the  Registrable  Securities  (as defined in the  Registration  Rights
Agreement), including the shares of Common Stock issuable upon conversion of the
Preferred  Shares under the Securities Act of 1933, as amended (the "1933 Act").
In  connection  with the Company's  obligations  under the  Registration  Rights
Agreement, on ____________ ___, 1998, the Company filed a Registration Statement
on Form S-3 (File No. 333-_____________) (the "Registration Statement") with the
Securities  and  Exchange  Commission  (the "SEC")  relating to the  Registrable
Securities which names each of the Holders as a selling stockholder thereunder.

         In connection  with the  foregoing,  we advise you that a member of the
SEC's  staff has  advised  us by  telephone  that the SEC has  entered  an order
declaring the Registration Statement effective under the 1933 Act at [ENTER TIME
OF  EFFECTIVENESS]  on [ENTER DATE OF  EFFECTIVENESS]  and we have no knowledge,
after  telephonic  inquiry of a member of the SEC's  staff,  that any stop order
suspending its  effectiveness  has been issued or that any  proceedings for that
purpose  are  pending  before,  or  threatened  by, the SEC and the  Registrable
Securities  are  available  for  resale  under  the  1933  Act  pursuant  to the
Registration Statement.

                                                      Very truly yours,

                                                      [ISSUER'S COUNSEL]


                                                      By:
cc:      [LIST NAMES OF HOLDERS]