Document:

EXHIBIT 4.19

                          DATED 13TH DAY OF MARCH 2001

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

                           THE GLOBAL SOURCES EMPLOYEE
                         EQUITY COMPENSATION PLAN NO. V
                           (ONE TIME SHARE GRANT PLAN)
                    -----------------------------------------

                            Appleby Spurling & Kempe
                                   Cedar House
                                 41 Cedar Avenue
                                 Hamilton HM 12

<PAGE>

                                    CONTENTS
                                                                            Page

1.       Name of the Plan....................................................1

2.       Purpose of the Plan.................................................1

3.       Shares Subject to the Plan..........................................1

4.       Eligible Persons....................................................1

5.       Non-transferability.................................................2

6.       Adjustments.........................................................2

7.       Vesting of Shares...................................................2

8.       Plan Duration.......................................................3

9.       Administration......................................................3

10.      Terminating Transactions............................................4

11.      Government Regulations..............................................4

12.       Costs and Expenses.................................................4

13.      Amendment or Termination of the Plan................................5

14.      Effective Date of this Plan.........................................5

15.      Limitation of Liability.............................................5

16.      Governing Law and Jurisdiction......................................5

Schedule 1...................................................................6

Schedule 2...................................................................7

                                      -i-
<PAGE>

                           THE GLOBAL SOURCES EMPLOYEE

                         EQUITY COMPENSATION PLAN NO. V

1.   Name of the Plan

     This Employee Equity Compensation Plan shall be known as The Global Sources
     Employee Equity Compensation Plan No. V, otherwise the One Time Share Grant
     Plan.

2.   Purpose of the Plan

     The purpose of the Global Sources Employee Equity Compensation Plan No. V
     (the "Plan") is to make awards of common shares of US$0.01 each (the
     "Shares") in Global Sources Ltd., a company incorporated in Bermuda,
     through the Global Sources Employee Equity Compensation Trust (the "Trust")
     to eligible persons as set out in Section 4.

3.   Shares Subject to the Plan

     The Shares held by Harrington Trust Limited as trustee of the Trust dated
     30 December 1999 (the "Trustee") shall be eligible for issuance by the
     Trustee pursuant to the Plan. A plan committee (the "Plan Committee") is
     constituted under the Trust and appointed by Trade Media Holdings Ltd. (the
     "Company") to determine the allocation of shares and other benefits to the
     Grantees.

4.   Eligible Persons

     The persons eligible to receive an award of Shares under the Plan (a
     "Grantee" and collectively the "Grantees") are any persons employed by the
     Company, including Directors of the Company, or by its parent (if any), or
     any of its subsidiaries or its affiliates on a salaried basis or any
     consultant or advisor to, or independent contractor of, the Company, its
     parent (if any), or any of its subsidiaries or affiliates ("eligibly
     employed") on or after the date hereof. Grantees shall be determined by
     resolution of the Board of Directors of the Company, whose decision shall
     be final. The number of Shares to be awarded to a Grantee shall be
     determined by the Plan Committee at the time of the award.

<PAGE>
                                      -2-

5.   Non-transferability

     Any Shares awarded under the Plan shall be non-transferable except in
     accordance with Section 7 hereof and with the terms of Schedules 1 and 2
     respectively.

6.   Adjustments

     If the outstanding Shares then subject to the Plan are changed into or
     exchanged for a different number or kind of shares or securities, as a
     result of one or more reorganisations, recapitalisations, stock splits,
     reverse stock splits, stock dividends and the like, appropriate adjustments
     shall be made in the number and/or type of shares or securities as shall be
     directed by the Plan Committee. Any such adjustment in outstanding Shares
     will be made in order to preserve, but not to increase or decrease, the
     benefits to the Grantees existing immediately prior to the event giving
     rise to such adjustment.

7.   Vesting of Shares

     Each Share awarded under the Plan shall vest in the Grantee as set out in
     Schedule 2, subject to the following:

     (a)  In the case of every Share awarded hereunder:

          (i)  if a Grantee ceases to be eligibly employed because of the
               Grantee's discharge for "cause", as hereinafter defined, any
               Share which has not vested is forfeited with such cessation of
               employment;

          (ii) if a Grantee ceases to be eligibly employed before all the Shares
               are vested in accordance with Schedule 2 because of the Grantee's
               resignation, which shall include retirement other than as well as
               at "normal retirement", as hereinafter defined, the Grantee shall
               receive the pro-rated portion of the Shares (if any) as would be
               vested in accordance with Schedule 2 and as are available (if at
               all) at the next vesting date following the resignation of the
               Grantee, subject always to the discretion of the Plan Committee
               to direct otherwise, whose decision shall be final;

          (iii) if a Grantee shall die before all the Shares are vested in
               accordance with Schedule 2 the person or persons to whom the
               Grantee's rights to the Shares shall have lawfully passed whether
               by will, by the applicable laws of succession or otherwise shall
               receive the pro-rated portion of the Shares (if any) as would be
               vested in accordance with Schedule 2 and as are available (if at
               all) at the next vesting date;

<PAGE>
                                      -3-

          (iv) if a Grantee shall become disabled while eligibly employed but
               before all the Shares are vested the Grantee's rights to the
               Shares which have not vested are subject to the discretion of the
               Plan Committee whose decision shall be final;

          (v)  "cause", shall mean conduct, as determined by the Board,
               involving one or more of the following: the commission of an act
               of theft, embezzlement, fraud, dishonesty, or moral turpitude,
               the deliberate disregard of the rules of the Company which
               resulted in or on the Board's determination may result in loss,
               damage or injury to the Company, the unauthorised disclosure of
               any trade secret or confidential information of the Company, the
               commission of an act which constitutes unfair competition with
               the Company, the failure to perform a duty as assigned or within
               the time period assigned or the negligent performance of duties.
               In the event that the Grantee does not accept the determination
               of the Company, the matter will be decided in accordance with
               Bermuda law and the vesting of the Shares will be suspended
               pending resolution by the Bermuda Courts;

          (vi) "normal retirement" shall mean retirement from active employment
               by the person eligibly employed on or after the normal retirement
               date specified in the applicable pension plan relating to the
               person eligibly employed or if there is no such pension plan, age
               65.

     (b)  Until Shares are vested the Grantee shall not receive dividends
          thereon or have any voting rights.

8.   Plan Duration

     No Shares may be awarded after the one time award under the Plan.

9.   Administration

     The Plan shall be managed and administered by the Trustee subject to the
     directions of the Plan Committee as provided under the Trust.

     The interpretation and construction by the Trustee of any provisions of the
     Plan shall be final and binding upon Grantees and their respective
     successors, unless otherwise determined by the Company, in which case such
     determination of the Company shall be final and binding. Neither the
     Trustee nor the Company shall be liable for any action taken, or
     determination made, in good faith.

<PAGE>
                                      -4-

     The Trustee or the Company may, from time to time, adopt rules and
     regulations for carrying out the Plan and, subject to the provisions of the
     Plan, may issue a certificate in the form annexed to the Plan or prescribe
     the form or forms of the instruments evidencing Shares awarded under the
     Plan.

     Subject to the provisions of the Plan and to the directions of the Plan
     Committee, the Trustee shall have full and final authority in its
     discretion to select the persons to be awarded Shares, to determine the
     number of Shares to be awarded, the terms of award, including any vesting
     provisions, and such other terms and provisions thereof as it may authorise
     at the time when each Share is awarded, each of which terms and provisions
     may be different for each award. The Trustee, with the consent of the Plan
     Committee, may amend the terms of any existing award to accelerate the time
     or times at which Shares awarded under the Plan, or any part thereof, shall
     become vested, or in any other respect which shall not adversely affect the
     rights of the holder of such award of Shares.

     The Company may delegate any of its powers, rights, duties and
     responsibilities under the Plan to the Plan Committee who may discharge
     same with the authority and in the place and stead of the Company.

10.  Terminating Transactions

     Upon the occurrence of a "Terminating Transaction", as hereinafter defined,
     the Plan shall terminate. Upon the happening of a Terminating Transaction,
     the Shares which have not vested shall ipso facto become vested and the
     Trustee shall, on the twentieth business day after the Terminating
     Transaction shall first have come to the notice of the Company, or on such
     earlier date as the Trustee may in its discretion determine, make payment
     in consideration therefor of an amount equal to the market value of such
     Shares on the date of such Terminating Transaction (such amount not to be
     less than zero), such payment to be made by bank draft.

     "Terminating Transaction" shall mean such transaction resulting in the
     termination or substantial termination of the Company or the takeover or
     change of control of the Company as the Plan Committee shall in its
     absolute discretion determine.

11.  Government Regulations

     The Trustee shall not issue any Shares unless and until all licences,
     permissions and authorisations required to be granted by the Government of
     Bermuda, or by any authority or agency thereof, shall have been duly
     received.

12.  Costs and Expenses

<PAGE>
                                      -5-

     All costs and expenses with respect to the adoption of the Plan and in
     connection with the registration of Shares shall be borne by the Company;
     provided, however, that except as otherwise specifically provided in the
     Plan or in any agreement between the Company and a Grantee, the Company
     shall not be obliged to pay any costs or expenses (including legal fees)
     incurred by any Grantee in connection with any Shares held or transferred
     by any Grantee.

13.  Amendment or Termination of the Plan

     The Company by resolution of the Board of Directors may alter, amend,
     suspend or terminate the Plan; however, except as otherwise provided in the
     Plan, no such action shall deprive the Grantee, without his or her consent,
     of any rights thereunder granted to the Grantee pursuant to the Plan.

     No amendment of this Plan shall increase the duties and responsibilities of
     the Trustee without its consent.

14.  Effective Date of this Plan

     The effective date of the Plan shall be that set out at the end of the
     Plan.

15.  Limitation of Liability

     No member of the Board or the Plan Committee, or any officer or employee of
     the Company acting on behalf of the Board or the Plan Committee, shall be
     personally liable for any action, determination or interpretation taken or
     made in good faith with respect to the Plan, and all members of the Board
     or the Committee and each and any officer or employee of the Company acting
     on their behalf shall, to the extent permitted by law, be fully indemnified
     and protected by the Company in respect of any such action, determination
     or interpretation.

16.  Governing Law and Jurisdiction

     This Plan shall be governed by and interpreted and construed in accordance
     with the laws of Bermuda and the Company and each Grantee hereby
     irrevocably submits to the exclusive jurisdiction of the courts of Bermuda.

<PAGE>
                                      -6-

          THIS DOCUMENT IS IMPORTANT AND SHOULD BE KEPT IN A SAFE PLACE

                               GLOBAL SOURCES LTD.

                             SHARE AWARD CERTIFICATE

           THE GLOBAL SOURCES EMPLOYEE EQUITY COMPENSATION PLAN NO. V

THIS IS TO CERTIFY that, on the date shown below, a grant of Shares was awarded
to the Grantee named below, subject to the provisions of the above-mentioned
Plan, as amended from time to time and to the Rules made pursuant thereto for
the time being in force, to receive the number of common shares of U.S. $0.01
each in the capital of Global Sources Ltd. specified below.

Grantee:              Name:
                                   ---------------------------------------
                      Address:
                                   ---------------------------------------

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

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

Date of Award:                     ---------------------------------------

Vesting Dates and amounts:         ---------------------------------------

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

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

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

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

Number of Shares:
                                    --------------

                                           For and on behalf of the Trustee

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

<PAGE>
                                      -7-

                                   SCHEDULE 1

Upon the awarding of Shares to the Grantee, such Shares shall not vest in the
Grantee but shall be held by the Trustee for the Grantee subject to the
following provisions and in accordance with the provisions of Schedule 2:

1.   The Grantee can direct the Trustee to transfer the Shares to the Grantee or
     to such person as the Grantee directs.

2.   The maximum number of Shares that may be issued to any individual any
     calendar year shall not exceed 25% of the aggregate number of Shares to be
     issued under the Plan.

<PAGE>
                                      -8-

                                   SCHEDULE 2

<TABLE>
<CAPTION>

     The One Time Grant of Shares will vest over five years in accordance with
the Schedule set out below.

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                      1 year after      2 years after      3 years after       4 years after      5 years after
                      Award Date        Award Date         Award Date          Award Date         Award Date
-------------------------------------------------------------------------------------------------------------------
<S>                         <C>         <C>                <C>                 <C>                <C>
Percentage of the           20%         An additional 20%  An additional 20%   An additional 20%  An additional 20%
Award which vests
-------------------------------------------------------------------------------------------------------------------
</TABLE>

     Where the percentage of the award which vests will give rise to the vesting
     of part shares, the portion shall be rounded up to the nearest whole share.

     The rights to Shares acquired by a Grantee under the Plan are not
     transferable until the Shares are vested, except in accordance with
     7(a)(iii).

<PAGE>
                                      -9-

     IN WITNESS WHEREOF the Company has caused its common seal to be hereunto
affixed in the presence of its duly authorised officers as of the 13th day of
March 2001.

The COMMON SEAL of                              )
TRADE MEDIA HOLDINGS LTD.                       )
was hereunto affixed in the presence of:        )

----------------------------------
DIRECTOR

----------------------------------
DIRECTOR/SECRETARYEXHIBIT 4.1

                                                                    CONFIDENTIAL
                                                                 ATTORNEY-CLIENT
                                                             PRIVILEGED DOCUMENT

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                                RIGHTS AGREEMENT

                                     BETWEEN

                        MILLENNIUM PHARMACEUTICALS, INC.

                                       AND

                      STATE STREET BANK AND TRUST COMPANY,

                                 AS RIGHTS AGENT

                               DATED APRIL 5, 2001

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<PAGE>

                                TABLE OF CONTENTS

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

Section 2.  Appointment of Rights Agent........................................5

Section 3.  Issuance of Rights.................................................6

Section 4.  Form of Rights Certificates........................................8

Section 5.  Countersignature and Registration..................................9

Section 6.  Transfer, Split Up, Combination and Exchange of Rights Certificates;
            Mutilated, Destroyed, Lost or Stolen Rights Certificates...........9

Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights.....10

Section 8.  Cancellation and Destruction of Rights Certificates...............12

Section 9.  Reservation and Availability of Capital Stock.....................12

Section 10. Preferred Stock Record Date.......................................14

Section 11. Adjustment of Purchase Price, Number and Kind of Shares or Number
            of Rights.........................................................14

Section 12. Certificate of Adjusted Purchase Price or Number of Shares........22

Section 13. Consolidation, Merger or Sale or Transfer of Assets or Earning
            Power.............................................................22

Section 14. Fractional Rights and Fractional Shares...........................24

Section 15. Rights of Action..................................................25

Section 16. Agreement of Rights Holders.......................................26

Section 17. Rights Certificate Holder Not Deemed a Stockholder................26

Section 18. Concerning the Rights Agent.......................................27

Section 19. Merger or Consolidation or Change of Name of Rights Agent.........27

Section 20. Duties of Rights Agent............................................28

Section 21. Change of Rights Agent............................................30

Section 22. Issuance of New Rights Certificates...............................30

Section 23. Redemption........................................................31

                                       i
<PAGE>

Section 24. Exchange..........................................................31

Section 25. Notice of Certain Events..........................................33

Section 26. Notices...........................................................33

Section 27. Supplements and Amendments........................................34

Section 28. Successors........................................................35

Section 29. Actions by the Board, etc.........................................35

Section 30. Benefits of this Agreement........................................35

Section 31. Severability......................................................35

Section 32. Governing Law.....................................................35

Section 33. Counterparts......................................................35

Section 34. Descriptive Headings..............................................36

Exhibit A  Form of Certificate of Designations of Series A Junior Participating
           Preferred Stock

Exhibit B  Form of Rights Certificate

Exhibit C  Summary of Preferred Stock Terms

                                       ii

<PAGE>

                                RIGHTS AGREEMENT

RIGHTS AGREEMENT, dated April 5, 2001 (the "Agreement"), between Millennium
Pharmaceuticals, Inc., a Delaware corporation (the "Company"), and State Street
Bank and Trust Company, as Rights Agent (the "Rights Agent").

                               W I T N E S S E T H
                               - - - - - - - - - -

WHEREAS, on April 5, 2001 the Board of Directors of the Company (the "Board")
authorized and declared a dividend distribution of one Right for each share of
Common Stock (as hereinafter defined) of the Company outstanding at the close of
business on April 16, 2001 (the "Record Date"), and authorized the issuance of
one Right (as such number may hereinafter be adjusted pursuant to the provisions
of Section 11(i) or Section 11(p) hereof) for each share of Common Stock of the
Company issued between the Record Date (whether originally issued or delivered
from the Company's treasury) and the earlier of the Distribution Date or the
Expiration Date, each Right initially representing the right to purchase one
one-thousandth of a share of Series A Junior Participating Preferred Stock of
the Company having the rights, powers and preferences set forth in the form of
Certificate of Designations attached hereto as EXHIBIT A, upon the terms and
subject to the conditions hereinafter set forth (the "Rights");

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

     Section 1.  CERTAIN DEFINITIONS.  For purposes of this Agreement, the
following terms have the meanings indicated:

             (a) "Acquiring Person" shall mean any Person who or which, together
with all Affiliates and Associates of such Person, shall be the Beneficial Owner
of 15% or more of the shares of Common Stock then outstanding, but shall not
include (i) the Company, (ii) any Subsidiary of the Company, (iii) any employee
benefit plan of the Company or of any Subsidiary of the Company, or (iv) any
Person organized, appointed or established by the Company for or pursuant to the
terms of any such plan. Notwithstanding the foregoing, (x) no Person shall
become an "Acquiring Person" as the result of an acquisition of Common Stock by
the Company which, by reducing the number of shares outstanding, increases the
proportionate number of shares beneficially owned by such Person to 15% or more
of the shares of Common Stock of the Company then outstanding; provided, however
that if a Person shall become the Beneficial Owner of 15% or more of the shares
of Common Stock of the Company then outstanding as the result of an acquisition
of Common Stock by the Company and shall, following written notice from, or
public disclosure by the Company of such share purchases by the Company become
the Beneficial Owner of any additional Common Stock of the Company and shall
then beneficially own 15% or more of the shares of Common Stock then
outstanding, then such Person shall be deemed to be an "Acquiring Person" and
(y) if the Board determines in good faith that a Person who would otherwise be
an "Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently, and such Person divests as
promptly as practicable (as determined in good faith by the Board of Directors),
but in any event within 15 Business Days, following receipt of written notice
from the Company of such event, of Beneficial Ownership of a sufficient number
of shares of Common Stock so that such Person

<PAGE>

would no longer be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a), then such Person shall not be deemed to be an
"Acquiring Person" for any purposes of this Agreement unless and until such
Person shall again become an "Acquiring Person."

             (b) "Act" shall mean the Securities Act of 1933, as amended.

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

             (d) "Adjustment Shares" shall have the meaning set forth in Section
11(a)(ii).

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

                 (i) which such Person or any of such Person's Affiliates or
             Associates, directly or indirectly, owns or has the right to
             acquire (whether such right is exercisable immediately or only
             after the passage of time) pursuant to any agreement, arrangement
             or understanding (other than customary agreements with and between
             underwriters and selling group members with respect to a bona fide
             public offering of securities), whether or not in writing, or upon
             the exercise of conversion rights, exchange rights, other rights,
             warrants or options, or otherwise; PROVIDED, HOWEVER, that a Person
             shall not be deemed the "Beneficial Owner" of, or to "beneficially
             own," (A) securities tendered pursuant to a tender or exchange
             offer made by or on behalf of such Person or any of such Person's
             Affiliates or Associates until such tendered securities are
             accepted for purchase or exchange, or (B) securities issuable upon
             exercise of Rights at any time prior to the occurrence of a
             Triggering Event, or (C) securities issuable upon exercise of
             Rights from and after the occurrence of a Triggering Event which
             Rights were acquired by such Person or any of such Person's
             Affiliates or Associates prior to the Distribution Date or pursuant
             to Section 3(a) or Section 22 hereof (the "Original Rights") or
             pursuant to Section 11(i) hereof in connection with an adjustment
             made with respect to any Original Rights;

                 (ii) which such Person or any of such Person's Affiliates or
             Associates, directly or indirectly, has the right to vote or
             dispose of or has "beneficial ownership" of (as determined pursuant
             to Rule 13d-3 of the General Rules and Regulations under the
             Exchange Act, or any comparable or successor rule), including
             pursuant to any agreement, arrangement or understanding (other than
             customary agreements with and between underwriters and selling
             group members with respect to a bona fide public offering of
             securities), whether or not in writing; PROVIDED, HOWEVER, that a
             Person shall not be deemed the "Beneficial Owner" of, or to
             "beneficially own," any security under this subparagraph (ii) as a
             result of an agreement, arrangement or understanding to vote such
             security if such agreement, arrangement or understanding: (A)
             arises solely from a revocable proxy or consent given in response
             to a public proxy or consent solicitation made

                                       2
<PAGE>

             pursuant to, and in accordance with, the applicable provisions of
             the General Rules and Regulations under the Exchange Act, and (B)
             is not then reportable by such Person on Schedule 13D under the
             Exchange Act (or any comparable or successor report); or

                 (iii) which are beneficially owned, directly or indirectly, by
             any other Person (or any Affiliate or Associate thereof) with which
             such Person (or any of such Person's Affiliates or Associates) has
             any agreement, arrangement or understanding (other than customary
             agreements with and between underwriters and selling group members
             with respect to a bona fide public offering of securities) whether
             or not in writing, for the purpose of acquiring, holding, voting
             (except pursuant to a revocable proxy or consent as described in
             the proviso to subparagraph (ii) of this paragraph (e)) or
             disposing of any voting securities of the Company.

For all purposes of this Agreement, any calculation of the number of shares of
Common Stock outstanding at any particular time, including for purposes of
determining the particular percentage of such outstanding shares of Common Stock
of which any Person is the Beneficial Owner, shall be made in accordance with
the last sentence of Rule 13d-3(d)(l)(i) of the General Rules and Regulations
under the Exchange Act.

             (f) "Board" shall have the meaning set forth in the WHEREAS clause
at the beginning of this Agreement.

             (g) "Business Day" shall mean any day other than a Saturday, Sunday
or a day on which banking institutions in the Commonwealth of Massachusetts are
authorized or obligated by law or executive order to close.

             (h) "Close of business" on any given date shall mean 5:00 p.m.,
Boston time, on such date; PROVIDED, HOWEVER, that if such date is not a
Business Day it shall mean 5:00 p.m., Boston time, on the next succeeding
Business Day.

             (i) "Common Stock" shall mean the common stock, $.001 par value, of
the Company, except that "Common Stock" when used with reference to any Person
other than the Company shall mean the capital stock of such Person with the
greatest voting power, or the equity securities or other equity interest having
power to control or direct the management, of such Person.

             (j) "Common stock equivalents" shall have the meaning set forth in
Section 11(a)(iii) hereof.

             (k) "Company" shall have the meaning set forth in the introductory
paragraph hereof.

             (l) "Current market price" shall have the meaning set forth in
Section 11(d)(i) hereof.

                                       3
<PAGE>

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

             (n) "Distribution Date" shall have the meaning set forth in Section
3(a) hereof.

             (o) "Equivalent Preferred Stock" shall have the meaning set forth
in Section 11(b) hereof.

             (p) "Exchange Act" shall have the meaning set forth in Section 1(c)
hereof.

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

             (r) "Expiration Date" shall have the meaning set forth in Section
7(a) hereof.

             (s) "Final Expiration Date" shall mean the close of business on
April 5, 2011.

             (t) "Permitted Offer" shall mean a tender offer or an exchange
offer for all outstanding shares of Common Stock at a price and on terms
determined, prior to the consummation of such tender offer or exchange offer, by
directors constituting at least 75% of all of the members of the Board, after
receiving advice from a nationally recognized investment banking firm selected
by the Board, to be (a) at a price that is fair to stockholders (taking into
account all factors which such members of the Board deem relevant including,
without limitation, prices which could reasonably be achieved if the Company or
its assets were sold on an orderly basis designed to realize maximum value) and
(b) otherwise in the best interests of the Company and its stockholders.

             (u) "Person" shall mean any individual, firm, corporation,
partnership, trust, association, limited liability company or other entity.

             (v) "Preferred Stock" shall mean shares of Series A Junior
Participating Preferred Stock, $.001 par value, of the Company having the rights
and preferences set forth in the form of Certificate of Designations attached to
this Agreement as EXHIBIT A and, to the extent that there is not a sufficient
number of shares of Series A Junior Participating Preferred Stock authorized to
permit the full exercise of the Rights, any other series of Preferred Stock,
$.001 par value, of the Company designated for such purpose containing terms
substantially similar to the terms of the Series A Junior Participating
Preferred Stock.

             (w) "Principal Party" shall have the meaning set forth in Section
13(b) hereof.

             (x) "Purchase Price" shall have the meaning set forth in Section
4(a) hereof.

             (y) "Record Date" shall have the meaning set forth in the WHEREAS
clause at the beginning of this Agreement.

             (z) "Redemption Date" shall have the meaning set forth in Section
7(a) hereof.

                                       4
<PAGE>

             (aa) "Redemption Price" shall have the meaning set forth in Section
23(a) hereof.

             (bb) "Rights" shall have the meaning set forth in the WHEREAS
clause at the beginning of this Agreement.

             (cc) "Rights Agent" shall have the meaning set forth in the
introductory paragraph hereof.

             (dd) "Rights Certificates" shall have the meaning set forth in
Section 3(a) hereof.

             (ee) "Section 11(a)(ii) Event" shall mean an acquisition of Common
Stock described in the first sentence of Section 11(a)(ii) hereof.

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

             (gg) "Section 13 Event" shall mean any event described in clauses
(x), (y) or (z) of Section 13(a) hereof.

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

             (ii) "Stock Acquisition Date" shall mean the first date of public
announcement (which, for purposes of this definition, shall include, without
limitation, a report filed pursuant to Section 13(d) under the Exchange Act) by
the Company or an Acquiring Person that an Acquiring Person has become such;
PROVIDED, HOWEVER that, if such Person is deemed not to be an "Acquiring Person"
pursuant to clause (y) of Section 1(a) hereof, no Stock Acquisition Date shall
be deemed to have occurred.

             (jj) "Subsidiary" shall mean, with reference to any Person, any
corporation or other entity of which an amount of voting securities sufficient
to elect at least a majority of the directors (or comparable body) of such
corporation or other entity is beneficially owned, directly or indirectly, by
such Person, or otherwise controlled by such Person.

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

             (ll) "Trading Day" shall have the meaning set forth in Section
11(d)(i) hereof.

             (mm) "Triggering Event" shall mean any Section 11(a)(ii) Event or
any Section 13 Event.

     Section 2.  APPOINTMENT OF RIGHTS AGENT. The Company hereby appoints
the Rights Agent to act as agent for the Company and the holders of the Rights
(who, in accordance with Section 3 hereof, shall prior to the Distribution Date
also be the holders of the Common Stock) in accordance with the terms and
conditions hereof, and the Rights Agent hereby accepts such appointment. The
Company may from time to time appoint such Co-Rights Agents as it may

                                       5
<PAGE>

deem necessary or desirable upon ten (10) days' prior written notice to the
Rights Agent. The Rights Agent shall have no duty to supervise, and shall in no
event be liable for, the acts or omissions of any such co-Rights Agent.

     Section 3.  ISSUANCE OF RIGHTS.

             (a) Until the earlier of (i) the close of business on the tenth
Business Day (or such later date as may be determined by the Board) after the
Stock Acquisition Date (or, if the tenth Business Day after the Stock
Acquisition Date occurs before the Record Date, the close of business on the
Record Date), or (ii) the close of business on the tenth Business Day (or such
later date as may be determined by action of the Board) after the date that a
tender or exchange offer (other than a Permitted Offer) by any Person (other
than the Company, any Subsidiary of the Company, any employee benefit plan of
the Company or of any Subsidiary of the Company, or any Person organized,
appointed or established by the Company for or pursuant to the terms of any such
plan) is first published or sent or given within the meaning of Rule 14d-2 of
the General Rules and Regulations under the Exchange Act, if upon consummation
thereof, such Person would be the Beneficial Owner of 15% or more of the shares
of Common Stock then outstanding (the earlier of (i) and (ii) being herein
referred to as the "Distribution Date"), (x) the Rights will be evidenced by the
certificates for the Common Stock registered in the names of the holders of the
Common Stock (which certificates for Common Stock shall be deemed also to be
certificates for Rights) and not by separate certificates, and (y) the Rights
will be transferable only in connection with the transfer of the underlying
shares of Common Stock (including a transfer to the Company). As soon as
practicable after the Distribution Date, the Rights Agent will send by
first-class, insured, postage prepaid mail, to each record holder of the Common
Stock as of the close of business on the Distribution Date, at the address of
such holder shown on the records of the Company, one or more rights
certificates, in substantially the form of EXHIBIT B hereto (the "Rights
Certificates"), evidencing one Right for each share of Common Stock so held,
subject to adjustment as provided herein. With respect to certificates for the
Common Stock outstanding as of the close of business on the Record Date, until
the Distribution Date, the Rights will be evidenced by such certificates for the
Common Stock and the registered holders of the Common Stock shall also be the
registered holders of the associated Rights. In addition, in connection with the
issuance or sale of shares of Common Stock following the Distribution Date and
prior to the redemption or expiration of the Rights, the Company (i) shall, with
respect to shares of Common Stock so issued or sold pursuant to the exercise of
stock options or under any employee benefit plan or arrangement, or upon the
exercise, conversion or exchange of securities granted or issued by the Company
prior to the Distribution Date, and (ii) may, in any other case, if deemed
necessary or appropriate by the Board, issue Rights Certificates representing
the appropriate number of Rights in connection with such issuance or sale;
provided, however, that (x) no such Rights Certificate shall be issued if, and
to the extent that, the Company shall be advised by counsel that such issuance
would create a significant risk of material adverse tax consequences to the
Company or the Person to whom such Rights Certificate would be issued, and (y)
no such Rights Certificate shall be issued if, and to the extent that,
appropriate adjustment shall otherwise have been made in lieu of the issuance
thereof. In the event that an adjustment in the number of Rights per share of
Common Stock has been made pursuant to Sections 11(i) or 11(p) hereof, at the
time of distribution of the Rights Certificates, the Company shall make the
necessary and appropriate rounding adjustments (in accordance with Section 14(a)
hereof) so that Rights Certificates representing only whole

                                       6
<PAGE>

numbers of Rights are distributed and cash is paid in lieu of any fractional
Rights. As of and after the Distribution Date, the Rights will be evidenced
solely by such Rights Certificates.

             (b) As promptly as practicable following the Record Date, the
Company will send a copy of a Summary of Rights to Purchase Preferred Stock, in
substantially the form attached hereto as EXHIBIT C, by first-class, postage
prepaid mail, to each record holder of the Common Stock as of the close of
business on the Record Date, at the address of such holder shown on the records
of the Company. The failure to send a copy of the Summary of Rights shall not
affect the enforceability of any part of this Rights Agreement or the rights of
any holder of the Rights.

             (c) Rights shall be issued (i) in respect of all shares of Common
Stock that are issued (either as an original issuance or from the Company's
treasury) after the Record Date but prior to the earlier of the Distribution
Date or the Expiration Date and (ii) in connection with the issuance or sale of
shares of Common Stock following the Distribution Date and prior to the
redemption or expiration of the Rights (x) with respect to shares of Common
Stock so issued or sold pursuant to the exercise of stock options or under any
employee benefit plan or arrangement, or upon the exercise, conversion or
exchange of securities, granted or issued by the Company prior to the
Distribution Date and (y) with respect to shares of Common Stock so issued or
sold in any other case, if deemed necessary or appropriate by the Board.
Certificates representing such shares of Common Stock (including, without
limitation, certificates issued upon transfer or exchange of Common Stock) shall
also be deemed to be certificates for Rights, and shall bear the following
legend:

         This certificate also evidences and entitles the holder hereof
         to certain Rights as set forth in the Rights Agreement between
         Millennium Pharmaceuticals, Inc. ( the "Company") and State
         Street Bank and Trust Company (the "Rights Agent") dated April
         5, 2001, as the same may be amended, restated or renewed from
         time to time (the "Rights Agreement"), the terms of which are
         hereby incorporated herein by reference and a copy of which is
         on file at the principal offices of the Company. Under certain
         circumstances, as set forth in the Rights Agreement, such
         Rights will be evidenced by separate certificates and will no
         longer be evidenced by this certificate. The Company will mail
         to the holder of this certificate a copy of the Rights
         Agreement, as in effect on the date of mailing, without charge
         promptly after receipt of a written request therefor. Under
         certain circumstances set forth in the Rights Agreement,
         Rights issued to, or held by, any Person who is, was or
         becomes an Acquiring Person or any Affiliate or Associate
         thereof (as such terms are defined in the Rights Agreement),
         whether currently held by or on behalf of such Person or by
         any subsequent holder, may become null and void.

With respect to such certificates containing the foregoing legend, until the
earlier of (i) the Distribution Date and (ii) the Expiration Date, the Rights
associated with the Common Stock represented by such certificates shall be
evidenced by such certificates alone and registered

                                       7
<PAGE>

holders of Common Stock shall also be the registered holders of the associated
Rights. Notwithstanding this Section 3(c), the omission of a legend shall not
affect the enforceability of any part of this Rights Agreement or the rights of
any holder of the Rights.

             (d) Until the earlier of the Distribution Date and the Expiration
Date, the transfer of any certificates representing shares of Common Stock in
respect of which Rights have been issued shall also constitute the transfer of
the Rights associated with such shares of Common Stock. In the event that the
Company purchases or acquires any shares of Common Stock after the Record Date
but prior to the Distribution Date, any Rights associated with such shares of
Common Stock shall be deemed cancelled and retired so that the Company shall not
be entitled to exercise any Rights associated with the shares of Common Stock
which are no longer outstanding.

     Section 4.  FORM OF RIGHTS CERTIFICATES.

             (a) The Rights Certificates (and the forms of election to purchase,
certification and assignment to be printed on the reverse thereof) shall each be
substantially in the form set forth in EXHIBIT B hereto and may have such marks
of identification or designation and such legends, summaries or endorsements
printed thereon as the Company may deem appropriate and as are not inconsistent
with the provisions of this Agreement, or as may be required to comply with any
applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any stock exchange or over-the-counter market on which the
Rights may from time to time be listed, or to conform to usage. Subject to the
provisions of Sections 7, 11 and 22 hereof, the Rights Certificates, whenever
distributed, shall entitle the holders thereof to purchase such number of one
one-thousandths of a share of Preferred Stock as shall be set forth therein at
the price set forth therein (such exercise price per one one-thousandth of a
share, the "Purchase Price"), but the amount and type of securities purchasable
upon the exercise of each Right and the Purchase Price thereof shall be subject
to adjustment as provided herein.

             (b) Any Rights Certificate issued pursuant to Section 3, Section
11(i) or Section 22 hereof that represents Rights beneficially owned by persons
known to be: (i) an Acquiring Person or an Associate or Affiliate of an
Acquiring Person, (ii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee after the Acquiring Person
becomes such, or (iii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee prior to or concurrently with
the Acquiring Person becoming such and receives such Rights pursuant to either
(A) a transfer (whether or not for consideration) from the Acquiring Person to
holders of equity interests in such Acquiring Person or to any Person with whom
such Acquiring Person has any continuing agreement, arrangement or understanding
(whether or not in writing) regarding the transferred Rights or (B) a transfer
which the Board has determined is part of a plan, arrangement or understanding
(whether or not in writing) that has as a primary purpose or effect avoidance of
Section 7(e) hereof, and any Rights Certificate issued pursuant to Section 6 or
Section 11 hereof upon transfer, exchange, replacement or adjustment of any
other Rights Certificate referred to in this sentence, shall contain (to the
extent feasible) the following legend:

                                       8
<PAGE>

         The Rights represented by this Rights Certificate are or were
         beneficially owned by a Person who was or became an Acquiring
         Person or an Affiliate or Associate of an Acquiring Person (as
         such terms are defined in the Rights Agreement). Accordingly,
         this Rights Certificate and the Rights represented hereby may
         become null and void in the circumstances specified in Section
         7(e) of such Agreement.

The provisions of Section 7(e) hereof shall be operative whether or not the
foregoing legend is contained on any such Rights Certificate.

     Section 5.  COUNTERSIGNATURE AND REGISTRATION.

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

             (b) Following the Distribution Date, the Rights Agent shall keep or
cause to be kept, at its office designated as the appropriate place for
surrender of Rights Certificates upon exercise or transfer, books for
registration and transfer of the Rights Certificates issued hereunder. Such
books shall show the names and addresses of the respective holders of the Rights
Certificates, the number of Rights evidenced on its face by each of the Rights
Certificates, the Rights Certificate number and the date of each of the Rights
Certificates.

     Section 6.  TRANSFER, SPLIT UP, COMBINATION AND EXCHANGE OF RIGHTS
CERTIFICATES; MUTILATED, DESTROYED, LOST OR STOLEN RIGHTS CERTIFICATES.

             (a) Subject to the provisions of Section 4(b), Section 7(e) and
Section 14 hereof, at any time after the close of business on the Distribution
Date, and at or prior to the close of business on the Expiration Date, any
Rights Certificate or Certificates (other than Rights Certificates representing
Rights that have become void pursuant to Section 7(e) hereof or that have been
exchanged pursuant to Section 24 hereof) may be transferred, split up, combined
or exchanged for another Rights Certificate or Certificates, entitling the
registered holder to purchase a like number of one one-thousandths of a share of
Preferred Stock (or, following a Triggering Event, Common Stock, other
securities, cash or other assets, as the case may be) as

                                       9
<PAGE>

the Rights Certificate or Certificates surrendered then entitled such holder
(or former holder in the case of a transfer) to purchase. Any registered holder
desiring to transfer, split up, combine or exchange any Rights Certificate or
Certificates shall make such request in writing delivered to the Rights Agent,
and shall surrender the Rights Certificate or Certificates to be transferred,
split up, combined or exchanged, with the form of assignment and certificate
appropriately executed, at the office of the Rights Agent designated for such
purpose. Neither the Rights Agent nor the Company shall be obligated to take any
action whatsoever with respect to the transfer of any such surrendered Rights
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Rights Certificate and shall have provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request. Thereupon the Rights
Agent shall, subject to Section 4(b), Section 7(e) and Section 14 hereof,
countersign and deliver to the Person entitled thereto a Rights Certificate or
Rights Certificates, as the case may be, as so requested. The Company may
require payment of a sum sufficient to cover any tax or governmental charge that
may be imposed in connection with any transfer, split up, combination or
exchange of Rights Certificates.

             (b) Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate, and, in case of loss, theft or destruction, of indemnity
or security reasonably satisfactory to them, and reimbursement to the Company
and the Rights Agent of all reasonable expenses incidental thereto, and upon
surrender to the Rights Agent and cancellation of the Rights Certificate if
mutilated, the Company will execute and deliver a new Rights Certificate of like
tenor to the Rights Agent for countersignature and delivery to the registered
owner in lieu of the Rights Certificate so lost, stolen, destroyed or mutilated.

     Section 7.  EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF RIGHTS.

             (a) Subject to Section 7(e) hereof, the registered holder of any
Rights Certificate may exercise the Rights evidenced thereby (except as
otherwise provided herein including, without limitation, the restrictions on
exercisability set forth in Section 9(c), Section 11(a)(iii) and Section 23
hereof) in whole or in part at any time after the Distribution Date upon
surrender of the Rights Certificate, with the form of election to purchase and
the certificate on the reverse side thereof duly executed, to the Rights Agent
at the office of the Rights Agent designated for such purpose, together with
payment of the aggregate Purchase Price with respect to the total number of one
one-thousandths of a share of Preferred Stock (or other shares, securities, cash
or other assets, as the case may be) as to which such surrendered Rights are
then exercisable, at or prior to the earliest of (i) the Final Expiration Date,
(ii) the time at which the Rights expire as provided in Section 13(d) hereof,
(iii) the time at which the Rights are redeemed as provided in Section 23 hereof
(the "Redemption Date") and (iv) the time at which such Rights are exchanged as
provided in Section 24 hereof (the earliest of (i), (ii), (iii) and (iv) being
herein referred to as the "Expiration Date").

             (b) The Purchase Price for each one one-thousandth of a share of
Preferred Stock pursuant to the exercise of a Right shall initially be $200 and
shall be subject to adjustment from time to time as provided in Sections 11 and
13(a) hereof and shall be payable in lawful money of the United States of
America in accordance with paragraph (c) below.

                                       10
<PAGE>

             (c) Upon receipt of a Rights Certificate representing exercisable
Rights, with the form of election to purchase and the certificate duly executed,
accompanied by payment, with respect to each Right so exercised, of the Purchase
Price per one one-thousandth of a share of Preferred Stock (or other shares,
securities, cash or other assets, as the case may be) to be purchased and an
amount equal to any applicable transfer tax, the Rights Agent shall, subject to
Section 20(k) hereof, thereupon promptly (i) (A) requisition from any transfer
agent of the shares of Preferred Stock (or make available, if the Rights Agent
is the transfer agent for such shares) certificates for the total number of one
one-thousandths of a share of Preferred Stock to be purchased and the Company
hereby authorizes its transfer agent to comply with such requests, or (B) if the
Company shall have elected to deposit the total number of shares of Preferred
Stock issuable upon exercise of the Rights hereunder with a depositary agent,
requisition from the depositary agent depositary receipts representing such
number of one one-thousandths of a share of Preferred Stock as are to be
purchased (in which case certificates for the shares of Preferred Stock
represented by such receipts shall be deposited by the transfer agent with the
depositary agent) and the Company hereby directs the depositary agent to comply
with such requests, (ii) requisition from the Company the amount of cash, if
any, to be paid in lieu of fractional shares in accordance with Section 14
hereof, (iii) after receipt of such certificates or depositary receipts, cause
the same to be delivered to or upon the order of the registered holder of such
Rights Certificate, registered in such name or names as may be designated by
such holder, and (iv) after receipt thereof, deliver such cash, if any, to or
upon the order of the registered holder of such Rights Certificate. The payment
of the Purchase Price (as such amount may be reduced pursuant to Section
11(a)(iii) hereof) may be made in cash or by certified bank check or money order
payable to the order of the Company. In the event that the Company is obligated
to issue other securities (including Common Stock) of the Company, pay cash
and/or distribute other property pursuant to Section 11(a) hereof, the Company
shall make all arrangements necessary so that such other securities, cash and/or
other property are available for distribution by the Rights Agent, if and when
appropriate.

             (d) In case the registered holder of any Rights Certificate shall
exercise less than all the Rights evidenced thereby, a new Rights Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the Rights Agent and delivered to, or upon the order of, the registered
holder of such Rights Certificate, registered in such name or names as may be
designated by such holder, subject to the provisions of Section 14 hereof.

             (e) Notwithstanding anything in this Agreement to the contrary,
from and after the first occurrence of a Section 11(a)(ii) Event, any Rights
beneficially owned by (i) an Acquiring Person or any Associate or Affiliate of
an Acquiring Person, (ii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee after the Acquiring Person
becomes such, or (iii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee prior to or concurrently with
the Acquiring Person becoming such and receives such Rights pursuant to either
(A) a transfer (whether or not for consideration) from the Acquiring Person to
holders of equity interests in such Acquiring Person or to any Person with whom
the Acquiring Person has any continuing agreement, arrangement or understanding
(whether or not in writing) regarding the transferred Rights or (B) a transfer
which the Board has determined is part of a plan, arrangement or understanding
(whether or not in writing) that has as a primary purpose or effect avoidance of
this Section 7(e), shall become null and void without any further action and no
holder of such Rights shall have

                                       11
<PAGE>

any rights whatsoever with respect to such Rights, whether under any provision
of this Agreement or otherwise. No Rights Certificate shall be issued at any
time upon the transfer of any Rights to an Acquiring Person whose Rights would
be void pursuant to the preceding sentence or any Associate or Affiliate thereof
or to any nominee of such Acquiring Person, Associate or Affiliate; and any
Rights Certificate delivered to the Rights Agent for transfer to an Acquiring
Person whose Rights would be void pursuant to the preceding sentence shall be
cancelled. The Company shall use all reasonable efforts to insure that the
provisions of this Section 7(e) and Section 4(b) hereof are complied with, but
shall have no liability to any holder of Rights Certificates or other Person as
a result of its failure to make any determinations with respect to an Acquiring
Person or its Affiliates, Associates or transferees hereunder.

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

     Section 8.  CANCELLATION AND DESTRUCTION OF RIGHTS CERTIFICATES. All Rights
Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or any of its
agents, be delivered to the Rights Agent for cancellation or in cancelled form,
or, if surrendered to the Rights Agent, shall be cancelled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any other Rights Certificate purchased or acquired by the Company
otherwise than upon the exercise thereof. The Rights Agent shall deliver all
cancelled Rights Certificates to the Company, or shall, at the written request
of the Company, destroy such cancelled Rights Certificates, and in such case
shall deliver a certificate of destruction thereof to the Company.

     Section 9.  RESERVATION AND AVAILABILITY OF CAPITAL STOCK.

             (a) The Company covenants and agrees that it will cause to be
reserved and kept available out of its authorized and unissued shares of
Preferred Stock (and, following the occurrence of a Section 11(a)(ii) Event, out
of its authorized and unissued shares of Common Stock and/or other securities or
out of its authorized and issued shares held in its treasury), the number of
shares of Preferred Stock (and, following the occurrence of a Section 11(a)(ii)
Event, Common Stock and/or other securities) that, as provided in this Agreement
including Section 11(a)(iii) hereof, will be sufficient to permit the exercise
in full of all outstanding Rights.

             (b) So long as the shares of Preferred Stock (and, following the
occurrence of a Section 11(a)(ii) Event, Common Stock and/or other securities)
issuable and deliverable upon the exercise of the Rights may be listed on any
national securities exchange or automated quotation system, the Company shall
use its best efforts to cause, from and after such time as the

                                       12
<PAGE>

Rights become exercisable, all shares reserved for such issuance to be so listed
upon official notice of issuance upon such exercise.

             (c) The Company shall use its best efforts to (i) file, as soon as
practicable following the earliest date after the first occurrence of a Section
11(a)(ii) Event on which the consideration to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iii)
hereof, or as soon as is required by law following the Distribution Date, as the
case may be, a registration statement under the Act, with respect to the
securities purchasable upon exercise of the Rights on an appropriate form, (ii)
cause such registration statement to become effective as soon as practicable
after such filing, (iii) cause such registration statement to remain effective
(with a prospectus at all times meeting the requirements of the Act) until the
earlier of (A) the date as of which the Rights are no longer exercisable for
such securities, and (B) the Expiration Date, and (iv) obtain such regulatory
approvals as may be necessary for it to issue securities purchasable upon the
exercise of the Rights. The Company will also take such action as may be
appropriate under, or to ensure compliance with, the securities or "blue sky"
laws of the various states in connection with the exercisability of the Rights.
The Company may temporarily suspend, for a period of time not to exceed ninety
(90) days after the date set forth in clause (i) of the first sentence of this
Section 9(c), the exercisability of the Rights in order to prepare and file such
registration statement and permit it to become effective or to obtain any other
required regulatory approval in connection with the exercisability of the
Rights. Upon any such suspension, the Company shall issue a public announcement
stating that the exercisability of the Rights has been temporarily suspended, as
well as a public announcement at such time as the suspension is no longer in
effect. Notwithstanding any provision of this Agreement to the contrary, the
Rights shall not be exercisable in any jurisdiction unless the requisite
registration or qualification in such jurisdiction shall have been effected or
obtained.

             (d) The Company covenants and agrees that it will take all such
action as may be necessary to ensure that all one one-thousandths of a share of
Preferred Stock (and, following the occurrence of a Section 11(a)(ii) Event,
Common Stock and/or other securities) delivered upon exercise of Rights shall,
at the time of delivery of the certificates for such shares (subject to payment
of the Purchase Price), be duly and validly authorized and issued and fully paid
and nonassessable.

             (e) The Company further covenants and agrees that it will pay when
due and payable any and all federal and state transfer taxes and charges that
may be payable in respect of the issuance or delivery of the Rights Certificates
and of any certificates for a number of one one-thousandths of a share of
Preferred Stock (or Common Stock and/or other securities, as the case may be)
upon the exercise of Rights. The Company shall not, however, be required (i) to
pay any transfer tax that may be payable in respect of any transfer or delivery
of Rights Certificates to a Person other than, or the issuance or delivery of a
number of one one-thousandths of a share of Preferred Stock (or Common Stock
and/or other securities, as the case may be) in respect of a name other than
that of, the registered holder of the Rights Certificate evidencing Rights
surrendered for exercise or (ii) to issue or deliver any certificates for a
number of one one-thousandths of a share of Preferred Stock (or Common Stock
and/or other securities, as the case may be) in a name other than that of the
registered holder upon the exercise of any Rights until such tax shall have been
paid (any such tax being payable by the holder of such

                                       13
<PAGE>

Rights Certificate at the time of surrender) or until it has been established to
the Company's satisfaction that no such tax is due.

     Section 10. PREFERRED STOCK RECORD DATE. Each Person in whose name any
certificate for a number of one one-thousandths of a share of Preferred Stock
(or Common Stock and/or other securities, as the case may be) is issued upon the
exercise of Rights shall for all purposes be deemed to have become the holder of
record of such fractional shares of Preferred Stock (or Common Stock and/or
other securities, as the case may be) represented thereby on, and such
certificate shall be dated, the date upon which the Rights Certificate
evidencing such Rights was duly surrendered with the forms of election and
certification duly executed and payment of the Purchase Price (and all
applicable transfer taxes) was made; PROVIDED, HOWEVER, that if the date of such
surrender and payment is a date upon which the Preferred Stock (or Common Stock
and/or other securities, as the case may be) transfer books of the Company are
closed, such Person shall be deemed to have become the record holder of such
shares (fractional or otherwise) on, and such certificate shall be dated, the
next succeeding Business Day on which the Preferred Stock (or Common Stock
and/or other securities, as the case may be) transfer books of the Company are
open. Prior to the exercise of the Rights evidenced thereby, the holder of a
Rights Certificate, as such, shall not be entitled to any rights of a
stockholder of the Company with respect to securities for which the Rights shall
be exercisable, including, without limitation, the right to vote, to receive
dividends or other distributions or to exercise any preemptive rights, and shall
not be entitled to receive any notice of any proceedings of the Company, except
as provided herein.

     Section 11. ADJUSTMENT OF PURCHASE PRICE, NUMBER AND KIND OF SHARES OR
NUMBER OF RIGHTS. The Purchase Price, the number and kind of shares covered by
each Right and the number of Rights outstanding are subject to adjustment from
time to time as provided in this Section 11.

                 (a)(i) In the event the Company shall at any time after the
             date of this Agreement (A) declare a dividend on the Preferred
             Stock payable in shares of Preferred Stock, (B) subdivide the
             outstanding Preferred Stock, (C) combine the outstanding Preferred
             Stock into a smaller number of shares, or (D) issue any shares of
             its capital stock in a reclassification of the Preferred Stock
             (including any such reclassification in connection with a
             consolidation or merger in which the Company is the continuing or
             surviving corporation), except as otherwise provided in this
             Section 11(a) and Section 7(e) hereof, the Purchase Price in effect
             at the time of the record date for such dividend or of the
             effective date of such subdivision, combination or
             reclassification, and the number and kind of shares of Preferred
             Stock or capital stock, as the case may be, issuable on such date,
             shall be proportionately adjusted so that the holder of any Right
             exercised after such time shall be entitled to receive, upon
             payment of the Purchase Price then in effect, the aggregate number
             and kind of shares of Preferred Stock or capital stock, as the case
             may be, which, if such Right had been exercised immediately prior
             to such date and at a time when the Preferred Stock transfer books
             of the Company were open, he would have owned upon such exercise
             and been entitled to receive by virtue of such dividend,
             subdivision, combination or reclassification. If an event occurs
             that would require an adjustment under both this

                                       14
<PAGE>

             Section 11(a)(i) and Section 11(a)(ii) hereof, the adjustment
             provided for in this Section 11(a)(i) shall be in addition to, and
             shall be made prior to, any adjustment required pursuant to
             Section 11(a)(ii) hereof.

                 (ii) Subject to Section 24 of this Agreement, in the event that
             any Person, alone or together with its Affiliates or Associates,
             becomes an Acquiring Person (other than pursuant to a Permitted
             Offer), then, promptly following the first occurrence of such
             event, proper provision shall be made so that each holder of a
             Right (except as provided below and in Section 7(e) hereof) shall
             thereafter have the right to receive (subject to the last sentence
             of Section 23(a)), upon exercise thereof at the then current
             Purchase Price in accordance with the terms of this Agreement, in
             lieu of a number of one one-thousandths of a share of Preferred
             Stock, such number of shares of Common Stock of the Company that
             equals the result obtained by (x) multiplying the then current
             Purchase Price by the then number of one one-thousandths of a share
             of Preferred Stock for which a Right was exercisable immediately
             prior to the first occurrence of a Section 11(a)(ii) Event, and (y)
             dividing that product (which, following such first occurrence,
             shall thereafter be referred to as the "Purchase Price" for each
             Right and for all purposes of this Agreement) by 50% of the current
             market price (determined pursuant to Section 11(d) hereof) per
             share of Common Stock on the date of such first occurrence (such
             number of shares, the "Adjustment Shares").

                 (iii) In the event that the number of shares of Common Stock
             that are authorized by the Company's Certificate of Incorporation
             but not outstanding or reserved for issuance for purposes other
             than upon exercise of the Rights are not sufficient to permit the
             exercise in full of the Rights in accordance with the foregoing
             subparagraph (ii) of this Section 11(a), the Company shall: (A)
             determine the excess of (1) the value of the Adjustment Shares
             issuable upon the exercise of a Right (the "Current Value") over
             (2) the Purchase Price (such excess, the "Spread"), and (B) with
             respect to each Right, make adequate provision to substitute for
             the Adjustment Shares, upon payment of the applicable Purchase
             Price, (1) cash, (2) a reduction in the Purchase Price, (3) Common
             Stock or other equity securities of the Company (including, without
             limitation, shares, or units of shares, of preferred stock which
             the Board has deemed to have the same value as shares of Common
             Stock (such shares of preferred stock, "common stock
             equivalents")), (4) debt securities of the Company, (5) other
             assets, or (6) any combination of the foregoing, having an
             aggregate value equal to the Current Value, where such aggregate
             value has been determined by the Board based upon the advice of a
             nationally recognized investment banking firm selected by the
             Board; PROVIDED, HOWEVER, if the Company shall not have made
             adequate provision to deliver value pursuant to clause (B) above
             within thirty (30) days following the later of (x) the first
             occurrence of a Section 11(a)(ii) Event and (y) the date on which
             the Company's right of redemption pursuant to Section 23(a) expires
             (the later of (x) and (y) being referred to herein as the "Section
             11(a)(ii) Trigger Date"), then the Company shall be obligated to
             deliver, upon the surrender for exercise of a Right and without
             requiring payment of the Purchase Price, shares of Common Stock (to
             the extent available) and then, if necessary,

                                       15
<PAGE>

             cash, which shares and/or cash have an aggregate value equal to
             the Spread. If the Board shall determine in good faith that it is
             likely that sufficient additional shares of Common Stock could be
             authorized for issuance upon exercise in full of the Rights, the
             thirty (30) day period set forth above may be extended to the
             extent necessary, but not more than ninety (90) days after the
             Section 11(a)(ii) Trigger Date, in order that the Company may seek
             shareholder approval for the authorization of such additional
             shares (such period, as it may be extended, the "Substitution
             Period"). To the extent that the Company determines that some
             action need be taken pursuant to the first and/or second sentences
             of this Section 11(a)(iii), the Company (x) shall provide, subject
             to Section 7(e) hereof, that such action shall apply uniformly to
             all outstanding Rights, and (y) may suspend the exercisability of
             the Rights until the expiration of the Substitution Period in order
             to seek any authorization of additional shares and/or to decide the
             appropriate form of distribution to be made pursuant to such first
             sentence and to determine the value thereof. In the event of any
             such suspension, the Company shall issue a public announcement
             stating that the exercisability of the Rights has been temporarily
             suspended, as well as a public announcement at such time as the
             suspension is no longer in effect. For purposes of this Section
             11(a)(iii), the value of the Common Stock shall be the current
             market price (as determined pursuant to Section 11(d) hereof) per
             share of the Common Stock on the Section 11(a)(ii) Trigger Date and
             the value of any "common stock equivalent" shall be deemed to have
             the same value as the Common Stock on such date.

             (b) In case the Company shall fix a record date for the issuance of
rights, options or warrants to all holders of Preferred Stock entitling them to
subscribe for or purchase (for a period expiring within forty-five (45) calendar
days after such record date) Preferred Stock (or shares having the same rights,
privileges and preferences as the shares of Preferred Stock ("equivalent
preferred stock")) or securities convertible into Preferred Stock or equivalent
preferred stock at a price per share of Preferred Stock or per share of
equivalent preferred stock (or having a conversion price per share, if a
security convertible into Preferred Stock or equivalent preferred stock) less
than the current market price (as determined pursuant to Section 11(d) hereof)
per share of Preferred Stock on such record date, the Purchase Price to be in
effect after such record date shall be determined by multiplying the Purchase
Price in effect immediately prior to such record date by a fraction, the
numerator of which shall be the number of shares of Preferred Stock outstanding
on such record date, plus the number of shares of Preferred Stock which the
aggregate offering price of the total number of shares of Preferred Stock and/or
equivalent preferred stock so to be offered (and/or the aggregate initial
conversion price of the convertible securities so to be offered) would purchase
at such current market price, and the denominator of which shall be the number
of shares of Preferred Stock outstanding on such record date, plus the number of
additional shares of Preferred Stock and/or equivalent preferred stock to be
offered for subscription or purchase (or into which the convertible securities
so to be offered are initially convertible). In case such subscription price may
be paid by delivery of consideration part or all of which may be in a form other
than cash, the value of such consideration shall be as determined in good faith
by the Board, whose determination shall be described in a statement filed with
the Rights Agent and shall be conclusive for all purposes. Shares of Preferred
Stock owned by or held for the account of the Company shall not be deemed
outstanding for the purpose of any such computation. Such adjustment shall be
made

                                       16
<PAGE>

successively whenever such a record date is fixed, and in the event that
such rights, options or warrants are not so issued, the Purchase Price shall be
adjusted to be the Purchase Price which would then be in effect if such record
date had not been fixed.

             (c) In case the Company shall fix a record date for a distribution
to all holders of Preferred Stock (including any such distribution made in
connection with a consolidation or merger in which the Company is the continuing
corporation) of evidences of indebtedness, cash (other than a regular quarterly
cash dividend out of the earnings or retained earnings of the Company), assets
(other than a dividend payable in Preferred Stock, but including any dividend
payable in stock other than Preferred Stock) or subscription rights or warrants
(excluding those referred to in Section 11(b) hereof), the Purchase Price to be
in effect after such record date shall be determined by multiplying the Purchase
Price in effect immediately prior to such record date by a fraction, the
numerator of which shall be the current market price (as determined pursuant to
Section 11(d) hereof) per share of Preferred Stock on such record date, less the
fair market value (as determined in good faith by the Board, whose determination
shall be described in a statement filed with the Rights Agent and shall be
conclusive for all purposes) of the portion of the cash, assets or evidences of
indebtedness so to be distributed or of such subscription rights or warrants
applicable to a share of Preferred Stock and the denominator of which shall be
such current market price (as determined pursuant to Section 11(d) hereof) per
share of Preferred Stock on such record date. Such adjustments shall be made
successively whenever such a record date is fixed, and in the event that such
distribution is not so made, the Purchase Price shall be adjusted to be the
Purchase Price which would have been in effect if such record date had not been
fixed.

                 (d)(i) For the purpose of any computation hereunder, other than
             computations made pursuant to Section 11(a)(iii) hereof, the
             "current market price" per share of Common Stock on any date shall
             be deemed to be the average of the daily closing prices per share
             of such Common Stock for the thirty (30) consecutive Trading Days
             (as such term is hereinafter defined) immediately prior to such
             date, and for purposes of computations made pursuant to Section
             11(a)(iii) hereof, the "current market price" per share of Common
             Stock on any date shall be deemed to be the average of the daily
             closing prices per share of such Common Stock for the ten (10)
             consecutive Trading Days immediately following such date; PROVIDED,
             HOWEVER, that in the event that the current market price per share
             of the Common Stock is determined during a period following the
             announcement by the issuer of such Common Stock of (A) a dividend
             or distribution on such Common Stock payable in shares of such
             Common Stock or securities convertible into shares of such Common
             Stock (other than the Rights), or (B) any subdivision, combination
             or reclassification of such Common Stock, and prior to the
             expiration of the requisite thirty (30) Trading Day or ten (10)
             Trading Day period, as set forth above, after the ex-dividend date
             for such dividend or distribution, or the record date for such
             subdivision, combination or reclassification occurs, then, and in
             each such case, the "current market price" shall be properly
             adjusted to take into account ex-dividend or post record date
             trading. The closing price for each day shall be the last sale
             price, regular way, or, in case no such sale takes place on such
             day, the average of the closing bid and asked prices, regular way,
             in either case as reported in the principal consolidated
             transaction reporting system with respect to securities listed or
             admitted to trading on the principal national

                                       17
<PAGE>

             securities exchange on which the shares of Common Stock are
             listed or admitted to trading or, if the shares of Common Stock are
             not listed or admitted to trading on any national securities
             exchange, the last quoted price or, if not so quoted, the average
             of the high bid and the low asked prices in the over-the-counter
             market, as reported by The Nasdaq Stock Market, Inc. ("Nasdaq") or
             such other system then in use, or, if on any such date the shares
             of Common Stock are not quoted by any such organization, the
             average of the closing bid and asked prices as furnished by a
             professional market maker making a market in the Common Stock
             selected by the Board. All references in this Section to closing
             prices, last quoted prices or other stock prices mean prices during
             regular trading hours, without giving affect to any after-hours or
             extended hours trading. If on any such date no market maker is
             making a market in the Common Stock, the fair value of such shares
             on such date as determined in good faith by the Board, whose
             determination shall be described in a statement filed with the
             Rights Agent and shall be conclusive for all purposes. The term
             "Trading Day" shall mean a day on which Nasdaq or any national
             securities exchange on which the shares of Common Stock are listed
             or admitted to trading is open for the transaction of business or,
             if the shares of Common Stock are not listed or admitted to trading
             on Nasdaq or any national securities exchange, a Business Day. If
             the Common Stock is not publicly held or not so listed or traded,
             "current market price" per share shall mean the fair value per
             share as determined in good faith by the Board, whose determination
             shall be described in a statement filed with the Rights Agent and
             shall be conclusive for all purposes.

                 (ii) For the purpose of any computation hereunder, the "current
             market price" per share of Preferred Stock shall be determined in
             the same manner as set forth above for the Common Stock in clause
             (i) of this Section 11(d) (other than the last sentence thereof).
             If the current market price per share of Preferred Stock cannot be
             determined in the manner provided above or if the Preferred Stock
             is not publicly held or listed or traded in a manner described in
             clause (i) of this Section 11(d), the "current market price" per
             share of Preferred Stock shall be conclusively deemed to be an
             amount equal to 1000 (as such number may be appropriately adjusted
             for such events as stock splits, stock dividends and
             recapitalizations with respect to the Common Stock occurring after
             the date of this Agreement) multiplied by the current market price
             per share of the Common Stock. If neither the Common Stock nor the
             Preferred Stock is publicly held or so listed or traded, "current
             market price" per share of the Preferred Stock shall mean the fair
             value per share as determined in good faith by the Board, whose
             determination shall be described in a statement filed with the
             Rights Agent and shall be conclusive for all purposes. For all
             purposes of this Agreement, the "current market price" of one
             one-thousandth of a share of Preferred Stock shall be equal to the
             "current market price" of one share of Preferred Stock divided by
             1000.

             (e) Anything herein to the contrary notwithstanding, no adjustment
in the Purchase Price shall be required unless such adjustment would require an
increase or decrease of at least one percent (1%) in the Purchase Price;
PROVIDED, HOWEVER, that any adjustments which

                                       18
<PAGE>

by reason of this Section 11(e) are not required to be made shall be carried
forward and taken into account in any subsequent adjustment. All calculations
under this Section 11 shall be made to the nearest cent or to the nearest
ten-millionth of a share of Preferred Stock, or hundred-thousandth of a
share of Common Stock or other security, as the case may be. Notwithstanding the
first sentence of this Section 11(e), any adjustment required by this Section 11
shall be made no later than the earlier of (i) three years from the date of the
transaction which mandates such adjustment, or (ii) the Expiration Date.

             (f) If as a result of an adjustment made pursuant to Section
11(a)(ii) or Section 13(a) hereof, the holder of any Right thereafter exercised
shall become entitled to receive any securities other than Preferred Stock,
thereafter the number of such other securities so receivable upon exercise of
any Right and the Purchase Price thereof shall be subject to adjustment from
time to time in a manner and on terms as nearly equivalent as practicable to the
provisions with respect to the Preferred Stock contained in Sections 11(a), (b),
(c), (e), (g), (h), (i), (j), (k) and (m), and the provisions of Sections 7, 9,
10, 13 and 14 hereof with respect to the Preferred Stock shall apply on like
terms to any such other securities; PROVIDED, HOWEVER, that the Company shall
not be liable for its inability to reserve and keep available for issuance upon
exercise of the Rights pursuant to Section 11(a)(ii) a number of shares of
Common Stock greater than the number then authorized by the Company's
Certificate of Incorporation but not outstanding or reserved for other purposes.

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

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

             (i) The Company may elect on or after the date of any adjustment of
the Purchase Price to adjust the number of Rights, in lieu of any adjustment in
the number of one one-thousandths of a share of Preferred Stock purchasable upon
the exercise of a Right. Each of the Rights outstanding after the adjustment in
the number of Rights shall be exercisable for the number of one one-thousandths
of a share of Preferred Stock for which a Right was exercisable immediately
prior to such adjustment. Each Right held of record prior to such adjustment of
the number of Rights shall become that number of Rights (calculated to the
nearest one-hundred- thousandth) obtained by dividing the Purchase Price in
effect immediately prior to adjustment of the Purchase Price by the Purchase
Price in effect immediately after adjustment of the Purchase Price. The Company
shall make a public announcement of its election to adjust the number of

                                       19
<PAGE>

Rights, indicating the record date for the adjustment, and, if known at the
time, the amount of the adjustment to be made. This record date may be the date
on which the Purchase Price is adjusted or any day thereafter, but, if the
Rights Certificates have been issued, shall be at least ten (10) days later than
the date of the public announcement. If Rights Certificates have been issued,
upon each adjustment of the number of Rights pursuant to this Section 11(i),
the Company shall, as promptly as practicable, cause to be distributed to
holders of record of Rights Certificates on such record date Rights Certificates
evidencing, subject to Section 14 hereof, the additional Rights to which such
holders shall be entitled as a result of such adjustment, or, at the option of
the Company, shall cause to be distributed to such holders of record in
substitution and replacement for the Rights Certificates held by such holders
prior to the date of adjustment, and upon surrender thereof, if required by the
Company, new Rights Certificates evidencing all the Rights to which such holders
shall be entitled after such adjustment. Rights Certificates so to be
distributed shall be issued, executed and countersigned in the manner provided
for herein (and may bear, at the option of the Company, the adjusted Purchase
Price) and shall be registered in the names of the holders of record of Rights
Certificates on the record date specified in the public announcement.

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

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

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

             (m) Anything in this Section 11 to the contrary notwithstanding,
the Company shall be entitled to make such reductions in the Purchase Price, in
addition to those adjustments expressly required by this Section 11, as and to
the extent that in their good faith judgment the Board shall determine to be
advisable in order that any (i) consolidation or subdivision of the Preferred
Stock, (ii) issuance wholly for cash of any shares of Preferred Stock at less
than the

                                       20
<PAGE>

current market price, (iii) issuance wholly for cash of shares of Preferred
Stock or securities which by their terms are convertible into or exchangeable
for shares of Preferred Stock, (iv) stock dividends or (v) issuance of rights,
options or warrants referred to in this Section 11, hereafter made by the
Company to holders of its Preferred Stock shall not be taxable to such
stockholders.

             (n) The Company covenants and agrees that it shall not, at any time
after the Distribution Date, (i) consolidate with any other Person (other than a
Subsidiary of the Company in a transaction that complies with Section 11(o)
hereof), (ii) merge with or into any other Person (other than a Subsidiary of
the Company in a transaction which complies with Section 11(o) hereof), or (iii)
sell or transfer (or permit any Subsidiary to sell or transfer), in one
transaction, or a series of related transactions, assets or earning power
aggregating more than 50% of the assets or earning power of the Company and its
Subsidiaries (taken as a whole) to any other Person or Persons (other than the
Company and/or any of its Subsidiaries in one or more transactions each of which
complies with Section 11(o) hereof), if (x) at the time of or immediately after
such consolidation, merger or sale there are any charter or bylaw provisions or
any rights, warrants or other instruments or securities outstanding or
agreements in effect that would substantially diminish or otherwise eliminate
the benefits intended to be afforded by the Rights or (y) prior to,
simultaneously with or immediately after such consolidation, merger or sale, the
stockholders of the Person who constitutes, or would constitute, the "Principal
Party" for purposes of Section 13(a) hereof shall have received a distribution
of Rights previously owned by such Person or any of its Affiliates or
Associates. The Company shall not consummate any consolidation, merger, sale or
transfer described in clause (i), (ii) or (iii) of the prior sentence unless
prior thereto the Company and such other Person shall have executed and
delivered to the Rights Agent a supplemental agreement evidencing compliance
with this Section 11(n).

             (o) The Company covenants and agrees that, after the Distribution
Date, it will not, except as permitted by Section 23, Section 24 or Section 27
hereof, take (or permit any Subsidiary to take) any action if at the time such
action is taken it is reasonably foreseeable that such action will diminish
substantially or otherwise eliminate the benefits intended to be afforded by the
Rights.

             (p) Anything in this Agreement to the contrary notwithstanding, in
the event that the Company shall at any time after the Record Date and prior to
the Distribution Date (i) declare or pay any dividend on the outstanding shares
of Common Stock payable in shares of Common Stock, (ii) subdivide the
outstanding shares of Common Stock, or (iii) combine the outstanding shares of
Common Stock into a smaller number of shares, the number of Rights associated
with each share of Common Stock then outstanding, or issued or delivered
thereafter but prior to the Distribution Date, shall be proportionately adjusted
so that the number of Rights thereafter associated with each share of Common
Stock following any such event shall equal the result obtained by multiplying
the number of Rights associated with each share of Common Stock immediately
prior to such event by a fraction, the numerator of which shall be the number of
shares of Common Stock outstanding immediately prior to the occurrence of such
event and the denominator of which shall be the number of shares of Common Stock
outstanding immediately following the occurrence of such event.

                                       21
<PAGE>

     Section 12. CERTIFICATE OF ADJUSTED PURCHASE PRICE OR NUMBER OF SHARES.
Whenever an adjustment is made as provided in Section 11 or Section 13 hereof,
the Company shall promptly (a) prepare a certificate setting forth such
adjustment and a brief statement of the facts accounting for such adjustment,
(b) file with the Rights Agent, and with each transfer agent for the Preferred
Stock and the Common Stock, a copy of such certificate, and (c) mail a brief
summary thereof to each holder of a Rights Certificate (or, if prior to the
Distribution Date, to each holder of a certificate representing shares of Common
Stock) in accordance with Section 26 hereof. The Rights Agent shall be fully
protected in relying on any such certificate and on any adjustment therein
contained and shall not be deemed to have knowledge of any adjustment unless and
until it shall have received such certificate.

     Section 13. CONSOLIDATION, MERGER OR SALE OR TRANSFER OF ASSETS OR EARNING
POWER.

             (a) In the event that, at any time after a Person has become an
Acquiring Person, (x) the Company shall consolidate with, or merge with and
into, any other Person (other than a Subsidiary of the Company in a transaction
that complies with Section 11(o) hereof), and the Company shall not be the
continuing or surviving corporation of such consolidation or merger, (y) any
Person (other than a Subsidiary of the Company in a transaction that complies
with Section 11(o) hereof) shall consolidate with, or merge with or into, the
Company, and the Company shall be the continuing or surviving corporation of
such consolidation or merger and, in connection with such consolidation or
merger, all or part of the outstanding shares of Common Stock shall be changed
into or exchanged for stock or other securities of any other Person or cash or
any other property, or (z) the Company shall sell or otherwise transfer (or one
or more of its Subsidiaries shall sell or otherwise transfer), in one
transaction or a series of related transactions, assets or earning power
aggregating more than 50% of the assets or earning power of the Company and its
Subsidiaries (taken as a whole) to any Person or Persons (other than the Company
or any Subsidiary of the Company in one or more transactions each of which
complies with Section 11(o) hereof), then, and in each such case and except as
contemplated by Section 13(d) hereof, proper provision shall be made so that:
(i) each holder of a Right, except as provided in Section 7(e) hereof, shall
thereafter have the right to receive, upon the exercise thereof at the then
current Purchase Price in accordance with the terms of this Agreement, such
number of validly authorized and issued, fully paid, non-assessable and freely
tradeable shares of Common Stock of the Principal Party (as such term is
hereinafter defined), which shall not be subject to any liens, encumbrances,
rights of first refusal or other adverse claims, as shall be equal to the result
obtained by (1) multiplying the then current Purchase Price by the number of one
one-thousandths of a share of Preferred Stock for which a Right is exercisable
immediately prior to the first occurrence of a Section 13 Event (or, if a
Section 11(a)(ii) Event has occurred prior to the first occurrence of a Section
13 Event, multiplying the number of such one one-thousandths of a share for
which a Right was exercisable immediately prior to the first occurrence of a
Section 11(a)(ii) Event by the Purchase Price in effect immediately prior to
such first occurrence), and (2) dividing that product (which, following the
first occurrence of a Section 13 Event, shall be referred to as the "Purchase
Price" for each Right and for all purposes of this Agreement) by 50% of the
current market price (determined pursuant to Section 11(d)(i) hereof) per share
of the Common Stock of such Principal Party on the date of consummation of such
Section 13 Event; (ii) such Principal Party shall thereafter be liable for, and
shall assume, by virtue of such Section 13 Event, all the obligations and duties
of the Company pursuant to this Agreement; (iii) the term "Company" shall
thereafter be deemed to refer to such Principal Party,

                                       22
<PAGE>

it being specifically intended that, subject to clause (v) below, the provisions
of Section 11 hereof shall apply only to such Principal Party following the
first occurrence of a Section 13 Event; (iv) such Principal Party shall take
such steps (including, but not limited to, the reservation of a sufficient
number of shares of its Common Stock) in connection with the consummation of any
such transaction as may be necessary to assure that the provisions hereof shall
thereafter be applicable, as nearly as reasonably may be, in relation to its
shares of Common Stock thereafter deliverable upon the exercise of the Rights;
and (v) the provisions of Section 11(a)(ii) hereof shall be of no effect
following the first occurrence of any Section 13 Event.

             (b) "Principal Party" shall mean

                 (i) in the case of any transaction described in clause (x) or
             (y) of the first sentence of Section 13(a), the Person that is the
             issuer of any securities into which shares of Common Stock of the
             Company are converted in such merger or consolidation, and if no
             securities are so issued, the Person that is the other party to
             such merger or consolidation; and

                 (ii) in the case of any transaction described in clause (z) of
             the first sentence of Section 13(a), the Person that is the party
             receiving the greatest portion of the assets or earning power
             transferred pursuant to such transaction or transactions;

PROVIDED, HOWEVER, that in any such case, (1) if the Common Stock of such Person
is not at such time and has not been continuously over the preceding twelve (12)
month period registered under Section 12 of the Exchange Act, and such Person is
a direct or indirect Subsidiary of another Person the Common Stock of which is
and has been so registered, "Principal Party" shall refer to such other Person;
(2) in case such Person is a Subsidiary, directly or indirectly, of more than
one Person, the Common Stocks of two or more of which are and have been so
registered, "Principal Party" shall refer to whichever of such Persons is the
issuer of the Common Stock having the greatest aggregate market value; and (3)
in case such Person is owned, directly or indirectly, by a joint venture formed
by two or more Persons that are not owned, directly or indirectly, by the same
Person, the rules set forth in (1) and (2) above shall apply to each of the
chains of ownership having an interest in such joint venture as if such party
were a "Subsidiary" of both or all of such joint ventures and the Principal
Parties in each such chain shall bear the obligations set forth in this Section
13 in the same ratio as their direct or indirect interests in such Person bear
to the total of such interests.

             (c) The Company shall not consummate any such consolidation,
merger, sale or transfer unless the Principal Party shall have a sufficient
number of authorized shares of its Common Stock which have not been issued or
reserved for issuance to permit the exercise in full of the Rights in accordance
with this Section 13 and unless prior thereto the Company and such Principal
Party shall have executed and delivered to the Rights Agent a supplemental
agreement providing for the terms set forth in paragraphs (a) and (b) of this
Section 13 and further providing that, as soon as practicable after the date of
any consolidation, merger or sale of assets mentioned in paragraph (a) of this
Section 13, the Principal Party will

                                       23
<PAGE>

                 (i) prepare and file a registration statement under the Act,
             with respect to the Rights and the securities purchasable upon
             exercise of the Rights on an appropriate form, and will use its
             best efforts to cause such registration statement to (A) become
             effective as soon as practicable after such filing and (B) remain
             effective (with a prospectus at all times meeting the requirements
             of the Act) until the Expiration Date;

                 (ii) use its best efforts to qualify or register the Rights and
             the securities purchasable upon exercise of the Rights under the
             blue sky laws of such jurisdictions as may be necessary or
             appropriate; and

                 (iii) deliver to holders of the Rights historical financial
             statements for the Principal Party and each of its Affiliates that
             comply in all respects with the requirements for registration on
             Form 10 under the Exchange Act.

The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations or sales or other transfers. In the event that a Section 13 Event
shall occur at the same time as, or at any time after, the occurrence of a
Section 11(a)(ii) Event, the Rights which have not theretofore been exercised
shall thereafter become exercisable in the manner described in Section 13(a).

             (d) Notwithstanding anything in this Agreement to the contrary,
Section 13 shall not be applicable to a transaction described in subparagraphs
(x) and (y) of Section 13(a) if (i) such transaction is consummated with a
Person or Persons (or a wholly owned subsidiary of any such Person or Persons)
who acquired shares of Common Stock pursuant to a Permitted Offer, (ii) the
price per share of Common Stock paid in such transaction is not less than the
price per share of Common Stock paid to all holders of shares of Common Stock
whose shares were purchased pursuant to such Permitted Offer, and (iii) the form
of consideration paid in such transaction is the same as the form of
consideration paid pursuant to such Permitted Offer. Upon consummation of any
such transaction contemplated by this Section 13(d), all Rights hereunder shall
expire.

     Section 14. FRACTIONAL RIGHTS AND FRACTIONAL SHARES

             (a) The Company shall not be required to issue fractions of Rights,
except prior to the Distribution Date as provided in Section 11(i) or (p)
hereof, or to distribute Rights Certificates that evidence fractional Rights. In
lieu of such fractional Rights, there shall be paid to the registered holders of
the Rights Certificates with regard to which such fractional Rights would
otherwise be issuable, an amount in cash equal to the same fraction of the
current market value of a whole Right. For purposes of this Section 14(a), the
current market value of a whole Right shall be the closing price of the Rights
for the Trading Day immediately prior to the date on which such fractional
Rights would have been otherwise issuable. The closing price of the Rights for
any day shall be the last sale price, regular way, or, in case no such sale
takes place on such day, the average of the closing bid and asked prices,
regular way, in either case as reported in the principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the principal national securities exchange on which the Rights are
listed or admitted to trading, or if the Rights are not listed or admitted to
trading on any national securities exchange, the last quoted price or, if not so
quoted, the average of the high bid and the low asked

                                       24
<PAGE>

prices in the over-the-counter market, as reported by Nasdaq or such other
system then in use or, if on any such date the Rights are not quoted by any such
organization, the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board.
All references in this Section to closing prices, last quoted prices or other
stock prices means prices during regular trading hours, without giving affect to
any after-hours or extended hours trading. If on any such date no such market
maker is making a market in the Rights, the fair value of the Rights on such
date as determined in good faith by the Board shall be used, which determination
shall be described in a statement filed with the Rights Agent and shall be
conclusive for all purposes.

             (b) The Company shall not be required to issue fractions of shares
of Preferred Stock (other than fractions which are integral multiples of one
one-thousandth of a share of Preferred Stock) upon exercise of the Rights or to
distribute certificates that evidence fractional shares of Preferred Stock
(other than fractions which are integral multiples of one one-thousandth of a
share of Preferred Stock). Fractional shares of Preferred Stock in integral
multiples of one one-thousandth of a share of Preferred Stock may, at the
election of the Company, be evidenced by depositary receipts; provided, however,
that holders of such depositary receipts shall have all of the designations and
the powers, preferences and rights, and the qualifications, limitations and
restrictions to which they are entitled as beneficial owners of the shares of
Preferred Stock represented by such depositary receipts. In lieu of fractional
shares of Preferred Stock (other than fractions which are integral multiples of
one one-thousandth of a share of Preferred Stock), the Company shall pay to the
registered holders of Rights Certificates at the time such Rights are exercised
as herein provided an amount in cash equal to the same fraction of the current
market value of one one-thousandth of a share of Preferred Stock. For purposes
of this Section 14(b), the current market value of one one-thousandth of a share
of Preferred Stock shall be one one-thousandth of the closing price of a share
of Preferred Stock (as determined pursuant to Section 11(d)(ii) hereof) for the
Trading Day immediately prior to the date of such exercise.

             (c) Following the occurrence of a Triggering Event, the Company
shall not be required to issue fractions of shares of Common Stock upon exercise
of the Rights or to distribute certificates which evidence fractional shares of
Common Stock. In lieu of fractional shares of Common Stock, the Company shall
pay to the registered holders of Rights Certificates at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current market price of one (1) share of Common Stock (as determined pursuant to
Section 11(d)(i) hereof) for the Trading Day immediately prior to the date of
such exercise.

             (d) The holder of a Right by the acceptance of the Right expressly
waives his right to receive any fractional Rights or any fractional shares upon
exercise of a Right, except as permitted by this Section 14.

     Section 15. RIGHTS OF ACTION. All rights of action in respect of this
Agreement, except the rights of action expressly given to the Rights Agent in
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Stock); and any registered holder of any Rights Certificate (or, prior to
the Distribution Date, of the Common Stock), without the consent of the Rights
Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common

                                       25
<PAGE>

Stock), may, in his own behalf and for his own benefit, enforce, and may
institute and maintain any suit, action or proceeding against the Company to
enforce, or otherwise act in respect of, his right to exercise the Rights
evidenced by such Rights Certificate in the manner provided in such Rights
Certificate and in this Agreement. Without limiting the foregoing or any
remedies available to the holders of Rights, it is specifically acknowledged
that the holders of Rights would not have an adequate remedy at law for any
breach of this Agreement and shall be entitled to specific performance of the
obligations hereunder and injunctive relief against actual or threatened
violations of the obligations hereunder of any Person subject to this Agreement.

     Section 16. AGREEMENT OF RIGHTS HOLDERS. Every holder of a Right by
accepting the same consents and agrees with the Company and the Rights Agent and
with every other holder of a Right that:

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

             (b) after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the office of the Rights Agent designated for such purposes, duly endorsed or
accompanied by a proper instrument of transfer and with the appropriate forms
and certificates duly completed and fully executed;

             (c) subject to Section 6(a) and Section 7(f) hereof, the Company
and the Rights Agent may deem and treat the person in whose name a Rights
Certificate (or, prior to the Distribution Date, the associated Common Stock
certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (notwithstanding any notations of ownership or writing on the
Rights Certificates or the associated Common Stock certificate made by anyone
other than the Company or the Rights Agent) for all purposes whatsoever, and
neither the Company nor the Rights Agent, subject to the penultimate sentence of
Section 7(e) hereof, shall be required to be affected by any notice to the
contrary; and

             (d) notwithstanding anything in this Agreement to the contrary,
neither the Company nor the Rights Agent shall have any liability to any holder
of a Right or other Person as a result of its inability to perform any of its
obligations under this Agreement by reason of any preliminary or permanent
injunction or other order, decree or ruling issued by a court of competent
jurisdiction or by a governmental, regulatory or administrative agency or
commission, or any statute, rule, regulation or executive order promulgated or
enacted by any governmental authority, prohibiting or otherwise restraining
performance of such obligation; PROVIDED, HOWEVER, the Company must use its best
efforts to prevent the issuance of any such order, decree or ruling and to have
any such order, decree or ruling lifted or otherwise overturned as soon as
possible.

     Section 17. RIGHTS CERTIFICATE HOLDER NOT DEEMED A STOCKHOLDER. No holder,
as such, of any Rights Certificate shall be entitled to vote, receive dividends
or be deemed for any purpose the holder of the number of one one-thousandths of
a share of Preferred Stock or any other securities of the Company which may at
any time be issuable on the exercise of the Rights represented thereby, nor
shall anything contained herein or in any Rights Certificate be construed to
confer upon the holder of any Rights Certificate, as such, any of the rights of
a stockholder of

                                       26
<PAGE>

the Company or any right to vote for the election of directors or upon any
matter submitted to stockholders at any meeting thereof, or to give or withhold
consent to any corporate action, or to receive notice of meetings or other
actions affecting stockholders (except as provided in Section 25 hereof), or to
receive dividends or subscription rights, or otherwise, until the Right or
Rights evidenced by such Rights Certificate shall have been exercised in
accordance with the provisions hereof.

     Section 18. CONCERNING THE RIGHTS AGENT.

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

             (b) The Rights Agent shall be protected and shall incur no
liability for or in respect of any action taken, suffered or omitted by it in
connection with its administration of this Agreement in reliance upon any Rights
Certificate or certificate for Common Stock or for other securities of the
Company, instrument of assignment or transfer, power of attorney, endorsement,
affidavit, letter, notice, direction, consent, certificate, statement, or other
paper or document believed by it to be genuine and to be signed, executed and,
where necessary, verified or acknowledged, by the proper Person or Persons, or
otherwise upon the advice of counsel as set forth in Section 20 hereof.

     Section 19. MERGER OR CONSOLIDATION OR CHANGE OF NAME OF RIGHTS AGENT.

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

                                       27
<PAGE>

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

     Section 20. DUTIES OF RIGHTS AGENT. The Rights Agent undertakes the duties
and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Rights Certificates,
by their acceptance thereof, shall be bound:

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

             (b) Whenever in the performance of its duties under this Agreement
the Rights Agent shall deem it necessary or desirable that any fact or matter
(including, without limitation, the identity of any Acquiring Person and the
determination of "current market price") be proved or established by the Company
prior to taking or suffering any action hereunder, such fact or matter (unless
other evidence in respect thereof be herein specifically prescribed) may be
deemed to be conclusively proved and established by a certificate signed by the
Chairman of the Board, the President, any Vice President, the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Company and
delivered to the Rights Agent; and such certificate shall be full authorization
to the Rights Agent for any action taken or suffered in good faith by it under
the provisions of this Agreement in reliance upon such certificate.

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

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

             (e) The Rights Agent shall not be under any responsibility in
respect of the validity of this Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Rights Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any adjustment required under the provisions of
Section 11, Section 13 or Section 24 hereof or responsible for the manner,
method or amount of any such adjustment or the ascertaining of the existence of
facts that would require any such adjustment (except with respect to the
exercise of Rights evidenced by Rights Certificates after receipt of a
certificate describing any such adjustment, delivered pursuant to Section 12);
nor shall it by any act hereunder be deemed to make any representation or
warranty as to the authorization or reservation of any

                                       28
<PAGE>

shares of Common Stock or Preferred Stock to be issued pursuant to this
Agreement or any Rights Certificate or as to whether any shares of Common
Stock or Preferred Stock will, when so issued, be validly authorized and issued,
fully paid and nonassessable.

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

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

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

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

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

                                       29
<PAGE>

             (k) If, with respect to any Rights Certificate surrendered to the
Rights Agent for exercise or transfer, the certificate attached to the form of
assignment or form of election to purchase, as the case may be, has not been
completed, the Company and the Rights Agent will deem the beneficial owner of
the rights evidenced by such Rights Certificate to be an Acquiring Person or an
Affiliate or Associate thereof and such assignment or election to purchase will
not be honored.

     Section 21. CHANGE OF RIGHTS AGENT. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company, and to each
transfer agent of the Common Stock and Preferred Stock, by registered or
certified mail, and to the holders of the Rights Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
thirty (30) days' notice in writing, mailed to the Rights Agent or successor
Rights Agent, as the case may be, and to each transfer agent of the Common Stock
and Preferred Stock, by registered or certified mail, and to the holders of the
Rights Certificates by first-class mail. If the Rights Agent shall resign or be
removed or shall otherwise become incapable of acting, the Company shall appoint
a successor to the Rights Agent. If the Company shall fail to make such
appointment within a period of thirty (30) days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit his Rights Certificate
for inspection by the Company), then any registered holder of any Rights
Certificate may apply to any court of competent jurisdiction for the appointment
of a new Rights Agent. Any successor Rights Agent, whether appointed by the
Company or by such a court, shall be (a) a corporation organized and doing
business under the laws of the United States (or of any state of the United
States) in good standing, which is authorized under such laws to exercise
corporate trust or stock transfer powers and is subject to supervision or
examination by federal or state authority and which has at the time of its
appointment as Rights Agent a combined capital and surplus of at least
$50,000,000 or (b) an affiliate of a corporation described in clause (a) of this
sentence. After appointment, the successor Rights Agent shall be vested with the
same powers, rights, duties and responsibilities as if it had been originally
named as Rights Agent without further act or deed; but the predecessor Rights
Agent shall deliver and transfer to the successor Rights Agent any property at
the time held by it hereunder, and execute and deliver any further assurance,
conveyance, act or deed necessary for the purpose. Not later than the effective
date of any such appointment, the Company shall file notice thereof in writing
with the predecessor Rights Agent and each transfer agent of the Common Stock
and the Preferred Stock, and mail a notice thereof in writing to the registered
holders of the Rights Certificates. Failure to give any notice provided for in
this Section 21, however, or any defect therein, shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the appointment
of the successor Rights Agent, as the case may be.

     Section 22. ISSUANCE OF NEW RIGHTS CERTIFICATES. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Rights Certificates evidencing Rights in such form
as may be approved by the Board to reflect any adjustment or change in the
Purchase Price and the number or kind or class of shares or other securities or
property purchasable under the Rights Certificates made in accordance with the
provisions of this Agreement.

                                       30
<PAGE>

     Section 23. REDEMPTION.

             (a) The Board may, at its option, at any time prior to the earlier
of (i) the close of business on the tenth Business Day (or such later date as
may be determined by the Board pursuant to clause (i) of the first sentence of
Section 3(a) with respect to the Distribution Date) following the Stock
Acquisition Date (or, if the Stock Acquisition Date shall have occurred prior to
the Record Date, the close of business on the tenth Business Day following the
Record Date) and (ii) the Final Expiration Date, redeem all but not less than
all the then outstanding Rights at a redemption price of $.001 per Right, as
such amount may be appropriately adjusted to reflect any stock split, stock
dividend or similar transaction occurring after the date hereof (such redemption
price being hereinafter referred to as the "Redemption Price"). The redemption
of the Rights by the Board may be made effective at such time, on such basis and
with such conditions as the Board in its sole discretion may establish. The
Company may, at its option, pay the Redemption Price in cash, shares of Common
Stock (based on the "current market price," as defined in Section 11(d)(i)
hereof, of the Common Stock at the time of redemption) or any other form of
consideration, or any combination of any of the foregoing, deemed appropriate by
the Board. Notwithstanding anything contained in this Agreement to the contrary,
the Rights shall not be exercisable after the first occurrence of a Section
11(a)(ii) Event until such time as the Company's right of redemption hereunder
has expired.

             (b) Immediately upon the action of the Board ordering the
redemption of the Rights, evidence of which shall have been filed with the
Rights Agent and without any further action and without any notice, the right to
exercise the Rights shall terminate and the only right thereafter of the holders
of Rights shall be to receive the Redemption Price for each Right so held.
Promptly after the action of the Board ordering the redemption of the Rights,
the Company shall give notice of such redemption to the Rights Agent and the
holders of the then outstanding Rights by mailing such notice to all such
holders at each holder's last address as it appears upon the registry books of
the Rights Agent or, prior to the Distribution Date, on the registry books of
the Transfer Agent for the Common Stock. Any notice which is mailed in the
manner herein provided shall be deemed given, whether or not the holder receives
the notice. Each such notice of redemption will state the method by which the
payment of the Redemption Price will be made.

             (c) In the event of a redemption of the Rights in accordance with
this Agreement, the Company may, at its option, discharge all of its obligations
with respect to the Rights by (i) issuing a press release announcing the manner
of redemption of the Rights in accordance with this Agreement and (ii) mailing
payment of the Redemption Price to the registered holders of the Rights at their
last addresses as they appear on the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry books of the Transfer Agent of
the Common Shares, and upon such action, all outstanding Rights and Right
Certificates shall be null and void without any further action by the Company.

     Section 24. EXCHANGE.

             (a) The Board may, at its option, at any time after a Section
11(a)(ii) Event, exchange all or part of the then outstanding and exercisable
Rights (which (i) shall not include Rights that have become void pursuant to the
provisions of Section 7(e) hereof, and (ii) shall

                                       31
<PAGE>

include, without limitation, any Rights issued after the Distribution Date)
for shares of Common Stock at an exchange ratio of one share of Common Stock per
Right, appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "Exchange Ratio").  Notwithstanding the
foregoing, the Board shall not be empowered to effect such exchange at any time
after any Person (other than the Company, any Subsidiary of the Company, any
employee benefit plan of the Company or any such Subsidiary, or any entity
holding Common Stock for or pursuant to the terms of any such plan), together
with all Affiliates and Associates of such Person, becomes the Beneficial Owner
of 50% or more of the shares of Common Stock then outstanding.

             (b) Immediately upon the action of the Board ordering the exchange
of any Rights pursuant to subsection (a) of this Section 24, evidence of which
shall have been filed with the Rights Agent, and without any further action and
without any notice, the right to exercise such Rights shall terminate and the
only right thereafter of a holder of such Rights shall be to receive that number
of shares of Common Stock equal to the number of such Rights held by such holder
multiplied by the Exchange Ratio. The Company shall promptly give public notice
of any such exchange; PROVIDED, HOWEVER, that the failure to give, or any defect
in, such notice shall not affect the validity of such exchange. The Company
promptly shall mail a notice of any such exchange to all of the holders of such
Rights at their last addresses as they appear upon the registry books of the
Rights Agent. Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice. Each such notice of
exchange shall state the method by which the exchange of shares of Common Stock
for Rights will be effected and, in the event of any partial exchange, the
number of Rights which will be exchanged. Any partial exchange shall be effected
pro rata based on the number of Rights (other than Rights which have become void
pursuant to the provisions of Section 7(e) hereof) held by each holder of
Rights.

             (c) In any exchange pursuant to this Section 24, the Company, at
its option, may substitute Preferred Stock (or equivalent preferred stock, as
such term is defined in Section 11(b) hereof) for shares of Common Stock
exchangeable for Rights, at the initial rate of one one-thousandth of a share of
Preferred Stock (or equivalent preferred stock) for each share of Common Stock,
as appropriately adjusted to reflect adjustments in the voting rights of the
Preferred Stock pursuant to Section 3(A) of the Certificate of Designations
attached hereto as EXHIBIT A, so that the fraction of a share of Preferred Stock
(or equivalent preferred stock) delivered in lieu of each share of Common Stock
shall have the same voting rights as one share of Common Stock.

             (d) In the event that there shall not be sufficient shares of
Common Stock or Preferred Stock issued but not outstanding or authorized but
unissued to permit any exchange of Rights as contemplated in accordance with
this Section 24, the Company shall take all such action as may be necessary to
authorize additional shares of Common Stock or Preferred Stock for issuance upon
exchange of the Rights.

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

                                       32
<PAGE>

otherwise be issuable, an amount in cash equal to the same fraction of the
current market value of a whole share of Common Stock. For the purposes of this
subsection (e), the current market value of a whole share of Common Stock shall
be the closing price per share of Common Stock (as determined pursuant to the
second sentence of Section 11(d)(i) hereof) for the Trading Day immediately
prior to the date of exchange pursuant to this Section 24.

     Section 25. NOTICE OF CERTAIN EVENTS.

             (a) In case the Company shall propose, at any time after the
Distribution Date, (i) to pay any dividend payable in stock of any class to the
holders of Preferred Stock or to make any other distribution to the holders of
Preferred Stock (other than a regular quarterly cash dividend out of earnings or
retained earnings of the Company), or (ii) to offer to the holders of Preferred
Stock rights or warrants to subscribe for or to purchase any additional shares
of Preferred Stock or shares of stock of any class or any other securities,
rights or options, or (iii) to effect any reclassification of its Preferred
Stock (other than a reclassification involving only the subdivision of
outstanding shares of Preferred Stock), or (iv) to effect any consolidation or
merger into or with any other Person (other than a Subsidiary of the Company in
a transaction which complies with Section 11(o) hereof), or to effect any sale
or other transfer (or to permit one or more of its Subsidiaries to effect any
sale or other transfer), in one transaction or a series of related transactions,
of more than 50% of the assets or earning power of the Company and its
Subsidiaries (taken as a whole) to any other Person or Persons (other than the
Company and/or any of its Subsidiaries in one or more transactions each of which
complies with Section 11(o) hereof), or (v) to effect the liquidation,
dissolution or winding up of the Company, then, in each such case, the Company
shall give to each holder of a Rights Certificate, to the extent feasible and in
accordance with Section 26 hereof, a notice of such proposed action, which shall
specify the record date for the purposes of such stock dividend, distribution of
rights or warrants, or the date on which such reclassification, consolidation,
merger, sale, transfer, liquidation, dissolution, or winding up is to take place
and the date of participation therein by the holders of the shares of Preferred
Stock, if any such date is to be fixed, and such notice shall be so given in the
case of any action covered by clause (i) or (ii) above at least twenty (20) days
prior to the record date for determining holders of the shares of Preferred
Stock for purposes of such action, and in the case of any such other action, at
least twenty (20) days prior to the date of the taking of such proposed action
or the date of participation therein by the holders of the shares of Preferred
Stock, whichever shall be the earlier.

             (b) In case a Section 11(a)(ii) Event shall occur, then, in any
such case, (i) the Company shall as soon as practicable thereafter give to each
holder of a Rights Certificate, to the extent feasible and in accordance with
Section 26 hereof, a notice of the occurrence of such event, which shall specify
the event and the consequences of the event to holders of Rights under Section
11(a)(ii) hereof, and (ii) all references in the preceding paragraph to
Preferred Stock shall be deemed thereafter to refer also to Common Stock and/or,
if appropriate, other securities; provided that the failure to give such notice
shall not affect the validity of such consent.

     Section 26. NOTICES. Notices or demands authorized by this Agreement to be
given or made by the Rights Agent or by the holder of any Rights Certificate to
or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

                                       33
<PAGE>

                             Millennium Pharmaceuticals, Inc.
                             75 Sidney Street
                             Cambridge, MA 02139
                             Attention: Chief Executive Officer

                             with a copy to:

                             Hale and Dorr LLP
                             60 State Street
                             Boston, MA 02109
                             Attention: David E. Redlick, Esq.

Subject to the provisions of Section 21, any notice or demand authorized by this
Agreement to be given or made by the Company or by the holder of any Rights
Certificate to or on the Rights Agent shall be sufficiently given or made if
sent by first-class mail, postage prepaid, addressed (until another address is
filed in writing with the Company) as follows:

                              State Street Bank and Trust Company
                              c/o EquiServe Limited Partnership
                              150 Royall Street
                              Canton, MA  02021
                              Attention:  Client Administration

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate (or, if
prior to the Distribution Date, to the holder of certificates representing
shares of Common Stock) shall be sufficiently given or made if sent by
first-class mail, postage prepaid, addressed to such holder at the address of
such holder as shown on the registry books of the Company.

     Section 27. SUPPLEMENTS AND AMENDMENTS. Except as provided in the
penultimate sentence of this Section 27, for so long as the Rights are then
redeemable, the Company may, in its sole and absolute discretion, and the Rights
Agent shall, if the Company so directs, supplement or amend any provision of
this Agreement in any respect without the approval of any holders of the Rights.
At any time when the Rights are no longer redeemable, except as provided in the
penultimate sentence of this Section 27, the Company may, by approval of at
least 75% of the members of the Board, and the Rights Agent shall, if the
Company so directs, supplement or amend this Agreement without the approval of
any holders of Rights in order (i) to cure any ambiguity or (ii) to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein, provided that no such supplement or amendment
shall adversely affect the interests of the holders of Rights as such (other
than an Acquiring Person or an Affiliate or Associate of an Acquiring Person).
Upon the delivery of a certificate from an appropriate officer of the Company
which states that the proposed supplement or amendment is in compliance with the
terms of this Section 27, the Rights Agent shall execute such supplement or
amendment. Notwithstanding anything contained in this Agreement to the contrary,
no supplement or amendment shall be made which changes the Redemption Price.
Prior to the Distribution Date, the interests of the holders of Rights shall be
deemed coincident with the interests of the holders of Common Stock.

                                       34
<PAGE>

     Section 28. SUCCESSORS. All the covenants and provisions of this Agreement
by or for the benefit of the Company or the Rights Agent shall bind and inure to
the benefit of their respective successors and assigns hereunder.

     Section 29. ACTIONS BY THE BOARD, ETC. The Board shall have the exclusive
power and authority to administer this Agreement and to exercise all rights and
powers specifically granted to the Board or to the Company, or as may be
necessary or advisable in the administration of this Agreement, including,
without limitation, the right and power to (i) interpret the provisions of this
Agreement, and (ii) make all determinations deemed necessary or advisable for
the administration of this Agreement (including a determination to redeem or not
redeem the Rights or to amend this Agreement). All such actions, calculations,
interpretations and determinations (including, for purposes of clause (y) below,
all omissions with respect to the foregoing) which are done or made by the Board
in good faith, shall (x) be final, conclusive and binding on the Company, the
Rights Agent, the holders of the Rights and all other parties, and (y) not
subject the Board to any liability to the holders of the Rights.

     Section 30. BENEFITS OF THIS AGREEMENT. Nothing in this Agreement shall be
construed to give to any Person other than the Company, the Rights Agent and the
registered holders of the Rights Certificates (and, prior to the Distribution
Date, registered holders of the Common Stock) any legal or equitable right,
remedy or claim under this Agreement; but this Agreement shall be for the sole
and exclusive benefit of the Company, the Rights Agent and the registered
holders of the Rights Certificates (and, prior to the Distribution Date,
registered holders of the Common Stock).

     Section 31. SEVERABILITY. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board determines
in its good faith judgment that severing the invalid, void or unenforceable
language from this Agreement would adversely affect the purpose or effect of
this Agreement, the right of redemption set forth in Section 23 hereof shall be
reinstated and shall not expire until the close of business on the tenth day
following the date of such determination by the Board.

     Section 32. GOVERNING LAW. This Agreement, each Right and each Rights
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of Delaware applicable to contracts made
and to be performed entirely within Delaware.

     Section 33. COUNTERPARTS. This Agreement may be executed in any number of
counterparts and each of such counterparts shall for all purposes be deemed to
be an original, and all such counterparts shall together constitute but one and
the same instrument.

                                       35
<PAGE>

     Section 34. DESCRIPTIVE HEADINGS. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

                                       36
<PAGE>

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

Attest:                                     MILLENNIUM PHARMACEUTICALS, INC.

By: /s/ JOHN B. DOUGLAS III                By:  /s/ KEVIN P. STARR
   -------------------------------              -------------------------------
Name: John B. Douglas III                       Name: Kevin P. Starr
     -----------------------------                    ----------------------
Title: Senior Vice President and               Title: Senior Vice President and
       General Counsel                                Chief Financial Officer
      ----------------------------                    ----------------------

Attest:                                     STATE STREET BANK AND TRUST COMPANY

By: /s/ DEBORAH DOUGHERTY                       By: /s/ CAROL MULVEY-EORI
   -------------------------------                 -----------------------------
Name: Deborah Dougherty                            Name: Carol Mulvey-Eori
     -----------------------------                       -----------------------
Title:Senior Account Manager                       Title: Managing Director
      ----------------------------                       -----------------------

                                       37
<PAGE>

                                                                      EXHIBIT A

                                     FORM OF

                           CERTIFICATE OF DESIGNATIONS

                                       OF

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                        MILLENNIUM PHARMACEUTICALS, INC.

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

Millennium Pharmaceuticals, Inc., a corporation organized and existing under the
laws of the State of Delaware (hereinafter called the "Corporation"), hereby
certifies that the following resolution was adopted by the Board of Directors of
the Corporation at a meeting duly called and held on April 5, 2001:

RESOLVED: That pursuant to the authority granted to and vested in the Board of
Directors of the Corporation (hereinafter called the "Board") in accordance with
the provisions of the Certificate of Incorporation, as amended, the Board hereby
creates a series of Preferred Stock, $.001 par value per share (the "Preferred
Stock"), of the Corporation and hereby states the designation and number of
shares, and fixes the relative rights, preferences and limitations thereof as
follows:

         SERIES A JUNIOR PARTICIPATING PREFERRED STOCK:

     Section 1. DESIGNATION AND AMOUNT. The shares of such series shall be
designated as "Series A Junior Participating Preferred Stock" (the "Series A
Preferred Stock") and the number of shares constituting the Series A Preferred
Stock shall be Five Hundred Thousand (500,000). Such number of shares may be
increased or decreased by resolution of the Board prior to issuance; PROVIDED,
that no decrease shall reduce the number of shares of Series A Preferred Stock
to a number less than the number of shares then outstanding plus the number of
shares reserved for issuance upon the exercise of outstanding options, rights or
warrants or upon the conversion of any outstanding securities issued by the
Corporation convertible into Series A Preferred Stock.

     Section 2. DIVIDENDS AND DISTRIBUTIONS.

     (A) Subject to the rights of the holders of any shares of any series of
Preferred Stock (or any similar stock) ranking prior and superior to the Series
A Preferred Stock with respect to dividends, the holders of shares of Series A
Preferred Stock, in preference to the holders of Common Stock, par value $.001
per share (the "Common Stock"), of the Corporation, and of any other junior
stock, shall be entitled to receive, when, as and if declared by the Board out
of funds of the Corporation legally available for the payment of dividends,
quarterly dividends payable in

                                      A-1
<PAGE>

cash on the last day of each fiscal quarter of the Corporation in each year
(each such date being referred to herein as a "Quarterly Dividend Payment
Date"), commencing on the first Quarterly Dividend Payment Date after the first
issuance of a share or fraction of a share of Series A Preferred Stock, in an
amount per share (rounded to the nearest cent) equal to the greater of (a) $10
or (b) subject to the provision for adjustment hereinafter set forth, 1,000
times the aggregate per share amount of all cash dividends, and 1,000 times the
aggregate per share amount (payable in kind) of all non-cash dividends or other
distributions, other than a dividend payable in shares of Common Stock or a
subdivision of the outstanding shares of Common Stock (by reclassification or
otherwise), declared on the Common Stock since the immediately preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment Date, since the first issuance of any share or fraction of a share of
Series A Preferred Stock. In the event the Corporation shall at any time declare
or pay any dividend on the Common Stock payable in shares of Common Stock, or
effect a subdivision, combination or consolidation of the outstanding shares of
Common Stock (by reclassification or otherwise than by payment of a dividend in
shares of Common Stock) into a greater or lesser number of shares of Common
Stock, then in each such case the amount to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event under clause (b)
of the preceding sentence shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event. In the event the Corporation shall at any time declare or pay any
dividend on the Series A Preferred Stock payable in shares of Series A Preferred
Stock, or effect a subdivision, combination or consolidation of the outstanding
shares of Series A Preferred Stock (by reclassification or otherwise than by
payment of a dividend in shares of Series A Preferred Stock) into a greater or
lesser number of shares of Series A Preferred Stock, then in each such case the
amount to which holders of shares of Series A Preferred Stock were entitled
immediately prior to such event under clause (b) of the first sentence of this
Section 2(A) shall be adjusted by multiplying such amount by a fraction, the
numerator of which is the number of shares of Series A Preferred Stock that were
outstanding immediately prior to such event and the denominator of which is the
number of shares of Series A Preferred Stock outstanding immediately after such
event.

     (B) The Corporation shall declare a dividend or distribution on the Series
A Preferred Stock as provided in paragraph (A) of this Section immediately after
it declares a dividend or distribution on the Common Stock (other than a
dividend payable in shares of Common Stock) and the Corporation shall pay such
dividend or distribution on the Series A Preferred Stock before the dividend or
distribution declared on the Common Stock is paid or set apart; provided that,
in the event no dividend or distribution shall have been declared on the Common
Stock during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $10 per share on the
Series A Preferred Stock shall nevertheless be payable on such subsequent
Quarterly Dividend Payment Date.

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

                                      A-2
<PAGE>

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

     Section 3. VOTING RIGHTS. The holders of shares of Series A Preferred Stock
shall have the following voting rights:

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

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

     (C) (i) If at any time dividends on any Series A Preferred Stock shall be
in arrears in an amount equal to six quarterly dividends thereon, the holders of
the Series A Preferred Stock, voting as a separate series from all other series
of Preferred Stock and classes of capital stock, shall be entitled to elect two
members of the Board in addition to any Directors elected by any other series,
class or classes of securities and the authorized number of Directors will
automatically be increased by two. Promptly thereafter, the Board of the
Corporation shall, as

                                      A-3
<PAGE>

soon as may be practicable, call a special meeting of holders of Series A
Preferred Stock for the purpose of electing such members of the Board. Such
special meeting shall in any event be held within 45 days of the occurrence of
such arrearage.

                 (ii) During any period when the holders of Series A Preferred
             Stock, voting as a separate series, shall be entitled and shall
             have exercised their right to elect two Directors, then, and during
             such time as such right continues, (a) the then authorized number
             of Directors shall be increased by two, and the holders of Series A
             Preferred Stock, voting as a separate series, shall be entitled to
             elect the additional Directors so provided for, and (b) each such
             additional Director shall not be a member of any existing class of
             the Board, but shall serve until the next annual meeting of
             stockholders for the election of Directors, or until his successor
             shall be elected and shall qualify, or until his right to hold such
             office terminates pursuant to the provisions of this Section 3(C).

                 (iii) A Director elected pursuant to the terms hereof may be
             removed with or without cause by the holders of Series A Preferred
             Stock entitled to vote in an election of such Director.

                 (iv) If, during any interval between annual meetings of
             stockholders for the election of Directors and while the holders of
             Series A Preferred Stock shall be entitled to elect two Directors,
             there is no such Director in office by reason of resignation, death
             or removal, then, promptly thereafter, the Board shall call a
             special meeting of the holders of Series A Preferred Stock for the
             purpose of filling such vacancy and such vacancy shall be filled at
             such special meeting. Such special meeting shall in any event be
             held within 45 days of the occurrence of such vacancy.

                 (v) At such time as the arrearage is fully cured, and all
             dividends accumulated and unpaid on any shares of Series A
             Preferred Stock outstanding are paid, and, in addition thereto, at
             least one regular dividend has been paid subsequent to curing such
             arrearage, the term of office of any Director elected pursuant to
             this Section 3(C), or his successor, shall automatically terminate,
             and the authorized number of Directors shall automatically decrease
             by two, the rights of the holders of the shares of the Series A
             Preferred Stock to vote as provided in this Section 3(C) shall
             cease, subject to renewal from time to time upon the same terms and
             conditions, and the holders of shares of the Series A Preferred
             Stock shall have only the limited voting rights elsewhere herein
             set forth.

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

                                      A-4
<PAGE>

     Section 4. CERTAIN RESTRICTIONS.

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

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

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

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

                 (iv) redeem or purchase or otherwise acquire for consideration
             any shares of Series A Preferred Stock, or any shares of stock
             ranking on a parity with the Series A Preferred Stock, except in
             accordance with a purchase offer made in writing or by publication
             (as determined by the Board) to all holders of such shares upon
             such terms as the Board, after consideration of the respective
             annual dividend rates and other relative rights and preferences of
             the respective series and classes, shall determine in good faith
             will result in fair and equitable treatment among the respective
             series or classes.

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

     Section 5. REACQUIRED SHARES. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and cancelled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of Preferred Stock
subject to the conditions and restrictions on issuance set forth herein, in the
Certificate of Incorporation, or in any other Certificate of Designations
creating a series of Preferred Stock or any similar stock or as otherwise
required by law.

                                      A-5
<PAGE>

     Section 6. LIQUIDATION, DISSOLUTION OR WINDING UP.

     (A) Upon any liquidation, dissolution or winding up of the Corporation, no
distribution shall be made (1) to the holders of shares of stock ranking junior
(either as to dividends or upon liquidation, dissolution or winding up) to the
Series A Preferred Stock unless, prior thereto, the holders of shares of Series
A Preferred Stock shall have received $1000 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not declared,
to the date of such payment, provided that the holders of shares of Series A
Preferred Stock shall be entitled to receive an aggregate amount per share,
subject to the provision for adjustment hereinafter set forth, equal to 1,000
times the aggregate amount to be distributed per share to holders of shares of
Common Stock, or (2) to the holders of shares of stock ranking on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with the
Series A Preferred Stock, except distributions made ratably on the Series A
Preferred Stock and all such parity stock in proportion to the total amounts to
which the holders of all such shares are entitled upon such liquidation,
dissolution or winding up.

     (B) Neither the consolidation, merger or other business combination of the
Corporation with or into any other corporation nor the sale, lease, exchange or
conveyance of all or any part of the property, assets or business of the
Corporation shall be deemed to be a liquidation, dissolution or winding up of
the Corporation for purposes of this Section 6.

     (C) In the event the Corporation shall at any time declare or pay any
dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision, combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the aggregate amount to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event under the proviso
in clause (1) of paragraph (A) of this Section 6 shall be adjusted by
multiplying such amount by a fraction, the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event. In the event the Corporation shall
at any time declare or pay any dividend on the Series A Preferred Stock payable
in shares of Series A Preferred Stock, or effect a subdivision, combination or
consolidation of the outstanding shares of Series A Preferred Stock (by
reclassification or otherwise than by payment of a dividend in shares of Series
A Preferred Stock) into a greater or lesser number of shares of Series A
Preferred Stock, then in each such case the aggregate amount to which holders of
shares of Series A Preferred Stock were entitled immediately prior to such event
under the proviso in clause (1) of paragraph (A) of this Section 6 shall be
adjusted by multiplying such amount by a fraction, the numerator of which is the
number of shares of Series A Preferred Stock that were outstanding immediately
prior to such event and the denominator of which is the number of shares of
Series A Preferred Stock outstanding immediately after such event.

     Section 7. CONSOLIDATION, MERGER, ETC. Notwithstanding anything to the
contrary contained herein, in case the Corporation shall enter into any
consolidation, merger, combination or other transaction in which the shares of
Common Stock are exchanged for or changed into other stock or securities, cash
and/or any other property, then in any such case each share of Series A
Preferred Stock shall at the same time be similarly exchanged or changed into an

                                      A-6
<PAGE>

amount per share, subject to the provision for adjustment hereinafter set forth,
equal to 1,000 times the aggregate amount of stock, securities, cash and/or any
other property (payable in kind), as the case may be, into which or for which
each share of Common Stock is changed or exchanged. In the event the Corporation
shall at any time declare or pay any dividend on the Common Stock payable in
shares of Common Stock, or effect a subdivision, combination or consolidation of
the outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser number
of shares of Common Stock, then in each such case the amount set forth in the
preceding sentence with respect to the exchange or change of shares of Series A
Preferred Stock shall be adjusted by multiplying such amount by a fraction, the
numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event. In
the event the Corporation shall at any time declare or pay any dividend on the
Series A Preferred Stock payable in shares of Series A Preferred Stock, or
effect a subdivision, combination or consolidation of the outstanding shares of
Series A Preferred Stock (by reclassification or otherwise than by payment of a
dividend in shares of Series A Preferred Stock) into a greater or lesser number
of shares of Series A Preferred Stock, then in each such case the amount set
forth in the first sentence of this Section 7 with respect to the exchange or
change of shares of Series A Preferred Stock shall be adjusted by multiplying
such amount by a fraction, the numerator of which is the number of shares of
Series A Preferred Stock that were outstanding immediately prior to such event
and the denominator of which is the number of shares of Series A Preferred Stock
outstanding immediately after such event.

     Section 8. NO REDEMPTION. The shares of Series A Preferred Stock shall not
be redeemable.

     Section 9. RANK. The Series A Preferred Stock shall rank, with respect to
the payment of dividends and the distribution of assets, junior to all series of
any other class of the Preferred Stock issued either before or after the
issuance of the Series A Preferred Stock, unless the terms of any such series
shall provide otherwise.

     Section 10.AMENDMENT. At such time as any shares of Series A Preferred
Stock are outstanding, the Certificate of Incorporation, as amended, of the
Corporation shall not be amended in any manner which would materially alter or
change the powers, preferences or special rights of the Series A Preferred Stock
so as to affect them adversely without the affirmative vote of the holders of at
least two-thirds of the outstanding shares of Series A Preferred Stock, voting
together as a single class.

     Section 11.FRACTIONAL SHARES. Series A Preferred Stock may be issued in
fractions of a share which shall entitle the holder, in proportion to such
holder's fractional shares, to exercise voting rights, receive dividends,
participate in distributions and have the benefit of all other rights of holders
of Series A Preferred Stock.

                                      A-7
<PAGE>

     IN WITNESS WHEREOF, this Certificate of Designations is executed on
behalf of the Corporation by its Senior Vice President and General Counsel this
5th day of April, 2001.

                             MILLENNIUM PHARMACEUTICALS, INC.

                             By:
                                ------------------------------------
                             Name:  John B. Douglas III
                             Title: Senior Vice President and General Counsel

                                      A-8
<PAGE>

                                                                      EXHIBIT B

                          [Form of Rights Certificate]

Certificate No. R-                                               ______ Rights

NOT EXERCISABLE AFTER APRIL 5, 2011 OR EARLIER IF REDEEMED OR EXCHANGED BY THE
COMPANY. THE RIGHTS ARE SUBJECT TO REDEMPTION AT $.001 PER RIGHT AND TO EXCHANGE
ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER CERTAIN CIRCUMSTANCES,
RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON (AS SUCH TERM IS DEFINED IN THE
RIGHTS AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS MAY BECOME NULL AND
VOID. [THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE
BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING PERSON OR AN
AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE
RIGHTS AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS
REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES SPECIFIED IN
SECTION 7(e) OF SUCH AGREEMENT.]1

                        MILLENNIUM PHARMACEUTICALS, INC.

                               Rights Certificate

This certifies that ____________, or registered assigns, is the registered owner
of the number of Rights set forth above, each of which entitles the owner
thereof, subject to the terms, provisions and conditions of the Rights
Agreement, dated April 5, 2001 (the "Rights Agreement"), between Millennium
Pharmaceuticals, Inc., a Delaware corporation (the "Company"), and State Street
Bank and Trust Company (the "Rights Agent"), to purchase from the Company after
the Distribution Date (as such term is defined in the Rights Agreement) and at
any time prior to 5:00 p.m. (Boston time) on April 5, 2011 at the office of the
Rights Agent designated for such purpose, or its successors as Rights Agent, one
one-thousandth of a fully paid, non-assessable share of Series A Junior
Participating Preferred Stock (the "Preferred Stock") of the Company, $.001 par
value per share, at a purchase price of $200 in cash per one one-thousandth of a
share (the "Purchase Price"), upon presentation and surrender of this Rights
Certificate with the Form of Election to Purchase and related Certificate duly
executed. The number of Rights evidenced by this Rights Certificate (and the
number of one one-thousandth of a share of Preferred Stock which may be
purchased upon exercise hereof) set forth above, and the Purchase Price set
forth above, are the number and Purchase Price as of the close of business on
April 5, 2001, based on the Preferred Stock as constituted at such date.
Capitalized terms used herein and not otherwise defined herein shall have the
meanings ascribed to such terms in the Rights Agreement.

--------
1 The portion of the legend in brackets shall be inserted only if applicable and
shall replace the preceding sentence.

                                      B-1
<PAGE>

Upon the occurrence of a Section 11(a)(ii) Event, if the Rights evidenced by
this Rights Certificate are beneficially owned by (i) an Acquiring Person or an
Affiliate or Associate of any such Acquiring Person (as such terms are defined
in the Rights Agreement), (ii) a transferee of any such Acquiring Person,
Associate or Affiliate who becomes a transferee after the Acquiring Person
becomes an Acquiring Person, or (iii) under certain circumstances specified in
the Rights Agreement, a transferee of a person who, concurrently with or after
such transfer, became an Acquiring Person, or an Affiliate or Associate of an
Acquiring Person, such Rights shall become null and void and no holder hereof
shall have any right with respect to such Rights from and after the occurrence
of such Section 11(a)(ii) Event.

As provided in the Rights Agreement, the Purchase Price and the number and kind
of shares of Preferred Stock or other securities which may be purchased upon the
exercise of the Rights evidenced by this Rights Certificate are subject to
modification and adjustment upon the happening of certain events, including
Section 11(a)(ii) Events.

This Rights Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties and immunities hereunder of the
Rights Agent, the Company and the holders of the Rights Certificates, which
limitations of rights include the temporary suspension of the exercisability of
such Rights under the specific circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are on file at the principal offices of the
Company and are available upon written request to the Company.

This Rights Certificate, with or without other Rights Certificates, upon
surrender at the office of the Rights Agent designated for such purpose, with
the Form of Election and Certificate set forth on the reverse side duly
executed, may be exchanged for another Rights Certificate or Rights Certificates
of like tenor and date evidencing Rights entitling the holder to purchase a like
aggregate number of one one-thousandths of a share of Preferred Stock as the
Rights evidenced by the Rights Certificate or Rights Certificates surrendered
shall have entitled such holder to purchase. If this Rights Certificate shall be
exercised in part, the holder shall be entitled to receive upon surrender hereof
another Rights Certificate or Rights Certificates for the number of whole Rights
not exercised.

Subject to the provisions of the Rights Agreement, the Rights evidenced by this
Certificate may be redeemed by the Company at its option at a redemption price
of $.001 per Right at any time prior to the earlier of (i) the close of business
on the tenth Business Day (or such later date as may be determined by the Board
pursuant to clause (i) of the first sentence of Section 3(a) with respect to the
Distribution Date) following the Stock Acquisition Date (or, if the Stock
Acquisition Date shall have occurred prior to the Record Date, the close of
business on the tenth Business Day following the Record Date) and (ii) the Final
Expiration Date.

Subject to the provisions of the Rights Agreement, the Company may, at its
option, at any time after a Section 11(a)(ii) Event, exchange all or part of the
Rights evidenced by this Certificate for shares of the Company's Common Stock or
for Preferred Stock (or shares of a class or series of the Company's preferred
stock having the same rights, privileges and preferences as the Preferred
Stock).

                                      B-2
<PAGE>

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

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

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

    WITNESS the facsimile signature of the proper officers of the Company and
its corporate seal.

Dated:
      -------------------

ATTEST:                                     MILLENNIUM PHARMACEUTICALS, INC.

 -------------------------                  By:
Secretary                                    -------------------------------
Title:
      ------------------------
COUNTERSIGNED:

STATE STREET BANK AND TRUST COMPANY

By:
   ---------------------------
  Authorized Signature

                                      B-3
<PAGE>

                  [Form of Reverse Side of Rights Certificate]

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such

               holder desires to transfer the Rights Certificate.)

FOR VALUE RECEIVED _____________________________________________ hereby sells,
assigns and transfers unto ___________________________________________________
______________________________________________________________________________

                  (Please print name and address of transferee)

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

Dated:
      ------------------
                                                  -----------------------------
                                                  Signature
Signature Guaranteed:

                                   Certificate

The undersigned hereby certifies that the Rights evidenced by this Rights
Certificate are not beneficially owned by, or being assigned to, an Acquiring
Person or an Affiliate or Associate thereof (as such terms are defined pursuant
to the Rights Agreement).

Dated:
      -------------------

                                                   -----------------------------
                                                   Signature
Signature Guaranteed:

                                     NOTICE

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

                                      B-4
<PAGE>

                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise

                 Rights represented by the Rights Certificate.)

To:  State Street Bank and Trust Company

The undersigned hereby irrevocably elects to exercise ___________ Rights
represented by this Rights Certificate to purchase the shares of Preferred Stock
issuable upon the exercise of the Rights (or such other securities of the
Company or of any other person which may be issuable upon the exercise of the
Rights) and requests that certificates for such shares be issued in the name of
and delivered to:

Please insert social security

or other identifying number  __________________________________________________

 ______________________________________________________________________________

                         (Please print name and address)

 ______________________________________________________________________________

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

Please insert social security

or other identifying number  __________________________________________________

 ______________________________________________________________________________

                         (Please print name and address)

 ______________________________________________________________________________

Dated:
      ------------------
                                                  -----------------------------
                                                  Signature
Signature Guaranteed:

                                      B-5
<PAGE>

                                   Certificate

     The undersigned hereby certifies by checking the appropriate boxes that:

     (1) the Rights evidenced by this Rights Certificate [ ] are [ ] are not
being exercised by or on behalf of a Person who is or was an Acquiring Person or
an Affiliate or Associate thereof (as such terms are defined pursuant to the
Rights Agreement);

     (2) after due inquiry and to the best knowledge of the undersigned, the
undersigned [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or became an Acquiring Person or an
Affiliate or Associate thereof.

Dated:
      ------------------
                                                  -----------------------------
                                                  Signature
Signature Guaranteed:

                                     NOTICE

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

                                      B-6

<PAGE>

                                                                      EXHIBIT C

                  SUMMARY OF RIGHTS TO PURCHASE PREFERRED STOCK

On April 5, 2001, the Board of Directors of Millennium Pharmaceuticals, Inc.
(the "Company"), declared a dividend of one Right for each outstanding share of
the Company's Common Stock to stockholders of record at the close of business on
April 16, 2001 (the "Record Date"). Each Right entitles the registered holder to
purchase from the Company one one-thousandth of a share of Series A Junior
Participating Preferred Stock, $.001 par value per share (the "Preferred
Stock"), at a Purchase Price of $200 in cash, subject to adjustment. The
description and terms of the Rights are set forth in a Rights Agreement dated
April 5, 2001 (the "Rights Agreement") between the Company and State Street Bank
and Trust Company, as Rights Agent.

Initially, the Rights are not exercisable and will be attached to all
certificates representing outstanding shares of Common Stock, and no separate
Rights Certificates will be distributed. The Rights will separate from the
Common Stock, and the Distribution Date will occur, upon the earlier of (i) 10
business days following the first date of a public announcement that a person or
group of affiliated or associated persons (an "Acquiring Person") has acquired,
or obtained the right to acquire, beneficial ownership of 15% or more of the
outstanding shares of Common Stock (the "Stock Acquisition Date"), or (ii) 10
business days following the commencement of a tender offer or exchange offer
that would result in a person or group beneficially owning 15% or more of the
outstanding shares of Common Stock. The Distribution Date may be deferred in
circumstances determined by the Board of Directors. In addition, certain
inadvertent acquisitions will not trigger the occurrence of the Distribution
Date. Until the Distribution Date (or earlier redemption or expiration of the
Rights), (i) the Rights will be evidenced by the Common Stock certificates
outstanding on the Record Date, together with this Summary of Rights, or by new
Common Stock certificates issued after the Record Date which contain a notation
incorporating the Rights Agreement by reference, (ii) the Rights will be
transferred with and only with such Common Stock certificates; and (iii) the
surrender for transfer of any certificates for Common Stock outstanding (with or
without a copy of this Summary of Rights or such notation) will also constitute
the transfer of the Rights associated with the Common Stock represented by such
certificate.

The Rights are not exercisable until the Distribution Date and will expire upon
the close of business on April 5, 2011 (the "Final Expiration Date") unless
earlier redeemed or exchanged as described below. As soon as practicable after
the Distribution Date, separate Rights Certificates will be mailed to holders of
record of the Common Stock as of the close of business on the Distribution Date
and, thereafter, the separate Rights Certificates alone will represent the
Rights. Except as otherwise determined by the Board of Directors, and except for
shares of Common Stock issued upon exercise, conversion or exchange of then
outstanding options, convertible or exchangeable securities or other contingent
obligations to issue shares or pursuant to any employee benefit plan or
arrangement, only shares of Common Stock issued prior to the Distribution Date
will be issued with Rights.

In the event that any Person becomes an Acquiring Person, unless the event
causing the 15% threshold to be crossed is a Permitted Offer (as defined in the
Rights Agreement), then, promptly following the first occurrence of such event,
each holder of a Right (except as provided below and in Section 7(e) of the
Rights Agreement) shall thereafter have the right to receive, upon exercise,
that number of shares of Common Stock of the Company (or, in certain
circumstances,

                                      C-1
<PAGE>

cash, property or other securities of the Company) which equals the exercise
price of the Right divided by 50% of the current market price (as defined in the
Rights Agreement) per share of Common Stock at the date of the occurrence of
such event. However, Rights are not exercisable following such event until such
time as the Rights are no longer redeemable by the Company as described below.
Notwithstanding any of the foregoing, following the occurrence of such event,
all Rights that are, or (under certain circumstances specified in the Rights
Agreement) were, beneficially owned by any Acquiring Person will be null and
void. The event summarized in this paragraph is referred to as a "Section
11(a)(ii) Event."

For example, at an exercise price of $200.00 per Right, each Right not owned by
an Acquiring Person (or by certain related parties) following a Section
11(a)(ii) Event would entitle its holder to purchase for $200.00 such number of
shares of Common Stock (or other consideration, as noted above) as equals
$200.00 divided by one-half of the current market price (as defined in the
Rights Agreement) of the Common Stock. Assuming that the Common Stock had a
market price of $50.00 per share at such time, the holder of each valid Right
would be entitled to purchase eight shares of Common Stock, having a market
value of 8 x $50, or $400, for $200.00.

In the event that, at any time after any Person becomes an Acquiring Person, (i)
the Company is consolidated with, or merged with and into, another entity and
the Company is not the surviving entity of such consolidation or merger (other
than a consolidation or merger which follows a Permitted Offer) or if the
Company is the surviving entity, but shares of its outstanding Common Stock are
changed or exchanged for stock or securities (of any other person) or cash or
any other property, or (ii) more than 50% of the Company's assets or earning
power is sold or transferred, each holder of a Right (except Rights which
previously have been voided as set forth above) shall thereafter have the right
to receive, upon exercise, that number of shares of common stock of the
acquiring company which equals the exercise price of the Right divided by 50% of
the current market price (as defined in the Rights Agreement) of such common
stock at the date of the occurrence of the event. The events summarized in this
paragraph are referred to as "Section 13 Events." A Section 11(a)(ii) Event and
Section 13 Events are collectively referred to as "Triggering Events."

For example, at an exercise price of $200.00 per Right, each valid Right
following a Section 13 Event would entitle its holder to purchase for $200.00
such number of shares of common stock of the acquiring company as equals $200.00
divided by one-half of the current market price (as defined in the Rights
Agreement) of such common stock. Assuming that such common stock had a market
price of $50.00 per share at such time, the holder of each valid Right would be
entitled to purchase eight shares of common stock of the acquiring company,
having a market value of 8 x $50, or $400, for $200.00.

At any time after the occurrence of a Section 11(a)(ii) Event, when no person
owns a majority of the Common Stock, the Board of Directors of the Company may
exchange the Rights (other than Rights owned by such Acquiring Person which have
become void), in whole or in part, at an exchange ratio of one share of Common
Stock, or one one-thousandth of a share of Preferred Stock (or of a share of a
class or series of the Company's preferred stock having equivalent rights,
preferences and privileges), per Right (subject to adjustment).

                                      C-2
<PAGE>

The Purchase Price payable, and the number of units of Preferred Stock or other
securities or property issuable, upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Stock, (ii) if holders of the Preferred Stock are granted certain rights or
warrants to subscribe for Preferred Stock or convertible securities at less than
the then-current market price (as defined in the Rights Agreement) of the
Preferred Stock, or (iii) upon the distribution to holders of the Preferred
Stock of evidences of indebtedness or assets (excluding regular periodic cash
dividends paid out of earnings or retained earnings) or of subscription rights
or warrants (other than those referred to above). The number of Rights
associated with each share of Common Stock is also subject to adjustment in the
event of a stock split of the Common Stock or a stock dividend on the Common
Stock payable in Common Stock or subdivisions, consolidations or combinations of
the Common Stock occurring, in any such case, prior to the Distribution Date.

With certain exceptions, no adjustment in the Purchase Price will be required
until cumulative adjustments amount to at least 1% of the Purchase Price. No
fractional shares of Preferred Stock (other than fractions which are integral
multiples of one one-thousandth of a share of Preferred Stock) will be issued
and, in lieu thereof, an adjustment in cash will be made based on the market
price of the Preferred Stock on the last trading date prior to the date of
exercise.

Preferred Stock purchasable upon exercise of the Rights will not be redeemable.
Each share of Preferred Stock will be entitled to receive, when, as and if
declared by the Board of Directors, a minimum preferential quarterly dividend
payment of $10 per share or, if greater, an aggregate dividend of 1000 times the
dividend declared per share of Common Stock. In the event of liquidation, the
holders of the Preferred Stock will be entitled to a minimum preferential
liquidation payment of $1000 per share, plus an amount equal to accrued and
unpaid dividends, and will be entitled to an aggregate payment of 1000 times the
payment made per share of Common Stock. Each share of Preferred Stock will have
1000 votes, voting together with the Common Stock. In the event of any merger,
consolidation or other transaction in which Common Stock is changed or
exchanged, each share of Preferred Stock will be entitled to receive 1000 times
the amount received per share of Common Stock. These rights are protected by
customary antidilution provisions. Because of the nature of the Preferred
Stock's dividend, liquidation and voting rights, the value of one one-thousandth
of a share of Preferred Stock purchasable upon exercise of each Right should
approximate the value of one share of Common Stock.

At any time prior to the earlier of the tenth Business Day (or such later date
as may be determined by the Board of Directors of the Company) after the Stock
Acquisition Date, the Company may redeem the Rights in whole, but not in part,
at a price of $.001 per Right (the "Redemption Price"), payable in cash or
stock. Immediately upon the redemption of the Rights or such earlier time as
established by the Board in the resolution ordering the redemption of the
Rights, the Rights will terminate and the only right of the holders of Rights
will be to receive the Redemption Price. The Rights may also be redeemable
following certain other circumstances specified in the Rights Agreement.

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

                                      C-3
<PAGE>

distribution of the Rights should not be taxable to stockholders or to the
Company, stockholders may, depending upon the circumstances, recognize taxable
income in the event that the Rights become exercisable for Common Stock (or
other consideration) of the Company or for common stock of the acquiring company
as set forth above.

Any provision of the Rights Agreement, other than the redemption price, may be
amended by the Board prior to such time as the Rights are no longer redeemable.
Once the Rights are no longer redeemable, the Board's authority to amend the
Rights is limited to correcting ambiguities or defective or inconsistent
provisions in a manner that does not adversely affect the interest of holders of
Rights.

The Rights are intended to protect the stockholders of the Company in the event
of an unfair or coercive offer to acquire the Company and to provide the Board
with adequate time to evaluate unsolicited offers. The Rights may have
anti-takeover effects. The Rights will cause substantial dilution to a person or
group that attempts to acquire the Company without conditioning the offer on a
substantial number of Rights being acquired. The Rights, however, should not
affect any prospective offeror willing to make an offer at a fair price and
otherwise in the best interests of the Company and its stockholders, as
determined by a majority of the Board. The Rights should not interfere with any
merger or other business combination approved by the Board.

A copy of the Rights Agreement has been filed with the Securities and Exchange
Commission as an Exhibit to the Company's Current Report on Form 8-K dated April
5, 2001. A copy of the Rights Agreement is available free of charge from the
Company. This summary description of the Rights does not purport to be complete
and is qualified in its entirety by reference to the Rights Agreement, which is
incorporated herein by reference.

                                      C-4

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