MILLENNIUM PHARMACEUTICALS INC
8-K, EX-1.1, 2000-10-06
PHARMACEUTICAL PREPARATIONS
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                                                                    EXHIBIT 1.1

                           MILLENNIUM PHARMACEUTICALS, INC.

                            Common Stock, par value $0.001
                                ----------------------

                                UNDERWRITING AGREEMENT

                                                                October 5, 2000

Goldman, Sachs & Co.,
Morgan Stanley & Co. Incorporated,
Robertson Stephens, Inc.,
Credit Suisse First Boston Corporation,

c/o Goldman, Sachs & Co.,
       85 Broad Street,
              New York, New York 10004; and

      Morgan Stanley & Co. Incorporated,
       1585 Broadway,
              New York, New York 10036.

Ladies and Gentlemen:

       Millennium Pharmaceuticals, Inc., a Delaware corporation (the
"Company"), proposes, subject to the terms and conditions stated herein, to
issue and sell to the Underwriters named in Schedule I hereto (the
"Underwriters") an aggregate of 11,000,000 shares (the "Firm Shares") and, at
the election of the Underwriters, up to 1,650,000 additional shares (the
"Optional Shares") of Common Stock, par value $0.001 ("Stock") of the Company
(the Firm Shares and the Optional Shares that the Underwriters elect to
purchase pursuant to Section 2 hereof being collectively called the "Shares").

       1.     The Company represents and warrants to, and agrees with, each of
the Underwriters that:

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              (a) A registration statement on Form S-3 (File No 333-42770) (the
       "Initial Registration Statement") in respect of the Shares has been filed
       with the Securities and Exchange Commission (the "Commission"); the
       Initial Registration Statement and any post-effective amendment thereto,
       each in the form heretofore delivered or to be delivered to you and,
       excluding exhibits to the Initial Registration Statement, but including
       all documents incorporated by reference in the prospectus included
       therein, to the Representatives for each of the other Underwriters have
       been declared effective by the Commission in such form; other than a
       registration statement, if any, increasing the size of the offering (a
       "Rule 462(b) Registration Statement"), filed pursuant to Rule 462(b)
       under the Securities Act of 1933, as amended (the "Act"), which became
       effective upon filing, no other document, other than documents
       incorporated by reference into the Prospectus (as defined below), with
       respect to the Initial Registration Statement or document incorporated by
       reference therein has heretofore been filed, or transmitted for filing,
       with the Commission (other than prospectuses filed pursuant to Rule
       424(b) of the rules and regulations of the Commission under the Act, each
       in the form heretofore delivered to the Representatives); and no stop
       order suspending the effectiveness of the Initial Registration Statement,
       any post-effective amendment thereto or the Rule 462(b) Registration
       Statement, if any, has been issued and no proceeding for that purpose has
       been initiated or threatened by the Commission (any preliminary
       prospectus included in the Initial Registration Statement or filed with
       the Commission pursuant to Rule 424(a) under the Act, is hereinafter
       called a "Preliminary Prospectus"; the various parts of the Initial
       Registration Statement and the Rule 462(b) Registration Statement, if
       any, including all exhibits thereto and the documents incorporated by
       reference in the prospectus contained in the Initial Registration
       Statement at the time such part of the Initial Registration Statement
       became effective, each as amended at the time such part of the Initial
       Registration Statement became effective, are hereinafter collectively
       called the "Registration Statement"; the prospectus relating to the
       Shares, in the form in which it has most recently been filed, or
       transmitted for filing, with the Commission on or prior to the date of
       this Agreement, is hereinafter called the "Prospectus"; any reference
       herein to any Preliminary Prospectus or the Prospectus shall be deemed to
       refer to and include the documents incorporated by reference therein
       pursuant to the applicable form under the Act, as of the date of such
       Preliminary Prospectus or Prospectus, as the case may be; any reference
       to any amendment or supplement to any Preliminary Prospectus or the
       Prospectus shall be deemed to refer to and include any documents filed
       after the date of such Preliminary Prospectus or Prospectus, as the case
       may be, under the Securities Exchange Act of 1934, as amended (the
       "Exchange Act"), and incorporated by reference in such Preliminary
       Prospectus or Prospectus, as the case may be; any reference to any
       amendment to the Initial Registration Statement shall be deemed to refer
       to and include any annual report of the Company filed pursuant to Section
       13(a) or 15(d) of

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       the Exchange Act after the effective date of the Registration Statement
       that is incorporated by reference in the Registration Statement; and
       any reference to the Prospectus as amended or supplemented shall be
       deemed to refer to the Prospectus as amended or supplemented in
       relation to the Shares in the form in which it is filed with the
       Commission pursuant to Rule 424(b) under the Act in accordance with
       Section 5(a) hereof, including any documents incorporated by
       reference therein as of the date of such filing);

              (b)    The documents incorporated by reference in the Prospectus,
       when they became effective or were filed with the Commission, as the case
       may be, conformed in all material respects to the requirements of the Act
       or the Exchange Act, as applicable, and the rules and regulations of the
       Commission thereunder, and none of such documents contained an untrue
       statement of a material fact or omitted to state a material fact required
       to be stated therein or necessary to make the statements therein not
       misleading; and any further documents so filed and incorporated by
       reference in the Prospectus or any further amendment or supplement
       thereto, when such documents become effective or are filed with the
       Commission, as the case may be, will conform in all material respects to
       the requirements of the Act or the Exchange Act, as applicable, and the
       rules and regulations of the Commission thereunder and will not contain
       an untrue statement of a material fact or omit to state a material fact
       required to be stated therein or necessary to make the statements therein
       not misleading; provided, however, that this representation and warranty
       shall not apply to any statements or omissions made in reliance upon and
       in conformity with information furnished in writing to the Company by an
       Underwriter through Goldman, Sachs & Co. or Morgan Stanley & Co.
       Incorporated expressly for use therein;

              (c)    The Registration Statement and the Prospectus as amended or
       supplemented conform, and any further amendments or supplements to the
       Registration Statement or the Prospectus will conform, in all material
       respects to the requirements of the Act and the rules and regulations of
       the Commission thereunder and do not and will not, as of the applicable
       effective date as to the Registration Statement and any amendment
       thereto, and as of the applicable filing date as to the Prospectus and
       any amendment or supplement thereto, contain an untrue statement of a
       material fact or omit to state a material fact required to be stated
       therein or necessary to make the statements therein not misleading;
       PROVIDED, HOWEVER, that this representation and warranty shall not apply
       to any statements or omissions made in reliance upon and in conformity
       with information furnished in writing to the Company by an Underwriter
       through Goldman, Sachs & Co. or Morgan Stanley & Co. Incorporated
       expressly for use therein;

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              (d)    The Company and their subsidiaries (taken as a whole) have
       not sustained since the date of the latest audited financial statements
       included or incorporated by reference in the Prospectus any material loss
       or interference with their business from fire, explosion, flood or other
       calamity, whether or not covered by insurance, or from any labor dispute
       or court or governmental action, order or decree, otherwise than as set
       forth or contemplated in the Prospectus; and, since the respective dates
       as of which information is given in the Registration Statement and the
       Prospectus, there has not been any change in the capital stock
       (excluding stock option grants in the ordinary course of business
       pursuant to the Company's current stock option plans and exercise of any
       outstanding stock options or warrants or conversion of outstanding
       convertible securities) or increase or material decrease in the long-term
       debt (including obligations under capital leases) of the Company or any
       of its subsidiaries or any material adverse change, or any development
       involving a prospective material adverse change, in or affecting the
       general affairs, management, financial position, holders' equity or
       results of operations of the Company and its subsidiaries (taken as a
       whole), otherwise than as set forth or contemplated in the Prospectus;

              (e)    The Company and its subsidiaries do not own any real
       property and have good and marketable title to all personal property
       owned by them, in each case free and clear of all liens, encumbrances and
       defects except such as are described in the Prospectus or such as do not
       materially affect the value of such property and do not materially
       interfere with the use made and proposed to be made of such property by
       the Company and its subsidiaries; and any material real property and
       buildings held under lease by the Company and its subsidiaries are held
       by them under valid, subsisting and enforceable leases with such
       exceptions as do not materially affect the value of the property and do
       not materially interfere with the use made and proposed to be made of
       such property and buildings by the Company and its subsidiaries;

              (f)    The Company has been duly incorporated and is validly
       existing as a corporation in good standing under the laws of the State of
       Delaware with power and authority (corporate and other) to own its
       properties and conduct its business as described in the Prospectus, and
       has been duly qualified as a foreign corporation for the transaction of
       business and is in good standing under the laws of each other
       jurisdiction in which it owns or leases properties or conducts any
       business so as to require such qualification, or is subject to no
       material liability or disability by reason of the failure to be so
       qualified in any such jurisdiction and each subsidiary of the Company has
       been duly incorporated and is validly existing as a corporation in good
       standing under the laws of its jurisdiction of incorporation;

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              (g)    The Company has an authorized capitalization as set forth
       in the Prospectus, and all of the issued shares of capital stock of the
       Company have been duly and validly authorized and issued, are fully paid
       and non-assessable and conform to the description of the Stock contained
       in the Prospectus; and all of the issued shares of capital stock of each
       subsidiary of the Company have been duly and validly authorized and
       issued, are fully paid and non-assessable and (except for directors'
       qualifying shares and except as set forth in the Prospectus) are owned
       directly or indirectly by the Company, free and clear of all liens,
       encumbrances, equities or claims;

              (h)    The unissued Shares to be issued and sold by the Company to
       the Underwriters hereunder have been duly and validly authorized and,
       when issued and delivered against payment therefor as provided herein,
       will be duly and validly issued and fully paid and non-assessable and
       will conform to the description of the Stock contained in the Prospectus;

              (i)    The issue and sale of the Shares by the Company and the
       compliance by the Company with all of the provisions of this Agreement
       and the consummation of the transactions herein contemplated will not
       conflict with or result in a breach or violation of any of the terms or
       provisions of, or constitute a default under, any indenture, mortgage,
       deed of trust, loan agreement, stockholder agreement, collaboration
       agreement, license agreement, research agreement or other agreement or
       instrument to which the Company or any of its subsidiaries is a party or
       by which the Company or any of its subsidiaries is bound or to which any
       of the property or assets of the Company or any of its subsidiaries is
       subject, other than any conflict, breach, default or violation which
       would not, individually or in the aggregate, have a material adverse
       effect on the business, prospects, current or future financial position,
       stockholders' equity or results of operations of the Company and its
       subsidiaries (taken as a whole) or on the ability of the Company to
       consummate the transactions contemplated herein (a "Material Adverse
       Effect") nor will such action result in any violation of the provisions
       of the Certificate of Incorporation or By-laws of the Company or any
       statute or any order, rule or regulation of any court or governmental
       agency or body having jurisdiction over the Company or any of its
       subsidiaries or any of their properties; and no consent, approval,
       authorization, order, registration or qualification of or with any such
       court or governmental agency or body is required for the issue and sale
       of the Shares or the consummation by the Company of the transactions
       contemplated by this Agreement, except the registration under the Act of
       the Shares and such consents, approvals, authorizations, registrations or
       qualifications as may be required under state securities or Blue Sky laws
       in connection with the purchase and distribution of the Shares by the
       Underwriters;

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              (j)    Neither the Company nor any of its subsidiaries is (i) in
       violation of its Certificate of Incorporation or By-laws or (ii) in
       default in the performance or observance of (x) any material obligation,
       agreement, covenant or condition contained in any indenture, mortgage,
       deed of trust, loan agreement, lease or (y) other agreement or instrument
       to which it is a party or by which it or any of its properties may be
       bound, other than defaults, in the case of clause (ii) (y), which would
       not, individually or in the aggregate, have a Material Adverse Effect;

              (k)    Each of the collaboration or strategic alliance agreements
       set forth in Schedule III (the "Strategic Alliance Agreements") is in
       full force and effect and constitutes a valid and binding agreement
       between the parties thereto, enforceable in accordance with its terms,
       subject to bankruptcy, insolvency, reorganization and other laws of
       general applicability relating to or affecting creditors' rights and to
       general equity principles, and there has not occurred any default under
       any Strategic Alliance Agreement or any event that with the giving of
       notice or lapse of time would constitute a default thereunder which would
       individually or in the aggregate, have a Material Adverse Effect;

              (l)    The statements set forth in the Prospectus as amended or
       supplemented under the caption "Description of Common Stock and Preferred
       Stock", insofar as they purport to constitute a summary of the terms of
       the Stock, and under the captions "Plan of Distribution" and
       "Underwriting", insofar as they purport to describe the provisions of the
       laws and documents referred to therein, are accurate and complete in all
       material respects;

              (m)    Other than as set forth in the Prospectus, there are no
       legal or governmental proceedings pending to which the Company or any of
       its subsidiaries is a party or of which any property of the Company or
       any of its subsidiaries is the subject which, if determined adversely to
       the Company or any of its subsidiaries, would individually or in the
       aggregate have a Material Adverse Effect; and, to the best of the
       Company's knowledge, no such proceedings are threatened or contemplated
       by governmental authorities or threatened by others;

              (n)    The Company is not and, after giving effect to the offering
       and sale of the Shares, will not be an "investment company", as such term
       is defined in the Investment Company Act of 1940, as amended (the
       "Investment Company Act");

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              (o)    The Company is conducting business in compliance with all
       applicable statutes, rules, regulations, standards, guides and orders
       administered or issued by any governmental or regulatory authority in the
       jurisdictions in which it is conducting business, including without
       limitation the United States Food and Drug Administration, except where
       the failure to be so in compliance would not have, individually or in the
       aggregate, a Material Adverse Effect;

              (p)    The Company is not in violation of any statute, or any
       rule, regulation, decision or order of any governmental agency or body or
       any court relating to the use, disposal or release of hazardous or toxic
       substances or relating to the protection or restoration of the
       environment or human exposure to hazardous or toxic substances
       (collectively, "environmental laws"), does not own or operate any real
       property which to its knowledge is contaminated with any substance that
       is subject to any environmental laws, is not to its knowledge liable for
       any off-site disposal or contamination pursuant to any environmental
       laws, and is not subject to any claim relating to any environmental laws,
       which violation, contamination, liability or claim would have,
       individually or in the aggregate, a Material Adverse Effect; and the
       Company is not aware of any pending investigation which could reasonably
       be expected to lead to such a claim;

              (q)    The Company owns or has valid, binding, enforceable
       licenses or other rights to use any patents, patent licenses, trademarks,
       trade names, service marks, service names, copyrights, and other
       proprietary intellectual property rights ("Intellectual Property")
       necessary to conduct the business of the Company in the manner in which
       it has been and is contemplated to be conducted (as described in the
       Prospectus), without any conflict with the rights of others, except for
       such conflicts as are referred to in the Prospectus, or as would not have
       a Material Adverse Effect; the Company or its assignor has duly and
       properly filed with the United States Patent and Trademark Office the
       pending patent applications referred to in the Prospectus (the "Patent
       Applications"); the information contained in the Registration Statement
       and Prospectus concerning the Patent Applications and patents licensed to
       the Company is accurate in all material respects; and the Company has not
       received any notice from any other person of infringement of or conflict
       with (and knows of no such infringement of or conflict with) asserted
       rights of others with respect to any Intellectual Property or any trade
       secrets, proprietary information, inventions, know-how, processes and
       procedures owned or used by or licensed to the Company which, if
       determined adversely to the Company, would have, individually or in the
       aggregate, a Material Adverse Effect; and

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              (r)    Ernst & Young LLP, who have certified certain financial
       statements of the Company and its subsidiaries, Arthur Andersen LLP, who
       have certified certain financial statements of LeukoSite, Inc. and L&I
       Partners, L.P., and PricewaterhouseCoopers, LLP who have certified
       certain financial statements of Cytomed, Inc. are each independent public
       accountants as required by the Act and the rules and regulations of the
       Commission thereunder.

       2.     Subject to the terms and conditions herein set forth, (a) the
Company agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company, at
a purchase price per share of $61.60, the number of Firm Shares set forth
opposite the name of such Underwriter in Schedule I hereto and (b) in the event
and to the extent that the Underwriters shall exercise the election to purchase
Optional Shares as provided below, the Company agrees to issue and sell to each
of the Underwriters, and each of the Underwriters agrees, severally and not
jointly, to purchase from the Company, at the purchase price per share set forth
in clause (a) of this Section 2, that portion of the number of Optional Shares
as to which such election shall have been exercised (to be adjusted by you so as
to eliminate fractional shares) determined by multiplying such number of
Optional Shares by a fraction, the numerator of which is the maximum number of
Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of Optional Shares that all of the Underwriters
are entitled to purchase hereunder.

       The Company hereby grants to the Underwriters the right to purchase at
their election up to 1,650,000 Optional Shares, at the purchase price per share
set forth in the paragraph above, for the sole purpose of covering sales of
shares in excess of the number of Firm Shares.  Any such election to purchase
Optional Shares may be exercised only by written notice from you to the Company,
given within a period of 30 calendar days after the date of this Agreement,
setting forth the aggregate number of Optional Shares to be purchased and the
date on which such Optional Shares are to be delivered, as determined by you but
in no event earlier than the First Time of Delivery (as defined in Section 4
hereof) or, unless you and the Company otherwise agree in writing, earlier than
two or later than ten business days after the date of such notice.

       3.     Upon the authorization by you of the release of the Firm Shares,
the several Underwriters propose to offer the Firm Shares for sale upon the
terms and conditions set forth in the Prospectus.

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       4.     (a) The Shares to be purchased by each Underwriter hereunder, in
definitive form, and in such authorized denominations and registered in such
names as Goldman, Sachs & Co. and Morgan Stanley & Co. Incorporated may request
upon at least forty-eight hours' prior notice to the Company shall be delivered
by or on behalf of the Company to Goldman, Sachs & Co. and Morgan Stanley & Co.
Incorporated, through the facilities of The Depository Trust Company ("DTC") for
the account of such Underwriter, against payment by or on behalf of such
Underwriter of the purchase price therefor by wire transfer of Federal
(same-day) funds to the account specified by the Company to Goldman, Sachs & Co.
and Morgan Stanley & Co. Incorporated at least forty-eight hours in advance.
The Company will cause the certificates representing the Shares to be made
available for checking and packaging at least twenty-four hours prior to the
Time of Delivery (as defined below) with respect thereto at the office of DTC or
its designated custodian (the "Designated Office"). The time and date of such
delivery and payment shall be, with respect to the Firm Shares, 9:30 a.m., New
York City time, on October 10, 2000 or such other time and date as Goldman,
Sachs & Co., Morgan Stanley & Co. Incorporated  and the Company may agree upon
in writing, and, with respect to the Optional Shares, 9:30 a.m., New York time,
on the date specified by Goldman, Sachs & Co. and Morgan Stanley & Co.
Incorporated in the written notice given by Goldman, Sachs & Co. and Morgan
Stanley & Co. Incorporated of the Underwriters' election to purchase such
Optional Shares, or such other time and date as Goldman, Sachs & Co. and the
Company may agree upon in writing.  Such time and date for delivery of the Firm
Shares is herein called the "First Time of Delivery", such time and date for
delivery of the Optional Shares, if not the First Time of Delivery, is herein
called the "Second Time of Delivery", and each such time and date for delivery
is herein called a "Time of Delivery".

              (b)    The documents to be delivered at each Time of Delivery by
       or on behalf of the parties hereto pursuant to Section 7 hereof,
       including the cross receipt for the Shares and any additional documents
       requested by the Underwriters pursuant to Section 7(o) hereof, will be
       delivered at the offices of Hale and Dorr LLP, 60 State Street, Boston,
       MA 02109 (the "Closing Location"), and the Shares will be delivered at
       the Designated Office, all at 9:30 a.m., such Time of Delivery.  A
       meeting will be held at the Closing Location at 3:00 p.m., New York City
       time, on the New York Business Day next preceding such Time of Delivery,
       at which meeting the final drafts of the documents to be delivered
       pursuant to the preceding sentence will be available for review by the
       parties hereto.  For the purposes of this Section 4, "New York Business
       Day" shall mean each Monday, Tuesday, Wednesday, Thursday and Friday
       which is not a day on which banking institutions in New York are
       generally authorized or obligated by law or executive order to close.

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       5.     The Company agrees with each of the Underwriters:

              (a)    To prepare the Prospectus as amended and supplemented in
       relation to the Shares in a form approved by you and to file such
       Prospectus pursuant to Rule 424(b) not later than the Commission's close
       of business on the second business day following the execution and
       delivery of this Agreement, or, if applicable, such earlier time as may
       be required by Rule 424(b) under the Act; to make no further amendment or
       any supplement to the Registration Statement or Prospectus as amended and
       supplemented in relation to the Shares prior to the last Time of Delivery
       which shall be disapproved by you promptly after reasonable notice
       thereof; to advise you, promptly after it receives notice thereof, of the
       time when any amendment to the Registration Statement has been filed or
       becomes effective or any supplement to the Prospectus or any amended
       Prospectus has been filed and to furnish you with copies thereof; to file
       promptly all reports and any definitive proxy or information statements
       required to be filed by the Company with the Commission pursuant to
       Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act for so long as the
       delivery of a prospectus is required in connection with the offering or
       sale of the Shares; and during such same period to advise you, promptly
       after it receives notice thereof, of the time when any amendment to the
       Registration Statement has been filed or becomes effective or any
       supplement to the Prospectus or any amended Prospectus has been filed the
       Commission, of the issuance by the Commission of any stop order or of any
       order preventing or suspending the use of any prospectus relating to the
       Shares, of the suspension of the qualification of the Shares for offering
       or sale in any jurisdiction, of the initiation or threatening of any
       proceeding for any such purpose, or of any request by the Commission for
       the amending or supplementing of the Registration Statement or Prospectus
       or for additional information; and, in the event of the issuance of any
       stop order or of any order preventing or suspending the use of any
       prospectus relating to the Shares or suspending any such qualification,
       promptly to use its best efforts to obtain the withdrawal of such order;

              (b)    Promptly from time to time to take such action as you may
       reasonably request to qualify the Shares for offering and sale under the
       securities laws of such jurisdictions as you may request and to comply
       with such laws so as to permit the continuance of sales and dealings
       therein in such jurisdictions for as long as may be necessary to complete
       the distribution of the Shares, provided that in connection therewith the
       Company shall not be required to qualify as a foreign corporation or to
       file a general consent to service of process in any jurisdiction;

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              (c)    Prior to 5:00 P.M., New York City time, on the New York
       Business Day next succeeding the date of this Agreement and from time to
       time, to furnish the Underwriters with written and electronic copies of
       the Prospectus as amended or supplemented in New York City in such
       quantities as you may reasonably request, and, if the delivery of a
       prospectus is required at any time in connection with the offering or
       sale of the Shares and if at such time any event shall have occurred as a
       result of which the Prospectus as then amended or supplemented would
       include an untrue statement of a material fact or omit to state any
       material fact necessary in order to make the statements therein, in the
       light of the circumstances under which they were made when such
       Prospectus is delivered, not misleading, or, if for any other reason it
       shall be necessary during such same period to amend or supplement the
       Prospectus or to file under the Exchange Act any document incorporated by
       reference in the Prospectus in order to comply with the Act or the
       Exchange Act, to notify you and upon your request to file such document
       and to prepare and furnish without charge to each Underwriter and to any
       dealer in securities as many written and electronic copies as you may
       from time to time reasonably request of an amended Prospectus or a
       supplement to the Prospectus which will correct such statement or
       omission or effect such compliance;

              (d)    To make generally available to its securityholders as soon
       as practicable, but in any event not later than eighteen months after the
       effective date of the Registration Statement (as defined in Rule 158(c)
       under the Act), an earnings statement of the Company and its subsidiaries
       (which need not be audited) complying with Section 11(a) of the Act and
       the rules and regulations thereunder (including, at the option of the
       Company, Rule 158);

              (e)    To use the net proceeds received by it from the sale of the
       Shares pursuant to this Agreement in the manner specified in the
       Prospectus under the caption "Use of Proceeds";

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              (f)    During the period beginning from the date hereof and
       continuing until the date 90 days after the date of this Agreement, not
       to offer, sell, contract to sell or otherwise dispose of, except as
       provided hereunder, any securities of the Company that are substantially
       similar to the Shares, including but not limited to any securities that
       are convertible into, or exchangeable for, or that represent the right to
       receive, Stock or any such substantially similar securities other than
       (i) pursuant to stock option plans and employee stock purchase plans
       existing on, or upon the conversion or exchange of convertible or
       exchangeable securities outstanding as of, the date of this Agreement, or
       (ii) the issuance by the Company of shares of the Stock as consideration
       for mergers, acquisitions, other business combinations, or strategic
       alliances, occurring after the date of this Agreement, provided that each
       recipient of shares pursuant to this clause (ii) agrees that all such
       shares remain subject to restrictions substantially similar to those
       contained in this subsection; and that the Company will use reasonable
       efforts to cause each person who has entered into a Lock-up Agreement (as
       defined in paragraph (g) below) to comply therewith;

              (g)    To cause each of the persons listed in Schedule 2 to this
       Agreement to execute and deliver to you a lock-up agreement in
       substantially the form of Annex II attached hereto (a "Lock-up
       Agreement");

              (h)    To seek to enforce, and not waive its rights with respect
       to, the obligations of (i) Bayer AG, a corporation of the Federal
       Republic of Germany ("Bayer"), under Article V(a) of the Investment
       Agreement between Bayer and the Company, dated as of September 22, 1998,
       and (ii) Aventis Pharmaceuticals, Inc., a Delaware corporation
       ("Aventis"), under Article V of the Investment Agreement between Aventis
       and the Company, dated as of June 22, 2000, during the period beginning
       from the date of this Agreement and continuing until and including the
       date 90 days after the date of this Agreement;

              (i)    To use its best efforts to list for quotation the Shares on
       the National Association of Securities Dealers Automated Quotations
       National Market System ("NASDAQ");

              (j)    Upon request of any Underwriter, to furnish, or cause to be
       furnished, to such Underwriter an electronic version of the Company's
       trademarks, servicemarks and corporate logo for use on the website, if
       any, operated by such Underwriter for the purpose of facilitating the
       on-line offering of the Shares (the "License"); PROVIDED, HOWEVER, that
       the License shall be used solely for the purpose described above, is
       granted without any fee and may not be assigned or transferred; and

                                       12

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              (k)    If the Company elects to rely upon Rule 462(b), the Company
       shall file a Rule 462(b) Registration Statement with the Commission in
       compliance with Rule 462(b) by 10:00 P.M., Washington, D.C. time, on the
       date of this Agreement, and the Company shall at the time of filing
       either pay to the Commission the filing fee for the Rule 462(b)
       Registration Statement or give irrevocable instructions for the payment
       of such fee pursuant to Rule 111(b) under the Act.

       6.     The Company covenants and agrees with the several Underwriters
that the Company will pay or cause to be paid the following: (i) the fees,
disbursements and expenses of the Company's counsel and accountants in
connection with the registration of the Shares under the Act and all other
expenses in connection with the preparation, printing and filing of the
Registration Statement, any Preliminary Prospectus and the Prospectus and
amendments and supplements thereto and the mailing and delivering of copies
thereof to the Underwriters and dealers; (ii) the cost of printing or producing
any Agreement among Underwriters, this Agreement, the Blue Sky Memorandum, if
any, closing documents (including any compilations thereof) and any other
documents in connection with the offering, purchase, sale and delivery of the
Shares; (iii) all expenses in connection with the qualification of the Shares
for offering and sale under state securities laws as provided in Section 5(b)
hereof, including the fees and disbursements of counsel for the Underwriters in
connection with such qualification and in connection with the Blue Sky survey;
(iv) all fees and expenses in connection with listing the Shares on the NASDAQ;
(v) the filing fees incident to, and the fees and disbursements of counsel for
the Underwriters in connection with, securing any required review by the
National Association of Securities Dealers, Inc. of the terms of the sale of the
Shares; (vi) the cost of preparing stock certificates; (vii) the cost and
charges of any transfer agent or registrar; and (viii) all other costs and
expenses incident to the performance of its obligations hereunder which are not
otherwise specifically provided for in this Section.  It is understood, however,
that, except as provided in this Section, and Sections 8 and 11 hereof, the
Underwriters will pay all of their own costs and expenses, including the fees of
their counsel, stock transfer taxes on resale of any of the Shares by them, and
any advertising expenses connected with any offers they may make.

       7.     The obligations of the Underwriters hereunder, as to the Shares to
be delivered at each Time of Delivery, shall be subject, in their discretion, to
the condition that all representations and warranties and other statements of
the Company herein are, at and as of such Time of Delivery, true and correct,
the condition that the Company shall have performed all of its obligations
hereunder theretofore to be performed, and the following additional conditions:

                                       13

<PAGE>

              (a)    The Prospectus as amended or supplemented in relation to
       the Shares shall have been filed with the Commission pursuant to Rule
       424(b) within the applicable time period prescribed for such filing by
       the rules and regulations under the Act and in accordance with Section
       5(a) hereof; if the Company has elected to rely upon Rule 462(b), the
       Rule 462(b) Registration Statement shall have become effective by 10:00
       P.M., Washington, D.C. time, on the date of this Agreement; no stop order
       suspending the effectiveness of the Registration Statement or any part
       thereof shall have been issued and no proceeding for that purpose shall
       have been initiated or threatened by the Commission; and all requests for
       additional information on the part of the Commission shall have been
       complied with to your reasonable satisfaction;

              (b)    Sullivan & Cromwell, counsel for the Underwriters, shall
       have furnished to you such written opinion or opinions, dated such Time
       of Delivery, with respect to the matters as you may reasonably request,
       and such counsel shall have received such papers and information as they
       may reasonably request to enable them to pass upon such matters;

              (c)    Hale and Dorr, LLP, counsel for the Company, shall have
       furnished to you their written opinion (a draft of such opinion is
       attached as Annex II(c) hereto), dated such Time of Delivery, in form and
       substance satisfactory to you, to the effect that:

                     (i)    The Company has been duly incorporated and is
              validly existing as a corporation in good standing under the laws
              of the State of Delaware with corporate power and authority to own
              its properties and conduct its business as described in the
              Prospectus as amended or supplemented;

                     (ii)   The Company has an authorized capitalization as set
              forth in the Prospectus, and all of the issued and outstanding
              shares of the Company's capital stock have been duly and validly
              authorized and issued and are fully paid and non-assessable;

                     (iii)  The Shares have been duly and validly authorized
              and, when issued and delivered to the Underwriters against payment
              therefor as provided for herein, will be validly issued, fully
              paid and non-assessable; and the Shares conform in all material
              respects to the description of the Company's common stock
              contained in the Prospectus.

                                       14

<PAGE>

                     (iv)   The Company has been duly qualified as a foreign
              corporation for the transaction of business and is in good
              standing as a foreign corporation under the laws of the
              Commonwealth of Massachusetts;

                     (v)    Each United States subsidiary of the Company listed
              in Exhibit 1 to such opinion has been duly organized, is validly
              existing and is in good standing under the laws of its
              jurisdiction of organization;

                     (vi)   To such counsel's knowledge, there are no legal or
              governmental proceedings pending to which the Company or any of
              its subsidiaries is a party or of which any property of the
              Company or any of its subsidiaries is the subject, which
              proceedings are required by the Act or the rules and regulations
              thereunder to be described in the Registration Statement or
              Prospectus as supplemented and that are not so described;

                     (vii)  This Agreement has been duly authorized, executed
              and delivered by the Company;

                     (viii) The issue and sale of the Shares by the Company and
              the compliance by the Company with all of the provisions of this
              Agreement and the consummation by the Company of the transactions
              herein contemplated will not result in any violation of the
              provisions of the Restated Certificate of Incorporation or By-laws
              of the Company or any federal or Massachusetts state statute, rule
              or regulation, or any order known to such counsel of any court or
              governmental agency or body specifically naming the Company or any
              of its subsidiaries or any of their properties;

                     (ix)   No consent, approval, authorization, order,
              registration or qualification of or with any such court or
              governmental agency or body is required for the issue and sale of
              the Shares or the consummation by the Company of the transactions
              contemplated by this Agreement, except (a) the registration under
              the Act of the Shares, and (b) such consents, approvals,
              authorization, registrations or qualifications as may be required
              under (x) state securities or Blue Sky laws or (y) the rules and
              regulations of the National Association of Securities Dealers,
              Inc. in connection with the purchase and distribution of the
              Shares by the Underwriters;

                                       15

<PAGE>

                     (x)    The statements set forth in the Prospectus under the
              caption "Description of Common Stock and Preferred Stock", insofar
              as they purport to constitute a summary of the terms of the
              Company's common stock, and under the captions "Plan of
              Distribution" and "Underwriting", insofar as they purport to
              describe the provisions of the laws and documents referred to
              therein, are accurate and  complete in all material respects;

                     (xi)   The Company is not an "investment company", as such
              term is defined in the Investment Company Act; and

                     (xii)  The Registration Statement and the Prospectus as
              amended or supplemented (other than the financial statements and
              related notes and schedules therein, as to which such counsel need
              express no opinion) comply as to form in all material respects
              with the requirements of the Act and the rules and regulations
              thereunder.

              Such counsel shall also state, without passing upon or assuming
       any responsibility for the accuracy or completeness of the statements
       contained in any of the following documents, except for those referred to
       in the opinion in subsection (ix) of this section 7(c), that nothing has
       come to their attention that has led them to believe (a) that, as of the
       effective date of the Registration Statement, the Registration Statement
       (or as of its date, any amendment or supplement thereto made by the
       Company prior to the date of such opinion) contained any untrue statement
       of a material fact or omitted to state a material fact required to be
       stated therein or necessary to make the statements therein not misleading
       or (b) that, as of its date, the Prospectus as amended or supplemented or
       any further amendment or supplement thereto made by the Company prior to
       the Time of Delivery contained any untrue statement of a material fact or
       omitted to state a material fact required to be stated therein or
       necessary in order to make the statements therein, in the light of the
       circumstances under which they were made, not misleading or (c) that, as
       of the Time of Delivery, the Registration Statement as amended contained
       any untrue statement or a material fact or omitted to state a material
       fact required to be stated therein or necessary to make the statements
       therein not misleading, or (d) that, as of the Time of Delivery, the
       Prospectus as amended or supplemented contained any untrue statement of a
       material fact or omitted to state a material fact required to be stated
       therein or necessary to make the statements therein, in the light of the
       circumstances under which they were made, not misleading.
       Notwithstanding the foregoing, such counsel need express no belief as to
       the financial statements, including the notes and schedules thereto, or
       any financial data set forth or referred to in the Registration Statement
       or the Prospectus as amended or supplemented or the statements in the

                                       16

<PAGE>

       section of the Annual Report on Form 10-K incorporated by reference
       therein captioned "Business-Government Regulation" insofar as such
       statements purport to describe or summarize applicable provisions of the
       Federal Food, Drug and Cosmetic Act and the Clinical Laboratory
       Improvement Amendments of 1988 and the regulations promulgated
       thereunder.

              (d)    John B. Douglas III, General Counsel for the Company, shall
       have furnished to you his written opinion, dated such Time of Delivery,
       in form and substance satisfactory to you, to the effect that:

                     (i)    All of the issued shares of capital stock of each
              subsidiary of the Company have been duly and validly authorized
              and issued, are fully paid and non-assessable, and (except for
              directors' qualifying shares and except as otherwise set forth in
              the Prospectus as amended or supplemented) are owned directly or
              indirectly by the Company, free and clear of all liens,
              encumbrances, equities or claims (such counsel being entitled to
              rely in respect of the opinion in this clause upon opinions of
              local counsel and in respect of matters of fact upon certificates
              of officers of the Company or its subsidiaries, provided that such
              counsel shall state that he believes that you are justified in
              relying upon such opinions and certificates);

                     (ii)   To the best of such counsel's knowledge and other
              than as set forth in the Prospectus as amended or supplemented, or
              in such opinion, there are no legal or governmental proceedings
              pending to which the Company or any of its subsidiaries is a party
              or of which any property of the Company or any of its subsidiaries
              is the subject, which proceedings are required by the Act or the
              rules and regulations thereunder to be described in the
              Registration Statement or Prospectus as supplemented and that are
              not so described;

                     (iii)  The issue and sale of the Shares being delivered at
              such Time of Delivery and the compliance by the Company with all
              of the provisions of this Agreement and the consummation of the
              transactions herein contemplated will not conflict with or result
              in a breach or violation of any of the terms or provisions of, or
              constitute a default under, any indenture, mortgage, deed of
              trust, loan agreement or other agreement or instrument known to
              such counsel (A) to which the Company or any of its subsidiaries
              is a party or (B) by which the Company or any of its subsidiaries
              is bound or (C) to which any of the property or assets of the
              Company or any of its subsidiaries is subject, except where any
              such conflict, breach or violation would not have a Material
              Adverse Effect;

                                       17

<PAGE>

                     (iv)   Each of the Strategic Alliance Agreements is (A) to
              such counsel's knowledge, in full force and effect and (B)
              constitutes a valid and binding agreement between the parties
              thereto, enforceable in accordance with its terms subject to
              bankruptcy, insolvency, reorganization and other laws of general
              applicability relating to or affecting creditors' rights and to
              general equity principles; and the statements in the Annual Report
              (as defined in paragraph (f) below) under the caption "Business --
              Alliances", insofar as they purport to describe the provisions of
              the Strategic Alliance Agreements, are accurate and  complete in
              all material respects;

                     (v)    To the best of such counsel's knowledge, except as
              set forth in such opinion, neither the Company nor any of its
              subsidiaries is in violation of its certificate of incorporation
              or by-laws or in default in the performance or observance of any
              material obligation, covenant or condition contained in any
              indenture, mortgage, deed of trust, loan agreement, lease or other
              agreement or instrument to which it is a party or by which it or
              any of its properties may be bound; and

                     (vi)   The documents incorporated by reference in the
              Prospectus as amended or supplemented (other than the financial
              statements and related notes and schedules therein, as to which
              such counsel need express no opinion), when they became effective
              or were filed with the Commission, as the case may be, complied as
              to form in all material respects with the requirements of the Act
              or the Exchange Act, as applicable, and the rules and regulations
              of the Commission thereunder; and such counsel has no reason to
              believe that any of such documents, when such documents became
              effective or were so filed, as the case may be, contained, in the
              case of a registration statement which became effective under the
              Act, an untrue statement of a material fact or omitted to state a
              material fact required to be stated therein or necessary to make
              the statements therein not misleading, or, in the case of other
              documents which were filed under the Act or the Exchange Act with
              the Commission, an untrue statement of a material fact or omitted
              to state a material fact necessary in order to make the statements
              therein, in the light of the circumstances under which they were
              made when such documents were so filed, not misleading.

              (e)    Scott A. Brown, Chief Patent Counsel of the Company, shall
       have furnished to you his written opinion, dated such Time of Delivery,
       in form and substance satisfactory to you with respect to patent matters
       at the Company and its subsidiaries (the "Millennium Patent Matters"), to
       the effect that:

                                       18

<PAGE>

                     (i)    Such counsel has reviewed the statements in the
              Prospectus, as amended or supplemented, under the section
              captioned "Risk Factors -- Risks Relating to Intellectual
              Property", and in the documents incorporated by reference in the
              Prospectus relating to Millennium Patent Matters and, insofar as
              such statements constitute matters of United States patent law or
              legal conclusions thereunder, such statements are accurate and
              fairly present such matters of law and legal conclusions;

                     (ii)   Such counsel has reviewed the section captioned
              "Risk Factors -- Risks Relating to Intellectual Property"; and
              statements in the Prospectus, as amended or supplemented,
              including the statements in the documents incorporated by
              reference in the Prospectus relating to Millennium Patent Matters,
              and as of the date of the Prospectus, as amended or supplemented,
              and as of such Time of Delivery, such section or statements do not
              contain an untrue statement of material fact regarding United
              States patent matters or omit to state a material fact necessary
              to make the statements therein regarding Millennium Patent
              Matters, in light of the circumstances in which they were made,
              not misleading;

                     (iii)  To the best of such counsel's knowledge, except as
              set forth in such opinion, each of the patents and patent
              applications referenced in the Prospectus, as amended or
              supplemented, as being owned by the Company is owned by, and
              assigned, of record in the United States Patent and Trademark
              Office (the "USPTO"), to the Company;

                     (iv)   To the best of such counsel's knowledge, except as
              set forth in such opinion, no liens or other encumbrances have
              been recorded against the patents or patent applications of the
              Company;

                     (v)    Although there can be no guarantee that any
              particular patent application will issue as a patent, each of the
              United States patent applications of the Company was properly
              filed in, and, is being properly prosecuted before, the USPTO;

                     (vi)   To the best of such counsel's knowledge, except as
              set forth in such opinion, for each patent and patent application
              of the Company, all information known, to date, to be "material to
              patentability" as defined in 37 C.F.R. Section 1.56(b), has been
              disclosed, or will be disclosed, if required pursuant to 37 C.F.R.
              Section 1.97, to the USPTO;

                                       19

<PAGE>

                     (vii)  Except as set forth in such opinion, each of the
              Company's United States patent applications recites patentable
              subject matter;

                     (viii) To the best of such counsel's knowledge, except as
              set forth in such opinion, no third party has any rights to any of
              the Company's United States patents or patent applications;

                     (ix)   To the best of such counsel's knowledge, except as
              set forth in such opinion, no interference has been threatened,
              declared or provoked, or is being provoked with respect to any of
              the Company's United States patents or patent applications;

                     (x)    To the best of such counsel's knowledge, except as
              set forth in such opinion, there have been no inventorship
              challenges with respect to any of the Company's United States
              patents or patent applications;

                     (xi)   To the best of such counsel's knowledge, except as
              set forth in such opinion, none of the Company's patents is the
              subject of a reexamination or reissue proceeding in the USPTO;

                     (xii)  To the best of such counsel's knowledge, except as
              set forth in such opinion, the Company has not received any notice
              challenging the Company's rights to any of its United States
              patents or with respect to any of the Company's patent
              applications;

                     (xiii) To the best of such counsel's knowledge, except as
              set forth in such opinion, the Company has not received any
              communication or notice, written or oral, relating to the
              potential infringement of, or conflict with, any patents,
              trademarks, copyrights, trade secrets, or proprietary rights of
              others;

                     (xiv)  To the best of such counsel's knowledge, except as
              set forth in such opinion and the Prospectus, no issued United
              States patents would be infringed by the Company's manufacture,
              use, sale, offer for sale or importation of any of the Company's
              present clinical products or processes; and

                     (xv)   To the best of such counsel's knowledge, except as
              set forth in such opinion no third party is infringing any of the
              Company's patents other than such infringements as do not,
              individually or in the aggregate, have a Material Adverse Effect.

                                       20

<PAGE>

              (f)    Covington and Burling, Special Regulatory Counsel to the
       Company, shall have furnished to you a written opinion, dated such Time
       of Delivery, in form and substance satisfactory to you, to the effect
       that such counsel has reviewed the Prospectus, as amended or
       supplemented, and in particular the section captioned "Business -
       Government Regulation" contained in the Company's 1999 Annual Report on
       Form 10-K incorporated therein by reference (the "Annual Report"), and
       that insofar as the statements contained therein purport to describe or
       summarize applicable provisions of the Federal Food, Drug and Cosmetic
       Act ("FDCA") and the Clinical Laboratory Improvement Amendments of 1988
       ("CLIA") and the regulations promulgated thereunder, are accurate in all
       material respects and fairly present the information purported to be
       described therein, and based upon the description of the Company's
       business contained in the section captioned "Business - Government
       Regulation" of the Annual Report, such statements summarize the
       provisions of the FDCA and CLIA that are material to the Company's
       business.

              (g)    On the date of this Agreement at a time prior to the
       execution of this Agreement, at 9:30 a.m., New York City time, on the
       effective date of any post-effective amendment to the Registration
       Statement filed subsequent to the date of this Agreement and also at each
       Time of Delivery, Ernst & Young, LLP, Price Waterhouse Coopers LLP, and
       Arthur Andersen LLP shall have furnished to you a letter or letters,
       dated the respective dates of delivery thereof, in form and substance
       satisfactory to you, to the effect set forth in Annex I hereto, to the
       extent applicable;

              (h)  The Company and its subsidiaries (taken as a whole) shall not
       have sustained since the date of the latest audited financial statements
       included or incorporated by reference in the Prospectus any loss or
       interference with its business from fire, explosion, flood or other
       calamity, whether or not covered by insurance, or from any labor dispute
       or court or governmental action, order or decree, otherwise than as set
       forth or contemplated in the Prospectus as amended prior to the date
       hereof, and (ii) since the respective dates as of which information is
       given in the Prospectus as amended prior to the date hereof there shall
       not have been any change in the capital stock or increase or material
       decrease in the long-term debt (including obligations under capital
       leases, but excluding stock option grants in the ordinary course of
       business pursuant to the Company's current stock option plans and any
       exercise of outstanding stock options or warrants or conversion of
       outstanding convertible securities) of the Company or any of its
       subsidiaries or any change, or any development involving a prospective
       change, in or affecting the general affairs, management, financial
       position, stockholders' equity or results of operations of the Company
       and its subsidiaries (taken as a whole), otherwise than as set forth or
       contemplated in the Prospectus as amended prior to the date hereof, the
       effect of which, in any such case described in clause (i) or (ii), is in
       the judgment of the

                                       21

<PAGE>

       Representatives so material and adverse as to make it impracticable or
       inadvisable to proceed with the public offering or the delivery of the
       Shares being delivered at such Time of Delivery on the terms and in the
       manner contemplated in the Prospectus as first amended or supplemented
       relating to the Shares;

              (i)    On or after the date hereof (i) no downgrading shall have
       occurred in the rating accorded the Company's debt securities by any
       "nationally recognized statistical rating organization", as that term is
       defined by the Commission for purposes of Rule 436(g)(2) under the Act,
       and (ii) no such organization shall have publicly announced that it has
       under surveillance or review, with possible negative implications, its
       rating of any of the Company's debt securities;

              (j)    On or after the date hereof there shall not have occurred
       any of the following: (i) a suspension or material limitation in trading
       in securities generally on the New York Stock Exchange or on NASDAQ; (ii)
       a suspension or material limitation in trading in the Company's
       securities on NASDAQ; (iii) a general moratorium on commercial banking
       activities declared by either Federal or New York or Massachusetts state
       authorities; or (iv) the outbreak or escalation of hostilities involving
       the United States or the declaration by the United States of a national
       emergency or war, if the effect of any such event specified in this
       clause (iv) in the judgment of the Representatives makes it impracticable
       or inadvisable to proceed with the public offering or the delivery of the
       Shares being delivered at such Time of Delivery on the terms and in the
       manner contemplated in the Prospectus as first amended or supplemented
       relating to the Shares;

              (k)    The Shares to be sold at such Time of Delivery shall have
       been duly listed for quotation on NASDAQ;

              (l)    The Company shall have obtained and delivered to the
       Underwriters executed copies of an agreement from the persons listed on
       Schedule II, substantially to the effect set forth in Annex II hereof in
       form and substance satisfactory to you;

              (m)    The Company shall have complied with the provisions of
       Section 5(c) hereof with respect to the furnishing of prospectuses on the
       New York Business Day next succeeding the date of this Agreement; and

              (n)    Each Lock-up Agreement shall have been duly executed and
       delivered to you, and there shall have occurred no breach of any Lock-up
       Agreement; and

              (o)    The Company shall have furnished or caused to be furnished
       to you at such Time of Delivery certificates of officers of the Company,
       on behalf of the

                                       22

<PAGE>

       Company, satisfactory to you as to the accuracy of the representations
       and warranties of the Company herein at and as of such Time of
       Delivery, as to the performance by the Company of all of its
       obligations hereunder to be performed at or prior to such Time of
       Delivery, as to the matters set forth in subsections (a) and (h) of this
       Section and as to such other matters as you may reasonably request.

       8.    (a) The Company will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, any preliminary prospectus supplement, the Registration
Statement, the Prospectus  as amended or supplemented or any other prospectus
relating to the Shares, or any amendment or supplement thereto, or arise out
of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the
statements therein not misleading, and will reimburse each Underwriter for
any legal or other expenses reasonably incurred by such Underwriter in
connection with investigating or defending any such action or claim as such
expenses are incurred; PROVIDED, HOWEVER, that the Company shall not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon an untrue statement or alleged
untrue statement or omission or alleged omission made in any Preliminary
Prospectus, any preliminary prospectus supplement, the Registration
Statement, the Prospectus as amended or supplemented and any other prospectus
relating to the Shares or any such amendment or supplement in reliance upon
and in conformity with written information furnished to the Company by any
Underwriter through Goldman, Sachs & Co. or Morgan Stanley & Co. Incorporated
expressly for use in the Prospectus as amended or supplemented relating to
such Shares.

              (b)    Each Underwriter will indemnify and hold harmless the
       Company against any losses, claims, damages or liabilities to which the
       Company may become subject, under the Act or otherwise, insofar as such
       losses, claims, damages or liabilities (or actions in respect thereof)
       arise out of or are based upon an untrue statement or alleged untrue
       statement of a material fact contained in any Preliminary Prospectus, any
       preliminary prospectus supplement, the Registration Statement, the
       Prospectus as amended or supplemented and any other prospectus relating
       to the Shares or any amendment or supplement thereto, or arise out of or
       are based upon the omission or alleged omission to state therein a
       material fact required to be stated therein or necessary to make the
       statements therein not misleading, in each case to the extent, but only
       to the extent, that such untrue statement or alleged untrue statement or
       omission or alleged omission was made in any Preliminary Prospectus, any
       preliminary prospectus supplement, the Registration Statement, the
       Prospectus as amended or supplemented and any other prospectus relating
       to the Shares or any

                                       23

<PAGE>

       such amendment or supplement in reliance upon and in conformity with
       written information furnished to the Company by such Underwriter through
       Goldman, Sachs & Co. or Morgan Stanley & Co. Incorporated expressly for
       use therein; and will reimburse the Company for any legal or other
       expenses reasonably incurred by the Company in connection with
       investigating or defending any such action or claim as such expenses
       are incurred.

              (c)    Promptly after receipt by an indemnified party under
       subsection (a) or (b) above of notice of the commencement of any action,
       such indemnified party shall, if a claim in respect thereof is to be made
       against the indemnifying party under such subsection, notify the
       indemnifying party in writing of the commencement thereof; but the
       omission so to notify the indemnifying party shall not relieve it from
       any liability which it may have to any indemnified party otherwise than
       under such subsection.  In case any such action shall be brought against
       any indemnified party and it shall notify the indemnifying party of the
       commencement thereof, the indemnifying party shall be entitled to
       participate therein and, to the extent that it shall wish, jointly with
       any other indemnifying party similarly notified, to assume the defense
       thereof, with counsel satisfactory to such indemnified party (who shall
       not, except with the consent of the indemnified party, be counsel to the
       indemnifying party), and, after notice from the indemnifying party to
       such indemnified party of its election so to assume the defense thereof,
       the indemnifying party shall not be liable to such indemnified party
       under such subsection for any legal expenses of other counsel or any
       other expenses, in each case subsequently incurred by such indemnified
       party, in connection with the defense thereof other than reasonable costs
       of investigation.  No indemnifying party shall, without the written
       consent of the indemnified party, effect the settlement or compromise of,
       or consent to the entry of any judgment with respect to, any pending or
       threatened action or claim in respect of which indemnification or
       contribution may be sought hereunder (whether or not the indemnified
       party is an actual or potential party to such action or claim) unless
       such settlement, compromise or judgment (i) includes an unconditional
       release of the indemnified party from all liability arising out of such
       action or claim and (ii) does not include a statement as to or an
       admission of fault, culpability or a failure to act, by or on behalf of
       any indemnified party.  No indemnifying party shall be required to
       indemnify an indemnified party for any amount paid or payable by such
       indemnified party in the settlement of any action, proceeding or
       investigation without the written consent of the indemnifying party,
       which consent shall not be unreasonably withheld.

              (d)    If the indemnification provided for in this Section 8 is
       unavailable to or insufficient to hold harmless an indemnified party
       under subsection (a) or (b) above in respect of any losses, claims,
       damages or liabilities (or actions in respect

                                       24

<PAGE>

       thereof) referred to therein, then each indemnifying party shall
       contribute to the amount paid or payable by such indemnified party
       as a result of such losses, claims, damages or liabilities (or actions
       in respect thereof) in such proportion as is appropriate to reflect the
       relative benefits received by the Company on the one hand and the
       Underwriters on the other from the offering of the Shares.  If, however,
       the allocation provided by the immediately preceding sentence is not
       permitted by applicable law or if the indemnified party failed to give
       the notice required under subsection (c) above, then each indemnifying
       party shall contribute to such amount paid or payable by such
       indemnified party in such proportion as is appropriate to reflect not
       only such relative benefits but also the relative fault of the Company
       on the one hand and the Underwriters on the other in connection with
       the statements or omissions which resulted in such losses, claims,
       damages or liabilities (or actions in respect thereof), as well as any
       other relevant equitable considerations.  The relative benefits received
       by the Company on the one hand and the Underwriters on the other shall
       be deemed to be in the same proportion as the total net proceeds from
       the offering (before deducting expenses) received by the Company bear
       to the total underwriting discounts and commissions received by the
       Underwriters, in each case as set forth in the table on the cover page
       of the Prospectus.  The relative fault shall be determined by reference
       to, among other things, whether the untrue or alleged untrue statement
       of a material fact or the omission or alleged omission to state a
       material fact relates to information supplied by the Company on the one
       hand or the Underwriters on the other and the parties' relative intent,
       knowledge, access to information and opportunity to correct or prevent
       such statement or omission.  The Company and the Underwriters agree
       that it would not be just and equitable if contributions pursuant to
       this subsection (d) were determined by PRO RATA allocation (even if the
       Underwriters were treated as one entity for such purpose) or by any
       other method of allocation which does not take account of the equitable
       considerations referred to above in this subsection (d). The amount paid
       or payable by an indemnified party as a result of the losses, claims,
       damages or liabilities (or actions in respect thereof) referred to above
       in this subsection (d) shall be deemed to include any legal or other
       expenses reasonably incurred by such indemnified party in connection
       with investigating or defending any such action or claim.
       Notwithstanding the provisions of this subsection (d), no Underwriter
       shall be required to contribute any amount in excess of the amount by
       which the total price at which the Shares underwritten by it and
       distributed to the public were offered to the public exceeds the amount
       of any damages which such Underwriter has otherwise been required to pay
       by reason of such untrue or alleged untrue statement or omission or
       alleged omission.  No person guilty of fraudulent misrepresentation
       (within the meaning of Section 11(f) of the Act) shall be entitled to
       contribution from any person who was not guilty of such fraudulent
       misrepresentation.  The Underwriters'

                                       25

<PAGE>

       obligations in this subsection (d) to contribute are several in
       proportion to their respective underwriting obligations and not joint.

              (e)    The obligations of the Company under this Section 8 shall
       be in addition to any liability which the Company may otherwise have and
       shall extend, upon the same terms and conditions, to each person, if any,
       who controls any Underwriter within the meaning of the Act; and the
       obligations of the Underwriters under this Section 8 shall be in addition
       to any liability which the respective Underwriters may otherwise have and
       shall extend, upon the same terms and conditions, to each officer and
       director of the Company and to each person, if any, who controls the
       Company within the meaning of the Act.

       9.     (a) If any Underwriter shall default in its obligation to
purchase the Shares which it has agreed to purchase hereunder at a Time of
Delivery, you may in your discretion arrange for you or another party or
other parties to purchase such Shares on the terms contained herein.  If
within thirty-six hours after such default by any Underwriter you do not
arrange for the purchase of such Shares, then the Company shall be entitled
to a further period of thirty-six hours within which to procure another party
or other parties satisfactory to you to purchase such Shares on such terms.
In the event that, within the respective prescribed periods, you notify the
Company that you have so arranged for the purchase of such Shares, or the
Company notifies you that it has so arranged for the purchase of such Shares,
you or the Company shall have the right to postpone Time of Delivery for a
period of not more than seven days, in order to effect whatever changes may
thereby be made necessary in the Registration Statement or the Prospectus, or
in any other documents or arrangements, and the Company agrees to file
promptly any amendments to the Registration Statement or the Prospectus which
in your opinion may thereby be made necessary.  The term "Underwriter" as
used in this Agreement shall include any person substituted under this
Section with like effect as if such person had originally been a party to
this Agreement with respect to such Shares.

              (b)    If, after giving effect to any arrangements for the
       purchase of the Shares of a defaulting Underwriter or Underwriters by you
       and the Company as provided in subsection (a) above, the aggregate number
       of such Shares which remains unpurchased does not exceed one-eleventh of
       the aggregate number of all the Shares to be purchased at such Time of
       Delivery, then the Company shall have the right to require each
       non-defaulting Underwriter to purchase the number of shares which such
       Underwriter agreed to purchase hereunder at such Time of Delivery and, in
       addition, to require each non-defaulting Underwriter to purchase its PRO
       RATA share (based on the number of Shares which such Underwriter agreed
       to purchase hereunder) of the Shares of such defaulting Underwriter or
       Underwriters for which

                                       26

<PAGE>

       such arrangements have not been made; but nothing herein shall relieve
       a defaulting Underwriter from liability for its default.

              (c)    If, after giving effect to any arrangements for the
       purchase of the Shares of a defaulting Underwriter or Underwriters by you
       and the Company as provided in subsection (a) above, the aggregate number
       of such Shares which remains unpurchased exceeds one-eleventh of the
       aggregate number of all the Shares to be purchased at such Time of
       Delivery, or if the Company shall not exercise the right described in
       subsection (b) above to require non-defaulting Underwriters to purchase
       Shares of a defaulting Underwriter or Underwriters, then this Agreement
       (or, with respect to the Second Time of Delivery, the obligations of the
       Underwriters to purchase and of the Company to sell the Optional Shares)
       shall thereupon terminate, without liability on the part of any
       non-defaulting Underwriter or the Company, except for the expenses to be
       borne by the Company and the Underwriters as provided in Section 6 hereof
       and the indemnity and contribution agreements in Section 8 hereof; but
       nothing herein shall relieve a defaulting Underwriter from liability for
       its default.

       10.    The respective indemnities, agreements, representations,
warranties and other statements of the Company and the several Underwriters,
as set forth in this Agreement or made by or on behalf of them, respectively,
pursuant to this Agreement, shall remain in full force and effect, regardless
of any investigation (or any statement as to the results thereof) made by or
on behalf of any Underwriter or any controlling person of any Underwriter, or
the Company, or any officer or director or controlling person of the Company,
and shall survive delivery of and payment for the Shares.

       11.    If this Agreement shall be terminated pursuant to Section 9
hereof, the Company shall not then be under any liability to any Underwriter
except as provided in Sections 6 and 8 hereof; but, if for any other reason,
any Shares are not delivered by or on behalf of the Company as provided
herein, the Company will reimburse the Underwriters through you for all
out-of-pocket expenses approved in writing by you, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Shares not so
delivered, but the Company shall then be under no further liability to any
Underwriter except as provided in Sections 6 and 8 hereof.

       12.    In all dealings hereunder, you shall act on behalf of each of
the Underwriters, and the parties hereto shall be entitled to act and rely
upon any statement, request, notice or agreement on behalf of any Underwriter
made or given by you jointly or by Goldman, Sachs & Co. or Morgan Stanley &
Co. Incorporated on behalf of you as the representatives.  It is understood
and agreed that Goldman, Sachs & Co. and Morgan Stanley & Co. Incorporated

                                       27

<PAGE>
are joint book runners for the offering and any determinations or other
actions to be made under this Agreement by you or by the Representatives
shall require the concurrence of both Goldman, Sachs & Co. and Morgan Stanley
& Co. Incorporated.

       All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex
or facsimile transmission to you as the representatives in care of Goldman,
Sachs & Co., 32 Old Slip, 21st Floor, New York, New York 10005, Attention:
Registration Department and Morgan Stanley & Co. Incorporated, 1585 Broadway,
New York, New York 10036, Attention: Equity Capital Markets Syndicate Desk;
and if to the Company shall be delivered or sent by mail, telex or facsimile
transmission to the address of the Company set forth in the Registration
Statement, Attention: General Counsel, with a copy to David E. Redlick, Esq.,
Hale and Dorr LLP, 60 State Street, Boston MA 02109; provided, however, that
any notice to an Underwriter pursuant to Section 8(c) hereof shall be
delivered or sent by mail, telex or facsimile transmission to such
Underwriter at its address set forth in its Underwriters' Questionnaire, or
telex constituting such Questionnaire, which address will be supplied to the
Company by you upon request.  Any such statements, requests, notices or
agreements shall take effect upon receipt thereof.

       13.    This Agreement shall be binding upon, and inure solely to the
benefit of, the Underwriters, the Company and, to the extent provided in
Sections 8 and 10 hereof, the officers and directors of the Company and each
person who controls the Company or any Underwriter, and their respective
heirs, executors, administrators, successors and assigns, and no other person
shall acquire or have any right under or by virtue of this Agreement.  No
purchaser of any of the Shares from any Underwriter shall be deemed a
successor or assign by reason merely of such purchase.

       14.    Time shall be of the essence of this Agreement.  As used
herein, the term "business day" shall mean any day when the Commission's
office in Washington, D.C. is open for business.

       15.    THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK.

       16.    This Agreement may be executed by any one or more of the
parties hereto in any number of counterparts, each of which shall be deemed
to be an original, but all such counterparts shall together constitute one
and the same instrument.

                                       28

<PAGE>

       If the foregoing is in accordance with your understanding, please sign
and return to us one for the Company and each of the Representatives plus one
for each counsel counterparts hereof, and upon the acceptance hereof by you,
on behalf of each of the Underwriters, this letter and such acceptance hereof
shall constitute a binding agreement between each of the Underwriters and the
Company. It is understood that your acceptance of this letter on behalf of
each of the Underwriters is pursuant to the authority set forth in a form of
Agreement among Underwriters, the form of which shall be submitted to the
Company for examination upon request, but without warranty on your part as to
the authority of the signers thereof.

                                          Very truly yours,

                                          Millennium Pharmaceuticals, Inc.

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

Accepted as of the date hereof:

Goldman, Sachs & Co.,
Morgan Stanley & Co. Incorporated,
Robertson Stephens, Inc.,
Credit Suisse First Boston Corporation


By: /s/ Goldman, Sachs & Co.
   --------------------------------------------
            (Goldman, Sachs & Co.)

By: /s/ John J. Moore, Jr.
  ---------------------------------------------
            (Morgan Stanley & Co. Incorporated)


On behalf of each of the Underwriters

                                       29

<PAGE>

                                 SCHEDULE I

<TABLE>
<CAPTION>
                                                                   NUMBER OF
                                                                OPTIONAL SHARES
                                             TOTAL NUMBER OF     TO BE PURCHASED
                                            FIRM SHARES TO BE   IF MAXIMUM OPTION
                 UNDERWRITER                    PURCHASED           EXERCISED
                 -----------                -----------------   -----------------
 <S>                                          <C>                  <C>
 Goldman, Sachs & Co. ....................       3,850,000            577,500
 Morgan Stanley & Co. Incorporated .......       3,850,000            577,500
 Robertson Stephens, Inc. ................       2,200,000            330,000
 Credit Suisse First Boston Corporation ..       1,100,000            165,000

                                                ----------          ---------
        Total ............................      11,000,000          1,650,000
                                                ==========          =========
</TABLE>

<PAGE>
                               SCHEDULE II

                            Mark J. Levin
                            John B. Douglas III
                            Kenneth J. Conway
                            Steven H. Holtzman
                            John Maraganore, Ph.D
                            Linda K. Pine
                            Kevin P. Starr
                            Robert I. Tepper, M.D.
                            Susan Ward
                            Joshua Boger, Ph.D
                            Eugene Cordes, Ph.D
                            A. Grant Heidrich, III
                            Raju S. Kucherlapati, Ph.D
                            Eric S. Lander, Ph.D
                            Norman C. Selby

<PAGE>

                                     SCHEDULE III

                            STRATEGIC ALLIANCE AGREEMENTS

       1.     Collaboration and License Agreement by and between Millennium
Pharmacueticals, Inc. and Aventis Pharmaceuticals, Inc. dated as of June 22,
2000.

       2.     Collaboration Agreement by and between Company and Abgenix, Inc.,
dated July 6, 2000.

       3.     Letter of Intent Regarding License of LDP-977 between Millennium
Pharmacueticals and Taisho Pharmaceutical Co., LTD., dated January 6, 2000.

       4.     Distribution and Development Agreement by and between L & I
Partners, L.P. and Schering AG, dated August 24, 1999.

       5.     Supply Agreement (on CAMPATH-1H) by and between L & I Partners,
L.P. and Boehringer Ingelheim Pharma KG, dated June 4, 1999.

       6.     Collaboration and License Agreement by and between Becton,
Dickinson and Company and MPMx, dated February 21, 1999.

       7.     Agreement by and between Bayer AG and Millennium Pharmaceuticals,
Inc., dated September 22, 1998.

       8.     Development, Collaboration and License Agreement by and between
Genentech, Inc. and Leukosite, Inc., dated December 1997.

       9.     Agreement by and between Millennium Pharmaceuticals, Inc.,
Monsanto Company and Cereon Genomics Inc. (formerly Monsanto Agricultural
Genomics II LLC), dated October 27, 1997.

       10.    Sponsored Research Agreement among Whitehead Institute for
Biomedical Research, Affymetrix, Inc., Bristol-Myers Squibb Company and
Millennium Pharmaceuticals, Inc., dated April 28, 1997.

       11.    Consortium Member Agreement among Affymetrix, Inc., Bristol-Myers
Squibb Company and Millennium Pharmaceuticals, Inc., dated April 28, 1997.

       12.    License Agreement by and between L&I Partners, L.P. and Leukosite,
Inc., dated May 2, 1997.

       13.    CNS Research, Collaboration and License Agreement by and between
American Home Products Corporation and Millennium Pharmaceuticals, Inc., dated
August 1, 1996.

<PAGE>

                                                                   ANNEX I

       Pursuant to Section 7(g) of the Underwriting Agreement, the accountants
shall furnish letters to the Underwriters to the effect that:

              (i)    They are independent certified public accountants with
       respect to the Company and its subsidiaries within the meaning of the Act
       and the applicable published rules and regulations thereunder;

              (ii)   In their opinion, the financial statements and any
       supplementary financial information and schedules (and, if applicable,
       financial forecasts and/or pro forma financial information) examined by
       them and included or incorporated by reference in the Registration
       Statement or the Prospectus comply as to form in all material respects
       with the applicable accounting requirements of the Act or the Exchange
       Act, as applicable, and the related published rules and regulations
       thereunder; and, if applicable, they have made a review in accordance
       with standards established by the American Institute of Certified Public
       Accountants of the consolidated interim financial statements, selected
       financial data, pro forma financial information, financial forecasts
       and/or condensed financial statements derived from audited financial
       statements of the Company for the periods specified in such letter, as
       indicated in their reports thereon, copies of which have been separately
       furnished to the Underwriters;

              (iii)  They have made a review in accordance with standards
       established by the American Institute of Certified Public Accountants of
       the unaudited condensed consolidated statements of income, consolidated
       balance sheets and consolidated statements of cash flows included in the
       Prospectus and/or included in the Company's quarterly report on Form 10-Q
       incorporated by reference into the Prospectus as indicated in their
       reports thereon copies of which have been separately furnished to the
       Underwriters and on the basis of specified procedures including inquiries
       of officials of the Company who have responsibility for financial and
       accounting matters regarding whether the unaudited condensed consolidated
       financial statements referred to in paragraph (vi)(A)(i) below comply as
       to form in the related in all material respects with the applicable
       accounting requirements of the Act and the Exchange Act and the related
       published rules and regulations, nothing came to their attention that
       caused them to believe that the unaudited condensed consolidated
       financial statements do not comply as to form in all material respects
       with the applicable accounting requirements of the Act and the Exchange
       Act and the related published rules and regulations;

                                       1

<PAGE>

              (iv)   The unaudited selected financial information with respect
       to the consolidated results of operations and financial position of the
       Company for the five most recent fiscal years included in the Prospectus
       and included or incorporated by reference in Item 6 of the Company's
       Annual Report on Form 10-K for the most recent fiscal year agrees with
       the corresponding amounts (after restatement where applicable) in the
       audited consolidated financial statements for such five fiscal years
       which were included or incorporated by reference in the Company's Annual
       Reports on Form 10-K for such fiscal years;

              (v)    They have compared the information in the Prospectus under
       selected captions with the disclosure requirements of Regulation S-K and
       on the basis of limited procedures specified in such letter nothing came
       to their attention as a result of the foregoing procedures that caused
       them to believe that this information does not conform in all material
       respects with the disclosure requirements of Items 301, 302, 402 and
       503(d), respectively, of Regulation S-K;

              (vi)   On the basis of limited procedures, not constituting an
       examination in accordance with generally accepted auditing standards,
       consisting of a reading of the unaudited financial statements and other
       information referred to below, a reading of the latest available interim
       financial statements of the Company and its subsidiaries, inspection of
       the minute books of the Company and its subsidiaries since the date of
       the latest audited financial statements included or incorporated by
       reference in the Prospectus, inquiries of officials of the Company and
       its subsidiaries responsible for financial and accounting matters and
       such other inquiries and procedures as may be specified in such letter,
       nothing came to their attention that caused them to believe that:

                            (A)    (i) the unaudited condensed consolidated
                     statements of income, consolidated balance sheets and
                     consolidated statements of cash flows included in the
                     Prospectus and/or included or incorporated by reference in
                     the Company's Quarterly Reports on Form 10-Q incorporated
                     by reference in the Prospectus do not comply as to form in
                     all material respects with the applicable accounting
                     requirements of the Exchange Act and the related published
                     rules and regulations, or (ii) any material modifications
                     should be made to the unaudited condensed consolidated
                     statements of income, consolidated balance sheets and
                     consolidated statements of cash flows included in the
                     Prospectus or included in the Company's Quarterly Reports
                     on Form 10-Q incorporated by reference in the Prospectus,
                     for them to be in conformity with generally accepted
                     accounting principles;

                                       2

<PAGE>

                            (B)    any other unaudited income statement data and
                     balance sheet items included in the Prospectus do not agree
                     with the corresponding items in the unaudited consolidated
                     financial statements from which such data and items were
                     derived, and any such unaudited data and items were not
                     determined on a basis substantially consistent with the
                     basis for the corresponding amounts in the audited
                     consolidated financial statements included or incorporated
                     by reference in the Company's Annual Report on Form 10-K
                     for the most recent fiscal year;

                            (C)    the unaudited financial statements which were
                     not included in the Prospectus but from which were derived
                     the unaudited condensed financial statements referred to in
                     clause (A) and any unaudited income statement data and
                     balance sheet items included in the Prospectus and referred
                     to in clause (B) were not determined on a basis
                     substantially consistent with the basis for the audited
                     financial statements included or incorporated by reference
                     in the Company's Annual Report on Form 10-K for the most
                     recent fiscal year;

                            (D)    any unaudited pro forma consolidated
                     condensed financial statements included or incorporated by
                     reference in the Prospectus do not comply as to form in all
                     material respects with the applicable accounting
                     requirements of the Act and the published rules and
                     regulations thereunder or the pro forma adjustments have
                     not been properly applied to the historical amounts in the
                     compilation of those statements;

                            (E)    as of a specified date not more than five
                     days prior to the date of such letter, there have been any
                     changes in the consolidated capital stock (other than
                     issuances of capital stock upon exercise of options and
                     stock appreciation rights, upon earn-outs of performance
                     shares and upon conversions of convertible securities, in
                     each case which were outstanding on the date of the latest
                     balance sheet included or incorporated by reference in the
                     Prospectus) or any increase in the consolidated long-term
                     debt of the Company and its subsidiaries, or any decreases
                     in consolidated net current assets or stockholders' equity
                     or other items specified by the underwriters, or any
                     increases in any items specified by the Underwriters, in
                     each case as compared with amounts shown in the latest
                     balance sheet included or incorporated by reference in the
                     Prospectus, except in each case for changes, increases or
                     decreases which the Prospectus discloses have occurred or
                     may occur or which are described in such letter; and

                                       3

<PAGE>

                            (F)    for the period from the date of the latest
                     financial statements included or incorporated by reference
                     in the Prospectus to the specified date referred to in
                     clause (E) there were any decreases in consolidated net
                     revenues or operating profit or the total or per share
                     amounts of consolidated net income or other items specified
                     by the Underwriters, or any increases in any items
                     specified by the Underwriters, in each case as compared
                     with the comparable period of the preceding year and with
                     any other period of corresponding length specified by the
                     Underwriters, except in each case for increases or
                     decreases which the Prospectus discloses have occurred or
                     may occur or which are described in such letter; and

              (vii)  In addition to the examination referred to in their
       report(s) included or incorporated by reference in the Prospectus and the
       limited procedures, inspection of minute books, inquiries and other
       procedures referred to in paragraphs (iii) and (vi) above, they have
       carried out certain specified procedures, not constituting an examination
       in accordance with generally accepted auditing standards, with respect to
       certain amounts, percentages and financial information specified by the
       Underwriters which are derived from the general accounting records of the
       Company and its subsidiaries, which appear in the Prospectus (excluding
       documents incorporated by reference) or in Part II of, or in exhibits and
       schedules to, the Registration Statement specified by the Underwriters or
       in documents incorporated by reference in the Prospectus specified by the
       Underwriters, and have compared certain of such amounts, percentages and
       financial information with the accounting records of the Company and its
       subsidiaries and have found them to be in agreement.

                                       4

<PAGE>

                                                                   ANNEX II

                            FORM OF LOCK-UP AGREEMENT

                          MILLENNIUM PHARMACEUTICALS INC.

                                 LOCK-UP AGREEMENT

                                SEPTEMBER  __, 2000

Goldman, Sachs & Co.
Morgan Stanley & Co. Incorporated
Credit Suisse First Boston Corporation
Robertson Stephens, Inc.
c/o Goldman, Sachs & Co.
85 Broad Street
New York, NY  10004

       Re: MILLENNIUM PHARMACEUTICALS - LOCK-UP AGREEMENT

Ladies and Gentlemen:

       The undersigned understands that you (collectively, the
"Underwriters") propose to enter into an Underwriting Agreement with
Millennium Pharmaceuticals, Inc., a Delaware corporation (the "Company"),
providing for a public offering of Shares of Common Stock, par value $0.001
(the "Shares") pursuant to the Company's effective shelf registration (File
No. 333-42770) filed with the Securities and Exchange Commission (the "SEC").

       In consideration of the agreement by the Underwriters to offer and
sell the Shares, and of other good and valuable consideration the receipt and
sufficiency of which is hereby acknowledged, the undersigned agrees that,
during the period beginning from the date of the final prospectus supplement
covering the offering of the Shares and continuing to and including the date
90 days after the date of such final prospectus supplement (the "Lock-up
Period"), the undersigned will not offer, sell, contract to sell, pledge,
grant any option to purchase, make any short sale or otherwise dispose of any
Common Stock, or any options or warrants to purchase any Common Stock, or any
securities convertible into, exchangeable for or that represent the right to
receive Common Stock, whether now owned or hereinafter acquired, owned
directly by the undersigned (including holding as a custodian) or with
respect to which the undersigned has beneficial ownership within the rules
and regulations of the SEC (collectively the "Undersigned's Shares").

       The foregoing restriction is expressly agreed to preclude the
undersigned from engaging in any hedging or other transaction which is
designed to or which reasonably could be expected to lead to or result in a
sale or disposition of the Undersigned's Shares even if such shares would be
disposed of by someone other than the undersigned.  Such prohibited

                                       1

<PAGE>

hedging or other transactions would include without limitation any short sale
or any purchase, sale or grant of any right (including without limitation any
put or call option) with respect to any of the Undersigned's Shares or with
respect to any security that includes, relates to, or derives any significant
part of its value from such shares.

       Notwithstanding the foregoing, the undersigned may transfer the
Undersigned's Shares (i) as a BONA FIDE gift or gifts, provided that the
donee or donees thereof agree to be bound in writing by the restrictions set
forth herein, (ii) to any trust for the direct or indirect benefit of the
undersigned or the immediate family of the undersigned, provided that the
trustee of the trust agrees to be bound in writing by the restrictions set
forth herein, and provided further that any such transfer shall not involve a
disposition for value, (iii) as a distribution to limited partners or
stockholders of the undersigned, provided that such distributees agree in
writing to be bound by the restrictions set forth herein, or (iv) with the
prior written consent of Goldman, Sachs & Co. and Morgan Stanley and Co.
Incorporated on behalf of the Underwriters.  For purposes of this Lock-Up
Agreement, "immediate family" shall mean any relationship by blood, marriage
or adoption, not more remote than first cousin.  In addition, notwithstanding
the foregoing, if the undersigned is a corporation, the corporation may
transfer the capital stock of the Company to any wholly-owned subsidiary of
such corporation; PROVIDED, HOWEVER, that in any such case, it shall be a
condition to the transfer that the transferee execute an agreement stating
that the transferee is receiving and holding such capital stock subject to
the provisions of this Agreement and there shall be no further transfer of
such capital stock except in accordance with this Agreement, and provided
further that any such transfer shall not involve a disposition for value.
The undersigned now has, and, except as contemplated by clause (i), (ii),
(iii) or (iv) above, for the duration of this Lock-Up Agreement will have,
good and marketable title to the Undersigned's Shares, free and clear of all
liens, encumbrances, and claims whatsoever.  The undersigned also agrees and
consents to the entry of stop transfer instructions with the Company's
transfer agent and registrar against the transfer of the Undersigned's Shares
except in compliance with the foregoing restrictions.

       The undersigned understands that the Company and the Underwriters are
relying upon this Lock-Up Agreement in proceeding toward consummation of the
offering.  The undersigned further understands that this Lock-Up Agreement is
irrevocable and shall be binding upon the undersigned's heirs, legal
underwriters, successors, and assigns.

                                       2

<PAGE>

       This Lock-Up Agreement shall automatically terminate on November 30,
2000 in the event that no Shares have been purchased and paid for pursuant to
the Underwriting Agreement by such date.

                                          Very truly yours,

                                          -----------------------------------
                                          Exact Name of Shareholder

                                          -----------------------------------
                                          Authorized Signature

                                          -----------------------------------
                                          Title

                                       3





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