1
                                                                     EXHIBIT 3.5

                                     BYLAWS

                                       OF

                          COULTER PHARMACEUTICAL, INC.
                            (A DELAWARE CORPORATION)




   2

                                TABLE OF CONTENTS



                                                                                                               PAGE
                                                                                                               ----
                                                                                                              
         ARTICLE I

                                                      OFFICES...................................................  1
                  Section 1.        Registered Office...........................................................  1
                  Section 2.        Other Offices...............................................................  1

         ARTICLE II

                                                  CORPORATE SEAL................................................  1
                  Section 3.        Corporate Seal..............................................................  1

         ARTICLE III

                                              STOCKHOLDERS' MEETINGS............................................  1
                  Section 4.        Place of Meetings...........................................................  1
                  Section 5.        Annual Meeting..............................................................  2
                  Section 6.        Special Meetings............................................................  3
                  Section 7.        Notice of Meetings..........................................................  4
                  Section 8.        Quorum......................................................................  4
                  Section 9.        Adjournment and Notice of Adjourned Meetings................................  5
                  Section 10.       Voting Rights...............................................................  5
                  Section 11.       Beneficial Owners of Stock..................................................  5
                  Section 12.       List of Stockholders........................................................  6
                  Section 13.       Action without Meeting......................................................  6
                  Section 14.       Organization................................................................  7

         ARTICLE IV

                                                     DIRECTORS..................................................  7
                  Section 15.       Number and Term of Office...................................................  7
                  Section 16.       Powers......................................................................  8
                  Section 17.       Vacancies...................................................................  8
                  Section 18.       Resignation.................................................................  8
                  Section 19.       Removal.....................................................................  8
                  Section 20.       Meetings....................................................................  8
                          (a)      Annual Meetings..............................................................  8
                          (b)      Regular Meetings.............................................................  9
                          (c)      Special Meetings.............................................................  9
                          (d)      Telephone Meetings...........................................................  9
                          (e)      Notice of Meetings...........................................................  9
                          (f)      Waiver of Notice.............................................................  9


                                       i.

   3


                                TABLE OF CONTENTS
                                   (CONTINUED)



                                                                                                               PAGE
                                                                                                               ----
                                                                                                              
                  Section 21.       Quorum and Voting...........................................................  9
                  Section 22.       Action without Meeting...................................................... 10
                  Section 23.       Fees and Compensation....................................................... 10
                  Section 24.       Committees.................................................................. 10
                          (a)       Executive Committee......................................................... 10
                          (b)       Other Committees............................................................ 10
                          (c)       Term........................................................................ 11
                          (d)       Meetings.................................................................... 11
                  Section 25.       Organization................................................................ 11

         ARTICLE V

                                                     OFFICERS................................................... 12
                  Section 26.       Officers Designated......................................................... 12
                  Section 27.       Tenure and Duties of Officers............................................... 12
                          (a)       General..................................................................... 12
                          (b)       Duties of Chairman of the Board of Directors................................ 12
                          (c)       Duties of President......................................................... 12
                          (d)       Duties of Vice Presidents................................................... 12
                          (e)       Duties of Secretary......................................................... 13
                          (f)       Duties of Chief Financial Officer or Treasurer.............................. 13
                  Section 28.       Delegation of Authority..................................................... 13
                  Section 29.       Resignations................................................................ 13
                  Section 30.       Removal..................................................................... 13

         ARTICLE VI

                                   EXECUTION OF CORPORATE INSTRUMENTS AND
                                   VOTING OF SECURITIES OWNED BY THE CORPORATION................................ 14
                  Section 31.       Execution of Corporate Instruments.......................................... 14
                  Section 32.       Voting of Securities Owned by the Corporation............................... 14

         ARTICLE VII

                                                  SHARES OF STOCK............................................... 15
                  Section 33.       Form and Execution of Certificates.......................................... 15
                  Section 34.       Lost Certificates........................................................... 15
                  Section 35.       Transfers................................................................... 15
                  Section 36.       Fixing Record Dates......................................................... 16


                                       ii.

   4

                                TABLE OF CONTENTS
                                   (CONTINUED)



                                                                                                               PAGE
                                                                                                               ----
                                                                                                             
                  Section 37.       Registered Stockholders..................................................... 16

         ARTICLE VIII

                                        OTHER SECURITIES OF THE CORPORATION..................................... 17
                  Section 38.       Execution of Other Securities............................................... 17

         ARTICLE IX

                                                     DIVIDENDS.................................................. 17
                  Section 39.       Declaration of Dividends.................................................... 17
                  Section 40.       Dividend Reserve............................................................ 17

         ARTICLE X

                                                    FISCAL YEAR................................................. 18
                  Section 41.       Fiscal Year................................................................. 18

         ARTICLE XI

                                                  INDEMNIFICATION............................................... 18
                  Section 42.       Indemnification of Directors, Officers, Employees and Other
                                    Agents...................................................................... 18
                          (a)      Directors.................................................................... 18
                          (b)      Officers, Employees and Other Agents......................................... 18
                          (c)      Good Faith................................................................... 18
                          (d)      Expenses..................................................................... 19
                          (e)      Enforcement.................................................................. 19
                          (f)      Non-Exclusivity of Rights.................................................... 20
                          (g)      Survival of Rights........................................................... 20
                          (h)      Insurance.................................................................... 20
                          (i)      Amendments................................................................... 20
                          (j)      Saving Clause................................................................ 20
                          (k)      Certain Definitions.......................................................... 20

         ARTICLE XII

                                                      NOTICES................................................... 21
                  Section 43.       Notices..................................................................... 21


                                      iii.

   5


                                                                                                              
                          (a)       Notice to Stockholders...................................................... 21
                          (b)       Notice to Directors......................................................... 22
                          (c)       Address Unknown............................................................. 22
                          (d)       Affidavit of Mailing........................................................ 22
                          (e)       Time Notices Deemed Given................................................... 22
                          (f)       Methods of Notice........................................................... 22
                          (g)       Failure to Receive Notice................................................... 22
                          (h)       Notice to Person with Whom Communication Is Unlawful........................ 22
                          (i)       Notice to Person with Undeliverable Address................................. 23

         ARTICLE XIII

                                                    AMENDMENTS.................................................. 23
                  Section 44.       Amendments.................................................................. 23

         ARTICLE XV

                                                 LOANS TO OFFICERS.............................................. 23
                  Section 45.       Loans to Officers........................................................... 23

         ARTICLE XVI

                                                   MISCELLANEOUS................................................ 24
                  Section 46.       Annual Report............................................................... 24


                                      iv.

   6

                                     BYLAWS

                                       OF

                          COULTER PHARMACEUTICAL, INC.

                            (A DELAWARE CORPORATION)



                                    ARTICLE I

                                     OFFICES

         SECTION 1. REGISTERED OFFICE. The registered office of the corporation
in the State of Delaware shall be in the City of Dover, County of Kent.

         SECTION 2. OTHER OFFICES. The corporation shall also have and maintain
an office or principal place of business, at such place as may be fixed by the
Board of Directors, and may also have offices at such other places, both within
and without the State of Delaware as the Board of Directors may from time to
time determine or the business of the corporation may require.


                                   ARTICLE II

                                 CORPORATE SEAL

         SECTION 3. CORPORATE SEAL. The corporate seal, if adopted by the Board
of Directors, shall consist of a die bearing the name of the corporation and the
inscription, "Corporate Seal-Delaware." Said seal may be used by causing it or a
facsimile thereof to be impressed or affixed or reproduced or otherwise.


                                   ARTICLE III

                             STOCKHOLDERS' MEETINGS

         SECTION 4. PLACE OF MEETINGS. Meetings of the stockholders of the
corporation shall be held at such place, either within or without the State of
Delaware, as may be designated from time to time by the Board of Directors, or,
if not so designated, then at the office of the corporation required to be
maintained pursuant to Section 2 hereof.



                                       1.
   7

         SECTION 5. ANNUAL MEETING.

                (a) The annual meeting of the stockholders of the corporation,
for the purpose of election of Directors and for such other business as may
lawfully come before it, shall be held on such date and at such time as may be
designated from time to time by the Board of Directors.

                (b) At an annual meeting of the stockholders, only such business
shall be conducted as shall have been properly brought before the meeting. To be
properly brought before an annual meeting, business must be: (A) specified in
the notice of meeting (or any supplement thereto) given by or at the direction
of the Board of Directors, (B) otherwise properly brought before the meeting by
or at the direction of the Board of Directors, or (C) otherwise properly brought
before the meeting by a stockholder. For business to be properly brought before
an annual meeting by a stockholder, the stockholder must have given timely
notice thereof in writing to the Secretary of the corporation. To be timely, a
stockholder's notice must be delivered to or mailed and received at the
principal executive offices of the corporation not later than the close of
business on the sixtieth (60th) day nor earlier than the close of business on
the ninetieth (90th) day prior to the first anniversary of the preceding year's
annual meeting; provided, however, that in the event that no annual meeting was
held in the previous year or the date of the annual meeting has been changed by
more than thirty (30) days from the date contemplated at the time of the
previous year's proxy statement, notice by the stockholder to be timely must be
so received not earlier than the close of business on the ninetieth (90th) day
prior to such annual meeting and not later than the close of business on the
later of the sixtieth (60th) day prior to such annual meeting or, in the event
public announcement of the date of such annual meeting is first made by the
corporation fewer than seventy (70) days prior to the date of such annual
meeting, the close of business on the tenth (10th) day following the day on
which public announcement of the date of such meeting is first made by the
corporation. A stockholder's notice to the Secretary shall set forth as to each
matter the stockholder proposes to bring before the annual meeting: (i) a brief
description of the business desired to be brought before the annual meeting and
the reasons for conducting such business at the annual meeting, (ii) the name
and address, as they appear on the corporation's books, of the stockholder
proposing such business, (iii) the class and number of shares of the corporation
which are beneficially owned by the stockholder, (iv) any material interest of
the stockholder in such business and (v) any other information that is required
to be provided by the stockholder pursuant to Regulation 14A under the
Securities Exchange Act of 1934, as amended (the "1934 Act"), in his capacity as
a proponent to a stockholder proposal. Notwithstanding the foregoing, in order
to include information with respect to a stockholder proposal in the proxy
statement and form of proxy for a stockholder's meeting, stockholders must
provide notice as required by the regulations promulgated under the 1934 Act.
Notwithstanding anything in these Bylaws to the contrary, no business shall be
conducted at any annual meeting except in accordance with the procedures set
forth in this paragraph (b). The chairman of the annual meeting shall, if the
facts warrant, determine and declare at the meeting that business was not
properly brought before the meeting and in accordance with the provisions of
this paragraph (b), and, if he should so determine, he shall so declare at the
meeting that any such business not properly brought before the meeting shall not
be transacted.


                                       2.
   8

                (c) Only persons who are nominated in accordance with the
procedures set forth in this paragraph (c) shall be eligible for election as
Directors. Nominations of persons for election to the Board of Directors of the
corporation may be made at a meeting of stockholders by or at the direction of
the Board of Directors or by any stockholder of the corporation entitled to vote
in the election of Directors at the meeting who complies with the notice
procedures set forth in this paragraph (c). Such nominations, other than those
made by or at the direction of the Board of Directors, shall be made pursuant to
timely notice in writing to the Secretary of the corporation in accordance with
the provisions of paragraph (b) of this Section 5. Such stockholder's notice
shall set forth (i) as to each person, if any, whom the stockholder proposes to
nominate for election or re-election as a Director: (A) the name, age, business
address and residence address of such person, (B) the principal occupation or
employment of such person, (C) the class and number of shares of the corporation
which are beneficially owned by such person, (D) a description of all
arrangements or understandings between the stockholder and each nominee and any
other person or persons (naming such person or persons) pursuant to which the
nominations are to be made by the stockholder, and (E) any other information
relating to such person that is required to be disclosed in solicitations of
proxies for election of Directors, or is otherwise required, in each case
pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended
(including without limitation such person's written consent to being named in
the proxy statement, if any, as a nominee and to serving as a Director if
elected); and (ii) as to such stockholder giving notice, the information
required to be provided pursuant to paragraph (b) of this Section 5. At the
request of the Board of Directors, any person nominated by a stockholder for
election as a Director shall furnish to the Secretary of the corporation that
information required to be set forth in the stockholder's notice of nomination
which pertains to the nominee. No person shall be eligible for election as a
Director of the corporation unless nominated in accordance with the procedures
set forth in this paragraph (c). The chairman of the meeting shall, if the facts
warrant, determine and declare at the meeting that a nomination was not made in
accordance with the procedures prescribed by these Bylaws, and if he should so
determine, he shall so declare at the meeting and the defective nomination shall
be disregarded.

                (d) For purposes of this Section 5, "public announcement" shall
mean disclosure in a press release reported by the Dow Jones News Service,
Associated Press or comparable national news service or in a document publicly
filed by the corporation with the Securities and Exchange Commission pursuant to
Section 13, 14 or 15(d) of the Exchange Act.

         SECTION 6. SPECIAL MEETINGS.

                (a) Special meetings of the stockholders of the corporation may
be called, for any purpose or purposes, by (i) the Chairman of the Board, (ii)
the President or (iii) the Board of Directors pursuant to a resolution adopted
by a majority of the total number of authorized directors (whether or not there
exist any vacancies in previously authorized directorships at the time any such
resolution is presented to the Board for adoption).

                (b) If a special meeting is called by any person or persons
other than the Board of Directors, the request shall be in writing, specifying
the time of such meeting and the general


                                       3.
   9

nature of the business proposed to be transacted, and shall be delivered
personally or sent by registered mail or by telegraphic or other facsimile
transmission to the Chairman of the Board, the President, any Vice President, or
the Secretary of the corporation. No business may be transacted at such special
meeting otherwise than specified in such notice. The officer receiving the
request shall cause notice to be promptly given to the stockholders entitled to
vote, in accordance with the provisions of Section 7 of these Bylaws, that a
meeting will be held not less than thirty-five (35) nor more than sixty (60)
days after the receipt of the request. If the notice is not given within twenty
(20) days after the receipt of the request, the person or persons requesting the
meeting may give the notice. Nothing contained in this paragraph (b) shall be
construed as limiting, fixing, or affecting the time when a meeting of
stockholders called by action of the Board of Directors may be held.

         SECTION 7. NOTICE OF MEETINGS. Except as otherwise provided by law or
the Certificate of Incorporation, written notice of each meeting of stockholders
shall be given not less than ten (10) nor more than sixty (60) days before the
date of the meeting to each stockholder entitled to vote at such meeting, such
notice to specify the place, date and hour and purpose or purposes of the
meeting. Notice of the time, place and purpose of any meeting of stockholders
may be waived in writing, signed by the person entitled to notice thereof,
either before or after such meeting, and will be waived by any stockholder by
his attendance thereat in person or by proxy, except when the stockholder
attends a meeting for the express purpose of objecting, at the beginning of the
meeting, to the transaction of any business because the meeting is not lawfully
called or convened. Any stockholder so waiving notice of such meeting shall be
bound by the proceedings of any such meeting in all respects as if due notice
thereof had been given.

         SECTION 8. QUORUM. At all meetings of stockholders, except where
otherwise provided by statute or by the Certificate of Incorporation, or by
these Bylaws, the presence, in person or by proxy duly authorized, of the
holders of a majority of the outstanding shares of stock entitled to vote shall
constitute a quorum for the transaction of business. Any shares, the voting of
which at said meeting has been enjoined, or which for any reason cannot be
lawfully voted at such meeting, shall not be counted to determine a quorum at
such meeting. In the absence of a quorum any meeting of stockholders may be
adjourned, from time to time, either by the chairman of the meeting or by vote
of the holders of a majority of the shares represented thereat, but no other
business shall be transacted at such meeting. The stockholders present at a duly
called or convened meeting, at which a quorum is present, may continue to
transact business until adjournment, notwithstanding the withdrawal of enough
stockholders to leave less than a quorum. Except as otherwise provided by law,
the Certificate of Incorporation or these Bylaws, all action taken by the
holders of a majority of the voting power represented at any meeting at which a
quorum is present shall be valid and binding upon the corporation; provided,
however, that Directors shall be elected by a plurality of the votes of the
shares present in person or represented by proxy at the meeting and entitled to
vote on the election of Directors. Where a separate vote by a class or classes
is required, a majority of the outstanding shares of such class or classes,
present in person or represented by proxy, shall constitute a quorum entitled to
take action with respect to that vote on that matter and the affirmative vote of
the


                                       4.
   10

majority (plurality, in the case of the election of Directors) of shares of such
class or classes present in person or represented by proxy at the meeting shall
be the act of such class.


         SECTION 9. ADJOURNMENT AND NOTICE OF ADJOURNED MEETINGS. Any meeting of
stockholders, whether annual or special, may be adjourned from time to time
either by the chairman of the meeting or by the vote of a majority of the shares
represented thereat. When a meeting is adjourned to another time or place,
notice need not be given of the adjourned meeting if the time and place thereof
are announced at the meeting at which the adjournment is taken. At the adjourned
meeting the corporation may transact any business which might have been
transacted at the original meeting. If the adjournment is for more than thirty
(30) days, or if after the adjournment a new record date is fixed for the
adjourned meeting, a notice of the adjourned meeting shall be given to each
stockholder of record entitled to vote at the meeting.

         SECTION 10. VOTING RIGHTS.

                (a)  For the purpose of determining those stockholders entitled
to vote at any meeting of the stockholders, except as otherwise provided by law,
only persons in whose names shares stand on the stock records of the corporation
on the record date, as provided in Section 12 of these Bylaws, shall be entitled
to vote at any meeting of stockholders. Except as may be otherwise provided in
the Certificate of Incorporation or these Bylaws, each stockholder shall be
entitled to one vote for each share of capital stock held by such stockholder.
Every person entitled to vote or execute consents shall have the right to do so
either in person or by an agent or agents authorized by a written proxy executed
by such person or his duly authorized agent, which proxy shall be filed with the
Secretary at or before the meeting at which it is to be used. An agent so
appointed need not be a stockholder. No proxy shall be voted after three (3)
years from its date of creation unless the proxy provides for a longer period.
All elections of Directors shall be by written ballot, unless otherwise provided
in the Certificate of Incorporation.

         SECTION 11. BENEFICIAL OWNERS OF STOCK.

                (a)  If shares or other securities having voting power stand of
record in the names of two (2) or more persons, whether fiduciaries, members of
a partnership, joint tenants, tenants in common, tenants by the entirety, or
otherwise, or if two (2) or more persons have the same fiduciary relationship
respecting the same shares, unless the Secretary is given written notice to the
contrary and is furnished with a copy of the instrument or order appointing them
or creating the relationship wherein it is so provided, their acts with respect
to voting shall have the following effect: (a) if only one (1) votes, his act
binds all; (b) if more than one (1) votes, the act of the majority so voting
binds all; (c) if more than one (1) votes, but the vote is evenly split on any
particular matter, each faction may vote the securities in question
proportionally, or may apply to the Delaware Court of Chancery for relief as
provided in the General Corporation Law of Delaware, Section 217(b). If the
instrument filed with the Secretary shows that any such tenancy is held in
unequal interests, a majority or even-split for the purpose of this subsection
(c) shall be a majority or even-split in interest.


                                       5.
   11

                (b)  Persons holding stock in a fiduciary capacity shall be
entitled to vote the shares so held. Persons whose stock is pledged shall be
entitled to vote, unless in the transfer by the pledgor on the books of the
corporation he has expressly empowered the pledgee to vote thereon, in which
case only the pledgee, or his proxy, may represent such stock and vote thereon.

         SECTION 12. LIST OF STOCKHOLDERS. The Secretary shall prepare and make,
at least ten (10) days before every meeting of stockholders, a complete list of
the stockholders entitled to vote at said meeting, arranged in alphabetical
order, showing the address of each stockholder and the number of shares
registered in the name of each stockholder. Such list shall be open to the
examination of any stockholder, for any purpose germane to the meeting, during
ordinary business hours, for a period of at least ten (10) days prior to the
meeting, either at a place within the city where the meeting is to be held,
which place shall be specified in the notice of the meeting, or, if not
specified, at the place where the meeting is to be held. The list shall be
produced and kept at the time and place of meeting during the whole time
thereof, and may be inspected by any stockholder who is present.

         SECTION 13. ACTION WITHOUT MEETING.

                (a)  Any action required by statute to be taken at any annual or
special meeting of the stockholders, or any action which may be taken at any
annual or special meeting of the stockholders, may be taken without a meeting,
without prior notice and without a vote, if a consent or consents in writing,
setting forth the action so taken, are signed by the holders of outstanding
stock having not less than the minimum number of votes that would be necessary
to authorize or take such action at a meeting at which all shares entitled to
vote thereon were present and voted.

                (b)  Every written consent shall bear the date of signature of
each stockholder who signs the consent, and no written consent shall be
effective to take the corporate action referred to therein unless, within sixty
(60) days of the earliest dated consent delivered to the Corporation in the
manner herein required, written consents signed by a sufficient number of
stockholders to take action are delivered to the corporation by delivery to its
registered office in the State of Delaware, its principal place of business or
an officer or agent of the corporation having custody of the book in which
proceedings of meetings of stockholders are recorded. Delivery made to a
corporation's registered office shall be by hand or by certified or registered
mail, return receipt requested.

                (c)  Prompt notice of the taking of the corporate action without
a meeting by less than unanimous written consent shall be given to those
stockholders who have not consented in writing. If the action which is consented
to is such as would have required the filing of a certificate under any section
of the General corporation Law of Delaware if such action had been voted on by
stockholders at a meeting thereof, then the certificate filed under such section
shall state, in lieu of any statement required by such section concerning any
vote of stockholders, that written notice and written consent have been given as
provided in Section 228 of the General Corporation Law of Delaware.


                                       6.
   12

                (d)  Notwithstanding the foregoing, no such action by written
consent may be taken following the effectiveness of the registration of any
class of securities of the corporation under the Securities Exchange Act of
1934, as amended.

         SECTION 14. ORGANIZATION.

                (a)  At every meeting of stockholders, the Chairman of the Board
of Directors, or, if a Chairman has not been appointed or is absent, the
President, or, if the President is absent, the most senior Vice President
present, or in the absence of any such officer, a chairman of the meeting chosen
by a majority in interest of the stockholders entitled to vote, present in
person or by proxy, shall act as chairman. The Secretary, or, in his absence, an
Assistant Secretary directed to do so by the President, shall act as secretary
of the meeting.

                (b)  The Board of Directors of the corporation shall be entitled
to make such rules or regulations for the conduct of meetings of stockholders as
it shall deem necessary, appropriate or convenient. Subject to such rules and
regulations of the Board of Directors, if any, the chairman of the meeting shall
have the right and authority to prescribe such rules, regulations and procedures
and to do all such acts as, in the judgment of such chairman, are necessary,
appropriate or convenient for the proper conduct of the meeting, including,
without limitation, establishing an agenda or order of business for the meeting,
rules and procedures for maintaining order at the meeting and the safety of
those present, limitations on participation in such meeting to stockholders of
record of the corporation and their duly authorized and constituted proxies, and
such other persons as the chairman shall permit, restrictions on entry to the
meeting after the time fixed for the commencement thereof, limitations on the
time allotted to questions or comments by participants and regulation of the
opening and closing of the polls for balloting on matters which are to be voted
on by ballot. Unless, and to the extent determined by the Board of Directors or
the chairman of the meeting, meetings of stockholders shall not be required to
be held in accordance with rules of parliamentary procedure.

                                   ARTICLE IV

                                    DIRECTORS

         SECTION 15. NUMBER AND TERM OF OFFICE. The Board of Directors shall be
eight (8). This number may be changed by one or more resolutions duly adopted by
the Board of Directors. The number of authorized Directors may be modified from
time to time by amendment of this Section 15 in accordance with the provisions
of Section 44 hereof. Except as provided in Section 17, the Directors shall be
elected by the stockholders at their annual meeting in each year and shall hold
office until the next annual meeting and until their successors shall be duly
elected and qualified. Directors need not be stockholders unless so required by
the Certificate of Incorporation. If for any cause, the Directors shall not have
been elected at an annual meeting, they may be elected as soon thereafter as
convenient at a special meeting of the stockholders called for that purpose in
the manner provided in these Bylaws. No reduction of the authorized number of
Directors shall have the effect of removing any Director


                                       7.
   13

before the Director's term of office expires, unless such removal is made
pursuant to the provisions of Section 19 hereof.

         SECTION 16. POWERS. The powers of the corporation shall be exercised,
its business conducted and its property controlled by the Board of Directors,
except as may be otherwise provided by statute or by the Certificate of
Incorporation.

         SECTION 17. VACANCIES. Unless otherwise provided in the Certificate of
Incorporation, vacancies and newly created directorships resulting from any
increase in the authorized number of Directors may be filled by a majority of
the Directors then in office, although less than a quorum, or by a sole
remaining Director, and each Director so elected shall hold office for the
unexpired portion of the term of the Director whose place shall be vacant and
until his successor shall have been duly elected and qualified. A vacancy in the
Board of Directors shall be deemed to exist under this Section 17 in the case of
the death, removal or resignation of any Director, or if the stockholders fail
at any meeting of stockholders at which Directors are to be elected (including
any meeting referred to in Section 19 below) to elect the number of Directors
then constituting the whole Board of Directors.

         SECTION 18. RESIGNATION. Any Director may resign at any time by
delivering his written resignation to the Secretary, such resignation to specify
whether it will be effective at a particular time, upon receipt by the Secretary
or at the pleasure of the Board of Directors. If no such specification is made,
it shall be deemed effective at the pleasure of the Board of Directors. When one
or more Directors shall resign from the Board of Directors, effective at a
future date, a majority of the Directors then in office, including those who
have so resigned, shall have power to fill such vacancy or vacancies, the vote
thereon to take effect when such resignation or resignations shall become
effective, and each Director so chosen shall hold office for the unexpired
portion of the term of the Director whose place shall be vacated and until his
successor shall have been duly elected and qualified.

         SECTION 19. REMOVAL. Subject to the rights of the holders of any series
of Preferred Stock, the Board of Directors or any individual director may be
removed from office at any time (i) with cause by the affirmative vote of the
holders of a majority of the voting power of all the then-outstanding shares of
voting stock of the Corporation, entitled to vote at an election of directors
(the "Voting Stock") or (ii) without cause by the affirmative vote of the
holders of at least sixty-six and two-thirds percent (66 2/3%) of the voting
power of all the then-outstanding shares of the Voting Stock.

         SECTION 20. MEETINGS.

                (a)  ANNUAL MEETINGS. The annual meeting of the Board of
Directors shall be held immediately after the annual meeting of stockholders and
at the place where such meeting is held. No notice of an annual meeting of the
Board of Directors shall be necessary and such meeting shall be held for the
purpose of electing officers and transacting such other business as may lawfully
come before it.


                                       8.
   14

                (b)  REGULAR MEETINGS. Except as hereinafter otherwise provided,
regular meetings of the Board of Directors shall be held in the office of the
corporation required to be maintained pursuant to Section 2 hereof. Unless
otherwise restricted by the Certificate of Incorporation, regular meetings of
the Board of Directors may also be held at any place within or without the State
of Delaware which has been determined by the Board of Directors.

                (c) SPECIAL MEETINGS. Unless otherwise restricted by the
Certificate of Incorporation, special meetings of the Board of Directors may be
held at any time and place within or without the State of Delaware whenever
called by the President or a majority of the Directors.

                (d) TELEPHONE MEETINGS. Any member of the Board of Directors, or
of any committee thereof, may participate in a meeting by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear each other, and participation in a meeting
by such means shall constitute presence in person at such meeting.

                (e) NOTICE OF MEETINGS. Written notice of the time and place of
all special meetings of the Board of Directors shall be given at least one (1)
day before the date of the meeting. Notice of any meeting may be waived in
writing at any time before or after the meeting and will be waived by any
Director by attendance thereat, except when the Director attends the meeting for
the express purpose of objecting, at the beginning of the meeting, to the
transaction of any business because the meeting is not lawfully called or
convened.

                (f) WAIVER OF NOTICE. The transaction of all business at any
meeting of the Board of Directors, or any committee thereof, however called or
noticed, or wherever held, shall be as valid as though had at a meeting duly
held after regular call and notice, if a quorum be present and if, either before
or after the meeting, each of the Directors not present shall sign a written
waiver of notice, or a consent to holding such meeting, or an approval of the
minutes thereof. Neither the business to be transacted at, nor the purpose of,
any regular or special meeting of the Board of Directors need be specified in
any written waiver of notice or consent unless so required by the Certificate of
Incorporation or these Bylaws. All such waivers, consents or approvals shall be
filed with the corporate records or made a part of the minutes of the meeting.

         SECTION 21. QUORUM AND VOTING.

                (a)  Unless the Certificate of Incorporation requires a greater
number and except with respect to indemnification questions arising under
Section 42 hereof, for which a quorum shall be one-third of the exact number of
Directors fixed from time to time in accordance with Section 15 hereof, but not
less than one (1), a quorum of the Board of Directors shall consist of a
majority of the exact number of Directors fixed from time to time in accordance
with Section 15 of these Bylaws, but not less than one (1); provided, however,
at any meeting whether a quorum be present or otherwise, a majority of the
Directors present may


                                       9.
   15

adjourn from time to time until the time fixed for the next regular meeting of
the Board of Directors, without notice other than by announcement at the
meeting.

                (b)  At each meeting of the Board of Directors at which a quorum
is present all questions and business shall be determined by a vote of a
majority of the Directors present, unless a different vote be required by law,
the Certificate of Incorporation or these Bylaws.

         SECTION 22. ACTION WITHOUT MEETING. Unless otherwise restricted by the
Certificate of Incorporation or these Bylaws, any action required or permitted
to be taken at any meeting of the Board of Directors or of any committee thereof
may be taken without a meeting, if all members of the Board of Directors or
committee, as the case may be, consent thereto in writing, and such writing or
writings are filed with the minutes of proceedings of the Board of Directors or
committee.

         SECTION 23. FEES AND COMPENSATION. Directors shall be entitled to such
compensation for their services as may be approved by the Board of Directors,
including, if so approved, by resolution of the Board of Directors, a fixed sum
and expenses of attendance, if any, for attendance at each regular or special
meeting of the Board of Directors and at any meeting of a committee of the Board
of Directors. Nothing herein contained shall be construed to preclude any
Director from serving the corporation in any other capacity as an officer,
agent, employee, or otherwise and receiving compensation therefor.

         SECTION 24. COMMITTEES.

                (a)  EXECUTIVE COMMITTEE. The Board of Directors may by
resolution passed by a majority of the whole Board of Directors, appoint an
Executive Committee to consist of one (1) or more members of the Board of
Directors. The Executive Committee, to the extent permitted by law and
specifically granted by the Board of Directors, shall have and may exercise when
the Board of Directors is not in session all powers of the Board of Directors in
the management of the business and affairs of the corporation, including,
without limitation, the power and authority to declare a dividend or to
authorize the issuance of stock, except such committee shall not have the power
or authority to amend the Certificate of Incorporation, to adopt an agreement of
merger or consolidation, to recommend to the stockholders the sale, lease or
exchange of all or substantially all of the corporation's property and assets,
to recommend to the stockholders of the corporation a dissolution of the
corporation or a revocation of a dissolution or to amend these Bylaws.

                (b)  OTHER COMMITTEES. The Board of Directors may, by resolution
passed by a majority of the whole Board of Directors, from time to time appoint
such other committees as may be permitted by law. Such other committees
appointed by the Board of Directors shall consist of one (1) or more members of
the Board of Directors, and shall have such powers and perform such duties as
may be prescribed by the resolution or resolutions creating such committees, but
in no event shall such committee have the powers denied to the Executive
Committee in these Bylaws.


                                      10.
   16

                (c)  TERM. The members of all committees of the Board of
Directors shall serve a term coexistent with that of the Board of Directors
which shall have appointed such committee. The Board of Directors, subject to
the provisions of subsections (a) or (b) of this Section 24, may at any time
increase or decrease the number of members of a committee or terminate the
existence of a committee. The membership of a committee member shall terminate
on the date of his death or voluntary resignation from the committee or from the
Board of Directors. The Board of Directors may at any time for any reason remove
any individual committee member and the Board of Directors may fill any
committee vacancy created by death, resignation, removal or increase in the
number of members of the committee. The Board of Directors may designate one or
more Directors as alternate members of any committee, who may replace any absent
or disqualified member at any meeting of the committee, and, in addition, in the
absence or disqualification of any member of a committee, the member or members
thereof present at any meeting and not disqualified from voting, whether or not
he or they constitute a quorum, may unanimously appoint another member of the
Board of Directors to act at the meeting in the place of any such absent or
disqualified member.

                (d) MEETINGS. Unless the Board of Directors shall otherwise
provide, regular meetings of the Executive Committee or any other committee
appointed pursuant to this Section 24 shall be held at such times and places as
are determined by the Board of Directors, or by any such committee, and when
notice thereof has been given to each member of such committee, no further
notice of such regular meetings need be given thereafter. Special meetings of
any such committee may be held at any place which has been determined from time
to time by such committee, and may be called by any Director who is a member of
such committee, upon written notice to the members of such committee of the time
and place of such special meeting given in the manner provided for the giving of
written notice to members of the Board of Directors of the time and place of
special meetings of the Board of Directors. Notice of any special meeting of any
committee may be waived in writing at any time before or after the meeting and
will be waived by any Director by attendance thereat, except when the Director
attends such special meeting for the express purpose of objecting, at the
beginning of the meeting, to the transaction of any business because the meeting
is not lawfully called or convened. A majority of the authorized number of
members of any such committee shall constitute a quorum for the transaction of
business, and the act of a majority of those present at any meeting at which a
quorum is present shall be the act of such committee.

         SECTION 25. ORGANIZATION. At every meeting of the Directors, the
Chairman of the Board of Directors, or, if a Chairman has not been appointed or
is absent, the President, or if the President is absent, the most senior Vice
President, or, in the absence of any such officer, a chairman of the meeting
chosen by a majority of the Directors present, shall preside over the meeting.
The Secretary, or in his absence, an Assistant Secretary directed to do so by
the President, shall act as secretary of the meeting.


                                      11.
   17

                                    ARTICLE V

                                    OFFICERS

         SECTION 26. OFFICERS DESIGNATED. The officers of the corporation shall
be the Chairman of the Board of Directors, the President, one or more Vice
Presidents, the Secretary and the Chief Financial Officer or Treasurer, all of
whom shall be elected at the annual organizational meeting of the Board of
Directors. The order of the seniority of the Vice Presidents shall be in the
order of their nomination, unless otherwise determined by the Board of
Directors. The Board of Directors may also appoint one or more Assistant
Secretaries, Assistant Treasurers, and such other officers and agents with such
powers and duties as it shall deem necessary. The Board of Directors may assign
such additional titles to one or more of the officers as it shall deem
appropriate. Any one person may hold any number of offices of the corporation at
any one time unless specifically prohibited therefrom by law. The salaries and
other compensation of the officers of the corporation shall be fixed by or in
the manner designated by the Board of Directors.

         SECTION 27. TENURE AND DUTIES OF OFFICERS.

                (a)  GENERAL. All officers shall hold office at the pleasure of
the Board of Directors and until their successors shall have been duly elected
and qualified, unless sooner removed. Any officer elected or appointed by the
Board of Directors may be removed at any time by the Board of Directors. If the
office of any officer becomes vacant for any reason, the vacancy may be filled
by the Board of Directors.

                (b) DUTIES OF CHAIRMAN OF THE BOARD OF DIRECTORS. The Chairman
of the Board of Directors, when present, shall preside at all meetings of the
stockholders and the Board of Directors. The Chairman of the Board of Directors
shall perform other duties commonly incident to his office and shall also
perform such other duties and have such other powers as the Board of Directors
shall designate from time to time.

                (c) DUTIES OF PRESIDENT. The President shall preside at all
meetings of the stockholders and at all meetings of the Board of Directors,
unless the Chairman of the Board of Directors has been appointed and is present.
The President shall be the Chief Executive Officer of the corporation and shall,
subject to the control of the Board of Directors, have general supervision,
direction and control of the business and officers of the corporation. The
President shall perform other duties commonly incident to his office and shall
also perform such other duties and have such other powers as the Board of
Directors shall designate from time to time.

                (d)  DUTIES OF VICE PRESIDENTS. The Vice Presidents, in the
order of their seniority, may assume and perform the duties of the President in
the absence or disability of the President or whenever the office of President
is vacant. The Vice Presidents shall perform other duties commonly incident to
their office and shall also perform such other duties and have such other powers
as the Board of Directors or the President shall designate from time to time.


                                      12.
   18

                (e)  DUTIES OF SECRETARY. The Secretary shall attend all
meetings of the stockholders and of the Board of Directors, and shall record all
acts and proceedings thereof in the minute book of the corporation. The
Secretary shall give notice in conformity with these Bylaws of all meetings of
the stockholders, and of all meetings of the Board of Directors and any
committee thereof requiring notice. The Secretary shall perform all other duties
given him in these Bylaws and other duties commonly incident to his office and
shall also perform such other duties and have such other powers as the Board of
Directors shall designate from time to time. The President may direct any
Assistant Secretary to assume and perform the duties of the Secretary in the
absence or disability of the Secretary, and each Assistant Secretary shall
perform other duties commonly incident to his office and shall also perform such
other duties and have such other powers as the Board of Directors or the
President shall designate from time to time.

                (f)  DUTIES OF CHIEF FINANCIAL OFFICER OR TREASURER. The Chief
Financial Officer or Treasurer shall keep or cause to be kept the books of
account of the corporation in a thorough and proper manner, and shall render
statements of the financial affairs of the corporation in such form and as often
as required by the Board of Directors or the President. The Chief Financial
Officer or Treasurer, subject to the order of the Board of Directors, shall have
the custody of all funds and securities of the corporation. The Chief Financial
Officer or Treasurer shall perform other duties commonly incident to his office
and shall also perform such other duties and have such other powers as the Board
of Directors or the President shall designate from time to time. The President
may direct any Assistant Treasurer to assume and perform the duties of the Chief
Financial Officer or Treasurer in the absence or disability of the Chief
Financial Officer or Treasurer, and each Assistant Treasurer shall perform other
duties commonly incident to his office and shall also perform such other duties
and have such other powers as the Board of Directors or the President shall
designate from time to time.

         SECTION 28. DELEGATION OF AUTHORITY. The Board of Directors may from
time to time delegate the powers or duties of any officer to any other officer
or agent, notwithstanding any provision hereof.

         SECTION 29. RESIGNATIONS. Any officer may resign at any time by giving
written notice to the Board of Directors or to the President or to the
Secretary. Any such resignation shall be effective when received by the person
or persons to whom such notice is given, unless a later time is specified
therein, in which event the resignation shall become effective at such later
time. Unless otherwise specified in such notice, the acceptance of any such
resignation shall not be necessary to make it effective. Any resignation shall
be without prejudice to the rights, if any, of the corporation under any
contract with the resigning officer.

         SECTION 30. REMOVAL. Any officer may be removed from office at any
time, either with or without cause, by the vote or written consent of a majority
of the Directors in office at the time, or by any committee or superior officers
upon whom such power of removal may have been conferred by the Board of
Directors.


                                      13.
   19

                                   ARTICLE VI

                     EXECUTION OF CORPORATE INSTRUMENTS AND
                  VOTING OF SECURITIES OWNED BY THE CORPORATION

         SECTION 31. EXECUTION OF CORPORATE INSTRUMENTS. The Board of Directors
may, in its discretion, determine the method and designate the signatory officer
or officers, or other person or persons, to execute on behalf of the corporation
any corporate instrument or document, or to sign on behalf of the corporation
the corporate name without limitation, or to enter into contracts on behalf of
the corporation, except where otherwise provided by law or these Bylaws, and
such execution or signature shall be binding upon the corporation.

         Unless otherwise specifically determined by the Board of Directors or
otherwise required by law, promissory notes, deeds of trust, mortgages and other
evidences of indebtedness of the corporation, and other corporate instruments or
documents requiring the corporate seal, and certificates of shares of stock
owned by the corporation, shall be executed, signed or endorsed by the Chairman
of the Board of Directors, or the President or any Vice President, and by the
Secretary or Chief Financial Officer or Treasurer or any Assistant Secretary or
Assistant Treasurer. All other instruments and documents requiring the corporate
signature, but not requiring the corporate seal, may be executed as aforesaid or
in such other manner as may be directed by the Board of Directors.

         All checks and drafts drawn on banks or other depositaries on funds to
the credit of the corporation or in special accounts of the corporation shall be
signed by such person or persons as the Board of Directors shall authorize so to
do.

         Unless authorized or ratified by the Board of Directors or within the
agency power of an officer, no officer, agent or employee shall have any power
or authority to bind the corporation by any contract or engagement or to pledge
its credit or to render it liable for any purpose or for any amount.

         SECTION 32. VOTING OF SECURITIES OWNED BY THE CORPORATION. All stock
and other securities of other corporations owned or held by the corporation for
itself, or for other parties in any capacity, shall be voted, and all proxies
with respect thereto shall be executed, by the person authorized so to do by
resolution of the Board of Directors, or, in the absence of such authorization,
by the Chairman of the Board of Directors, the President, or any Vice President.


                                      14.
   20

                                   ARTICLE VII

                                 SHARES OF STOCK

         SECTION 33. FORM AND EXECUTION OF CERTIFICATES. Certificates for the
shares of stock of the corporation shall be in such form as is consistent with
the Certificate of Incorporation and applicable law. Every holder of stock in
the corporation shall be entitled to have a certificate signed by or in the name
of the corporation by the Chairman of the Board of Directors, or the President
or any Vice President and by the Treasurer or Assistant Treasurer or the
Secretary or Assistant Secretary, certifying the number of shares owned by him
in the corporation. Where such certificate is countersigned by a transfer agent
other than the corporation or its employee, or by a registrar other than the
corporation or its employee, any other signature on the certificate may be a
facsimile. In case any officer, transfer agent, or registrar who has signed or
whose facsimile signature has been placed upon a certificate shall have ceased
to be such officer, transfer agent, or registrar before such certificate is
issued, it may be issued with the same effect as if he were such officer,
transfer agent, or registrar at the date of issue. Each certificate shall state
upon the face or back thereof, in full or in summary, all of the designations,
preferences, limitations, restrictions on transfer and relative rights of the
shares authorized to be issued.

         SECTION 34. LOST CERTIFICATES. A new certificate or certificates shall
be issued in place of any certificate or certificates theretofore issued by the
corporation alleged to have been lost, stolen, or destroyed, upon the making of
an affidavit of that fact by the person claiming the certificate of stock to be
lost, stolen, or destroyed. The corporation may require, as a condition
precedent to the issuance of a new certificate or certificates, the owner of
such lost, stolen, or destroyed certificate or certificates, or his legal
representative, to advertise the same in such manner as it shall require or to
give the corporation a surety bond in such form and amount as it may direct as
indemnity against any claim that may be made against the corporation with
respect to the certificate alleged to have been lost, stolen, or destroyed.

         SECTION 35. TRANSFERS.

                (a)  Transfers of record of shares of stock of the corporation
shall be made only upon its books by the holders thereof, in person or by
attorney duly authorized, and upon the surrender of a properly endorsed
certificate or certificates for a like number of shares.

                (b)  The corporation shall have power to enter into and perform
any agreement with any number of stockholders of any one or more classes of
stock of the corporation to restrict the transfer of shares of stock of the
corporation of any one or more classes owned by such stockholders in any manner
not prohibited by the General Corporation Law of Delaware.


                                      15.
   21

         SECTION 36. FIXING RECORD DATES.

                (a)  In order that the Corporation may determine the
stockholders entitled to notice of or to vote at any meeting of stockholders or
any adjournment thereof, the Board of Directors may fix, in advance, a record
date, which record date shall not precede the date upon which the resolution
fixing the record date is adopted by the Board of Directors, and which record
date shall not be more than sixty (60) nor less than ten (10) days before the
date of such meeting. If no record date is fixed by the Board of Directors, the
record date for determining stockholders entitled to notice of or to vote at a
meeting of stockholders shall be at the close of business on the day next
preceding the day on which notice is given, or if notice is waived, at the close
of business on the day next preceding the day on which the meeting is held. A
determination of stockholders of record entitled to notice of or to vote at a
meeting of stockholders shall apply to any adjournment of the meeting; provided,
however, that the Board of Directors may fix a new record date for the adjourned
meeting.

                (b)  In order that the Corporation may determine the
stockholders entitled to consent to corporate action in writing without a
meeting, the Board of Directors may fix, in advance, a record date, which record
date shall not precede the date upon which the resolution fixing the record date
is adopted by the Board of Directors, and which date shall not be more than ten
(10) days after the date upon which the resolution fixing the record date is
adopted by the Board of Directors. If no record date has been fixed by the Board
of Directors, the record date for determining stockholders entitled to consent
to corporate action in writing without a meeting, when no prior action by the
Board of Directors is required by law, shall be the first date on which a signed
written consent setting forth the action taken or proposed to be taken is
delivered to the Corporation by delivery to its registered office in the State
of Delaware, its principal place of business or an officer or agent of the
Corporation having custody of the book in which proceedings of meetings of
stockholders are recorded. Delivery made to a Corporation's registered office
shall be by hand or by certified or registered mail, return receipt requested.
If no record date has been fixed by the Board of Directors and prior action by
the Board of Directors is required by law, the record date for determining
stockholders entitled to consent to corporate action in writing without a
meeting shall be at the close of business on the day on which the Board of
Directors adopts the resolution taking such prior action.

                (c)  In order that the corporation may determine the
stockholders entitled to receive payment of any dividend or other distribution
or allotment of any rights or the stockholders entitled to exercise any rights
in respect of any change, conversion or exchange of stock, or for the purpose of
any other lawful action, the Board of Directors may fix, in advance, a record
date, which record date shall not precede the date upon which the resolution
fixing the record date is adopted, and which record date shall be not more than
sixty (60) days prior to such action. If no record date is fixed, the record
date for determining stockholders for any such purpose shall be at the close of
business on the day on which the Board of Directors adopts the resolution
relating thereto.

         SECTION 37. REGISTERED STOCKHOLDERS. The corporation shall be entitled
to recognize the exclusive right of a person registered on its books as the
owner of shares to receive


                                      16.
   22

dividends, and to vote as such owner, and shall not be bound to recognize any
equitable or other claim to or interest in such share or shares on the part of
any other person whether or not it shall have express or other notice thereof,
except as otherwise provided by the laws of Delaware.


                                  ARTICLE VIII

                       OTHER SECURITIES OF THE CORPORATION

         SECTION 38. EXECUTION OF OTHER SECURITIES. All bonds, debentures and
other corporate securities of the corporation, other than stock certificates
(covered in Section 33), may be signed by the Chairman of the Board of
Directors, the President or any Vice President, or such other person as may be
authorized by the Board of Directors, and the corporate seal impressed thereon
or a facsimile of such seal imprinted thereon and attested by the signature of
the Secretary or an Assistant Secretary, or the Chief Financial Officer or
Treasurer or an Assistant Treasurer; provided, however, that where any such
bond, debenture or other corporate security shall be authenticated by the manual
signature of a trustee under an indenture pursuant to which such bond, debenture
or other corporate security shall be issued, the signatures of the persons
signing and attesting the corporate seal on such bond, debenture or other
corporate security may be the imprinted facsimile of the signatures of such
persons. Interest coupons appertaining to any such bond, debenture or other
corporate security, authenticated by a trustee as aforesaid, shall be signed by
the Treasurer or an Assistant Treasurer of the corporation or such other person
as may be authorized by the Board of Directors, or bear imprinted thereon the
facsimile signature of such person. In case any officer who shall have signed or
attested any bond, debenture or other corporate security, or whose facsimile
signature shall appear thereon or on any such interest coupon, shall have ceased
to be such officer before the bond, debenture or other corporate security so
signed or attested shall have been delivered, such bond, debenture or other
corporate security nevertheless may be adopted by the corporation and issued and
delivered as though the person who signed the same or whose facsimile signature
shall have been used thereon had not ceased to be such officer of the
corporation.


                                   ARTICLE IX

                                    DIVIDENDS

         SECTION 39. DECLARATION OF DIVIDENDS. Dividends upon the capital stock
of the corporation, subject to the provisions of the Certificate of
Incorporation, if any, may be declared by the Board of Directors pursuant to law
at any regular or special meeting. Dividends may be paid in cash, in property,
or in shares of the capital stock, subject to the provisions of the Certificate
of Incorporation.

         SECTION 40. DIVIDEND RESERVE. Before payment of any dividend, there may
be set aside out of any funds of the corporation available for dividends such
sum or sums as the Board of Directors from time to time, in their absolute
discretion, think proper as a reserve or reserves


                                      17.
   23

to meet contingencies, or for equalizing dividends, or for repairing or
maintaining any property of the corporation, or for such other purpose as the
Board of Directors shall think conducive to the interests of the corporation,
and the Board of Directors may modify or abolish any such reserve in the manner
in which it was created.


                                    ARTICLE X

                                   FISCAL YEAR

         SECTION 41. FISCAL YEAR. The fiscal year of the corporation shall be
fixed by resolution of the Board of Directors.


                                   ARTICLE XI

                                 INDEMNIFICATION

         SECTION 42. INDEMNIFICATION OF DIRECTORS, OFFICERS, EMPLOYEES AND OTHER
AGENTS.

                (a)  DIRECTORS. The corporation shall indemnify its Directors to
the fullest extent not prohibited by the Delaware General Corporation Law;
provided, however, that the corporation shall not be required to indemnify any
Director in connection with any proceeding (or part thereof) initiated by such
person or any proceeding by such person against the corporation or its
Directors, officers, employees or other agents unless (i) such indemnification
is expressly required to be made by law, (ii) the proceeding was authorized by
the Board of Directors of the corporation or (iii) such indemnification is
provided by the corporation, in its sole discretion, pursuant to the powers
vested in the corporation under the Delaware General Corporation Law.

                (b)  OFFICERS, EMPLOYEES AND OTHER AGENTS. The corporation shall
have power to indemnify its officers, employees and other agents as set forth in
the Delaware General Corporation Law.

                (c) GOOD FAITH.

                    (1) For purposes of any determination under this Bylaw, a
Director or executive officer shall be deemed to have acted in good faith and in
a manner he reasonably believed to be in or not opposed to the best interests of
the corporation, and, with respect to any criminal action or proceeding, to have
had no reasonable cause to believe that his conduct was unlawful, if his action
is based on information, opinions, reports and statements, including financial
statements and other financial data, in each case prepared or presented by:


                                      18.
   24

                           (i) one or more officers or employees of the
corporation whom the Director or executive officer believed to be reliable and
competent in the matters presented;

                           (ii) counsel, independent accountants or other
persons as to matters which the Director or executive officer believed to be
within such person's professional competence; and

                           (iii) with respect to a Director, a committee of the
Board upon which such Director does not serve, as to matters within such
Committee's designated authority, which committee the Director believes to merit
confidence; so long as, in each case, the Director or executive officer acts
without knowledge that would cause such reliance to be unwarranted.

                    (2) The termination of any proceeding by judgment, order,
settlement, conviction or upon a plea of nolo contendere or its equivalent shall
not, of itself, create a presumption that the person did not act in good faith
and in a manner which he reasonably believed to be in or not opposed to the best
interests of the corporation, and, with respect to any criminal proceeding, that
he had reasonable cause to believe that his conduct was unlawful.

                    (3) The provisions of this paragraph (c) shall not be deemed
to be exclusive or to limit in any way the circumstances in which a person may
be deemed to have met the applicable standard of conduct set forth by the
Delaware General Corporation Law.

                (d)  EXPENSES. The corporation shall advance, prior to the final
disposition of any proceeding, promptly following request therefor, all expenses
incurred by any Director or executive officer in connection with such proceeding
upon receipt of an undertaking by or on behalf of such person to repay said
amounts if it should be determined ultimately that such person is not entitled
to be indemnified under this Bylaw or otherwise.

                (e) ENFORCEMENT. Without the necessity of entering into an
express contract, all rights to indemnification and advances to Directors and
executive officers under this Bylaw shall be deemed to be contractual rights and
be effective to the same extent and as if provided for in a contract between the
corporation and the Director or executive officer. Any right to indemnification
or advances granted by this Bylaw to a Director or executive officer shall be
enforceable by or on behalf of the person holding such right in any court of
competent jurisdiction if (i) the claim for indemnification or advances is
denied, in whole or in part, or (ii) no disposition of such claim is made within
ninety (90) days of request therefor. The claimant in such enforcement action,
if successful in whole or in part, shall be entitled to be paid also the expense
of prosecuting his claim. The corporation shall be entitled to raise as a
defense to any such action that the claimant has not met the standards of
conduct that make it permissible under the Delaware General Corporation Law for
the corporation to indemnify the claimant for the amount claimed. Neither the
failure of the corporation (including its Board of Directors, independent legal
counsel or its stockholders) to have made a determination prior to the
commencement of such action that indemnification of the claimant is proper in
the circumstances


                                      19.
   25

because he has met the applicable standard of conduct set forth in the Delaware
General Corporation Law, nor an actual determination by the corporation
(including its Board of Directors, independent legal counsel or its
stockholders) that the claimant has not met such applicable standard of conduct,
shall be a defense to the action or create a presumption that claimant has not
met the applicable standard of conduct.

                (f)  NON-EXCLUSIVITY OF RIGHTS. The rights conferred on any
person by this Bylaw shall not be exclusive of any other right which such person
may have or hereafter acquire under any statute, provision of the Certificate of
Incorporation, Bylaws, agreement, vote of stockholders or disinterested
Directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office. The corporation is specifically
authorized to enter into individual contracts with any or all of its Directors,
officers, employees or agents respecting indemnification and advances, to the
fullest extent not prohibited by the Delaware General Corporation Law.

                (g) SURVIVAL OF RIGHTS. The rights conferred on any person by
this Bylaw shall continue as to a person who has ceased to be a Director,
officer, employee or other agent and shall inure to the benefit of the heirs,
executors and administrators of such a person.

                (h) INSURANCE. To the fullest extent permitted by the Delaware
General Corporation Law, the corporation, upon approval by the Board of
Directors, may purchase insurance on behalf of any person required or permitted
to be indemnified pursuant to this Bylaw.

                (i) AMENDMENTS. Any repeal or modification of this Bylaw shall
only be prospective and shall not affect the rights under this Bylaw in effect
at the time of the alleged occurrence of any action or omission to act that is
the cause of any proceeding against any agent of the corporation.

                (j) SAVING CLAUSE. If this Bylaw or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
corporation shall nevertheless indemnify each Director and executive officer to
the full extent not prohibited by any applicable portion of this Bylaw that
shall not have been invalidated, or by any other applicable law.

                (k) CERTAIN DEFINITIONS. For the purposes of this Bylaw, the
following definitions shall apply:

                    (1) The term "proceeding" shall be broadly construed and
shall include, without limitation, the investigation, preparation, prosecution,
defense, settlement, arbitration and appeal of, and the giving of testimony in,
any threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative.


                                      20.
   26

                    (2) The term "expenses" shall be broadly construed and shall
include, without limitation, court costs, attorneys' fees, witness fees, fines,
amounts paid in settlement or judgment and any other costs and expenses of any
nature or kind incurred in connection with any proceeding.

                    (3) The term the "corporation" shall include, in addition to
the resulting corporation, any constituent corporation (including any
constituent of a constituent) absorbed in a consolidation or merger which, if
its separate existence had continued, would have had power and authority to
indemnify its directors, officers, and employees or agents, so that any person
who is or was a director, officer, employee or agent of such constituent
corporation, or is or was serving at the request of such constituent corporation
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise, shall stand in the same position under
the provisions of this Bylaw with respect to the resulting or surviving
corporation as he would have with respect to such constituent corporation if its
separate existence had continued.

                    (4) References to a "director," "officer," "employee," or
"agent" of the corporation shall include, without limitation, situations where
such person is serving at the request of the corporation as a director, officer,
employee, trustee or agent of another corporation, partnership, joint venture,
trust or other enterprise.

                    (5) References to "other enterprises" shall include employee
benefit plans; references to "fines" shall include any excise taxes assessed on
a person with respect to an employee benefit plan; and references to "serving at
the request of the corporation" shall include any service as a director,
officer, employee or agent of the corporation which imposes duties on, or
involves services by, such director, officer, employee, or agent with respect to
an employee benefit plan, its participants, or beneficiaries; and a person who
acted in good faith and in a manner he reasonably believed to be in the interest
of the participants and beneficiaries of an employee benefit plan shall be
deemed to have acted in a manner "not opposed to the best interests of the
corporation" as referred to in this Bylaw.


                                   ARTICLE XII

                                     NOTICES

         SECTION 43. NOTICES.

                (a)  NOTICE TO STOCKHOLDERS. Whenever, under any provisions of
these Bylaws, notice is required to be given to any stockholder, it shall be
given in writing, timely and duly deposited in the United States mail, postage
prepaid, and addressed to his last known post office address as shown by the
stock record of the corporation or its transfer agent.


                                      21.
   27

                (b)  NOTICE TO DIRECTORS. Any notice required to be given to any
Director may be given by the method stated in subsection (a), or by facsimile,
telex or telegram, except that such notice other than one which is delivered
personally shall be sent to such address as such Director shall have filed in
writing with the Secretary, or, in the absence of such filing, to the last known
post office address of such Director.

                (c) ADDRESS UNKNOWN. If no address of a stockholder or Director
be known, notice may be sent to the office of the corporation required to be
maintained pursuant to Section 2 hereof.

                (d) AFFIDAVIT OF MAILING. An affidavit of mailing, executed by a
duly authorized and competent employee of the corporation or its transfer agent
appointed with respect to the class of stock affected, specifying the name and
address or the names and addresses of the stockholder or stockholders, or
Director or Directors, to whom any such notice or notices was or were given, and
the time and method of giving the same, shall be conclusive evidence of the
statements therein contained.

                (e) TIME NOTICES DEEMED GIVEN. All notices given by mail, as
above provided, shall be deemed to have been given as at the time of mailing and
all notices given by facsimile, telex or telegram shall be deemed to have been
given as of the sending time recorded at time of transmission.

                (f) METHODS OF NOTICE. It shall not be necessary that the same
method of giving notice be employed in respect of all Directors, but one
permissible method may be employed in respect of any one or more, and any other
permissible method or methods may be employed in respect of any other or others.

                (g) FAILURE TO RECEIVE NOTICE. The period or limitation of time
within which any stockholder may exercise any option or right, or enjoy any
privilege or benefit, or be required to act, or within which any Director may
exercise any power or right, or enjoy any privilege, pursuant to any notice sent
him in the manner above provided, shall not be affected or extended in any
manner by the failure of such stockholder or such Director to receive such
notice.

                (h) NOTICE TO PERSON WITH WHOM COMMUNICATION IS UNLAWFUL.
Whenever notice is required to be given, under any provision of law or of the
Certificate of Incorporation or Bylaws of the corporation, to any person with
whom communication is unlawful, the giving of such notice to such person shall
not be required and there shall be no duty to apply to any governmental
authority or agency for a license or permit to give such notice to such person.
Any action or meeting which shall be taken or held without notice to any such
person with whom communication is unlawful shall have the same force and effect
as if such notice had been duly given. In the event that the action taken by the
corporation is such as to require the filing of a certificate under any
provision of the Delaware General Corporation Law, the certificate shall state,
if such is the fact and if notice is required, that notice was given to all
persons entitled to receive notice except such persons with whom communication
is unlawful.


                                      22.
   28

                (i)  NOTICE TO PERSON WITH UNDELIVERABLE ADDRESS. Whenever
notice is required to be given, under any provision of law or the Certificate of
Incorporation or Bylaws of the corporation, to any stockholder to whom (i)
notice of two consecutive annual meetings, and all notices of meetings or of the
taking of action by written consent without a meeting to such person during the
period between such two consecutive annual meetings, or (ii) all, and at least
two, payments (if sent by first class mail) of dividends or interest on
securities during a twelve month period, have been mailed addressed to such
person at his address as shown on the records of the Corporation and have been
returned undeliverable, the giving of such notice to such person shall not be
required. Any action or meeting which shall be taken or held without notice to
such person shall have the same force and effect as if such notice had been duly
given. If any such person shall deliver to the corporation a written notice
setting forth his then current address, the requirement that notice be given to
such person shall be reinstated. In the event that the action taken by the
corporation is such as to require the filing of a certificate under any
provision of the Delaware General Corporation Law, the certificate need not
state that notice was not given to persons to whom notice was not required to be
given pursuant to this paragraph.


                                  ARTICLE XIII

                                   AMENDMENTS

         SECTION 44. AMENDMENTS. Except as otherwise set forth in paragraph (i)
of Section 42 of these Bylaws, these Bylaws may be amended or repealed and new
Bylaws adopted by the affirmative vote of at least sixty-six and two-thirds
percent (66-2/3%) of the voting power of all of the then-outstanding shares of
the Voting Stock. The Board of Directors shall also have the power, if such
power is conferred upon the Board of Directors by the Certificate of
Incorporation, to adopt, amend or repeal Bylaws (including, without limitation,
the amendment of any Bylaw setting forth the number of Directors who shall
constitute the whole Board of Directors).

                                   ARTICLE XV

                                LOANS TO OFFICERS

         SECTION 45. LOANS TO OFFICERS. The corporation may lend money to, or
guarantee any obligation of, or otherwise assist any officer or other employee
of the corporation or of its subsidiaries, including any officer or employee who
is a Director of the corporation or its subsidiaries, whenever, in the judgment
of the Board of Directors, such loan, guarantee or assistance may reasonably be
expected to benefit the corporation. The loan, guarantee or other assistance may
be with or without interest and may be unsecured, or secured in such manner as
the Board of Directors shall approve, including, without limitation, a pledge of
shares of stock of the corporation. Nothing in this Section 45 shall be deemed
to deny, limit or restrict the powers of guaranty or warranty of the corporation
at common law or under any statute.


                                      23.
   29

                                   ARTICLE XVI

                                  MISCELLANEOUS

         SECTION 46. ANNUAL REPORT.

                (a)  Subject to the provisions of Section 46(b) below, the Board
of Directors shall cause an annual report to be sent to each stockholder of the
corporation not later than one hundred twenty (120) days after the close of the
corporation's fiscal year. Such report shall include a balance sheet as of the
end of such fiscal year and an income statement and statement of changes in
financial position for such fiscal year, accompanied by any report thereon of
independent accounts or, if there is no such report, the certificate of an
authorized officer of the corporation that such statements were prepared without
audit from the books and records of the corporation. When there are more than
100 stockholders of record of the corporation's shares, as determined by Section
605 of the California Corporations Code, additional information as required by
Section 1501(b) of the California Corporations Code shall also be contained in
such report, provided that if the corporation has a class of securities
registered under Section 12 of the United States Securities Exchange Act of
1934, that Act shall take precedence. Such report shall be sent to stockholders
at least fifteen (15) days prior to the next annual meeting of stockholders
after the end of the fiscal year to which it relates.

                (b)  If and so long as there are fewer than 100 holders of
record of the corporation's shares, the requirement of sending of an annual
report to the stockholders of the corporation is hereby expressly waived.


                                      24.
   30


                       CERTIFICATE OF ASSISTANT SECRETARY




                  I hereby certify that:

                  I am the duly elected and acting Assistant Secretary of
COULTER PHARMACEUTICAL, INC., a Delaware corporation (the "Company"); and

                  Attached hereto is a complete and accurate copy of the Bylaws
of the Company as duly adopted by the Board of Directors by Unanimous Written
Consent dated as of February 24, 1995 and said Bylaws are presently in effect.

                  IN WITNESS WHEREOF, I have hereunto subscribed my name and
affixed the seal of the Company as of February 24, 1995.


                                             /s/ John A. Dado
                                             -----------------------------------
                                             John A. Dado, Assistant Secretary