ALEXION PHARMACEUTICALS INC
S-3/A, 1999-11-19
PHARMACEUTICAL PREPARATIONS
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<PAGE>

   As filed with the Securities and Exchange Commission on November 19, 1999

                                                      Registration No. 333-89343
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------


                                AMENDMENT NO. 2
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

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

                         ALEXION PHARMACEUTICALS, INC.
             (Exact Name of Registrant as Specified in Its Charter)

<TABLE>
<S>                             <C>
           DELAWARE                   13-3648318
 (State or Other Jurisdiction      (I.R.S. Employer
              of                Identification Number)
Incorporation or Organization)
</TABLE>

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

                                25 SCIENCE PARK
                              NEW HAVEN, CT 06511
                                 (203) 776-1790
         (Address, Including Zip Code, and Telephone Number, Including
            Area Code, of Registrant's Principal Executive Offices)
                         ------------------------------

                               LEONARD BELL, M.D.
                         ALEXION PHARMACEUTICALS, INC.
                                25 SCIENCE PARK
                              NEW HAVEN, CT 06511
                                 (203) 776-1790
           (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent for Service)
                         ------------------------------

Copies of all communications, including all communications sent to the agent for
                          service, should be sent to:

<TABLE>
<S>                                               <C>
            MERRILL M. KRAINES, ESQ.                            DAVID R. KING, ESQ.
           LAWRENCE A. SPECTOR, ESQ.                           MICHAEL J. SHIM, ESQ.
          FULBRIGHT & JAWORSKI L.L.P.                       MORGAN, LEWIS & BOCKIUS LLP
                666 FIFTH AVENUE                                 1701 MARKET STREET
            NEW YORK, NEW YORK 10103                      PHILADELPHIA, PENNSYLVANIA 19103
                 (212) 318-3000                                    (215) 963-5000
</TABLE>

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

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to
time after the effective date of this Registration Statement.

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plan, please check the following box: / /

If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, other than securities offered only in connection with dividend
or interest reinvestment plans, check the following box. / /

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / / _____

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / / _____

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. /X/
                           --------------------------

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

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- --------------------------------------------------------------------------------
<PAGE>
                                    PART II

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

The following table sets forth Alexion Pharmaceuticals, Inc. (the "Company")
estimates (other than the SEC registration fee, NASD filing fee and Nasdaq
listing fee) of the expenses in connection with the issuance and distribution of
the shares of common stock being registered.


<TABLE>
<S>                                                           <C>
SEC registration fee........................................  $ 12,643.00
NASD filing fee.............................................  $  4,291.46
Nasdaq listing fee..........................................  $ 17,500.00
Legal fees and expenses.....................................  $190,000.00
Accounting fees and expenses................................  $ 75,000.00
Printing expenses...........................................  $150,000.00
Miscellaneous expenses......................................  $ 25,565.54
                                                              -----------
    Total:..................................................  $475,000.00
                                                              ===========
</TABLE>


ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

Section 145 of the Delaware General Corporation Law (the "DGCL") empowers a
Delaware corporation to indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of such corporation) by reason of the
fact that such person is or was a director, officer, employee or agent of such
corporation, or is or was serving at the request of such corporation as a
director, officer, employee or agent of another corporation or enterprise. A
corporation may, in advance of the final disposition of any civil, criminal,
administrative or investigative action, suit or proceeding, pay the expenses
(including attorneys' fees) incurred by any officer, director, employee or agent
in defending such action, provided that the director or officer undertakes to
repay such amount if it shall ultimately be determined that he is not entitled
to be indemnified by the corporation. A corporation may indemnify such person
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful.

A Delaware corporation may indemnify officers and directors in an action by or
in the right of the corporation to procure a judgment in its favor under the
same conditions, except that no indemnification is permitted without judicial
approval if the officer or director is adjudged to be liable to the corporation.
Where an officer or director is successful on the merits or otherwise in the
defense of any action referred to above, the corporation must indemnify him
against the expenses (including attorneys' fees) which he actually and
reasonably incurred in connection therewith. The indemnification provided is not
deemed to be exclusive of any other rights to which an officer or director may
be entitled under any corporation's by-law, agreement, vote or otherwise.

In accordance with Section 145 of the DGCL, Section EIGHTH of the Company's
Certificate of Incorporation, as amended (the "Certificate") provides that the
Company shall indemnify each person who is or was a director, officer, employee
or agent of the Company (including the heirs, executors, administrators or
estate of such person) or is or was serving at the request of the Company as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, to the fullest extent permitted. The
indemnification provided by the Certificate shall not be

                                      II-1
<PAGE>
deemed exclusive of any other rights to which any of those seeking
indemnification or advancement of expenses may be entitled under any by-law,
agreement, vote of shareholders or disinterested directors or otherwise, both as
to action in his official capacity and as to action in another capacity while
holding such office, and shall continue as to a person who has ceased to be a
director, officer, employee or agent and shall inure to the benefit of the
heirs, executors and administrators of such a person. Expenses (including
attorneys' fees) incurred in defending a civil, criminal, administrative or
investigative action, suit or proceeding shall be paid by the Company in advance
of the final disposition of such action, suit or proceeding upon receipt of an
undertaking by or on behalf of the indemnified person to repay such amount if it
shall ultimately be determined that he is not entitled to be indemnified by the
Company. Section NINTH of the Certificate provides that a director of the
Company shall not be personally liable to the Company or its stockholders for
monetary damages for breach of fiduciary duty as a director, except for
liability (i) for any breach of the director's duty of loyalty to the Company or
its stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) under Section 174 of
the DGCL, or (iv) for any transaction from which the director derived an
improper personal benefit.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

    (a) Exhibits.


1.1 Form of Purchase Agreement.



5.1 Opinion of Fulbright & Jaworski L.L.P. regarding legality.



23.1 Consent of Fulbright & Jaworski L.L.P. (included in Exhibit 5.1).


23.2 Consent of Arthur Andersen LLP, Independent Auditors.


24.1 Power of Attorney (included on signature page).*



    *   Previously filed.


    (b) Financial Statement Schedules.

None.

ITEM 17. UNDERTAKINGS.

    (a) The undersigned Registrant hereby undertakes:

(1) For purposes of determining any liability under the Securities Act of 1933,
    the information omitted from the form of prospectus filed as part of this
    registration statement in reliance upon Rule 430A and contained in a form of
    prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or
    497(h) under the Securities Act shall be deemed to be part of this
    registration statement as of the time it was declared effective.

(2) For the purpose of determining any liability under the Securities Act of
    1933, each post-effective amendment that contains a form of prospectus shall
    be deemed to be a new registration statement relating to the securities
    offered therein, and the offering of such securities at that time shall be
    deemed to be the initial BONA FIDE offering thereof.

                                      II-2
<PAGE>
    (b) The undersigned registrant hereby undertakes to deliver or cause to be
       delivered with the prospectus, to each person to whom the prospectus is
       sent or given, the latest annual report, to security holders that is
       incorporated by reference in the prospectus and furnished pursuant to and
       meeting the requirements of Rule 14a-3 or Rule 14c-3 under the Securities
       Exchange Act of 1934; and, where interim financial information required
       to be presented by Article 3 of Regulation S-X is not set forth in the
       prospectus, to deliver, or cause to be delivered to each person to whom
       the prospectus is sent or given, the latest quarterly report that is
       specifically incorporated by reference in the prospectus to provide such
       interim financial information.

    (c) The undersigned registrant hereby undertakes that, for purposes of
       determining any liability under the Securities Act of 1933, each filing
       of the registrant's annual report pursuant to Section 13(a) or
       Section 15(d) of the Securities Exchange Act of 1934 that is incorporated
       by reference in the registration statement shall be deemed to be a new
       registration statement relating to the securities offered therein, and
       the offering of such securities at that time shall be deemed to be the
       initial bona fide offering thereof.

    (d) Insofar as indemnification for liabilities arising under the Securities
       Act of 1933 may be permitted to directors, officers and controlling
       persons of the registrant pursuant to the provisions described under Item
       15 above, or otherwise, the registrant has been advised that in the
       opinion of the Securities and Exchange Commission such indemnification is
       against public policy expressed in the Act and is, therefore,
       unenforceable. In the event that a claim for indemnification against such
       liabilities (other than the payment by the registrant of expenses
       incurred or paid by a director, officer or controlling person of the
       registrant in the successful defense of any action, suit or proceeding)
       is asserted by such director, officer or controlling person in connection
       with the securities being registered, the registrant will, unless in the
       opinion of its counsel the matter has been settled by controlling
       precedent, submit to a court of appropriate jurisdiction the question
       whether such indemnification by it is against public policy as expressed
       in the Act and will be governed by the final adjudication of such issue.

                                      II-3
<PAGE>
                                   SIGNATURES


PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THE
REGISTRANT HAS DULY CAUSED THIS AMENDMENT NO. 2 TO THE REGISTRATION STATEMENT TO
BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE
CITY OF NEW HAVEN AND STATE OF CONNECTICUT ON THE 19TH DAY OF NOVEMBER, 1999.


<TABLE>
<S>                                                    <C>  <C>
                                                       ALEXION PHARMACEUTICALS, INC.

                                                       By:               /s/ LEONARD BELL
                                                            -----------------------------------------
                                                                        Leonard Bell, M.D.
                                                               PRESIDENT, CHIEF EXECUTIVE OFFICER,
                                                                     SECRETARY AND TREASURER
</TABLE>





Pursuant to the requirements of the Securities Act of 1933, as amended, this
Amendment No. 2 to this Registration Statement has been signed by the following
persons in the capacities and on the dates indicated:



<TABLE>
<C>                                                    <S>                          <C>
                                                       President, Chief Executive
                  /s/ LEONARD BELL                       Officer, Secretary,
     -------------------------------------------         Treasurer and Director     November 19, 1999
                 Leonard Bell, M.D.                      (principal executive
                                                         officer)

                                                       Executive Vice President
                 /s/ DAVID W. KEISER                     and Chief Operating
     -------------------------------------------         Officer (principal         November 19, 1999
                   David W. Keiser                       financial officer)

                                                       Vice President of Finance
                          *                              and Administration
     -------------------------------------------         (principal accounting      November 19, 1999
                    Barry P. Luke                        officer)

                          *
     -------------------------------------------       Chairman of the Board of     November 19, 1999
                John H. Fried, Ph.D.                     Directors

                          *
     -------------------------------------------       Director                     November 19, 1999
                  Jerry T. Jackson

                          *
     -------------------------------------------       Director                     November 19, 1999
            Joseph A. Madri, Ph.D., M.D.
</TABLE>


                                      II-4
<PAGE>

<TABLE>
<C>                                                    <S>                          <C>
                          *
     -------------------------------------------       Director                     November 19, 1999
              Leonard Marks, Jr., Ph.D.

                          *
     -------------------------------------------       Director                     November 19, 1999
                   Max Link, Ph.D.

                          *
     -------------------------------------------       Director                     November 19, 1999
                   Eileen M. More

                          *
     -------------------------------------------       Director                     November 19, 1999
                  R. Douglas Norby

                          *
     -------------------------------------------       Director                     November 19, 1999
                   Alvin S. Parven
</TABLE>


<TABLE>
<S>   <C>                                                    <C>                          <C>
*By:                    /s/ LEONARD BELL
             --------------------------------------
                       Leonard Bell, M.D.
                       AS ATTORNEY-IN-FACT
</TABLE>

                                      II-5
<PAGE>
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
       EXHIBIT
       NUMBER                             EXHIBIT
- ---------------------                     -------
<C>                     <S>               <C>

         1.1            Form of Purchase Agreement.

         5.1            Opinion of Fulbright & Jaworski L.L.P.

        23.1            Consent of Fulbright & Jaworski L.L.P. (included in Exhibit 5.1).

        23.2            Consent of Arthur Andersen LLP, Independent Auditors.

        24.1            Power of Attorney (included in signature page).*
</TABLE>



    *   Previously filed.


                                      II-6

\<PAGE>
                                                               Exhibit 1.1


                          ALEXION PHARMACEUTICALS, INC.

                    COMMON STOCK, PAR VALUE $0.0001 PER SHARE

                               PURCHASE AGREEMENT

                                                   _____________________, 199___

U.S. BANCORP PIPER JAFFRAY
HAMBRECHT & QUIST LLC
 As Representatives of the several
  Underwriters named in Schedule I hereto
c/o U.S. Bancorp Piper Jaffray
Piper Jaffray Tower
222 South Ninth Street
Minneapolis, Minnesota  55402

Ladies and Gentlemen:

         Alexion Pharmaceuticals, Inc., a Delaware corporation (the "Company"),
proposes to sell to the several Underwriters named in Schedule I hereto (the
"Underwriters") an aggregate of 2,500,000 shares (the "Firm Shares") of Common
Stock, $0.0001 par value per share (the "Common Stock"), of the Company. The
Firm Shares consist of 2,500,000 authorized but unissued shares of Common Stock
to be issued and sold by the Company. The Company has also granted to the
several Underwriters an option to purchase up to 375,000 additional shares of
Common Stock on the terms and for the purposes set forth in Section 3 hereof
(the "Option Shares"). The Firm Shares and any Option Shares purchased pursuant
to this Purchase Agreement are herein collectively called the "Securities."

         The Company hereby confirms its agreement with respect to the sale of
the Securities to the several Underwriters, for whom you are acting as
Representatives (the "Representatives").

         1. REGISTRATION STATEMENT AND PROSPECTUS. A registration statement on
Form S-3 (File No. 333-89343) with respect to the Securities, including a
preliminary form of prospectus, has been prepared by the Company in conformity
with the requirements of the Securities Act of 1933, as amended (the "Act"), and
the rules and regulations ("Rules and Regulations") of the Securities and
Exchange Commission (the "Commission") thereunder and has been filed with the
Commission; one or more amendments to such registration statement have also been
so prepared and have been, or will be, so filed; and, if the Company has elected
to rely upon Rule 462(b) of the Rules and Regulations to increase the size of
the offering registered under the Act, the Company will prepare and file with
the Commission a registration statement with respect to such increase pursuant
to Rule 462(b). Copies of such registration statement(s) and amendments and each
related preliminary prospectus have been delivered to you.

         If the Company has elected not to rely upon Rule 430A of the Rules and
Regulations, the Company has prepared and will promptly file an amendment to the
registration statement and an amended prospectus (including a term sheet meeting
the requirements of Rule 434 of the Rules and Regulations). If the Company has
elected to rely upon Rule 430A of the Rules and Regulations, it will prepare and
file

<PAGE>

a prospectus (or a term sheet meeting the requirements of Rule 434) pursuant to
Rule 424(b) that discloses the information previously omitted from the
prospectus in reliance upon Rule 430A. Such registration statement as amended at
the time it is or was declared effective by the Commission, and, in the event of
any amendment thereto after the effective date and prior to the First Closing
Date (as hereinafter defined), such registration statement as so amended (but
only from and after the effectiveness of such amendment), including a
registration statement (if any) filed pursuant to Rule 462(b) of the Rules and
Regulations increasing the size of the offering registered under the Act and
information (if any) deemed to be part of the registration statement at the time
of effectiveness pursuant to Rules 430A(b) and 434(d) of the Rules and
Regulations, is hereinafter called the "Registration Statement." The prospectus
included in the Registration Statement at the time it is or was declared
effective by the Commission is hereinafter called the "Prospectus," except that
if any prospectus (including any term sheet meeting the requirements of Rule 434
of the Rules and Regulations provided by the Company for use with a prospectus
subject to completion within the meaning of Rule 434 in order to meet the
requirements of Section 10(a) of the Rules and Regulations) filed by the Company
with the Commission pursuant to Rule 424(b) (and Rule 434, if applicable) of the
Rules and Regulations or any other such prospectus provided to the Underwriters
by the Company for use in connection with the offering of the Securities
(whether or not required to be filed by the Company with the Commission pursuant
to Rule 424(b) of the Rules and Regulations) differs from the prospectus on file
at the time the Registration Statement is or was declared effective by the
Commission, the term "Prospectus" shall refer to such differing prospectus
(including any term sheet within the meaning of Rule 434 of the Rules and
Regulations) from and after the time such prospectus is filed with the
Commission or transmitted to the Commission for filing pursuant to such Rule
424(b) (and Rule 434, if applicable) or from and after the time it is first
provided to the Underwriters by the Company for such use. The term "Preliminary
Prospectus" as used herein means any preliminary prospectus included in the
Registration Statement prior to the time it becomes or became effective under
the Act and any prospectus subject to completion as described in Rule 430A or
434 of the Rules and Regulations.

         2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

         (a) The Company represents and warrants to, and agrees with, the
several Underwriters as follows:

                  (i) No order preventing or suspending the use of any
         Preliminary Prospectus has been issued by the Commission and each
         Preliminary Prospectus, at the time of filing thereof, did 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, in the light of the circumstances under which they were made,
         not misleading; except that the foregoing shall not apply to statements
         in or omissions from any Preliminary Prospectus in reliance upon, and
         in conformity with, written information furnished to the Company by
         you, or by any Underwriter through you, specifically for use in the
         preparation thereof.

                  (ii) As of the time the Registration Statement (or any
         post-effective amendment thereto, including a registration statement
         (if any) filed pursuant to Rule 462(b) of the Rules and Regulations
         increasing the size of the offering registered under the Act) is or was
         declared effective by the Commission, upon the filing or first delivery
         to the Underwriters of the Prospectus (or any supplement to the
         Prospectus (including any term sheet meeting the requirements of Rule
         434 of the Rules and Regulations)) and at the First Closing Date and
         Second Closing Date (as hereinafter defined), (A) the Registration
         Statement and Prospectus (in each case, as so amended and/or
         supplemented) conformed or will conform in all material

<PAGE>

         respects to the requirements of the Act and the Rules and Regulations,
         (B) the Registration Statement (as so amended) did not or will not
         include 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, and (C) the Prospectus (as so
         supplemented) did not or will not include 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, in light of the
         circumstances in which they are or were made, not misleading; except
         that the foregoing shall not apply to statements in or omissions from
         any such document in reliance upon, and in conformity with, written
         information furnished to the Company by you, or by any Underwriter
         through you, specifically for use in the preparation thereof. If the
         Registration Statement has been declared effective by the Commission,
         no stop order suspending the effectiveness of the Registration
         Statement has been issued, and no proceeding for that purpose has been
         initiated or, to the Company's knowledge, threatened by the Commission.

                  (iii) The financial statements of the Company, together with
         the notes thereto, set forth in the Registration Statement and
         Prospectus comply in all material respects with the requirements of the
         Act and fairly present the financial condition of the Company as of the
         dates indicated and the results of operations and changes in cash flows
         for the periods therein specified in conformity with generally accepted
         accounting principles consistently applied throughout the periods
         involved (except as otherwise stated therein); and the supporting
         schedules included in the Registration Statement present fairly the
         information required to be stated therein. No other financial
         statements or schedules are required to be included in the Registration
         Statement or Prospectus. Arthur Andersen LLP, which has expressed its
         opinion with respect to the audited consolidated financial statements
         filed as a part of the Registration Statement and included in the
         Registration Statement and Prospectus, are independent public
         accountants as required by the Act and the Rules and Regulations.

                  (iv) Each of the Company and its subsidiaries has been duly
         organized and is validly existing as a corporation in good standing
         under the laws of its jurisdiction of incorporation. Each of the
         Company and its subsidiaries has full corporate power and authority to
         own its properties and conduct its business as currently being carried
         on and as described in the Registration Statement and Prospectus, and
         is duly qualified to do business as a foreign corporation in good
         standing in each jurisdiction in which it owns or leases real property
         or in which the conduct of its business makes such qualification
         necessary and in which the failure to so qualify would have a material
         adverse effect upon its business, condition (financial or otherwise) or
         properties, taken as a whole.

                  (v) Except as contemplated in the Prospectus, subsequent to
         the respective dates as of which information is given in the
         Registration Statement and the Prospectus, neither the Company nor any
         of its subsidiaries has incurred any material liabilities or
         obligations, direct or contingent, or entered into any material
         transactions, or declared or paid any dividends or made any
         distribution of any kind with respect to its capital stock; and there
         has not been any change in the capital stock (other than a change in
         the number of outstanding shares of Common Stock due to the issuance of
         shares upon the exercise of outstanding options or warrants), or any
         material change in the short-term or long-term debt, or any issuance of
         options, warrants, convertible securities or other rights to purchase
         the capital stock, of the Company or any of its subsidiaries, or any
         material adverse change, or any development involving a prospective
         material adverse change, in the general affairs, condition (financial
         or otherwise), business, key personnel, property, net worth or results
         of operations of the Company and its subsidiaries, taken as a whole.

<PAGE>

                  (vi) Except as set forth in the Prospectus, there is not
         pending or, to the knowledge of the Company, threatened or
         contemplated, any action, suit or proceeding to which the Company or
         any of its subsidiaries is a party before or by any court or
         governmental agency, authority or body, or any arbitrator, which might
         result in any material adverse change in the condition (financial or
         otherwise), business, net worth or results of operations of the Company
         and its subsidiaries, taken as a whole.

                  (vii) There are no contracts or documents of the Company or
         any of its subsidiaries that are required to be filed as exhibits to
         the Registration Statement by the Act or by the Rules and Regulations
         that have not been so filed.

                  (viii) This Agreement has been duly authorized, executed and
         delivered by the Company, and constitutes a valid, legal and binding
         obligation of the Company, enforceable in accordance with its terms,
         except as rights to indemnity hereunder may be limited by federal or
         state securities laws and except as such enforceability may be limited
         by bankruptcy, insolvency, reorganization or similar laws affecting the
         rights of creditors generally and subject to general principles of
         equity. The execution, delivery and performance of this Agreement by
         the Company and the consummation by the Company of the transactions
         herein contemplated will not result in a breach or violation of any of
         the terms and provisions of, or constitute a default under, any
         statute, any agreement or instrument to which the Company is a party or
         by which it is bound or to which any of its property is subject, the
         Company's charter or by-laws, or any order, rule, regulation or decree
         of any court or governmental agency or body having jurisdiction over
         the Company or any of its properties; no consent, approval,
         authorization or order of, or filing with, any court or governmental
         agency or body is required for the execution, delivery and performance
         of this Agreement by the Company or for the consummation by the Company
         of the transactions contemplated hereby, including the issuance or sale
         of the Securities by the Company, except such as may be required under
         the Act or state securities or blue sky laws; or in connection with the
         review and of the offering with the National Association of Securities
         Dealers (the "NASD") and the Company has full power and authority to
         enter into this Agreement and to authorize, issue and sell the
         Securities as contemplated by this Agreement.

                  (ix) All of the issued and outstanding shares of capital stock
         of the Company, including the outstanding shares of Common Stock, are
         duly authorized and validly issued, fully paid and nonassessable, have
         been issued in compliance with all federal and state securities laws,
         were not issued in violation of or subject to any preemptive rights or
         other rights to subscribe for or purchase securities, and the holders
         thereof are not subject to personal liability by reason of being such
         holders; the Securities which may be sold hereunder by the Company have
         been duly authorized and, when issued, delivered and paid for in
         accordance with the terms hereof, will have been validly issued and
         will be fully paid and nonassessable, and the holders thereof will not
         be subject to personal liability by reason of being such holders; and
         the capital stock of the Company, including the Common Stock, conforms
         to the description thereof in the Registration Statement and
         Prospectus. There are no preemptive rights or other rights to subscribe
         for or to purchase, or any restriction upon the voting or transfer of,
         any shares of Common Stock pursuant to the Company's charter, by-laws
         or any agreement or other instrument to which the Company is a party or
         by which the Company is bound. Except as otherwise stated in the
         Registration Statement and Prospectus, neither the filing of the
         Registration Statement nor the offering or sale of the Securities as
         contemplated by this Agreement gives rise to any rights for or relating
         to

<PAGE>

         the registration of any shares of Common Stock or other securities of
         the Company, which have not been waived. All of the issued and
         outstanding shares of capital stock of each of the Company's
         subsidiaries have been duly and validly authorized and issued and are
         fully paid and nonassessable, and, except as otherwise described in the
         Registration Statement and Prospectus and except for any directors'
         qualifying shares, the Company owns of record and beneficially, free
         and clear of any security interests, claims, liens, proxies, equities
         or other encumbrances, all of the issued and outstanding shares of such
         stock. Except as described in the Registration Statement and the
         Prospectus, there are no options, warrants, agreements, contracts or
         other rights in existence to purchase or acquire from the Company or
         any subsidiary of the Company any shares of the capital stock of the
         Company or any subsidiary of the Company. The Company has an authorized
         and outstanding capitalization as set forth in the Registration
         Statement and the Prospectus.

                  (x) The Company and each of its subsidiaries holds, and is
         operating in compliance in all material respects with, all franchises,
         grants, authorizations, licenses, permits, easements, consents,
         certificates and orders of any governmental or self-regulatory body
         required for the conduct of its business (including those required by
         the U.S. Food and Drug Administration, the U.S. Nuclear Regulatory
         Commission and any federal, state or foreign agencies or bodies engaged
         in the regulation of pharmaceuticals or biohazardous substances) and
         all such franchises, grants, authorizations, licenses, permits,
         easements, consents, certifications and orders are valid and in full
         force and effect; and the Company and each of its subsidiaries is in
         compliance in all material respects with all applicable federal, state,
         local and foreign laws, regulations, orders and decrees; the Company
         has not received any notice of proceedings relating to the revocation
         or modification of any such franchises, grants, authorizations,
         licenses, permits, easements, consents, certifications and orders,
         which singly or in the aggregate, if the subject of an unfavorable
         decision, ruling or finding, could result in a material adverse effect
         on the Company.

                  (xi) The Company and its subsidiaries have good and marketable
         title to all property described in the Registration Statement and
         Prospectus as being owned by them, in each case free and clear of all
         liens, claims, security interests or other encumbrances except such as
         are described in the Registration Statement and the Prospectus; the
         property held under lease by the Company and its subsidiaries is held
         by them under valid, subsisting and enforceable leases with only such
         exceptions with respect to any particular lease as do not interfere in
         any material respect with the conduct of the business of the Company or
         its subsidiaries.

                  (xii) The Company and each of its subsidiaries owns or
         possesses or has licenses to use all patents, patent applications,
         trademarks, service marks, tradenames, trademark registrations, service
         mark registrations, copyrights, licenses, inventions, trade secrets and
         (such patents referred to herein as the "Patents" and all of such
         intellectual property referred to collectively as the "Intellectual
         Property") rights necessary for the conduct of the business of the
         Company and its subsidiaries as currently carried on and as described
         in the Registration Statement and Prospectus; except as stated in the
         Registration Statement and Prospectus, to the Company's knowledge, no
         name which the Company or any of its subsidiaries uses and no other
         aspect of the business of the Company or any of its subsidiaries as
         conducted on the date hereof involves or gives rise to any infringement
         of, or license or similar fees for, any patents, patent applications,
         trademarks, service marks, tradenames, trademark registrations, service
         mark registrations, copyrights, licenses, inventions, trade secrets or
         other similar rights of others material to the business of the Company
         and neither the Company nor any of its subsidiaries has

<PAGE>

         received any notice alleging any such infringement or fee. The Company
         has duly and properly filed or caused to be filed with the U.S. Patent
         and Trademark Office (the "PTO") and applicable foreign and
         international patent authorities all patent applications described in
         the Registration Statement and the Prospectus (the "Patent
         Applications"); in connection with the filing of the Patent
         Applications, the Company conducted reasonable investigations of the
         published literature and patent references relating to the inventions
         claimed in such applications; to the best of the Company's knowledge,
         it has complied with the PTO's duty of candor and disclosure for the
         Patent Applications and has made no misrepresentation in the Patent
         Applications; the Company is not aware of any facts material to a
         determination of patentability regarding the Patent Applications not
         called to the attention of the PTO which would preclude the grant of a
         patent for the Patent Applications; and the Company has no knowledge of
         any facts which would preclude it from having clear title to the Patent
         Applications.

                  (xiii) Neither the Company nor any of its subsidiaries is in
         violation of its respective charter or by-laws or in breach of or
         otherwise in default in the performance of any material obligation,
         agreement or condition contained in any bond, debenture, note,
         indenture, loan agreement or any other material contract, lease or
         other instrument to which it is subject or by which any of them may be
         bound, or to which any of the material property or assets of the
         Company or any of its subsidiaries is subject.

                  (xiv) The Company and its subsidiaries have filed all federal,
         state, local and foreign income and franchise tax returns required to
         be filed and are not in default in the payment of any taxes which were
         payable pursuant to said returns or any assessments with respect
         thereto, other than any which the Company or any of its subsidiaries is
         contesting in good faith or which could result in a material adverse
         effect on the financial condition of the Company.

                  (xv) The Company has not distributed and will not distribute
         any prospectus or other offering material in connection with the
         offering and sale of the Securities other than any Preliminary
         Prospectus or the Prospectus or other materials permitted by the Act to
         be distributed by the Company.

                  (xvi) All necessary filings shall have been made and all
         filing fees shall have been paid to effect the listing of the
         Securities on the Nasdaq National Market.

                  (xvii) Other than Columbus Farming Corporation ("CFC") and
         Biotechnology Research and Development Corporation, the Company owns no
         capital stock or other equity or ownership or proprietary interest in
         any corporation, partnership, association, trust or other entity.

                  (xviii) The Company maintains a system of internal accounting
         controls sufficient to provide reasonable assurances that (i)
         transactions are executed in accordance with management's general or
         specific authorization; (ii) transactions are recorded as necessary to
         permit preparation of financial statements in conformity with generally
         accepted accounting principles and to maintain accountability for
         assets; (iii) access to assets is permitted only in accordance with
         management's general or specific authorization; and (iv) the recorded
         accountability for assets is compared with existing assets at
         reasonable intervals and appropriate action is taken with respect to
         any differences.

                  (xix) Other than as contemplated by this Agreement, the
         Company has not incurred any liability for any finder's or broker's fee
         or agent's commission in connection with


<PAGE>

         the execution and delivery of this Agreement or the consummation of the
         transactions contemplated hereby.

                  (xx) Arthur Andersen LLP are, and during the periods covering
         their report included in the Registration Statement and Prospectus were
         independent accountants with respect to the Company as required by the
         Securities Act. The audited financial statements of the Company
         (together with the related notes thereto) included in and incorporated
         by reference in the Registration Statement present fairly in all
         material respects the financial position and results of operations of
         the Company at the respective dates and for the respective periods to
         which they apply, subject to normal year-end adjustments. Such
         financial statements (together with the related notes thereto) have
         been prepared in accordance with generally accepted accounting
         principles consistently applied throughout the periods involved.

                  (xxi) The Company has reviewed its operations to evaluate the
         extent to which the business or operations of the Company will be
         affected materially by a significant risk that computer hardware or
         software applications used by the Company will not, in the case of
         dates or time period occurring after December 31, 1999, function at
         least as effectively as in the case of dates or time periods prior to
         January 1, 2000 (the "Y2K Problem"); as a result of such review (a) the
         Company has no reason to believe, and does not believe, that there are
         any issues related to the Company's preparedness to address the Y2K
         Problem that are of a character required to be described or referred to
         in the Registration Statement or Prospectus which have not been
         accurately described in the Registration Statement or Prospectus and
         (b) the Company reasonably believes that the suppliers, vendors,
         customers or other material third parties used or served by the Company
         are addressing or will address the Y2K Problem in a timely manner,
         except to the extent that a failure to address the Y2K Problem by any
         supplier, vendor, customer or material third party would not have a
         material adverse effect on the Company.

                  (xxii) Neither the Company nor any of its affiliates is
         presently doing business with the government of Cuba or with any person
         or affiliate located in Cuba.

         (b) Any certificate signed by any officer of the Company and delivered
to you or to counsel for the Underwriters shall be deemed a representation and
warranty by the Company to each Underwriter as to the matters covered thereby.

         3. PURCHASE, SALE AND DELIVERY OF SECURITIES.

         (a) On the basis of the representations, warranties and agreements
herein contained, but subject to the terms and conditions herein set forth, the
Company agrees to issue and sell 2,500,000 Firm Shares to the several
Underwriters, and each Underwriter agrees, severally and not jointly, to
purchase from the Company the Firm Shares. The purchase price for each Firm
Share shall be $    per share. The obligation of each Underwriter to the Company
shall be to purchase from the Company that number of Firm Shares (to be adjusted
by the Representatives to avoid fractional shares) which represents the same
proportion of the number of Firm Shares to be sold by the Company pursuant to
this Agreement as the number of Firm Shares set forth opposite the name of such
Underwriter in Schedule I hereto represents to the total number of Firm Shares
to be purchased by all Underwriters pursuant to this Agreement. In making this
Agreement, each Underwriter is contracting severally and not jointly; except as
provided in paragraph (c) of this Section 3 and in Section 8 hereof, the
agreement of each Underwriter is to purchase only the respective number of Firm
Shares specified in Schedule I.
<PAGE>

         The Firm Shares will be delivered by the Company to you for the
accounts of the several Underwriters against payment of the purchase price
therefor by same day funds payable to the order of the Company, as
appropriate, at the offices of U.S. Bancorp Piper Jaffray, Piper Jaffray
Tower, 222 South Ninth Street, Minneapolis, Minnesota, or such other location
as may be mutually acceptable, at 9:00 a.m. Central time on the third (or if
the Securities are priced, as contemplated by Rule 15c6-1(c) under the
Exchange Act, after 4:30 p.m. Eastern time, the fourth) full business day
following the date hereof, or at such other time and date as you and the
Company determine pursuant to Rule 15c6-1(a) under the Exchange Act, such
time and date of delivery being herein referred to as the "First Closing
Date." If the Representatives so elect, delivery of the Firm Shares may be
made by credit through full fast transfer to the accounts at The Depository
Trust Company designated by the Representatives. Certificates representing
the Firm Shares, in definitive form and in such denominations and registered
in such names as you may request upon at least two business days' prior
notice to the Company, will be made available for checking and packaging not
later than 10:30 a.m., Central time, on the business day next preceding the
First Closing Date at the offices of U.S. Bancorp Piper Jaffray, Piper
Jaffray Tower, 222 South Ninth Street, Minneapolis, Minnesota, or such other
location as may be mutually acceptable.

         (b) On the basis of the representations, warranties and agreements
herein contained, but subject to the terms and conditions herein set forth, the
Company, with respect to 375,000 Option Shares hereby grants to the several
Underwriters an option to purchase all or any portion of the Option Shares at
the same purchase price as the Firm Shares, for use solely in covering any
over-allotments made by the Underwriters in the sale and distribution of the
Firm Shares. The option granted hereunder may be exercised at any time (but not
more than once) within 30 days after the effective date of this Agreement upon
notice (confirmed in writing) by the Representatives to the Company and to the
Attorneys-in-Fact setting forth the aggregate number of Option Shares as to
which the several Underwriters are exercising the option, the names and
denominations in which the certificates for the Option Shares are to be
registered and the date and time, as determined by you, when the Option Shares
are to be delivered, such time and date being herein referred to as the "Second
Closing" and "Second Closing Date", respectively; provided, however, that the
Second Closing Date shall not be earlier than the First Closing Date nor earlier
than the second business day after the date on which the option shall have been
exercised. The number of Option Shares to be purchased by each Underwriter shall
be the same percentage of the total number of Option Shares to be purchased by
the several Underwriters as the number of Firm Shares to be purchased by such
Underwriter is of the total number of Firm Shares to be purchased by the several
Underwriters, as adjusted by the Representatives in such manner as the
Representatives deem advisable to avoid fractional shares. No Option Shares
shall be sold and delivered unless the Firm Shares previously have been, or
simultaneously are, sold and delivered.

         The Option Shares will be delivered by the Company to you for the
accounts of the several Underwriters against payment of the purchase price
therefor by same day funds payable to the order of the Company, at the offices
of U.S. Bancorp Piper Jaffray, Piper Jaffray Tower, 222 South Ninth Street,
Minneapolis, Minnesota, or such other location as may be mutually acceptable at
9:00 a.m., Central time, on the Second Closing Date. If the Representatives so
elect, delivery of the Option Shares may be made by credit through full fast
transfer to the accounts at The Depository Trust Company designated by the
Representatives. Certificates representing the Option Shares in definitive form
and in such denominations and registered in such names as you have set forth in
your notice of option exercise, will be made available for checking and
packaging not later than 10:30 a.m., Central time, on the business day next
preceding the Second Closing Date at the office of U.S. Bancorp Piper Jaffray,
Piper Jaffray Tower, 222 South Ninth Street, Minneapolis, Minnesota, or such
other location as may be mutually acceptable.

         (c) It is understood that you, individually and not as Representatives
of the several


<PAGE>

Underwriters, may (but shall not be obligated to) make payment to the Company,
on behalf of any Underwriter for the Securities to be purchased by such
Underwriter. Any such payment by you shall not relieve any such Underwriter of
any of its obligations hereunder. Nothing herein contained shall constitute any
of the Underwriters an unincorporated association or partner with the Company.

         4. COVENANTS.

         (a) The Company covenants and agrees with the several Underwriters as
follows:

                  (i) If the Registration Statement has not already been
         declared effective by the Commission, the Company will use its best
         efforts to cause the Registration Statement and any post-effective
         amendments thereto to become effective as promptly as possible; the
         Company will notify you promptly of the time when the Registration
         Statement or any post-effective amendment to the Registration Statement
         has become effective or any supplement to the Prospectus (including any
         term sheet within the meaning of Rule 434 of the Rules and Regulations)
         has been filed and of any request by the Commission for any amendment
         or supplement to the Registration Statement or Prospectus or additional
         information; if the Company has elected to rely on Rule 430A of the
         Rules and Regulations, the Company will prepare and file a Prospectus
         (or term sheet within the meaning of Rule 434 of the Rules and
         Regulations) containing the information omitted therefrom pursuant to
         Rule 430A of the Rules and Regulations with the Commission within the
         time period required by, and otherwise in accordance with the
         provisions of, Rules 424(b), 430A and 434, if applicable, of the Rules
         and Regulations; if the Company has elected to rely upon Rule 462(b) of
         the Rules and Regulations to increase the size of the offering
         registered under the Act, the Company will prepare and file a
         registration statement with respect to such increase with the
         Commission within the time period required by, and otherwise in
         accordance with the provisions of, Rule 462(b); the Company will
         prepare and file with the Commission, promptly upon your request, any
         amendments or supplements to the Registration Statement or Prospectus
         (including any term sheet within the meaning of Rule 434 of the Rules
         and Regulations) that, in your opinion, may be necessary or advisable
         in connection with the distribution of the Securities by the
         Underwriters; and the Company will not file any amendment or supplement
         to the Registration Statement or Prospectus (including any term sheet
         within the meaning of Rule 434 of the Rules and Regulations) to which
         you shall reasonably object by notice to the Company after having been
         furnished a copy a reasonable time prior to the filing.

                  (ii) The Company will advise you, promptly after it shall
         receive notice or obtain knowledge thereof, of the issuance by the
         Commission of any stop order suspending the effectiveness of the
         Registration Statement, of the suspension of the qualification of the
         Securities for offering or sale in any jurisdiction, or of the
         initiation or threatening of any proceeding for any such purpose; and
         the Company will promptly use its best efforts to prevent the issuance
         of any stop order or to obtain its withdrawal if such a stop order
         should be issued.

                  (iii) Within the time during which a prospectus (including any
         term sheet within the meaning of Rule 434 of the Rules and Regulations)
         relating to the Securities is required to be delivered under the Act,
         the Company will comply as far as it is able with all requirements
         imposed upon it by the Act, as now and hereafter amended, and by the
         Rules and Regulations, as from time to time in force, so far as
         necessary to permit the continuance of sales of or dealings in the
         Securities as contemplated by the provisions hereof and the Prospectus.
         If during such period any event occurs as a result of which the
         Prospectus would include an untrue


<PAGE>

         statement of a material fact or omit to state a material fact necessary
         to make the statements therein, in the light of the circumstances then
         existing, not misleading, or if during such period it is necessary to
         amend the Registration Statement or supplement the Prospectus to comply
         with the Act, the Company will promptly notify you and will amend the
         Registration Statement or supplement the Prospectus (at the expense of
         the Company) so as to correct such statement or omission or effect such
         compliance.

                  (iv) The Company will use its best efforts to qualify the
         Securities for sale under the securities laws of such jurisdictions as
         you reasonably designate and to continue such qualifications in effect
         so long as required for the distribution of the Securities, except that
         the Company shall not be required in connection therewith to qualify as
         a foreign corporation or to execute a general consent to service of
         process in any state.

                  (v) The Company will furnish to the Underwriters copies of the
         Registration Statement (one of which will be signed and will include
         all exhibits), each Preliminary Prospectus, the Prospectus, and all
         amendments and supplements (including any term sheet within the meaning
         of Rule 434 of the Rules and Regulations) to such documents, in each
         case as soon as available and in such quantities as you may from time
         to time reasonably request.

                  (vi) During a period of two years commencing with the date
         hereof, the Company will furnish to the Representatives, and to each
         Underwriter who may so request in writing, copies of all periodic and
         special reports furnished to the stockholders of the Company and all
         information, documents and reports filed with the Commission, the
         National Association of Securities Dealers, Inc., or any securities
         exchange.

                  (vii) The Company will make generally available to its
         security holders as soon as practicable, but in any event not later
         than 15 months after the end of the Company's current fiscal quarter,
         an earnings statement (which need not be audited) covering a 12-month
         period beginning after the effective date of the Registration Statement
         that shall satisfy the provisions of Section 11(a) of the Act and Rule
         158 of the Rules and Regulations.

                  (viii) The Company, whether or not the transactions
         contemplated hereunder are consummated or this Agreement is prevented
         from becoming effective under the provisions of Section 9(a) hereof or
         is terminated, will pay or cause to be paid, upon receipt of a
         reasonably detailed accounting, (A) all expenses (including transfer
         taxes allocated to the respective transferees) incurred in connection
         with the delivery to the Underwriters of the Securities, (B) all
         expenses and fees (including, without limitation, fees and expenses of
         the Company's accountants and counsel but, except as otherwise provided
         below, not including fees of the Underwriters' counsel) in connection
         with the preparation, printing, filing, delivery, and shipping of the
         Registration Statement (including the financial statements therein and
         all amendments, schedules, and exhibits thereto), the Securities, each
         Preliminary Prospectus, the Prospectus, and any amendment thereof or
         supplement thereto, and the printing, delivery, and shipping of this
         Agreement and other underwriting documents, including Blue Sky
         Memoranda, (C) all filing fees and fees and disbursements of the
         Underwriters' counsel incurred in connection with the qualification of
         the Securities for offering and sale by the Underwriters or by dealers
         under the securities or blue sky laws of the states and other
         jurisdictions which you shall designate in accordance with Section 4(d)
         hereof, (D) the fees and expenses of any transfer agent or registrar,
         (E) the filing fees incident to any required review by the National
         Association of Securities Dealers, Inc. of the terms of the sale of the
         Securities, (F) listing fees, if any, and (G) all other

<PAGE>

         costs and expenses incident to the performance of its obligations
         hereunder that are not otherwise specifically provided for herein. If
         the sale of the Securities provided for herein is not consummated by
         reason of action by the Company pursuant to Section 9(a) hereof which
         prevents this Agreement from becoming effective, or by reason of any
         failure, refusal or inability on the part of the Company to perform any
         agreement on its part to be performed, or because any other condition
         of the Underwriters' obligations hereunder required to be fulfilled by
         the Company is not fulfilled, upon receipt of a reasonably detailed
         accounting, the Company will reimburse the several Underwriters for all
         out-of-pocket disbursements (including fees and disbursements of
         counsel) incurred by the Underwriters in connection with their
         investigation, preparing to market and marketing the Securities or in
         contemplation of performing their obligations hereunder. The Company
         shall not in any event be liable to any of the Underwriters for loss of
         anticipated profits from the transactions covered by this Agreement.

                  (ix) The Company will apply the net proceeds from the sale of
         the Securities to be sold by it hereunder for the purposes set forth in
         the Prospectus and will file such reports with the Commission with
         respect to the sale of the Securities and the application of the
         proceeds therefrom as may be required in accordance with Rule 463 of
         the Rules and Regulations.

                  (x) The Company will not, without your prior written consent,
         offer for sale, sell, contract to sell, grant any option for the sale
         of or otherwise issue or dispose of any Common Stock or any securities
         convertible into or exchangeable for, or any options or rights to
         purchase or acquire, Common Stock, except to the Underwriters pursuant
         to this Agreement, for a period of 90 days after the commencement of
         the public offering of the Securities by the Underwriters.

                  (xi) The Company either has caused to be delivered to you or
         will cause to be delivered to you prior to the effective date of the
         Registration Statement a letter from each of the Company's directors
         and officers and holders of 5% or greater of the Company's Common Stock
         prior to the offering stating that such person agrees that he or she
         will not, without your prior written consent, offer for sale, sell,
         contract to sell or otherwise dispose of any shares of Common Stock or
         rights to purchase Common Stock for a period of 90 days after
         commencement of the public offering of the Securities by the
         Underwriters.

                  (xii) The Company has not taken and will not take, directly or
         indirectly, any action designed to or which might reasonably be
         expected to cause or result in, or which has constituted, the
         stabilization or manipulation of the price of any security of the
         Company to facilitate the sale or resale of the Securities, and has not
         effected any sales of Common Stock which are required to be disclosed
         in response to Item 701 of Regulations S-K under the Act which have not
         been so disclosed in the Registration Statement other than those
         described under the Company's Exchange Act filings.

                  (xiii) Except as contemplated by this Agreement, the Company
         will not incur any liability for any finder's or broker's fee or
         agent's commission in connection with the execution and delivery of
         this Agreement or the consummation of the transactions contemplated
         hereby.

                  (xiv) The Company will inform the Florida Department of
         Banking and Finance at any time prior to the consummation of the
         distribution of the Securities by the Underwriters if it commences
         engaging in business with the government of Cuba or with any person or
         affiliate located in Cuba. Such information will be provided within 90
         days after the commencement thereof or after a change occurs with
         respect to previously reported information.
<PAGE>


         5. CONDITIONS OF UNDERWRITERS' OBLIGATIONS. The obligations of the
several Underwriters hereunder are subject to the accuracy, as of the date
hereof and at each of the First Closing Date and the Second Closing Date (as if
made at such Closing Date), of and compliance with all representations,
warranties and agreements of the Company contained herein, to the performance by
the Company of its obligations hereunder and to the following additional
conditions:

         (a) The Registration Statement shall have become effective not later
than 5:00 p.m., Central time, on the date of this Agreement, or such later time
and date as you, as Representatives of the several Underwriters, shall approve
and all filings required by Rules 424, 430A and 434 of the Rules and Regulations
shall have been timely made; no stop order suspending the effectiveness of the
Registration Statement or any amendment thereof shall have been issued; no
proceedings for the issuance of such an order shall have been initiated or
threatened; and any request of the Commission for additional information (to be
included in the Registration Statement or the Prospectus or otherwise) shall
have been complied with to your satisfaction.

         (b) No Underwriter shall have advised the Company that the Registration
Statement or the Prospectus, or any amendment thereof or supplement thereto
(including any term sheet within the meaning of Rule 434 of the Rules and
Regulations), contains an untrue statement of fact which, in your opinion, is
material, or omits to state a fact which, in your opinion, is material and is
required to be stated therein or necessary to make the statements therein not
misleading.

         (c) Except as contemplated in the Prospectus, subsequent to the
respective dates as of which information is given in the Registration Statement
and the Prospectus, neither the Company nor any of its subsidiaries shall have
incurred any material liabilities or obligations, direct or contingent, or
entered into any material transactions, or declared or paid any dividends or
made any distribution of any kind with respect to its capital stock; and there
shall not have been any change in the capital stock (other than a change in the
number of outstanding shares of Common Stock due to the issuance of shares upon
the exercise of outstanding options or warrants), or any material change in the
short-term or long-term debt of the Company, or any issuance of options,
warrants, convertible securities or other rights to purchase the capital stock
of the Company or any of its subsidiaries, or any material adverse change or any
development involving a prospective material adverse change (whether or not
arising in the ordinary course of business), in the general affairs, condition
(financial or otherwise), business, key personnel, property, net worth or
results of operations of the Company and its subsidiaries, taken as a whole,
that, in your judgment, makes it impractical or inadvisable to offer or deliver
the Securities on the terms and in the manner contemplated in the Prospectus.

         (d) On each Closing Date, there shall have been furnished to you, as
Representatives of the several Underwriters, the opinion of Fulbright & Jaworski
L.L.P., counsel for the Company, dated such Closing Date and addressed to you,
to the effect that:

                  (i) Each of the Company and CFC has been duly organized and is
         validly existing as a corporation in good standing under the laws of
         its jurisdiction of incorporation. Each of the Company and CFC has full
         corporate power and authority to own its properties and conduct its
         business as currently being carried on and as described in the
         Registration Statement and Prospectus, and the Company is duly
         qualified to do business as a foreign corporation and is in good
         standing in Connecticut.

                  (ii) The capital stock of the Company conforms as to legal
         matters to the


<PAGE>

         description thereof contained in the Prospectus under the caption
         "Description of Capital Stock." All of the issued and outstanding
         shares of the capital stock of the Company have been duly authorized
         and validly issued and are fully paid and nonassessable, and the
         holders thereof are not subject to personal liability by reason of
         being such holders. The Securities to be issued and sold by the Company
         hereunder have been duly authorized and, when issued, delivered and
         paid for in accordance with the terms of this Agreement, will have been
         validly issued and will be fully paid and nonassessable, and the
         holders thereof will not be subject to personal liability by reason of
         being such holders. Except as otherwise stated in the Registration
         Statement and Prospectus, there are no preemptive rights or other
         rights to subscribe for or to purchase, or any restriction upon the
         voting or transfer of, any shares of Common Stock pursuant to the
         Company's charter, by-laws or any agreement or other instrument known
         to such counsel to which the Company is a party or by which the Company
         is bound. To the best of such counsel's knowledge, neither the filing
         of the Registration Statement nor the offering or sale of the
         Securities as contemplated by this Agreement gives rise to any rights
         for or relating to the registration of any shares of Common Stock or
         other securities of the Company, except those rights which have been
         waived.

                  (iii) All of the issued and outstanding shares of capital
         stock of CFC have been duly and validly authorized and issued and are
         fully paid and nonassessable, and, to the best of such counsel's
         knowledge, the Company owns of record and beneficially, free and clear
         of any security interests, claims, liens, proxies, equities or other
         encumbrances, all of the issued and outstanding shares of such stock.
         To the best of such counsel's knowledge, except as described in the
         Registration Statement and Prospectus, there are no options, warrants,
         agreements, contracts or other rights in existence to purchase or
         acquire from the Company or CFC any shares of the capital stock of the
         Company or CFC.

                  (iv) The Registration Statement has become effective under the
         Act and, to the best of such counsel's knowledge, no stop order
         suspending the effectiveness of the Registration Statement has been
         issued and no proceeding for that purpose has been instituted or, to
         the knowledge of such counsel, threatened by the Commission.

                  (v) The descriptions in the Registration Statement and
         Prospectus of statutes, legal and governmental proceedings, contracts
         and other documents fairly present in all material respects the
         information required to be shown; and such counsel does not know of any
         statutes or legal or governmental proceedings required to be described
         in the Prospectus that are not described as required, or of any
         contracts or documents of a character required to be described in the
         Registration Statement or Prospectus or included as exhibits to the
         Registration Statement that are not described or included as required.

                  (vi) The Company has full corporate power and authority to
         enter into this Agreement, and this Agreement has been duly authorized,
         executed and delivered by the Company and constitutes a valid, legal
         and binding obligation of the Company enforceable in accordance with
         its terms (except as rights to indemnity hereunder may be limited by
         federal or state securities laws and except as such enforceability may
         be limited by bankruptcy, insolvency, reorganization or similar laws
         affecting the rights of creditors generally and subject to general
         principles of equity); the execution, delivery and performance of this
         Agreement by the Company and the consummation by the Company of the
         transactions herein contemplated will not result in a breach or
         violation of any of the terms and provisions of, or constitute a
         default under, any statute, rule or regulation, any agreement or
         instrument known to such counsel to which the

<PAGE>

         Company is a party or by which it is bound or to which any of its
         property is subject, the Company's charter or by-laws, or any order or
         decree known to such counsel of any court or governmental agency or
         body having jurisdiction over the Company or any of its respective
         properties; and no consent, approval, authorization or order of, or
         filing with, any court or governmental agency or body is required for
         the execution, delivery and performance of this Agreement by the
         Company or for the consummation by the Company of the transactions
         contemplated hereby, including the issuance or sale of the Securities
         by the Company, except such as may be required under the Act or state
         securities laws or in connection with the review and clearance of the
         offering with the NASD.

                  (vii) To the best of such counsel's knowledge, the Company and
         each of its subsidiaries holds, and is operating in compliance in all
         material respects with, all franchises, grants, authorizations,
         licenses, permits, easements, consents, certificates and orders of any
         governmental or self-regulatory body required for the conduct of its
         business and all such franchises, grants, authorizations, licenses,
         permits, easements, consents, certifications and orders are valid and
         in full force and effect.

                  (viii) To the best of such counsel's knowledge, neither the
         Company nor any of its subsidiaries is in violation of its respective
         charter or material provisions of by laws. To the best of such
         counsel's knowledge, neither the Company nor any of its subsidiaries
         is in breach of or otherwise in default in the performance of any
         material obligation, agreement or condition contained in any bond,
         debenture, note, indenture, loan agreement or any other material
         contract, lease or other instrument to which it is subject or by
         which any for them may be bound, or to which any of the material
         property or assets of the Company or any of its subsidiaries is
         subject.

                  (ix) The Registration Statement and the Prospectus, and any
         amendment thereof or supplement thereto (including any term sheet
         within the meaning of Rule 434 of the Rules and Regulations), comply as
         to form in all material respects with the requirements of the Act and
         the Rules and Regulations.

         In addition, such counsel shall state that in the course of the
preparation of the Registration Statement and the Prospectus, such counsel has
participated in conferences with officers and other representatives of the
Company, representatives of the independent accountants of the Company,
representatives of the Underwriters and representatives of counsel for the
Underwriters, at which the contents of the Registration Statement and the
Prospectus and related matters were discussed and at which such counsel inquired
of the representatives of the Company as to the materiality of the facts
disclosed to such counsel and, although such counsel does not pass upon, and
does not assume any responsibility for, the accuracy, completeness or fairness
of any statement contained in the Registration Statement or the Prospectus and
such counsel has made no independent check or verification thereof, based in
part upon the foregoing, (relying as to materiality to a large extent upon the
officers and representatives of the Company), no facts have come to such
counsel's attention that have led such counsel to believe that the Registration
Statement (except as to the financial statements and notes thereto and other
financial and statistical data included therein as to which such counsel need
not express any opinion or belief,) as of the date of effectiveness contained an
untrue statement of material fact or omitted to state any material fact required
to be stated therein or necessary in order to make the statements therein not
misleading or that the Prospectus (except as to the financial statements and the
notes thereto and other financial data included therein or excluded therefrom as
to which such counsel need not express any opinion or belief), as of its date or
as of the date of such opinion, contained or contains an untrue statement of
material fact or omitted or omits to state a material fact necessary in order to
make the

<PAGE>

statements therein, in light of the circumstances under which they were made,
not misleading. Notwithstanding anything herein to the contrary, it is
understood and agreed that other counsel to the Company are rendering opinions
with respect to (i) the sections of the Prospectus entitled "Risk Factors -
Risks Related to Our Business - If we are unable to protect our proprietary
technology, we may be unable to compete effectively." and "Business - Patents
and Proprietary Rights" and (ii) the sections of the Prospectus entitled "Risk
Factors - Risks Related to Our Business - If we fail to obtain regulatory
approval of our product candidates, or if regulatory approval is delayed for any
reason, we will be unable to commercialize and sell our products as we expect,"
and "Business--Government Regulation," and no opinions are expressed herein with
respect to such sections or matters.

         In rendering any such opinion, such counsel may state that such counsel
(i) expresses no opinion as to the laws of any jurisdiction other than the laws
of the State of New York, the Delaware General Corporation Law and the federal
laws of the United States, (ii) has assumed, without independent verification,
that the laws of the State of Minnesota are identical in all respects to the
laws of the State of New York, noting that the laws of the State of Minnesota
are likely to differ from the laws of the State of New York with respect to the
matters covered by such counsel's opinion, that even if such laws were the same
as the laws of the State of New York, judicial interpretations thereto in
Minnesota may differ from judicial interpretations by New York courts and that
such differences may be material, and (iii) expresses no opinions concerning the
Federal Food, Drug, and Cosmetic Act or related rules and regulations or any
intellectual property laws, statutes, rules or other regulation.

         In rendering such opinion such counsel may rely (i) as to matters of
law other than New York, Delaware and federal law, upon the opinion or opinions
of local counsel provided that the extent of such reliance is specified in such
opinion and that such counsel shall state that although such counsel is not
admitted to practice law in such jurisdiction, it has no reason to believe that
they and you are not entitled to rely on such opinion and (ii) as to matters of
fact, to the extent such counsel deems reasonable upon certificates of public
officials and officers of the Company and its subsidiaries provided that the
extent of such reliance is specified in such opinion.


         (e) On each Closing Date, there shall have been furnished to you, as
Representatives of the several Underwriters, the opinion of Mark Farber,
Esquire, special patent counsel for the Company, dated such Closing Date and
addressed to you, to the effect that:

            (i) such counsel represents the Company in certain matters relating
to intellectual property, including patents, and is familiar with the technology
used by the Company in its business and the manner of its use and has read the
portions of the Registration Statement and the Prospectus entitled
"BUSINESS--Patents and Proprietary Rights" and "RISK FACTORS--Risks Related to
Our Business--If we are unable to protect our proprietary technology, we may
not be able to compete effectively" (collectively, the "Patent Language");

            (ii) the Patent Language contains accurate descriptions of the
Company's Patents, Patent Applications and patents licensed to the Company and
the statements in the Patent Language therein insofar as such statements
constitute summaries of the legal matters, documents or proceedings referred to
therein, fairly present the information called for with respect to such legal
matters, documents and proceedings and fairly summarize the matters referred to
therein;

<PAGE>

            (iii) such counsel has reviewed the Company's Patent Applications
filed in the United States and outside the United States and in the opinion of
such counsel, the Company's Patent Applications have been properly prepared and
filed on behalf of the Company, and are being diligently pursued by the Company;
the inventions described in the Company's Patent Applications are assigned or
licensed to the Company; to such counsel's knowledge, no other entity or
individual has any right or claim in any Company inventions or Company's Patent
Applications made solely by the Company, or any patent to be issued therefrom,
and in such counsel's opinion each of the Company's Patent Applications
discloses patentable subject matter; to such counsel's knowledge, there are no
legal or governmental proceedings pending (other than those related to the
Patent Applications) relating to the Company, the claimed inventions of the
Company's Patents or the Company's Intellectual Property, and to such
counsel's knowledge, no such material proceedings are threatened or
contemplated by governmental authorities or others;

            (iv) such counsel has no knowledge of any facts which would preclude
the Company from having valid license rights or clear title to the Company's
Patents, and based on representations by the Company that no interests have been
conveyed to third parties which have not been recorded in the PTO, the Company
has clear record title to the Company's Patents free and clear of any liens or
encumbrances that have been recorded with the PTO;

            (v) to the best of such counsel's knowledge, the Company has
complied with the PTO duty of candor and disclosure for each of the Company's
patents, and such counsel has no knowledge that the Company lacks or will be
unable to obtain any rights or licenses to use all Intellectual Property
necessary for the conduct of its business as now proposed to be conducted by the
Company as described in the Prospectus,

            (vi) Except as disclosed in the Prospectus, such counsel has no
knowledge of any facts material to a determination of patentability regarding
the Company's Patent Applications not called to the attention of the PTO, and
is unaware of any facts not called to the attention of the PTO which would
preclude the grant of a patent for the Company's Patent Applications;

            (vii) Except as disclosed in the Prospectus, such counsel is not
aware of any basis for a finding of unenforceability or invalidity of any
Company Intellectual Property, and (except as disclosed in the Prospectus) to
the best of such counsel's knowledge, the Company has not received any notice
of infringement of or conflict with rights or claims of others with respect
to any Intellectual Property owned or used by the Company;

            (viii) based on a review of the third party rights made known to
counsel and discussion with Company scientific personnel, (except as disclosed
in the Prospectus) such counsel has no knowledge of any patent rights of others
which are or would be infringed by specific products or processes referred to in
the Prospectus, which infringement, singly or in the aggregate, if the subject
of an unfavorable decision, ruling or finding, would result in any material
adverse effect on the condition, financial or otherwise, or in the earnings,
business or operations of the Company; and

            (ix) such counsel (A) has no reason to believe that the Patent
Language contained in the Registration Statement and the Prospectus included
therein at the time the Registration Statement became effective 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
and (B) has no reason to believe that the Patent Language contained in the
Prospectus contains any untrue statement of a material fact or omits to state a
material fact necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading.
<PAGE>

         (f) On each Closing Date, there shall have been furnished to you, as
Representatives of the several Underwriters, the opinion of _________________,
special regulatory counsel for the Company, dated such Closing Date and
addressed to you, to the effect that:

            (i) such counsel represents the Company in certain matters relating
to the United States Federal Food, Drug and Cosmetic Act (the "FFDC Act") and
related governmental regulatory matters;

            (ii) such counsel is familiar with the products under development
and clinical testing by the Company and has read the portions of the
Registration Statement and Prospectus entitled "BUSINESS--Government Regulation"
and "RISK FACTORS-If we fail to obtain regulatory approval of our product
candidates, or if regulatory approval is delayed for any reason, we will be
unable to commercialize and sell our products" (collectively the "Regulatory
Language"), and in such counsel's opinion, insofar as the Regulatory Language
constitutes a description of the FFDC Act and FDA regulations or other
requirements, the Regulatory Language is accurate and complete in all material
respects and fairly presents such matters; and

            (iii) such counsel (A) has no reason to believe that the Regulatory
Language contained in the Registration Statement and the Prospectus included
therein at the time the Registration Statement became effective 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
and (B) has no reason to believe that the Regulatory Language contained in the
Prospectus contains any untrue statement of a material fact or omits to state a
material fact necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading.

         (g) On each Closing Date, there shall have been furnished to you, as
Representatives of the several Underwriters, such opinion or opinions from
Morgan, Lewis & Bockius LLP, counsel for the several Underwriters, dated such
Closing Date and addressed to you, with respect to the formation of the Company,
the validity of the Securities, the Registration Statement, the Prospectus and
other related matters as you reasonably may request, and such counsel shall have
received such papers and information as they request to enable them to pass upon
such matters.

         (h) On each Closing Date you, as Representatives of the several
Underwriters, shall have received a letter of Arthur Andersen LLP, dated such
Closing Date and addressed to you, confirming that they are independent public
accountants within the meaning of the Act and are in compliance with the
applicable requirements relating to the qualifications of accountants under Rule
2-01 of Regulation S-X of the Commission, and stating, as of the date of such
letter (or, with respect to matters involving changes or developments since the
respective dates as of which specified financial information is given in the
Prospectus, as of a date not more than five days prior to the date of such
letter), the conclusions and findings of said firm with respect to the financial
information and other matters covered by its letter delivered to you
concurrently with the execution of this Agreement, and the effect of the letter
so to be delivered on such Closing Date shall be to confirm the conclusions and
findings set forth in such prior letter.

         (i) On each Closing Date, there shall have been furnished to you, as
Representatives of the Underwriters, a certificate, dated such Closing Date and
addressed to you, signed by the chief executive officer and by the chief
financial officer of the Company, to the effect that:

<PAGE>

                  (i) The representations and warranties of the Company in this
         Agreement are true and correct, in all material respects, as if made at
         and as of such Closing Date, and the Company has complied with all the
         agreements and satisfied all the conditions on its part to be performed
         or satisfied at or prior to such Closing Date;

                  (ii) No stop order or other order suspending the effectiveness
         of the Registration Statement or any amendment thereof or the
         qualification of the Securities for offering or sale has been issued,
         and no proceeding for that purpose has been instituted or, to the best
         of their knowledge, is contemplated by the Commission or any state or
         regulatory body; and

                  (iii) The signers of said certificate have carefully examined
         the Registration Statement and the Prospectus, and any amendments
         thereof or supplements thereto (including any term sheet within the
         meaning of Rule 434 of the Rules and Regulations), and (A) such
         documents contain all statements and information required to be
         included therein, the Registration Statement, or any amendment thereof,
         does not contain any untrue statement of a material fact or omit to
         state any material fact required to be stated therein or necessary to
         make the statements therein not misleading, and the Prospectus, as
         amended or supplemented, does not include any untrue statement of
         material fact or omit to state a material fact necessary to make the
         statements therein, in light of the circumstances under which they were
         made, not misleading, (B) since the effective date of the Registration
         Statement, there has occurred no event required to be set forth in an
         amended or supplemented prospectus which has not been so set forth, (C)
         subsequent to the respective dates as of which information is given in
         the Registration Statement and the Prospectus, neither the Company nor
         any of its subsidiaries has incurred any material liabilities or
         obligations, direct or contingent, or entered into any material
         transactions, not in the ordinary course of business, or declared or
         paid any dividends or made any distribution of any kind with respect to
         its capital stock, and except as disclosed in the Prospectus, there has
         not been any change in the capital stock (other than a change in the
         number of outstanding shares of Common Stock due to the issuance of
         shares upon the exercise of outstanding options or warrants), or any
         material change in the short-term or long-term debt, or any issuance of
         options, warrants, convertible securities or other rights to purchase
         the capital stock, of the Company, or any of its subsidiaries, or any
         material adverse change or any development involving a prospective
         material adverse change (whether or not arising in the ordinary course
         of business), in the general affairs, condition (financial or
         otherwise), business, key personnel, property, net worth or results of
         operations of the Company and its subsidiaries, taken as a whole, and
         (D) except as stated in the Registration Statement and the Prospectus,
         there is not pending, or, to the knowledge of the Company, threatened
         or contemplated, any action, suit or proceeding to which the Company or
         any of its subsidiaries is a party before or by any court or
         governmental agency, authority or body, or any arbitrator, which might
         result in any material adverse change in the condition (financial or
         otherwise), business or results of operations of the Company and its
         subsidiaries, taken as a whole.

         (j) The Company shall have furnished to you and counsel for the
Underwriters such additional documents, certificates and evidence as you or they
may have reasonably requested.

         (k) All necessary filings shall have been made as required and all
filing fees shall have been paid to effect the listing of the Securities on the
Nasdaq National Market.

         All such opinions, certificates, letters and other documents will be in
compliance with the provisions hereof only if they are satisfactory in form and
substance to you and counsel for the


<PAGE>

Underwriters. The Company will furnish you with such conformed copies of such
opinions, certificates, letters and other documents as you shall reasonably
request.

         6. INDEMNIFICATION AND CONTRIBUTION.

         (a) The Company, agrees to 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 (including in
settlement of any litigation if such settlement is effected with the written
consent of the Company) 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 the
Registration Statement, including the information deemed to be a part of the
Registration Statement at the time of effectiveness pursuant to Rules 430A and
434(d) of the Rules and Regulations, if applicable, any Preliminary Prospectus,
the Prospectus, or any amendment or supplement thereto (including any term sheet
within the meaning of Rule 434 of the Rules and Regulations), 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 it in connection with investigating or defending against
such loss, claim, damage, liability or action; provided, however, that the
Company shall not be liable in any such case to the extent that any such loss,
claim, damage, liability or action arises out of or is based upon an untrue
statement or alleged untrue statement or omission or alleged omission made in
the Registration Statement, any Preliminary Prospectus, the Prospectus, or any
such amendment or supplement, in reliance upon and in conformity with written
information furnished to the Company by you, or by any Underwriter through you,
specifically for use in the preparation thereof.

         In addition to their other obligations under this Section 6(a), the
Company agrees that, as an interim measure during the pendency of any claim,
action, investigation, inquiry or other proceeding arising out of or based upon
any statement or omission, or any alleged statement or omission, described in
this Section 6(a), they will reimburse each Underwriter on a monthly basis for
all reasonable legal fees or other expenses incurred in connection with
investigating or defending any such claim, action, investigation, inquiry or
other proceeding, notwithstanding the absence of a judicial determination as to
the propriety and enforceability of the Company's obligation to reimburse the
Underwriters for such expenses and the possibility that such payments might
later be held to have been improper by a court of competent jurisdiction. To the
extent that any such interim reimbursement payment is so held to have been
improper, the Underwriter that received such payment shall promptly return it to
the party or parties that made such payment, together with interest, compounded
daily, determined on the basis of the prime rate (or other commercial lending
rate for borrowers of the highest credit standing) announced from time to time
by ____________________ (the "Prime Rate"). Any such interim reimbursement
payments which are not made to an Underwriter within 30 days of a request for
reimbursement shall bear interest at the Prime Rate from the date of such
request. This indemnity agreement shall be in addition to any liabilities which
the Company may otherwise have.

         (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 (including in settlement of any
litigation, if such settlement is effected with the written consent of such
Underwriter), 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 the Registration
Statement, any Preliminary Prospectus, the Prospectus, or any amendment or
supplement thereto (including any term sheet within the meaning of Rule 434 of
the Rules and Regulations), or arise out of or are based upon the omission or
alleged omission to state therein a material

<PAGE>

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 the Registration Statement, any Preliminary Prospectus, the Prospectus,
or any such amendment or supplement, in reliance upon and in conformity with
written information furnished to the Company by you, or by such Underwriter
through you, specifically for use in the preparation thereof, and will reimburse
the Company for any legal or other expenses reasonably incurred by the Company
in connection with investigating or defending against any such loss, claim,
damage, liability or action.

         (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 the indemnifying party from any liability that it may have to any
indemnified party. 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
in, 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, and after notice from the indemnifying
party to such indemnified party of the indemnifying party's election so to
assume the defense thereof, the indemnifying party shall not be liable to such
indemnified party under such subsection for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof other than reasonable costs of investigation; provided, however, that
if, in the sole judgment of the Representatives, it is advisable for the
Underwriters to be represented as a group by separate counsel, the
Representatives shall have the right to employ a single counsel to represent the
Representatives and all Underwriters who may be subject to liability arising
from any claim in respect of which indemnity may be sought by the Underwriters
under subsection (a) of this Section 6, in which event the reasonable fees and
expenses of such separate counsel shall be borne by the indemnifying party or
parties and reimbursed to the Underwriters as incurred (in accordance with the
provisions of the second paragraph in subsection (a) above). An indemnifying
party shall not be obligated under any settlement agreement relating to any
action under this Section 6 to which it has not agreed in writing.

         (d) If the indemnification provided for in this Section 6 is
unavailable or insufficient to hold harmless an indemnified party under
subsection (a) or (b) above, then each indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of the losses,
claims, damages or liabilities referred to in subsection (a) or (b) above, (i)
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 Securities or (ii) if the allocation provided by clause (i)
above is not permitted by applicable law, in such proportion as is appropriate
to reflect not only the relative benefits referred to in clause (i) above 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 that resulted in such
losses, claims, damages or liabilities, 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 or the Underwriters and the parties'
relevant intent, knowledge, access to information and opportunity to correct or
prevent such untrue statement or omission. The Company and the Underwriters
agree that it would not

<PAGE>

be just and equitable if contributions pursuant to this subsection (d) were to
be 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 in the first sentence
of this subsection (d). The amount paid by an indemnified party as a result of
the losses, claims, damages or liabilities referred to in the first sentence of
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 against any action or claim which is the subject of this subsection
(d). 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 Securities underwritten by it and distributed to the public
were offered to the public exceeds the amount of any damages that 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' 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 6 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 6 shall be in addition to any liability that the
respective Underwriters may otherwise have and shall extend, upon the same terms
and conditions, to each director of the Company (including any person who, with
his consent, is named in the Registration Statement as about to become a
director of the Company), to each officer of the Company who has signed the
Registration Statement and to each person, if any, who controls the Company
within the meaning of the Act.

         7. REPRESENTATIONS AND AGREEMENTS TO SURVIVE DELIVERY. All
representations, warranties, and agreements of the Company herein or in
certificates delivered pursuant hereto, and the agreements of the several
Underwriters and the Company contained in Section 6 hereof, shall remain
operative and in full force and effect regardless of any investigation made by
or on behalf of any Underwriter or any controlling person thereof, or the
Company or any of its officers, directors, or controlling persons, and shall
survive delivery of, and payment for, the Securities to and by the Underwriters
hereunder.

         8. SUBSTITUTION OF UNDERWRITERS.

            (a) If any Underwriter or Underwriters shall fail to take up and pay
for the amount of Firm Shares agreed by such Underwriter or Underwriters to be
purchased hereunder, upon tender of such Firm Shares in accordance with the
terms hereof, and the amount of Firm Shares not purchased does not aggregate
more than 10% of the total amount of Firm Shares set forth in Schedule I hereto,
the remaining Underwriters shall be obligated to take up and pay for (in
proportion to their respective underwriting obligations hereunder as set forth
in Schedule II hereto except as may otherwise be determined by you) the Firm
Shares that the withdrawing or defaulting Underwriters agreed but failed to
purchase.

            (b) If any Underwriter or Underwriters shall fail to take up and pay
for the amount of Firm Shares agreed by such Underwriter or Underwriters to be
purchased hereunder, upon tender of such Firm Shares in accordance with the
terms hereof, and the amount of Firm Shares not purchased aggregates more than
10% of the total amount of Firm Shares set forth in Schedule I hereto, and
arrangements satisfactory to you for the purchase of such Firm Shares by other
persons are not made within 36 hours thereafter, this Agreement shall terminate.
In the event of any such termination the

<PAGE>
Company shall not be under any liability to any Underwriter (except to the
extent provided in Section 4(a)(viii) and Section 6 hereof) nor shall any
Underwriter (other than an Underwriter who shall have failed, otherwise than
for some reason permitted under this Agreement, to purchase the amount of
Firm Shares agreed by such Underwriter to be purchased hereunder) be under
any liability to the Company (except to the extent provided in Section 6
hereof).

         If Firm Shares to which a default relates are to be purchased by the
non-defaulting Underwriters or by any other party or parties, the
Representatives or the Company shall have the right to postpone the First
Closing Date for not more than seven business days in order that the necessary
changes in the Registration Statement, Prospectus and any other documents, as
well as any other arrangements, may be effected. As used herein, the term
"Underwriter" includes any person substituted for an Underwriter under this
Section 8.

         9. EFFECTIVE DATE OF THIS AGREEMENT AND TERMINATION.

            (a) This Agreement shall become effective at 10:00 a.m., Eastern
time, on the effective date of the Registration Statement, or at such earlier
time after the effective time of the Registration Statement as you in your
discretion shall first release the Securities for sale to the public;
provided, that if the Registration Statement is effective at the time this
Agreement is executed, this Agreement shall become effective at such time as
you in your discretion shall first release the Securities for sale to the
public. For the purpose of this Section, the Securities shall be deemed to
have been released for sale to the public upon release by you of the
publication of a newspaper advertisement relating thereto or upon release by
you of telexes offering the Securities for sale to securities dealers,
whichever shall first occur. By giving notice as hereinafter specified before
the time this Agreement becomes effective, you, as Representatives of the
several Underwriters, or the Company may prevent this Agreement from becoming
effective without liability of any party to any other party, except that the
provisions of Section 4(a)(viii) and Section 6 hereof shall at all times be
effective.

            (b) You, as Representatives of the several Underwriters, shall have
the right to terminate this Agreement by giving notice as hereinafter
specified at any time at or prior to the First Closing Date, and the option
referred to in Section 3(b), if exercised, may be cancelled at any time prior
to the Second Closing Date, if (i) the Company shall have failed, refused or
been unable, at or prior to such Closing Date, to perform any agreement on
its part to be performed hereunder, (ii) any other condition of the
Underwriters' obligations hereunder is not fulfilled, (iii) trading on the
New York Stock Exchange or the American Stock Exchange shall have been wholly
suspended, (iv) minimum or maximum prices for trading shall have been fixed,
or maximum ranges for prices for securities shall have been required, on the
New York Stock Exchange or the American Stock Exchange, by such Exchange or
by order of the Commission or any other governmental authority having
jurisdiction, (v) a banking moratorium shall have been declared by Federal,
New York or **[other applicable states]authorities, or (vi) there has
occurred any material adverse change in the financial markets in the United
States or an outbreak of major hostilities (or an escalation thereof) in
which the United States is involved, a declaration of war by Congress, any
other substantial national or international calamity or any other event or
occurrence of a similar character shall have occurred since the execution of
this Agreement that, in your judgment, makes it impractical or inadvisable to
proceed with the completion of the sale of and payment for the Securities.
Any such termination shall be without liability of any party to any other
party except that the provisions of Section 4(a)(viii) and Section 6 hereof
shall at all times be effective.


<PAGE>

            (c) If you elect to prevent this Agreement from becoming effective
or to terminate this Agreement as provided in this Section, the Company shall be
notified promptly by you by telephone or telegram, confirmed by letter. If the
Company elects to prevent this Agreement from becoming effective, you shall be
notified by the Company by telephone or telegram, confirmed by letter.

         DEFAULT BY THE COMPANY. If the Company shall fail at the First Closing
Date to sell and deliver the number of Securities which it is obligated to sell
hereunder, then this Agreement shall terminate without any liability on the part
of any non-defaulting party.

            No action taken pursuant to this Section shall relieve the Company
from liability, if any, in respect of such default.

         10. INFORMATION FURNISHED BY UNDERWRITERS. The statements set forth in
the second to last paragraph of the cover page and under the caption
"Underwriting" in any Preliminary Prospectus and in the Prospectus constitute
the written information furnished by or on behalf of the Underwriters referred
to in Section 2 and Section 6 hereof.

         11. NOTICES. Except as otherwise provided herein, all communications
hereunder shall be in writing or by telegraph and, if to the Underwriters,
shall be mailed, telegraphed or delivered to the Representatives c/o U.S.
Bancorp Piper Jaffray, Piper Jaffray Tower, 222 South Ninth Street,
Minneapolis, Minnesota 55402, except that notices given to an Underwriter
pursuant to Section 6 hereof shall be sent to such Underwriter at the address
stated in the Underwriters' Questionnaire furnished by such Underwriter in
connection with this offering; if to the Company, shall be mailed,
telegraphed or delivered to it at 25 Science Park, New Haven, CT 06511
Attention: Leonard Bell; or to such other address as the person to be
notified may have requested in writing. All notices given by telegram shall
be promptly confirmed by letter. Any party to this Agreement may change such
address for notices by sending to the parties to this Agreement written
notice of a new address for such purpose.

         12. PERSONS ENTITLED TO BENEFIT OF AGREEMENT. This Agreement shall
inure to the benefit of and be binding upon the parties hereto and their
respective successors and assigns and the controlling persons, officers and
directors referred to in Section 6. Nothing in this Agreement is intended or
shall be construed to give to any other person, firm or corporation any legal or
equitable remedy or claim under or in respect of this Agreement or any provision
herein contained. The term "successors and assigns" as herein used shall not
include any purchaser, as such purchaser, of any of the Securities from any of
the several Underwriters.

         13. GOVERNING LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of Minnesota.

                            [Signature Page Follows]



<PAGE>


         Please sign and return to the Company the enclosed duplicates of this
letter whereupon this letter will become a binding agreement between the Company
and the several Underwriters in accordance with its terms.

                                      Very truly yours,

                                      ALEXION PHARMACEUTICALS, INC.


                                      By _____________________________
                                         Leonard Bell, M.D.
                                         President and Chief Executive Officer





Confirmed as of the date first
above mentioned, on behalf of
themselves and the other several
Underwriters named in Schedule I
hereto.

U.S. Bancorp Piper Jaffray


By
   Managing Director


Hambrecht & Quist LLC


By
     Managing Director


<PAGE>



                                   SCHEDULE I



UNDERWRITER                               NUMBER OF FIRM SHARES (1)
- -----------                               -------------------------












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

Total. . . . .. . . . . . . .
                                               ===============


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

(1)      The Underwriters may purchase up to an additional 375,000 Option
         Shares, to the extent the option described in Section 3(b) of the
         Agreement is exercised, in the proportions and in the manner described
         in the Agreement.

<PAGE>
                                                                     EXHIBIT 5.1


<TABLE>
<S>                       <C>                                        <C>
                                                                         HOUSTON
                                FULBRIGHT & JAWORSKI, L.L.P.         WASHINGTON, D.C.
TELEPHONE: 212/318-3000        A REGISTERED LIMITED LIABILITY             AUSTIN
FACSIMILE: 212/752-0969                  PARTNERSHIP                   SAN ANTONIO
                                      666 FIFTH AVENUE                    DALLAS
                                  NEW YORK, NEW YORK 10103               NEW YORK
                                                                       LOS ANGELES
                                                                          LONDON
                                                                        HONG KONG
</TABLE>


                                                               November 19, 1999

Alexion Pharmaceuticals, Inc.
25 Science Park, Suite 360
New Haven, Connecticut, 06511

Ladies and Gentlemen:

    In connection with Amendment No. 2 to the Registration Statement on
Form S-3 (the "Registration Statement") filed by Alexion Pharmaceuticals, Inc.,
a Delaware corporation (the "Company"), under the Securities Act of 1933, as
amended (the "Act"), relating to the public offering by the Company of up to
2,500,000 shares (the "Shares") of the Company's common stock, par value $.0001
per share ("Common Stock"), (including up to 375,000 shares of Common Stock
which will be purchased by the underwriters if the underwriters exercise the
option granted to them by the Company to cover over-allotments), we, as counsel
for the Company, have examined such corporate records, other documents and
questions of law as we have considered necessary or appropriate for the purposes
of this opinion. Our opinion set forth below is limited to the General
Corporation Law of the State of Delaware.

    We assume that appropriate action will be taken, prior to the offer and sale
of the Shares, to register and qualify the Shares for sale under all applicable
state securities or "blue sky" laws.

    In our examination of the foregoing documents, we have assumed the
genuineness of all signatures and the authenticity of all documents submitted to
us as originals, the conformity to original documents of all documents submitted
to us as certified or photostatic copies, and the authenticity of the originals
of such latter documents.

    Based on and subject to the foregoing, we advise you that in our opinion,
the Shares to be sold by the Company have been duly and validly authorized and,
when issued and sold in the manner contemplated by the Purchase Agreement, a
form of which has been filed as an exhibit to the Registration Statement (the
"Purchase Agreement"), and upon receipt by the Company of payment therefor as
provided in the Purchase Agreement, will be duly and validly authorized, legally
issued, fully paid and non-assessable.
<PAGE>
November 19, 1999
Page 2

    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and the reference to this firm under the caption "Legal
Matters" in the prospectus contained therein. This consent is not to be
construed as an admission that we are a party whose consent is required to be
filed with the Registration Statement under the provisions of the Act or the
rules and regulations of the Securities and Exchange Commission promulgated
thereunder. The opinion expressed herein is solely for your benefit, and may be
relied upon only by you.

                                          Very truly yours,
                                          /s/ Fulbright & Jaworski L.L.P.


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