ALEXION PHARMACEUTICALS INC
10-K/A, 1999-11-19
PHARMACEUTICAL PREPARATIONS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549
                            ------------------------


                                  FORM 10-K/A



<TABLE>
<C>        <S>
   /X/     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
           SECURITIES EXCHANGE ACT OF 1934
</TABLE>


                    FOR THE FISCAL YEAR ENDED JULY 31, 1999
                                       OR

<TABLE>
<C>        <S>
   / /     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
           SECURITIES EXCHANGE ACT OF 1934
</TABLE>

        FOR THE TRANSITION PERIOD FROM ______________ TO ______________

                        COMMISSION FILE NUMBER: 0-27756
                            ------------------------

                         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 No.)
Incorporation or Organization)
</TABLE>

                 25 SCIENCE PARK, NEW HAVEN, CONNECTICUT 06511
              (Address of Principal Executive Offices) (Zip Code)

                                  203-776-1790
              (Registrant's telephone number, including area code)

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

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: Common Stock, par
value $0.0001


    Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes / /  No /X/


    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. / /


    The aggregate market value of the Common Stock held by non-affiliates of the
registrant, based upon the last sale price of the Common Stock reported on the
National Association of Securities Dealers Automated Quotation (NASDAQ) National
Market System on November 17, 1999, was approximately $148,000,000.



    The number of shares of Common Stock outstanding as of November 17, 1999 was
11,331,947.


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<PAGE>
                                    PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND KEY EMPLOYEES.

    Set forth below is certain information regarding our executive officers,
directors and key employees:

<TABLE>
<CAPTION>
NAME                                          AGE                POSITION WITH ALEXION
- ----                                        --------             ---------------------
<S>                                         <C>        <C>
John H. Fried, Ph.D.(1)(2) ...............     70      Chairman of the Board of Directors
Leonard Bell, M.D.(1) ....................     41      President, Chief Executive Officer,
                                                       Secretary, Treasurer, Director
David W. Keiser...........................     48      Executive Vice President, Chief Operating
                                                       Officer
Louis A. Matis, M.D. .....................     49      Senior Vice President, Chief Scientific
                                                       Officer
Stephen P. Squinto, Ph.D. ................     43      Senior Vice President, Chief Technology
                                                       Officer
Barry P. Luke.............................     41      Vice President of Finance and
                                                       Administration, Assistant Secretary
Nancy Motola, Ph.D. ......................     47      Vice President of Regulatory Affairs and
                                                       Quality Assurance
James A. Wilkins, Ph.D. ..................     47      Vice President of Process Sciences and
                                                       Manufacturing
William Fodor, Ph.D.(3) ..................     41      Senior Director of Xenotransplantation
Christopher F. Mojcik, M.D., Ph.D.(3) ....     39      Senior Director of Clinical Development
Scott A. Rollins, Ph.D.(3) ...............     36      Senior Director of Project Management and
                                                       Drug Development
Jerry T. Jackson..........................     58      Director
Max Link, Ph.D.(1)(2) ....................     59      Director
Joseph A. Madri, Ph.D., M.D. .............     53      Director
Leonard Marks, Jr., Ph.D.(2) .............     78      Director
Eileen M. More............................     53      Director
R. Douglas Norby..........................     64      Director
Alvin S. Parven(2)........................     59      Director
</TABLE>

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

    (1)  Member of our nominating committee.


    (2)  Member of our audit committee and our compensation committee.



    (3)  Key employee.


    Each director will hold office until the next annual meeting of stockholders
and until his or her successor is elected and qualified or until his or her
earlier resignation or removal. Each officer serves at the discretion of the
board of directors. Each of our executive officers is a party to an employment
agreement with us.

    JOHN H. FRIED, PH.D. has been the Chairman of our board of directors of
Alexion since April 1992. Since 1992, Dr. Fried has been President of Fried &
Co., Inc., a health technology venture firm. Dr. Fried was a director of Syntex
Corp., a life sciences and health care company, from 1982 to 1994 and he served
as Vice Chairman of Syntex from 1985 to January 1993 and President of the Syntex
Research Division from 1976 to 1992. Dr. Fried has originated more than 200 U.S.
Patents and has authored more than 80 scientific publications. Dr. Fried
received his B.S. in Chemistry and Ph.D. in Organic Chemistry from Cornell
University.

    LEONARD BELL, M.D. is the principal founder of Alexion, and has been a
director of Alexion since February 1992 and the Company's President and Chief
Executive Officer, Secretary and Treasurer since January 1992. From 1991 to
1992, Dr. Bell was an Assistant Professor of Medicine and Pathology and

                                       1
<PAGE>
co-Director of the Program in Vascular Biology at the Yale University School of
Medicine. From 1990 to 1992, Dr. Bell was an attending physician at the Yale-New
Haven Hospital and an Assistant Professor in the Department of Internal Medicine
at the Yale University School of Medicine. Dr. Bell was the recipient of the
Physician Scientist Award from the National Institutes of Health and
Grant-in-Aid from the American Heart Association as well as various honors and
awards from academic and professional organizations. His work has resulted in
more than 20 scientific publications and three patent applications. Dr. Bell is
a director of the Connecticut Technology Council and Connecticut United for
Research Excellence, Inc. He also served as a director of the Biotechnology
Research and Development Corporation from 1993 to 1997. Dr. Bell received his
A.B. from Brown University and M.D. from Yale University School of Medicine.
Dr. Bell is currently an Adjunct Assistant Professor of Medicine and Pathology
at Yale University School of Medicine.

    DAVID W. KEISER has been Executive Vice President and Chief Operating
Officer of Alexion since July 1992. From 1990 to 1992, Mr. Keiser was Senior
Director of Asia Pacific Operations for G.D. Searle & Company Limited, a
manufacturer of pharmaceutical products. From 1986 to 1990, Mr. Keiser was
successively Licensing Manager, Director of Product Licensing and Senior
Director of Product Licensing for Searle. From 1984 to 1985, Mr. Keiser was New
Business Opportunities Manager for Mundipharma AG, a manufacturer of
pharmaceutical products, in Basel, Switzerland where he headed pharmaceutical
licensing and business development activities in Europe and the Far East. From
1978 to 1983, he was Area Manager for F. Hoffmann La Roche Ltd., a manufacturer
of pharmaceutical products, in Basel, Switzerland. Mr. Keiser received his B.A.
from Gettysburg College.

    LOUIS A. MATIS, M.D. has been the Senior Vice President and Chief Scientific
Officer since March 1998 and Vice President of Research, Immunobiology, of
Alexion from August 1994 to March 1998. From January 1993 to July 1994,
Dr. Matis served as the Director of our Program in Immunobiology. Prior to
joining Alexion, from 1977 to 1992, Dr. Matis held various appointments at the
NIH and the FDA. From 1990 to 1992, Dr. Matis was a Senior Investigator in the
Laboratory of Immunoregulation at the National Cancer Institute and from 1987 to
1990 he was a Senior Staff Fellow in the Molecular Immunology Laboratory at the
Center for Biologics Evaluation and Research associated with the FDA. Dr. Matis
is the author of more than 100 scientific papers in the fields of T-cell
biology. Dr. Matis has received numerous awards including the NIH Award of
Merit. Dr. Matis received his B.A. from Amherst College and M.D. from the
University of Pennsylvania Medical School.

    STEPHEN P. SQUINTO, PH.D. is a founder of Alexion and has held the positions
of Senior Vice President and Chief Technical Officer since March 1998, Vice
President of Research, Molecular Sciences, from August 1994 to March 1998,
Senior Director of Molecular Sciences from July 1993 to July 1994 and Director
of Molecular Development from April 1992 to July 1993. From 1989 to 1992,
Dr. Squinto held various positions at Regeneron Pharmaceuticals, Inc., most
recently serving as Senior Scientist and Assistant Head of the Discovery Group.
From 1986 to 1989, Dr. Squinto was an Assistant Professor of Biochemistry and
Molecular Biology at Louisiana State University Medical Center. Dr. Squinto's
work has led to over 70 scientific papers in the fields of gene regulation,
growth factor biology and gene transfer. Dr. Squinto's work is primarily in the
fields of regulation of eukaryotic gene expression, mammalian gene expression
systems and growth receptor and signal transduction biology. Dr. Squinto also
serves as a Director of the BRDC since 1997. Dr. Squinto received his B.A. in
Chemistry and Ph.D. in Biochemistry and Biophysics from Loyola University of
Chicago.

    BARRY P. LUKE has been Vice President of Finance and Administration since
September 1998 and Senior Director of Finance and Administration of Alexion from
August 1995 to September 1998 and prior thereto was Director of Finance and
Accounting of the Company from May 1993. From 1989 to 1993, Mr. Luke was Chief
Financial Officer, Secretary and Vice President--Finance and Administration at
Comtex Scientific Corporation, a publicly held distributor of electronic news
and business information. From 1985 to 1989, he was Controller and Treasurer of
Softstrip, Inc., a manufacturer of computer peripherals and

                                       2
<PAGE>
software. From 1980 to 1985, Mr. Luke was employed by the General Electric
Company where he held positions at GE's Corporate Audit Staff after completing
GE's Financial Management Program. Mr. Luke received a B.A. in Economics from
Yale University and an M.B.A. in management and marketing from the University of
Connecticut.

    NANCY MOTOLA, PH.D. has been the Vice President of Regulatory Affairs and
Quality Assurance since 1998. From 1991 to 1998, Dr. Motola served as Assistant,
Associate, and then Deputy Director, Regulatory Affairs for the Bayer
Corporation Pharmaceutical Division where she was responsible for regulatory
aspects of product development programs for cardiovascular, neuroscience,
metabolic and oncology drugs and included drugs targeting arthritis, cardiac
disorders, stroke and cognitive dysfunction. Dr. Motola has been responsible for
the filing of numerous INDs, other regulatory submissions and has filed New Drug
Applications for marketing approval resulting in three currently marketed drugs.
Dr. Motola held regulatory affairs positions of increasing responsibility at
Abbott Laboratories from 1989 to 1991 and at E.R. Squibb and Sons, Inc. from
1983 to 1989. She has also served as past Chairperson of the Regulatory Affairs
Section of the American Association of Pharmaceutical Scientists. Dr. Motola
received her B.A. from Central Connecticut State University and M.S. and Ph.D.
degrees in medicinal chemistry from the University of Rhode Island.

    JAMES A. WILKINS, PH.D. has been Vice President of Process Sciences and
Manufacturing of Alexion since September 1998 and has held the positions of
Senior Director of Process Sciences from August 1996 to September 1998, Senior
Director of Process Development from August 1995 to August 1996, and Director of
Process Development from September 1993 to August 1995. From 1989 to 1993,
Dr. Wilkins was Group Leader of the Protein Chemistry Department at Otsuka
America Pharmaceutical, Inc. From 1987 to 1989, Dr. Wilkins was a Scientist in
Recovery Process Development at Genentech, Inc. and from 1982 to 1987, he was an
Associate Research Scientist in the Thomas C. Jenkins Department of Biophysics
at Johns Hopkins University. He is the author of more than 25 presentations and
scientific articles in the fields of protein refolding and protein biochemistry.
Dr. Wilkins received a B.A. in Biology from University of Texas and a Ph.D. in
Biochemistry from University of Tennessee.

    WILLIAM FODOR, PH.D. has been Senior Director of Xenotransplantation since
1997. After joining Alexion in 1992, Dr. Fodor was a Staff Scientist from 1992
to 1994, Principal Scientist from 1994 to 1996, and Director of
Xenotransplantation from 1996 to 1997. Dr. Fodor has been responsible for
managing the preclinical development and manufacturing of our
xenotransplantation product candidates. Prior to 1992, Dr. Fodor was a
postdoctoral research fellow in the Section of Immunobiology at Yale University
School of Medicine and at Biogen, Inc., a biopharmaceutical firm. Dr. Fodor's
work has led to over 30 scientific papers and patents in the fields of
immunobiology and molecular biology. Dr. Fodor received his B.S. in Genetics and
Ph.D. in Molecular Genetics from the Ohio State University.

    CHRISTOPHER F. MOJCIK, M.D., PH.D. has been Senior Director of Clinical
Development since joining Alexion in July 1998. From 1996 until July 1998, he
was an Associate Director in the Metabolics/ Rheumatics Department at Bayer
Corporation's Pharmaceuticals Division. Dr. Mojcik was responsible for Phase II
and III development of certain arthritis programs and certain Phase IV programs
in cardiopulmonary bypass. From 1993 to 1996, he was a Senior Staff Fellow in
the Cellular Immunology Section of the Laboratory of Immunology in the NIAID at
the NIH. From 1991 to 1993, he completed his Fellowship in Rheumatology in the
National Institute of Arthritis and Musculoskeletal and Skin Diseases at the
NIH. He received his B.A. from Washington University in St. Louis, Missouri, and
his M.D. and Ph.D. from the University of Connecticut.

    SCOTT A. ROLLINS, PH.D. is a co-founder of Alexion and has been Senior
Director of Project Management and Drug Development since August 1999, Senior
Director of Complement Biology from 1997 to 1999, Director of Complement Biology
from 1996 to 1997, Principal Scientist from 1994 to 1996, and Staff Scientist
from 1992 to 1994. Since 1994, Dr. Rollins has been responsible for the
preclinical development of our anti-inflammatory compound 5G1.1-SC. Since 1999,
Dr. Rollins has been additionally responsible

                                       3
<PAGE>
for the project management functions of 5G1.1-SC, currently under joint
development with Procter & Gamble Pharmaceuticals. Prior to 1992, Dr. Rollins
was a postdoctoral research fellow in the Department of Immunobiology at Yale
University School of Medicine. Dr. Rollins' work has led to over 50 scientific
papers and patents in the fields of complement biology. He received his B.S. in
Cytotechnology and Ph.D. in Microbiology and Immunology from the University of
Oklahoma Health Sciences Center.

    JERRY T. JACKSON has been a director of Alexion since September 1999. He was
employed by Merck & Co. Inc., a major pharmaceutical company, from 1965 until
his retirement in 1995. During this time, he had extensive experience in sales,
marketing and corporate management, including joint ventures. From 1993 until
1995, Mr. Jackson served as Executive Vice President of Merck with broad
responsibilities for numerous operating groups--including Merck's International
Human Health, Worldwide Human Vaccines, the AgVet Division, Astra/Merck U.S.
Operations, as well as worldwide marketing. During 1993, he was also President
of the Worldwide Human Health Division in 1993. He served as Senior Vice
President of Merck from 1991 to 1992 responsible for Merck's Specialty Chemicals
and previously, he was President of Merck's Sharp & Dohme International.
Mr. Jackson serves as a director of Cor Therapeutics, Inc., Molecular
Biosystems, Inc., SunPharm Corporation, and Crescendo Pharmaceuticals
Corporation. Mr. Jackson received his B.A. from University of New Mexico.

    MAX LINK, PH.D. has been a director of Alexion since April 1992. From
May 1993 to June 1994, Dr. Link was Chief Executive Officer of Corange
(Bermuda), the parent company of Boehringer Mannheim Therapeutics, Boehringer
Mannheim Diagnostics and DePuy Orthopedics. From 1992 to 1993, Dr. Link was
Chairman of the Board of Sandoz Pharma, Ltd., a manufacturer of pharmaceutical
products. From 1987 to 1992, Dr. Link was the Chief Executive Officer of Sandoz
Pharma and a member of the Executive Board of Sandoz, Ltd., Basel. Prior to
1987, Dr. Link served in various capacities with the United States operations of
Sandoz, including as President and Chief Executive Officer. Dr. Link is also a
director of Protein Design Labs, Inc., Cell Therapeutics, Inc., and
Procept, Inc., each a publicly held pharmaceutical company, as well as Human
Genome Sciences Inc., a genomics company.

    JOSEPH A. MADRI, PH.D., M.D. is a founder of Alexion and has been a director
of Alexion since February 1992. Since 1980, Dr. Madri has been on the faculty of
the Yale University School of Medicine and is currently a Professor of
Pathology. Dr. Madri serves on the editorial boards of numerous scientific
journals and he is the author of over 175 scientific publications. Dr. Madri
works in the areas of regulation of angiogenesis, vascular cell-matrix
interactions, cell-cell interactions, lymphocyte-endothelial cell interactions
and endothelial and smooth muscle cell biology and has been awarded a Merit
award from the National Institutes of Health. Dr. Madri received his B.S. and
M.S. in Biology from St. John's University and M.D. and Ph.D. in Biological
Chemistry from Indiana University.

    LEONARD MARKS, JR., PH.D. has been a director of Alexion since April 1992.
Since 1985 Dr. Marks has served as an independent corporate director and
management consultant. Dr. Marks serves on the board of directors of Netvision
Technologies Inc. Dr. Marks served as a director of Airlease Management
Services, an aircraft leasing company (a subsidiary of Bank America Leasing &
Capital Corporation), from 1995 to March 1998, and Northern Trust Bank of
Arizona, a commercial and trust bank subsidiary of Northern Trust of Chicago,
from 1995 to March 1998. Prior to 1985, Dr. Marks held various positions in
academia and in the corporate sector including Executive Vice President,
Castle & Cooke, Inc. from 1972 to 1985. Dr. Marks received his B.A. in Economics
from Drew University and an M.B.A. and Doctorate in Business Administration from
Harvard University.

    EILEEN M. MORE has been a director of Alexion since December 1993. Ms. More
has been associated since 1978 with Oak Investment Partners and has been a
General Partner of Oak since 1980. Oak is a venture capital firm and a
stockholder of Alexion. Ms. More is currently a director of several private high
technology and biotechnology firms including OraPharma, Inc., Halox
Technologies, Psychiatric Solutions and Teloquent Communication Corporation.
Ms. More studied mathematics at the University of Bridgeport and is a Chartered
Financial Analyst.

                                       4
<PAGE>
    R. DOUGLAS NORBY has been a director of Alexion since September 1999. Since
1996, Mr. Norby has been the Executive Vice President and Chief Financial
Officer of LSI Logic Corporation, a semiconductor company, and he also serves on
the Board of LSI. From September 1993 until November 1996, he served as Senior
Vice President and Chief Financial Officer of Mentor Graphics Corporation, a
software company. Mr. Norby served as President of Pharmetrix Corporation, a
drug delivery company, from July 1992 to September 1993, and from 1985 to 1992,
he was President and Chief Operating Officer of Lucasfilm, Ltd., an
entertainment company. From 1979 to 1985, Mr. Norby was Senior Vice President
and Chief Financial Officer of Syntex Corporation, a pharmaceutical company.
Mr. Norby received a B.A. in Economics from Harvard University and an M.B.A.
from Harvard Business School.


    ALVIN S. PARVEN has been a director of Alexion since May 1999. Since 1997,
Mr. Parven has been President of ASP Associates, a management and strategic
consulting firm. From 1994 to 1997, Mr. Parven was Vice President at Aetna
Business Consulting, reporting to the Office of the Chairman of Aetna. From 1987
to 1994, Mr. Parven was Vice President, Operations at Aetna Health Plans. Prior
to 1987, he served in various capacities at Aetna including Vice President,
Pension Services from 1983 to 1987. Mr. Parven received his B.A. from
Northeastern University.


                                       5
<PAGE>
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

    The following table sets forth certain information with respect to the
beneficial ownership of our common stock as of October 1, 1999, except as
otherwise noted in the footnotes: (1) each person known by us to own
beneficially more than 5.0% percent of our outstanding common stock; (2) each
director and each named executive officer; and (3) all directors and executive
officers of Alexion as a group.


<TABLE>
<CAPTION>
                                                              NUMBER OF SHARES     PERCENTAGE OF
                                                                BENEFICIALLY           SHARES
NAME OF BENEFICIAL OWNER(1)                                       OWNED(2)       BENEFICIALLY OWNED
- ---------------------------                                   ----------------   ------------------
<S>                                                           <C>                <C>
BB Biotech AG
  Vordergrasse 3
  8200 Schaffhausen
  CH/Switzerland(3).........................................     1,824,113               16.1%
Scudder Kemper Investments, Inc.
  345 Park Avenue
  New York, NY 10154(4).....................................       869,500                7.6%

Zesiger Capital
  320 Park Avenue, 30th floor
  New York, NY 10022(5).....................................       845,000                7.5%

The Kaufmann Fund, Inc.
  140 E. 45th Street, 43rd floor
  New York, NY 10017(6).....................................       837,300                7.4%

T. Rowe Price Associates
  100 East Pratt Street
  Baltimore, MD 21205(7)....................................       828,600                7.3%

OrbiMed Advisers, Inc.
  41 Madison Avenue, 40th floor
  New York, NY 10010(8).....................................       750,500                6.6%

Leonard Bell, M.D.(9).......................................       583,850                5.0%
Stephen P. Squinto, Ph.D.(10)...............................       180,450                1.6%
David W. Keiser(11).........................................       167,300                1.5%
Louis A. Matis, M.D.(12)....................................       147,900                1.3%
Eileen M. More(13)..........................................       114,780                1.0 %
John H. Fried, Ph.D.(14)....................................        91,003                    *
James A. Wilkins, Ph.D.(15).................................        60,000                    *
Joseph A. Madri, Ph.D., M.D.(16)............................        57,467                    *
Max Link, Ph.D.(17).........................................        25,490                    *
Leonard Marks, Jr., Ph.D.(18)...............................        15,967                    *
Jerry T. Jackson(19)........................................            --                    *
R. Douglas Norby(20)........................................            --                    *
Alvin S. Parven(21).........................................            --                    *
Directors and Executive Officers as a group
  (15 persons)(22)..........................................     1,501,257               12.2%
</TABLE>


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

*   Less than one percent

(1) Unless otherwise indicated, the address of all persons is 25 Science Park,
    New Haven, Connecticut 06511.

(2) To our knowledge, except as set forth below, the persons named in the table
    have sole voting and investment power with respect to all shares of our
    common stock shown as beneficially owned by them, subject to community
    property laws where applicable and the information contained in the
    footnotes in this table.

                                       6
<PAGE>
(3) This figure is based upon information set forth in Amendment No. 3 to
    Schedule 13D filed on May 27, 1998, filed jointly by BB Biotech AG and
    Biotech Target, S.A. Biotech Target, S.A., a Panamanian corporation, is a
    wholly-owned subsidiary of BB Biotech AG. BB Biotech AG is a holding company
    incorporated in Switzerland.


(4) This figure is based upon information set forth in a Report on Form 13F as
    of June 30, 1999 filed with the SEC.



(5) This figure is based upon information set forth in Schedule 13G filed on
    January 21, 1999.



(6) This figure is based upon information set forth in Schedule 13G filed on
    August 20, 1999.


(7) This figure is based upon information set forth in Schedule 13G filed on
    February 5, 1999.

(8) This figure is based upon information set forth in Schedule 13G filed on
    March 25, 1999.

(9) Includes 423,750 shares of our common stock that may be acquired upon the
    exercise of options within 60 days of October 1, 1999 and 300 shares, in
    aggregate, held in the names of Dr. Bell's three minor children. Excludes
    161,250 shares obtainable through the exercise of options granted to
    Dr. Bell which are not exercisable within 60 days of October 1, 1999 and
    90,000 shares held in trust for Dr. Bell's children of which Dr. Bell
    disclaims beneficial ownership. Dr. Bell disclaims beneficial ownership of
    the shares held in the name of his minor children.

(10) Includes 123,750 shares of our common stock which may be acquired upon the
    exercise of options within 60 days of October 1, 1999 and 6,200 shares, in
    aggregate, held in the names of Dr. Squinto's two minor children of which
    6,000 shares are in two trusts managed by his wife. Excludes 58,750 shares
    obtainable through the exercise of options granted to Dr. Squinto which, are
    not exercisable within 60 days of October 1, 1999. Dr. Squinto disclaims
    beneficial ownership of the shares held in the name of his minor children
    and the foregoing trusts.

(11) Includes 125,000 shares of our common stock which may be acquired upon the
    exercise of options within 60 days of October 1, 1999 and 300 shares, in
    aggregate, held in the names of Mr. Keiser's three minor children. Excludes
    72,500 shares obtainable through the exercise of options granted to
    Mr. Keiser, which, are not exercisable within 60 days of October 1, 1999.
    Mr. Keiser disclaims beneficial ownership of the shares held in the name of
    his minor children.

(12) Includes 133,750 shares of our common stock which may be acquired upon the
    exercise of options granted to Dr. Matis within 60 days of October 1, 1999
    and 150 shares, in aggregate, held in the names of Dr. Matis' three minor
    children. Excludes 58,750 shares obtainable through the exercise of options,
    granted to Dr. Matis, which, are not exercisable within 60 days of
    October 1, 1999. Dr. Matis disclaims beneficial ownership of the shares held
    in the name of his minor children.

(13) Includes 27,467 shares of our common stock which may be acquired upon the
    exercise of options within 60 days of October 1, 1999 granted to Eileen
    More. Also includes 76,406 shares owned by Oak Investment V Partners and
    10,907 shares owned by Oak Investment V Affiliates, two affiliated limited
    partnerships. Ms. More is a General Partner of these entities. Excludes
    3,333 shares obtainable through the exercise of options granted to Ms. More
    which are not exercisable within 60 days of October 1, 1999.

(14) Includes 14,967 shares of our common stock that may be acquired on the
    exercise of options that are exercisable within 60 days of October 1, 1999.
    Excludes 3,333 shares obtainable through the exercise of options granted to
    Dr. Fried, which are not exercisable within 60 days of October 1, 1999.

(15) Excludes 45,000 shares obtainable through the exercise of options granted
    to Dr. Wilkins, which are not exercisable within 60 days of October 1, 1999.

(16) Includes 12,467 shares of our common stock that may be acquired upon the
    exercise of options within 60 days of October 1, 1999. Excludes 3,333 shares
    obtainable through the exercise of options granted to Dr. Madri, which are
    not exercisable within 60 days of October 1, 1999.

(17) Includes 167 shares of our common stock which, may be acquired upon the
    exercise of options within 60 days of October 1, 1999. Excludes 3,333 shares
    obtainable through the exercise of options, granted to Dr. Link, which are
    not exercisable within 60 days of October 1, 1999.

(18) Includes 14,967 shares of our common stock which, may be acquired upon the
    exercise of options within 60 days of October 1, 1999. Excludes 3,333 shares
    obtainable through the exercise of options granted to Dr. Marks, which are
    not exercisable within 60 days of October 1, 1999.

(19) Excludes 7,500 shares obtainable through the exercise of options granted to
    Mr. Jackson, which are not exercisable within 60 days of October 1, 1999.

(20) Excludes 7,500 shares obtainable through the exercise of options granted to
    Mr. Norby, which are not exercisable within 60 days of October 1, 1999.

(21) Excludes 7,500 shares obtainable through the exercise of options granted to
    Mr. Parven, which are not exercisable within 60 days of October 1, 1999.

(22) Consists of shares beneficially owned by Drs. Bell, Fried, Link, Madri,
    Marks, Matis, Motola, Squinto, and Wilkins, Messrs. Jackson, Keiser, Luke,
    Norby and Parven, and Ms. More. Includes 993,335 shares of our common stock
    which, may be acquired upon the exercise of options within 60 days of
    October 1, 1999.

                                       7
<PAGE>
                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

(A) (1)  FINANCIAL STATEMENTS:

    The financial statements required by this item are submitted in a separate
section beginning on page F-1 of this report.

    (2) FINANCIAL STATEMENT SCHEDULES:

    Schedules have been omitted because of the absence of conditions under which
they are required or because the required information is included in the
financial statements or notes thereto.

    (3) EXHIBITS:

<TABLE>
<C>                     <S>
          3.1           Certificate of Incorporation, as amended.*(1)

          3.2           Bylaws.*(1)

          4.1           Specimen Common Stock Certificate.*(1)

         10.1           Employment Agreement, dated April 1, 1997, between the
                        Company and Dr. Leonard Bell.*(2)

         10.2           Employment Agreement, dated October 22, 1997, between the
                        Company and David W. Keiser.*(3)

         10.3           Employment Agreement, dated October 22, 1997, between the
                        Company and Dr. Stephen P. Squinto.*(3)

         10.4           Employment Agreement, dated October 22, 1997, between the
                        Company and Dr. Louis A. Matis.*(3)

         10.5           Employment Agreement, dated July 1993, between the Company
                        and Dr. James A. Wilkins, as amended.*(1)

         10.6           Administrative Facility Lease, dated August 23, 1995,
                        between the Company and Science Park Development
                        Corporation.*(1)

         10.7           Research and Development Facility Lease, dated August 23,
                        1995, between the Company and Science Park Development
                        Corporation.*(1)

         10.8           Option Agreement, dated April 1, 1992 between the Company
                        and Dr. Leonard Bell.*(1)

         10.9           Company's 1992 Stock Option Plan, as amended.*(4)

        10.10           Company's 1992 Stock Option Plan for Outside Directors, as
                        amended.*(5)

        10.11           Form of Investor Rights Agreement, dated December 23, 1994,
                        between the Company and the purchasers of the Company's
                        Series A Preferred Stock, as amended.*(1)

        10.12           Exclusive License Agreement dated as of June 19, 1992 among
                        the Company, Yale University and Oklahoma Medical Research
                        Foundation.*(1)+

        10.13           License Agreement dated as of September 30, 1992 between the
                        Company and Yale University, as amended July 2, 1993.*(1)+

        10.14           License Agreement dated as of August 1, 1993 between the
                        Company and Biotechnology Research and Development
                        Corporation ("BRDC"), as amended as of July 1, 1995.*(1)+

        10.15           License Agreement dated January 25, 1994 between the Company
                        and The Austin Research Institute.*(1)+
</TABLE>

                                       8
<PAGE>

<TABLE>
<C>                     <S>
        10.16           Exclusive Patent License Agreement dated April 21, 1994
                        between the Company and the National Institutes of
                        Health.*(1)+

        10.17           License Agreement dated July 22, 1994 between the Company
                        and The Austin Research Institute.*(1)+

        10.18           License Agreement dated as of January 10, 1995 between the
                        Company and Yale University.*(1)+

        10.19           Advanced Technology Program ("ATP"), Cooperative Agreement
                        70NANB5H, National Institute of Standards and Technology,
                        entitled "Universal Donor Organs for Transplantation," dated
                        September 15, 1995.*(1)+

        10.20           U.S. Department of Health and Human Services, National
                        Heart, Lung and Book Institute, Small Business Research
                        Program, Phase II Grant Application, entitled "Role of
                        Complement Activation in Cardiopulmonary Bypass," dated
                        December 14, 1994; and Notice of Grant Award dated September
                        21, 1995.*(3)+

        10.21           Agreement to be Bound by Master Agreement dated as of August
                        1, 1993 between the Company and BRDC.*(1)

        10.22           Research and Development Facility Lease, dated April 1,
                        1996, between the Company and Science Park Development
                        Corporation.*(6)

        10.23           License Agreement dated March 27, 1996 between the Company
                        and Medical Research Council.*(6)+

        10.24           License Agreement dated May 8, 1996 between the Company and
                        Enzon, Inc.*(6)+

        10.25           Stock Purchase Agreement dated September 8, 1997 by and
                        between the Company and Biotech Target S.A. *(7)+

        10.26           Stock Purchase Agreement dated March 4, 1998 by and between
                        the Company and Biotech Target S.A. *(7)+

        10.27           Asset Purchase Agreement dated as of February 9, 1999
                        between the Company and United States Surgical Corporation.

        10.28           Collaboration Agreement dated January 25, 1999 between the
                        Company and The Procter & Gamble Company, as amended.+

        10.29           Letter agreement dated September 14, 1999 between the
                        Company and Leonard Bell.*(8)

         23.1           Consent of Arthur Andersen LLP.*(8)

         27.1           Financial Data Schedule.*(8)

         99.1           Risk Factors.*(8)
</TABLE>


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


*   Previously filed.


(1) Incorporated by reference to the Company's Registration Statement on
    Form S-1 (Reg. No. 333-00202).

(2) Incorporated by reference to the Company's Amendment No. 1 to Registration
    Statement on Form S-1 (Reg. No. 333-19905) filed on April 4, 1997.


(3) Incorporated by reference to the Company's Annual Report on Form 10-K for
    the fiscal year ended July 31, 1997.


(4) Incorporated by reference to the Company's Registration Statement on
    Form S-8 (Reg. No. 333-71879) filed on February 5, 1999.

                                       9
<PAGE>
(5) Incorporated by reference to the Company's Registration Statement on
    Form S-8 (Reg. No. 333-71985) filed on February 8, 1999.


(6) Incorporated by reference to the Company's Annual Report on Form 10-K for
    the fiscal year ended July 31, 1996.



(7) Incorporated by reference to the Company's Annual Report on Form 10-K for
    the fiscal year ended July 31, 1998.



(8) Incorporated by reference to the Company's Annual Report on Form 10-K for
    the fiscal year ended July 31, 1999.


+  Confidential treatment was granted for portions of such document.


(B) REPORTS ON FORM 8-K:


    Current Report on Form 8-K dated May 25, 1999 relating to the election of
Alvin S. Parven to the Company's Board of Directors.

    Current Report on Form 8-K dated September 24, 1999 relating to the election
of Jerry T. Jackson and R. Douglas Norby to the Company's Board of Directors.

(C) EXHIBITS:

    See (a) (3) above.

(D) FINANCIAL STATEMENT SCHEDULES:

    See (a) (2) above.

                                       10
<PAGE>
                                   SIGNATURES


    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this amended report to be
signed on its behalf by the undersigned, thereunto duly authorized.



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

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


                                       11

<PAGE>

                                                                  Exhibit 10.27

                            ASSET PURCHASE AGREEMENT

                                 by and between

                     UNITED STATES SURGICAL CORPORATION, and
                             CFC ASSETS CORPORATION

                                 as Sellers, and

                        COLUMBUS FARMING CORPORATION, and
                          ALEXION PHARMACEUTICALS, INC.

                                  as Purchasers

                          Dated as of February 9, 1999

<PAGE>

                     ASSET PURCHASE AND REVERSION AGREEMENT

This Asset Purchase and Reversion Agreement (the "Agreement"), dated as of
February 9, 1999, is by and between United States Surgical Corporation
(hereinafter "USSC"), a corporation organized and existing under the laws of
the State of Delaware and having principal offices at 150 Glover Avenue,
Norwalk, Connecticut, CFC Asset Corporation (hereinafter "CAC"), a
corporation organized and existing under the laws of the State of Delaware
and having principal offices at 150 Glover Avenue, Norwalk, Connecticut (USSC
and CAC hereinafter collectively referred to as the "Sellers"), and Alexion
Pharmaceuticals, Inc., a corporation organized and existing under the laws of
the State of Delaware and having its principal office at 25 Science Park,
Suite 360, New Haven, CT 06511 (hereinafter referred to as "Alexion"), and
Columbus Farming Corporation (hereinafter "CFC"), a corporation organized and
existing under the laws of the State of New York and having principal offices
at 304 Stone House Road, Sherburne, New York 13460 (Alexion and CFC
hereinafter collectively referred to as the "Purchasers") (Sellers and
Purchasers collectively hereinafter referred to as the "Parties").
Capitalized terms used in this Agreement shall have the meanings given to
them upon their first use or in Section 16 hereof.

                                   WITNESSETH

      WHEREAS, USSC has been engaged in the business of the design, manufacture,
distribution and/or sale of medical devices, and has invested in technologies in
the field of xenotransplantation; and

      WHEREAS, USSC holds licenses to certain intellectual property used by
Sellers in the said field; and

      WHEREAS, USSC and Alexion have worked cooperatively in the development of
such xenotransplantation technologies, but USSC has decided to concentrate on
certain core businesses and therefore Sellers desire to divest themselves of
their business, properties and assets heretofore or currently used in connection
with their xenotransplantation business (the "Business"); and

      WHEREAS, Sellers desire to sell and the CFC desires to buy, on the terms
and conditions set forth in this Agreement, the assets of the Business; and USSC
and Alexion have agreed that the licenses to certain intellectual property
granted by Alexion to USSC shall terminate and the technology and rights revert
to Alexion or shall otherwise be transferred to Alexion, all as set forth
herein.


                                                                               1
<PAGE>

      NOW, THEREFORE, in consideration of the premises and of the mutual
agreements hereinafter contained, the parties hereto agree as follows:

      Section 1. Purchase and Sale of Purchased Assets.

      (a) Subject to and upon the terms and conditions of this Agreement, the
Sellers covenant and agree to sell, assign, transfer and convey to the
Purchasers and the CFC agree to purchase from the Sellers, on the Closing Date
(as hereinafter defined), the assets of the Business which are listed below:

            (i) The land (with the buildings and improvements thereon) described
in Schedule l(a)(i) hereto which the Parties agree shall be conveyed to CFC as
of the Closing Date;

            (ii) All machinery and equipment, fixtures, furniture, furnishings,
tooting and instruments, which are used exclusively in the Business, including
without limitation, assets that are listed on Schedule l(a)(ii) hereto and any
other assets used exclusively in the Business acquired by the Sellers from the
date hereof to the Closing Date which the Parties agree shall be transferred to
CFC as of the Closing Date;

            (iii) All of the Sellers' inventories and supplies including,
without limitation, raw materials, work-in-process and finished goods related to
the Business, (the "Inventory" except that "Inventory," shall be deemed not to
include livestock and biological materials which is part of the "Licensed
Technology" (hereinafter defined)), and the Parties agree that the Inventory
shall be transferred to CFC as of the Closing Date;

            (iv) All Sellers' interest in the corporate name "Columbus Farming
Corporation", as well as CAC's post office box and telephone and facsimile
numbers shall be transferred to CFC as of the Closing Date;

            (v) All rights and privileges of the Sellers under and pursuant to
any contracts, leases, licenses, and agreements to the extent incident to and
relating exclusively to the Business, all of which in an amount greater than
$5,000 are listed in Schedule l(a)(v) hereto, and any such contracts, leases,
licenses and agreements which are entered into in the ordinary course of the
Business from the date hereof to the Closing Date, to the extent that such
contracts are uncompleted and outstanding because, in the case of purchase
contracts, services have not been rendered to the Sellers or products or
supplies have not been received by the Sellers prior to the Closing Date, and,
in the case of the sales contracts, products have not been shipped by the
Sellers prior to the Closing Date shall be transferred to CFC as of the Closing
Date;


                                                                               2
<PAGE>

            (vi) All supplier lists, books, records and papers (1) of the
Sellers relaxing exclusively to the Business; and (2) of CAC; shall be
transferred to CFC as of the Closing Date except to the extent they are part of
the "Licensed Technology".

      The items of property referred to in Sections l(a)(i) through l(a)(vi)
above, excluding the items described in Section 1(b) below, are hereinafter
collectively referred to as the "Purchased Assets".

      (b) Excluded Assets. "Licensed Technology" (hereinafter defined) is
excluded from the definition of "Purchased Assets". Excluded from this sale
and from the definition of "Purchased Assets" is (i) the Adpro microwave
transmitter and related equipment located at CAC's Sherburne, NY facility,
and ii) all know-how specific to Sellers bioabsorbable compositions
including, but not limited to, the chemistry, formulation or composition of
polymers developed, acquired or licensed by USSC, specifically including
those containing lysine diisocyanate (referred to as the "Bioabsorbable
Know-how").

      Section 2. Assumption of Liabilities: Termination of Prior Agreement.

      I. Assumption of Liabilities.

      (a) Except as set forth in Section 2 (b) below, CFC shall assume any and
all liabilities of the Sellers related exclusively to the Business set forth in
clauses (i), (ii), (iii) and (iv) below (collectively, the "Assumed
Liabilities"):

            (i) The obligations of the Sellers under the contracts described in
Schedule l(a)(v) and the contracts which are entered into in the ordinary course
of the Business and consistent with past practices from the date hereof to the
Closing Date to the extent that such contacts are uncompleted and outstanding
because, in the ease of purchase contracts, services have not been rendered to
the Sellers or products or supplies have not been received by the Sellers, as
the case may be, prior to the Closing Date and, in the case of sales contracts,
products have nor been shipped by the Sellers prior to the Closing Date;

            (ii) The obligations of USSC under National Institute of Standards
and Technology Cooperative Agreement No. 70NANB7H3065 (referred to as the "NIST
Agreement").

            (iii) The obligations and liabilities, including product
liabilities, relating to products manufactured or sold by Purchasers after the
date of Closing and relating to the Business.


                                                                               3
<PAGE>

            (iv) All other liabilities and obligations arising out of or
resulting from the conduct of the Business after the date of the Closing.

      (b) Accounts and other payables arising out of the conduct of the Business
are specifically not assumed by the Purchasers and will be paid by Sellers when
due.

      (c) (i) To the extent that the assignment of any contract or any license,
permit, approval or qualification issued or to be issued by any government or
agency or instrumentality thereof relating to the Business or the Purchased
Assets including, without limitation, the Permits (defined below) to be assigned
to the CFC or Alexion pursuant to this Agreement shall require the consent of
any other party, this Agreement shall not constitute a contract to assign the
same if an attempted assignment would constitute a breach thereof. The Sellers
shall use its reasonable commercial efforts, and the CFC or Alexion shall
cooperate where appropriate, to obtain any consent necessary to any such
assignment. If any such consent is not obtained, then the Sellers shall
cooperate with the CFC and Alexion in any reasonable arrangement requested by
CFC or Alexion designed to provide to the Purchasers the benefits under any such
contract license, permit, approval or qualification and the Permits, including
enforcement of any and all rights of the Sellers against the other party thereto
arising out of breach or cancellation thereof by such other party or otherwise.

            (ii) Seller agrees to cooperate to the extent reasonably necessary
to obtain approval of an Assignment of Seller's interest in the NIST Agreement
to Alexion. This includes, without limitation, executing of any letters
requested by Alexion directed to persons or entities designated by Alexion
indicating that Sellers will no longer involved in the performance of the NIST
Agreement and that the performance of its obligations will be undertaken by
Alexion. Sellers shall also execute any other letters Alexion reasonably
requires to obtain approval of the assignment of the NIST Agreement to Alexion.

      (d) Obligations of the Sellers relating to the Business but not assumed by
Purchasers herein shall constitute the "Excluded Liabilities", which shall
remain the responsibility of the Sellers after the Closing and shall not be
obligations of the Purchasers.

      II. Termination of Prior Agreement.

      (a) "Licensed Technology" shall mean:

            (i) To the extent that any transferable rights currently obtain, all
U.S. and foreign letters patent and patent applications of the Sellers
(including all licenses with respect thereto), and Sellers' right, title and
interest in all reissues, divisions, continuations-in-part, extensions thereof,
and any other U.S. or foreign letters patent or patent applications


                                                                               4
<PAGE>

claiming priority therefrom, and all licenses, technology, know-how, technical
information, inventions, research records and other documentation, formulae,
processes, techniques, technical information, manufacturing and engineering
drawings and information and trade secrets; as set forth in any of subsections A
and B, as follows:

                  (A) all that are being used exclusively in or relate
exclusively to the Business; and

                  (B) all that are listed on Schedule 2 II (a)(i) hereto;

            (ii) All rights and privileges of the Sellers under and pursuant to
the NIST Agreement, and all notebooks, data, knowledge and records (in whatever
media) relating to the research conducted under said NIST Agreement and all
results of the research conducted under said NIST Agreement (excluding
Bioabsorbable Know-how);

            (iii) livestock and biological materials; and

            (iv) all rights, privileges, licenses, and assets granted or
conveyed to USSC, including without limitation all licenses granted pursuant to
the Joint Development Agreement, all assets and rights transferred to USSC
pursuant to the Amendment to the Joint Development Agreement dated September 30,
1997, USSC Pigs referred to therein, and the Germline Constituents referred to
therein.

      (b) Alexion and USSC hereby terminate their Joint Development Agreement
dated as of July 31, 1995, as amended in the Amendment to Joint Development
Agreement dated September 30, 1997 and Amendment No. 2 to Joint Development
Agreement dated January 8, 1998 (as so amended, the "Joint Development
Agreement"), and shall at Closing execute mutual general releases releasing each
of them from any obligations whatsoever under or arising from said Joint
Development Agreement, as amended, except for the obligations set forth in
Article 5 thereof. It is the intention of the parties by this Agreement that the
Licensed Technology shall revert and are hereby transferred to and shall become
the sole and exclusive property of Alexion, and USSC shall have no further
rights or obligations with respect thereto other than the obligations set forth
in Article 5 of the Joint Development Agreement.

      (c) To the extent that Sellers have any interest in any of the Licensed
Technology which does not revert to Alexion as a result the termination of the
Joint Development Agreement, the same shall nevertheless be deemed transferred
and assigned to Alexion as of the Closing Date.


                                                                               5
<PAGE>

      Section 3. Purchase Price.

      Subject to and upon the terms and conditions of this Agreement, and as
full and complete consideration for the sale of the assets set forth herein,
Purchasers hereby agrees to pay to USSC $3,920,307.96 PLUS the assumption of
the Assumed Liabilities (the "Purchase Price"). Notwithstanding anything in
this Agreement to the contrary, no portion of the Purchase Price shall be
deemed payable by Alexion, and no portion of the Purchase Price shall be
deemed allocable to any property reverting, transferred, or to be transferred
to Alexion pursuant to this Agreement.

      Section 4. Closing and Payment of Purchase Price.

      (a) A closing (the "Closing") shall take place at 10:00 a.m. on February
9, 1999 at the offices of the Sellers at 150 Glover Avenue, Norwalk, CT 06851
(the "Closing Date").

      (b) (i) On the Closing Date, the Sellers shall transfer to CFC by all
necessary and appropriate bills of sale, deeds, assignments and other
instruments, all right, title and interest of the Sellers in and to the
Purchased Assets (and the Licensed Technology shall revert to and be transferred
and assigned to Alexion) free and clear of all Liens, claims and encumbrances
whatsoever (other than the "Irwin Lien", as hereinafter defined), and CFC shall
deliver to USSC a promissory note (the "Note") in the amount of $3,920,307.96
(the form of which is attached hereto as Exhibit B), a mortgage on the real
estate portion of the Purchased Assets (the form of which is attached hereto as
Exhibit C), and a security agreement and appropriate UCC financing statements on
the tangible personal property portion of the Purchased Assets (the forms of
which are attached hereto as Exhibits D and E).

            (ii) UCC # 990050 in which the secured party is the United
States of America c/o Farm Service Agency is referred to as the "Irwin Lien."
Sellers covenant that Sellers, at Sellers' sole cost and expense, will cause
the Irwin Lien to be removed from the Purchased Assets on or before the
sixtieth day after the Closing Date unless CFC, in its sole discretion,
agrees that the Irwin Lien may remain in connection with an agreement reached
between CFC and the debtors described in the Irwin Lien.

            (iii) If a certificate of occupancy has not yet been issued for any
building or improvement on the real property described on Schedule l(a)(i),
Sellers shall, at Sellers' sole cost and expense, cause it to be issued on or
before the sixtieth day after the date of this Agreement.


                                                                               6
<PAGE>

      (c) On or before the date of the Closing, the Sellers shall:

            (i) deliver to the Purchasers at the Sellers' Sherburne, New York
facility physical possession of all tangible Purchased Assets of the Business
and Licensed Technology located therein;

            (ii) make available for pick-up by the Buyers such of the Purchased
Assets as are located at USSC's facility in North Haven, Connecticut;

            (iii) if CFC has so requested, deliver letters to third parties from
whom CAC has contracted for goods and services indicating that the contracts
have been assigned to CFC and indicating that rights and warranties of CAC have
been assigned to CFC;

            (iv) deliver share of stock of Agway, Inc. properly transferred to
CFC free and clear of all Liens;

            (v) deliver titles to any vehicles, machinery or equipment for which
titles have been issued which are part of the Purchased Assets properly
transferred to CFC; and

            (vi) deliver any additional documents and make any payments as are
required to transfer title from Sellers to Purchasers of any Purchased Assets
and Licensed Technology as required pursuant to this Agreement fully paid and
free and clear of any liens and encumbrances (except with respect to the Irwin
Lien).

            (vii) deliver the "Estimated Payables Amount" reflected on Schedule
4(e)(vii) to the trust account of Purchasers' attorneys', Golenbock, Eiseman,
Assor & Bell via wire transfer. Purchasers attorneys shall be deemed authorized
to disburse the "Estimated Payables Amount" to CFC on the date of the Closing
and thereafter shall be free of any and all responsibilities with respect to
such amount.

      (d) (i) Schedule 4(c)(vii) sets forth all of the payables which Sellers
have estimated as arising from the purchase of assets by Sellers in connection
with the Business on or before the date of the Closing and the operation of the
Business on or before the date of the Closing. CFC shall apply the Estimated
Payables Amount to the payment of the payables of CAC and/or USSC arising from
the purchase of assets by one or both of them in connection with the Business on
or before the date of the Closing and the operation of the Business on or before
the date of the Closing. CFC may also elect to pay such payables out of its own
funds, but CFC is not obligated to do so. To the extent such payables are paid
by CFC out of its own funds, the payment shall be reimbursed by Sellers.
Notwithstanding anything herein to the contrary, Purchasers do not


                                                                               7
<PAGE>

assume responsibility for the payment of any of the payables of Sellers except
to the extent CFC has agreed to apply the Estimated Payables Amount received by
it to the payables. If the Estimated Payables Amount is insufficient to pay such
payables, Sellers agree to pay the balance of the payables and to reimburse CFC
for any portion of the balance paid by CFC except for the payables to
Lok-n-Log, Double L Group, and Cool Care Mechanical.

            (ii) On or before the sixtieth day after the date of the Closing
(the "Reconciliation Date") CFC shall submit to Sellers a schedule of the
payments made from the Estimated Payables Amount and the bills as CFC shall have
received supporting the payments made. If the aggregate of the amounts paid by
CFC on account of the payables is less than the Estimated Payables Amount, CFC
shall pay USSC the difference on or before the tenth day after the
Reconciliation Date. If the aggregate of the amounts paid by CFC on account of
the payables is more than the Estimated Payables Amount, USSC shall pay CFC the
difference on or before the tenth day after the Reconciliation Date. If USSC
fails to pay CFC any amounts owed CFC in accordance with this subsection (d),
the same shall be a credit to CFC which CFC may apply against payments due USSC
pursuant to the Note until the credit has been exhausted.

      (e) As of the date of the Closing, all warranties inuring to the benefit
of CAC from any contractors, manufacturers, and/or suppliers shall be deemed
assigned to CFC. At any time after the date of the Closing, if CFC so requests,
Sellers shall deliver letters to third parties from whom CAC has contracted for
goods and services in connection with the Business indicating that the contracts
have been assigned to CFC and indicating that rights and warranties of CAC have
been assigned to CFC.

      Section 5. Representations and Warranties of the Sellers.

      The Sellers hereby represent and warrant to the Purchasers as follows:

      (a) Due Organization: The Sellers are corporations duly organized, validly
existing and in good standing under the laws of the state of Delaware, with all
requisite power and authority to own, lease and operate their properties, to
carry on their businesses as presently conducted by them, to enter into this
Agreement and the other instruments and agreements of the Sellers provided for
herein, and to consummate the transactions contemplated hereby and thereby.

      (b) Authorization. The execution and delivery by the Sellers of this
Agreement and the other instruments and agreements of the Sellers provided for
herein, and the performance of their obligations hereunder and thereunder, have
been duly and validly authorized by all necessary action on their parts, and
this Agreement and all other such instruments and agreements delivered or to be
delivered by the Sellers in connection wit the transactions


                                                                               8
<PAGE>

contemplated hereby are, or (when executed and delivered in accordance herewith)
will be, the legal, valid and binding obligations of the Sellers, enforceable
against them in accordance with their respective terms.

      (c) Non-Contravention. Neither the execution and delivery by the Sellers
of this Agreement, nor the performance by them of their obligations hereunder
and thereunder will, or with the giving of notice or the lapse of time, or both,
would:

            (i) conflict with, result in a breach of, or constitute a default
under, any provision of the organizational documents of the Sellers or of any
contract, indenture, lease, sublease, loan agreement, restriction, Lien or other
obligation or liability to which the Sellers are parties or by which either of
them are bound, or result in or create in any party the right to accelerate,
terminate, modify or cancel any contract, license, indenture, lease, sublease or
loan agreement to which the Sellers are parties or by which they, or any of
their properties or assets, is affected or bound;

            (ii) violate any order, writ, injunction, decree, law, statute, rule
or regulation applicable to the Sellers; or

            (iii) result in the creation or imposition of any Lien upon any of
the Purchased Assets or Licensed Technology.

      (d) Asset Listing. The Sellers have delivered to the Purchasers a true and
complete listing of the purchase price of the machinery and equipment related to
the Business dated December 31, 1998 (the "Asset Listing"), which is attached
hereto as Exhibit A. The Asset Listing has been prepared from the books and
records of the Sellers and fairly presents such assets at the specified date,
and there have been no material changes in such Asset Listing since said date.

      (e) Title to Purchased Assets; Condition of Purchased Assets. The Sellers
have good and marketable title to and possession of all the Purchased Assets and
the Licensed Technology, free and clear of all Liens; and, to the best of
Sellers' knowledge and belief, no interest in or right to any such Purchased
Assets or the Licensed Technology is held, legally or beneficially by any person
or entity other than the Sellers. Purchased Assets have been properly maintained
and are in good operating condition, reasonable wear and tear excepted, and
there exists no outstanding notice of any violation of any statute relating to
them or to the Licensed Technology.

      (g) Intellectual Property. Schedule 2 II (a)(i) sets forth a complete and
accurate list of all of the United States and foreign patents, and/or
applications therefor that are owned, possessed or held by the Sellers and used
in the conduct of the Business (the "Intellectual


                                                                               9
<PAGE>

Property"). Unless otherwise indicated in such Schedule 2 II (a)(i), to the best
of Sellers' knowledge and belief, the Sellers exclusively owns the entire right,
title and interest in and to each item of Intellectual Property free and clear
of the rights of any other persons or entities (other than Purchasers).

      (h) Contracts. Schedule 1(a)(v) lists all material contracts, leases,
agreements, letters of intent and commitments, whether written or oral, of an
amount equal to or greater than $5,000, to which the Sellers are a party or by
which the Sellers or any of the Purchased Assets or the Licensed Technology are
bound and which relate to the conduct of the Business (collectively, the
"Contracts"). Except as set forth in such Schedule 1(a)(v), (i) all of the
Contracts were entered into in the ordinary course of the Business, (ii) all of
the Contracts are currently in full force and effect, binding upon the parties
thereto, and enforceable against them in accordance with their terms, (iii) to
the best of Sellers' knowledge, the Sellers are complying in full with the terms
and provisions thereof, (iv) to the best knowledge of the Sellers, the other
parties to all of the Contracts are complying in full with the terms and
provisions thereof, (v) there are no progress payments, advances, or arrearages
in connection with any of the Contacts except as set forth on Schedule 1 (a)(v),
and (vi) the consummation of the transactions contemplated hereby will not
impair any right or privilege enjoyed by the Sellers or the Purchasers under any
Contract, or give rise to any right of termination or cancellation thereunder or
diminution of rights.

      (i) Consents of Third Parties. No consent, approval or agreement of any
Person, party, court, government or entity is required to be obtained by the
Sellers in connection with the execution and delivery of this Agreement or the
other instruments or agreements provided herein or therein, or the consummation
of the transactions contemplated hereby or thereby.

      (j) Litigation. There is no litigation, arbitration, claim, governmental
or other investigation or proceeding (formal or informal) pending or, to the
best knowledge of the Sellers, threatened with respect to the Business, or the
Purchased Assets, or the Licensed Technology, or the transactions contemplated
hereby and to the best knowledge of the Sellers there exists no basis or grounds
for any of the foregoing. To the best knowledge of the Sellers, the Sellers are
not in violation of, or in default with respect to, any order, judgment or
decree applicable to the Business or the Purchased Assets or the Licensed
Technology, and are not required to take any remedial action in order to avoid
such violation or default.

      (k) Legal Matters. The Sellers are in compliance with all applicable laws,
including, without limitation, all environmental laws and other laws and
regulations of governmental agencies in connection with the Business and the
real property described in Schedule 1 (a)(i) and the buildings and improvements
thereon, except for any failure to comply which individually or in the aggregate
would not have a material adverse effect on the business, properties, assets or
condition (financial or otherwise) of CAC or CFC.


                                                                              10
<PAGE>

      (l) No Broker. No agent, broker, person or firm acting on behalf of the
Sellers, or under its authority, is or will be entitled to a financial advisory
fee, brokerage commission, finder's fee or like payment in connection with this
Agreement or any of the transactions contemplated hereby.

      (m) New York Lien Law. Seller shall comply wit its obligations pursuant to
Section 13 of the New York Lien Law.

      (n) NIST Agreement. Sellers have received no notice of default with
respect to the NIST Agreement, and to the best of Seller's knowledge, Sellers
are not in default of any of their obligations pursuant to the NIST Agreement.

      (o) Franchise Taxes. All franchise taxes due to date for USSC and CAC have
been paid to date. If they have not, Sellers promise to pay them.

      (p) Certificates of Occupancy. All work performed in connection with
any construction on the real property described on Schedule l(a)(i),
including without limitation, work performed by Westcott Simpson and its
subcontractors and materials supplied by its materialmen have as been fully
completed and paid for.

      (q) Liens. The Licensed Technology and the Purchased Assets are not
subject to any lien or security interest (excluding the Irwin Lien).

      (r) Residents. No person resides or has the right to reside on the real
property described on Schedule 1(a)(i) except that John Roma, an employee of
CAC, has been required to live on the real property as a part of his
employment through the date of this Closing. John Roma has no tenancy in or
continuing right to reside on the real property after the termination of his
employment by CAC as of the Closing Date.

      Section 6. Representations and Warranties of the Purchasers. The
Purchasers represents and warrants to the Sellers as follows:

      (a) Due Organization. Alexion is a corporation duly organized, validly
existing and in good standing under the laws of Delaware with all requisite
corporate power and authority to enter into this Agreement and the other
instruments and agreements to be delivered by it hereunder, and to consummate
the transactions contemplated hereby and thereby. CFC is a corporation duly
organized, validly existing and in good standing under the laws of New York


                                                                              11
<PAGE>

with all requisite corporate power and authority to enter into this Agreement
and the other instruments and agreements to be delivered by it hereunder, and to
consummate the transactions contemplated hereby and thereby.

      (b) Authorization. The execution and delivery by the Purchasers of this
Agreement and the other instruments and agreements of the Purchasers provided
for herein, and the performance of their obligations hereunder and thereunder,
have been duly and validly authorized by all necessary action on their parts,
and this Agreement and all other such instruments and agreements delivered or to
be delivered by the Purchasers in connection with the transactions contemplated
hereby are, or (when executed and delivered in accordance herewith) will be, the
legal, valid and binding obligations of the Purchasers, enforceable against them
in accordance with their respective terms.

      (c) Non-Contravention. Neither the execution and delivery of this
Agreement by the Purchasers nor the performance by the Purchasers of their
obligations hereunder and thereunder will, or with the giving of notice or the
lapse of time, or both, would:

            (i) conflict with, result in a breach of, or constitute a default
under, any provision of the Purchasers' charters or by-laws, or of any contract,
indenture, lease, sublease, loan agreement, Lien or other obligation or
liability to which the Purchasers are parties or by which they are bound; or

            (ii) violate any order, writ, injunction, decree, law, statute, rule
or regulation applicable to or by which they or their properties are bound.

      (d) Litigation. There is no litigation, arbitration, claim, governmental
or other investigation or proceeding (formal or informal) involving the
transactions contemplated hereby pending or, to the best knowledge of the
Purchasers, threatened, against the Purchasers and to the best knowledge of the
Purchasers there exists no bases or grounds for any of the foregoing.

      (e) No Broker. No agent broker, person or firm acting on behalf of the
Purchasers or under their authority, is or will be entitled to a financial
advisory fee, brokerage commission, finder's fee or like payment in connection
with this Agreement or any of the transactions contemplated hereby.

      (f) Consents of Third Parties. No consent, approval or agreement of any
Person, party, court, government or entity is required to be obtained by the
Purchasers in connection with the execution and delivery of this Agreement, or
the other instruments and agreements provided herein or the consummation of the
transactions contemplated hereby.


                                                                              12
<PAGE>

      Section 7. Covenants of the Sellers Pending the Closing.

      The Sellers covenant and agree that between the date of this Agreement and
the Closing or termination of this Agreement prior to Closing:

      (a) The Sellers will not take any action, or omit to take any action,
which action or omission would make any of the representations and warranties of
the Sellers untrue or incorrect in any material respect at the Closing Date, and
will not undertake any course of action inconsistent with this Agreement, or
which would render any of the conditions to Closing by the Purchasers unable to
be satisfied at or prior to the Closing Date.

      (b) The Purchasers and their officers, employees, and other agents,
including accountants and counsel, shall have reasonable access to all of the
books of account, records, permits, franchises, plans and other business records
of the Sellers, at reasonable times during business hours, for the purpose of
examining and inspecting the same and making copies of and extracts from such
records and documents.

      (c) The Sellers will carry on the Business in the ordinary course,
consistent with past practice. The Sellers will make no material change in the
Purchased Assets or Licensed Technology, its business, contracts, accounting
practices, methods of operation or management of its business and properties
relating to the Business without the Purchasers' prior written consent.

      (d) The Sellers will use all reasonable efforts to (i) promptly make all
filings and seek to obtain all authorizations required under the Sellers'
Contracts and applicable laws with respect to the transactions contemplated
hereby and will cooperate with the Purchasers with respect thereto, (ii)
promptly take or cause to be taken all other actions necessary, proper or
appropriate to satisfy the conditions set forth in Section 9 and to consummate
and make effective the transactions contemplated by this Agreement on the terms
and conditions set forth herein and therein as soon as practicable, and (iii)
not take any action that would reasonably be expected to impair the ability of
the Sellers to consummate the transactions contemplated by this Agreement at the
earliest practicable time, including without limitation any action that would
impair efforts to secure any required authorizations for such transactions. The
reasonable efforts of the Sellers shall include, without limitation, good faith
response, in cooperation with the Purchasers, to all requests for information,
documentary or otherwise, by any governmental agency.

      Section 8. Covenants of the Purchasers Pending the Closing.

      The Purchasers hereby covenant and agree that between the date of this
Agreement and the Closing or termination of this Agreement prior to the Closing:


                                                                              13
<PAGE>

      (a) The Purchasers will not take any action, or omit to take any action,
which action or omission would make any of their representations and warranties
untrue or incorrect in any material respect at the Closing Date, and will not
undertake any course of action inconsistent with this Agreement, or which would
render any of the conditions to Closing by the Sellers unable to be satisfied at
or prior to the Closing Date.

      (b) The Purchasers will use all reasonable efforts to (i) promptly make
all filings and seek to obtain all authorizations required to be made by the
Purchasers under applicable laws with respect to the transactions contemplated
hereby and will cooperate with the Sellers with respect thereto, (ii) promptly
take or cause to be taken all other actions necessary, proper or appropriate to
satisfy the conditions set forth in Section 10 and to consummate and make
effective the transactions contemplated by this Agreement on the terms and
conditions set forth herein and therein as soon as practicable, and (iii) not
take any action that would reasonably be expected to impair their ability to
consummate the transactions contemplated by this Agreement at the earliest
practicable time, including without limitation any action that would impair
efforts to secure any required authorizations for such transactions. The
reasonable efforts of the Purchasers shall include, without limitation, good
faith response, in cooperation with the Sellers, to all requests for
information, documentary or otherwise, by any governmental agency.

      Section 9. Conditions Precedent to Closing by the Sellers.

      The obligations of the Sellers to sell the Purchased Assets and to
consummate the transactions contemplated hereby are subject, at their sole
option, to the fulfillment prior to or at the Closing of each of the following
conditions:

      (a) All of the representations and warranties made by the Purchasers in
this Agreement shall be true and correct in all respects both on and as of the
date of this Agreement and on and as of the Closing Date.

      (b) The Purchasers shall have delivered the consideration set forth in
Section 4(b)(i) to the Sellers.

      (c) All consents, approvals, authorizations and registrations,
qualifications or filings, required to have been made or obtained by the
Purchasers to permit the consummation by the purchasers of the transactions
contemplated hereby shall have been made or obtained, and all required
authorizations, consents and approvals of third parties to permit the
consummation of the transactions contemplated hereby shall have been obtained.


                                                                              14
<PAGE>

      (d) No action or proceeding before a court or other governmental body
shall have been instituted or threatened by any government or agency thereof, or
by any other third party, to restrain or prohibit the consummation of any of the
transactions contemplated hereby.

      Section 10. Conditions Precedent to Closing by the Purchasers.

      The obligations of the Purchasers to purchase the Purchased Assets and to
consummate the transactions contemplated hereby are subject, at its sole option,
to the fulfillment prior to or at the Closing of each of the following
conditions:

      (a) All of the representations and warranties made by the Sellers in this
Agreement shall be true and correct in all respects both on and as of the date
of this Agreement and on and as of the Closing Date.

      (b) All consents, approvals and authorizations and registrations,
qualifications or filings, required to have been made or obtained by the Sellers
to permit the consummation by the Sellers of the transactions contemplated
hereby shall have been made or obtained, and all required authorizations,
consents and approvals of third parties to permit the consummation by the
Sellers of the transactions contemplated hereby shall have been obtained, except
as otherwise specified herein. All required consents, approvals and
authorizations of third parties to permit the consummation by the Purchasers of
the transactions contemplated by this Agreement shall have been obtained, except
as otherwise specified herein.

      (c) No action or proceeding before a court or other governmental body
shall have been instituted or threatened by any government or agency thereof, or
by any other third party, to restrain or prohibit the consummation of any of the
transactions contemplated hereby.

      (d) The Purchasers shall have received from the Sellers appropriate
documentation, reasonably satisfactory to the Purchasers, to transfer the
Purchased Assets to the Purchasers.

      Section II. Indemnification.

      (a) The parties shall be entitled to rely upon the representations and
warranties of the other parties set forth in this Agreement, and except as
otherwise specifically provided herein, such representations and warranties
shall survive the Closing and remain in full force and effect for a period of
three years after the Closing and shall thereafter expire, except with respect
to matters as to which notice has been given to the indemnifying party within
three years of the Closing. Notwithstanding the foregoing, warranties and
representations relating to title and authority matters shall survive
indefinitely.


                                                                              15
<PAGE>

      (b) The Sellers hereby agree to indemnify and hold the Purchasers and
their officers, directors, employees, stockholders, agents and representatives,
harmless from and against and to pay for any loss, liability, claim, damage or
expense (including costs of litigation and reasonable legal fees and expenses)
(a "Loss") suffered or incurred by any such indemnified party based upon,
arising out of or resulting from any of the following:

            (i) Any breach of any representation or warranty of the Sellers
contained in this Agreement or any other agreement or document delivered by them
pursuant hereto;

            (ii) Any breach of any covenant of the Sellers contained in this
Agreement or any other agreement or document delivered by it pursuant hereto
requiring performance after the Closing Date;

            (iii) Noncompliance with any so-called bulk sales law of any state
applicable to the transactions contemplated hereby; and

            (iv) Excluded Liabilities.

      (c) The Purchasers hereby agrees to indemnify the Sellers, and their
respective officers, directors, employees, stockholders, agents and
representatives, against and hold the Sellers harmless from and against and to
pay for any Loss suffered or incurred by the Sellers based upon, arising out of
or resulting from any of the following:

            (i) Any breach of any representation or warranty of the Purchasers
contained in this Agreement or any other agreement, certificate or document
delivered by the Purchasers pursuant hereto;

            (ii) Any breach of any covenant of the Purchasers contained in this
Agreement or any other agreement or document delivered by the Purchasers
pursuant hereto; and

            (iii) Assumed Liabilities.

      (d) Promptly after any person entitled to indemnification under this
Section 11 (the "Indemnified Party") has received notice of or has knowledge of
any claim against the Indemnified Party by a person not a party to this
Agreement (a "Third Person") or the commencement of any action or proceeding by
a Third Person, it shall give the other party (the "Indemnifying Party") written
notice of such claim or the commencement of such action or proceeding. Such
notice shall state the nature and the basis of such claim and a reasonable
estimate of the Loss. The Indemnifying Party shall have right to defend, at its
own expense and by its own counsel, any such matter so long as the indemnifying
Party pursues the same in good


                                                                              16
<PAGE>

faith and diligently. If the Indemnifying Party undertakes to defend or settle,
it shall promptly notify the Indemnified Party of its intention to do so, and
the Indemnified Party shall cooperate with the Indemnifying Party and its
counsel in the defense thereof and in any settlement thereof provided the
settlement consists solely of payment of money by the Indemnifying Party. Such
cooperation shall include, but shall not be limited to, furnishing the
indemnifying Party with any personnel, books, records or information reasonably
requested by the Indemnifying Party that are in the Indemnified Party's
possession or control. Notwithstanding the foregoing, the Indemnified Party
shall have the right to participate in any matter trough counsel of its own
choosing at its own expense (unless there is a conflict of interest that
prevents counsel for the Indemnifying Party from representing the Indemnified
Party, in which case the Indemnifying Party will reimburse the Indemnified Party
for the expenses of its counsel); provided however, that the Indemnifying
Party's counsel shall always be lead counsel and shall determine all litigation
and settlement steps, strategy and the like, provided, that the Indemnifying
Party shall not be entitled to pursue or effect any settlement that involves
anything other than the payment of money by the Indemnifying Party. After the
Indemnifying Party has notified the Indemnified Party of its intention to
undertake to defend or settle any such asserted liability, and for so long as
the Indemnifying Party diligently pursues such defense, the Indemnifying Party
shall not be liable for any additional legal expenses incurred by the
Indemnified Party in connection with any defense or settlement of such asserted
liability. If the Indemnifying Party desires to accept a final and complete
settlement of any such Third Person claim involving solely the payment of money
by the Indemnifying Party, such settlement shall require as an unconditional
term thereof that the Third Person deliver to the Indemnified Party a release
from all liability in respect of such claim. After Indemnified Party refuses to
consent to such settlement, then the Indemnifying Party's liability under this
Section with respect to such Third Person's claim shall be limited to the amount
so offered in settlement by said Third Person and the Indemnified Party shall
reimburse the Indemnifying Party for any additional costs of defense which it
subsequently incurs with respect to such claim. If the Indemnifying Party does
not undertake to defend such matter to which the Indemnified Party is entitled
to indemnification hereunder, or fails to diligently pursue such defense, the
Indemnified Party may undertake such defense through counsel of its choice, at
the cost and expense of the Indemnifying Party, and the Indemnified Party may
settle such matter, and the Indemnifying Party shall reimburse the Indemnified
Party for the amount paid in such settlement and any other liabilities or
expenses incurred by the Indemnified Party in connection therewith.

      (e) Anything to the contrary contained herein notwithstanding, neither
party shall be entitled to recovery from the other party with respect to any
inaccuracy or breach of any representation or warranty in Sections 5 or 6,
hereof, as applicable, unless and until the amount of such Losses suffered,
sustained or incurred by the asserting party, or to which such party becomes
subject, by reason of such inaccuracy or breach, shall exceed $40,000 calculated
on a cumulative basis and not on a per item basis (the "Basket Amount"), and
then only with respect


                                                                              17
<PAGE>

to the excess over the Basket Amount, but in no event shall either party be
liable to the other, in each case in an aggregate amount in excess of the
Purchase Price; provided, that the Basket Amount shall not be applicable to any
representations or warranties with respect to title or authority matters.

      Section 12. Termination of Agreement.

      (a) This Agreement may be terminated at any time prior to the Closing:

            (i) by mutual consent of the parties hereto;

            (ii) by the Sellers, on the one hand, or by the Purchasers, on the
other hand, in the event of a material breach or default by the other party
hereto of any provision of this Agreement and, in the case of a breach or
default that is capable of being cured, continuation of such breach or default
for a period of 30 days after written notice thereof shall have been given to
the breaching party.

      (b) Upon termination of this Agreement as provided in paragraph (a) above,
all obligations of the parties hereunder shall terminate, but such termination
will in no way limit any obligation or liability of any party based on or
arising from a breach or default by such party which occurs prior to such
termination with respect to any of his or its representations, warranties,
covenants or agreements contained in this Agreement. The provisions of this
Section 12 and of Sections 16, 17 and 18 shall survive the termination of this
Agreement.

      Section 13. Additional Covenants and Agreements.

      (a) Employee and Employee Benefit Matters.

            Employment Status. The Sellers agree that they shall terminate the
employment of the Employees (as defined below) as of the date of Closing and
that they shall not discourage the Employees from accepting employment with the
Purchasers after the date of Closing. The Employees who accept such employment
shall become Employees of the Purchasers immediately after the Closing. As used
in this Section 13(a), "Employees" shall include all of those employees of the
Business, both salaried and hourly, who are listed on Schedule 13(a) hereto. The
parties hereto understand and agree that, to the maximum extent permitted by
applicable law, such employment shall continue to be employment at will.


                                                                              18
<PAGE>

      (b) Books, Records and Information.

            (i) The Purchasers agree that all documents included in the
Purchased Assets delivered to the Purchasers by the Sellers pursuant to this
Agreement and all documents of the Business shall after the Closing be open for
inspection by representatives of the Sellers at any time during regular business
hours for reasonable and necessary purposes until such time as documents are
destroyed or possession thereof is given to the other party as provided for in
Section 13(b)(ii) hereof and that the Sellers may during such period at their
expense make such copies thereof as it may reasonably request for preparation of
Sellers' tax returns. The Sellers agrees that all documents that are retained by
the Sellers after the Closing Date and that are related to the Business (other
than tax records of the Sellers) shall be open for inspection by representatives
of the Purchasers at any time during regular business hours until such time as
documents are destroyed or possession thereof is given up to the other party as
provided for in Section 13(b)(ii) hereof and that the Purchasers may during such
period at its expense make such copies thereof as they may reasonably request.

            (ii) Without limiting the generality of Section 13(b)(i), for a
period ending on the sixth anniversary of the Closing Date, neither the
Purchasers nor the Sellers shall destroy or give up possession of any item
referred to in Section 13(b)(i) hereof without first offering to the other the
opportunity, at such other's expense (but without any other payment) to obtain
the same. Thereafter each party shall be free to dispose of any such item as it
deems fit.

            (iii) The Purchasers shall use reasonable efforts to afford the
Sellers access to employees who were previously employees of the Sellers, and
remain in the employ of the Purchasers and the Sellers shall reasonably request
for its proper business purposes, including, without limitation, the defense of
legal proceedings. Such access may include interviews or attendance at
depositions or legal proceedings. All out-of-pocket expenses reasonably incurred
by the Purchasers in connection with this Section 13(b)(iii) shall be paid or
promptly reimbursed by the Sellers.

      (c) Tax Matters.

            (i) Taxes Through Closing Date.

                  Sellers shall be solely responsible for and shall indemnify
and hold harmless Purchasers for all Taxes of CAC for all periods and also with
respect to the Business transferred to CFC and the Purchased Assets for or
pertaining to all periods up to and including the Closing Date, and which shall
be deemed included in "Excluded Liabilities." Purchasers shall be responsible
for and indemnify and hold harmless Sellers for all Taxes with respect to the


                                                                              19
<PAGE>

Purchased Assets for or pertaining to all periods thereafter except that any
Taxes imposed upon the ownership of Purchased Assets on a particular date, or
similar tax, shall be prorated over the period ending on the Closing Date and
the period thereafter. Any claim for indemnification hereunder shall be subject
to the procedures set forth in Section II hereof.

            (ii) Cooperation and Exchange of Information. Purchasers shall
provide Sellers with such cooperation and information as Sellers reasonably may
request with respect to the filing of any Return, amended Return or claim for
refund, the determination of a liability for Taxes, or a right to refund of
Taxes, or the conduct of any audit or other proceeding in respect of Taxes. Such
cooperation and information shall include providing copies of all relevant
Returns, together with accompanying schedules and related work papers, documents
relating to rulings or other determinations by taxing authorities, and records
concerning the ownership and tax basis of property, which Purchasers may possess
concerning the Business. Purchasers shall make its employees available to
Sellers on a mutually convenient basis to provide explanation of any documents
or information provided hereunder. Notwithstanding the foregoing, Purchasers
shall not be required to prepare any documents, or determine any information not
ten in its possession in response to a request under this Section 13(c)(ii)
Sellers shall reimburse Purchasers for any reasonable out-of-pocket costs
incurred by Purchasers in providing any Return, document or other written
information, and shall reimburse Purchasers for any reasonable out-of-pocket
costs (excluding regular wages and salaries) of making employees available, upon
receipt of reasonable documentation of such costs. Except as otherwise provided
in this Agreement, Purchasers shall retain all Returns, schedules and work
papers and all material records or other documents relating thereto, until the
expiration of the period of time beginning on the Closing Date and ending on the
date on which taxes may no longer be assessed under the applicable statutes of
limitation, including the period of waivers or extensions thereof Any
information obtained under this Section 13(c)(ii) shall be kept confidential,
except as may be otherwise necessary in connection with the filing of returns or
claims for refund or in conducting any audit or other proceeding.

            (iii) Purchasers and the Sellers recognize their mutual obligations
pursuant to Section 1060 of the Code to timely file IRS Form 8594 (the "Asset
Acquisition Statement") with each of their respective federal income tax
returns.

            (iv) The Sellers shall pay any transfer tax in connection with the
transfer of the real estate component of the Purchased Assets, and the
Purchasers shall pay any mortgage recording tax in connection wit the mortgage
of the real estate component of the Purchased Assets.


                                                                              20
<PAGE>

      Section 14. Remedies.

      The Sellers agree that the Purchased Assets are unique and that the
Purchasers will be irreparably harmed in the event that this Agreement,
including the obligations of the Sellers to sell and deliver the Purchased
Assets to the Purchasers are not specifically enforced. The parties further
agree it is impossible to measure in money the damage which will accrue by
reason of a refusal by the Sellers to perform such obligations under this
Agreement. Therefore, in the event that the Purchasers shall institute any
action to enforce such obligations, the Sellers hereby acknowledges that the
Purchasers do not have an adequate remedy at law and that injunctive or other
equitable relief will not constitute any hardship upon the Sellers.

      Section 15. Definitions.

      As used in this Agreement, the following terms shall have the meanings
ascribed to them below:

      (a) "Affiliate" means, when used with reference to a specified party, (i)
any entity that, directly, or indirectly through one or more intermediaries,
controls, is controlled by, or is under common control with, the specified
party, and (ii) any entity of which the specified party is, directly or
indirectly, the owner of an equity interest often (10) percent or more.

      (b) "Code" means the Internal Revenue Code of 1986, as amended.

      (c) "Lien" means any mortgage, lien, pledge, restriction, charge, security
interest, claims, encumbrance, or right, title and interest of others.

      (d) "Person" means any individual, general partnership, limited
partnership, corporation, joint venture, trust, business trust, cooperative,
association or other form of organization.

      (e) "To the best of the Sellers' Knowledge" means all information which is
currently and actually known by an executive officer or other managerial
employee of the Sellers.

      Section 16. Confidentiality.

      Neither of the parties hereto shall disclose the terms of any non-public
confidential information of the other parties hereto or any Affiliate thereof
obtained in connection with the proposed transactions hereunder without the
prior written consent of the other party, which consent shall not be
unreasonably withheld or delayed. The parties and their representatives


                                                                              21
<PAGE>

shall, for a period of three (3) years from the date hereof, treat all
information of the other parties as confidential (except to the extent that such
information: (i) is now, or later comes to be, in the public domain, other than
through the acts of the receiving party or its representatives in breach of this
provision, (ii) can be shown to have been known by the receiving party prior to
the time of disclosure to it by the other party, (iii) is later disclosed to the
receiving party on a nonconfidential basis by a Person having no obligation to
the disclosing party in regard thereto, (iv) is independently developed, as
evidenced by written records, by the receiving party, or (v) is required to be
disclosed by law.

      Section 17. Expenses.

      Whether or not the transactions contemplated by this Agreement are
consummated, each party will pay its respective expenses, including all fees and
expenses of counsel, accountants and other advisors, incurred in connection with
the origination, negotiation, execution and performance of this Agreement.

      Section 18. Further Assurances.

      From time to time after the execution hereof, at the request of the
Purchasers and without further consideration, the Sellers shall execute and
deliver such other and further instruments of conveyance, assignment, transfer
and consent, and take such other action as the Purchasers may reasonably request
in connection with the transfer of the Purchased Assets and the business of the
Sellers and for the more effective consummation of the transactions contemplated
hereby.

      Section 19. No Public Announcement.

      Neither party shall make, or permit any of its directors, officers,
employees, agents, advisors, Affiliates or representatives to make, any press
release, public announcement or other public disclosure with respect to the
existence of this Agreement or the transactions contemplated hereby or thereby
without the prior consent of the other party, except as and to the extent that
counsel for such party shall determine that such announcement or disclosure is
required by law, rule, regulation or order of any governmental, regulatory or
judicial body and provided that the text of any such proposed announcement or
disclosure has been timely submitted to the other party for comment and such
comments, if timely made, have been considered in good faith.

      Section 20. Entire Agreement.

      This Agreement (including all attachments hereto) comprise the entire
agreement among the parties hereto as to the subject matter hereof and thereof,
and supersede all prior agreements


                                                                              22
<PAGE>

and understandings between them relating thereto. All of the provisions of the
Agreement shall survive the Closing except as otherwise provided herein.

      Section 21. Amendments and Waivers.

      This Agreement may not be amended or modified, except by a writing
executed by the parties hereto. No extension of time for, or waiver of the
performance of, any obligation of any party hereto shall be effective unless it
is made in a writing signed by the party granting such extension or waiver.
Unless it specifically states otherwise, no waiver shall constitute or be
construed as a waiver of any subsequent breach or non-performance.

      Section 22. Notices.

      Any notice, request, demand, waiver, consent, approval or other
communication which is required or permitted to be given pursuant to this
Agreement shall be in writing and shall be given in person or by telecopy or by
certified or registered first-class mail or internationally recognized express
courier delivery service addressed as follows:

If to the Sellers:             Columbus Farming Corporation
                               c/o United States Surgical Corporation
                               150 Glover Avenue
                               Norwalk CT 06S56
                               Attention: Legal Department

If to the Purchasers:          Alexion Pharmaceuticals, Inc.
                               25 Science Park, Suite 360
                               New Haven, CT 06511
                               Attention: Executive V.P. & C.E.O.

Any such address may be changed by any party by written notice to the other
parties given in accordance herewith. Any notice shall be deemed to be given
three (3) days after being placed for delivery so addressed with postage or
other charges prepaid, provided, however, that any written notice actually
received by any party in less than three (3) days shall be deemed to be given,
for all purposes of this Agreement, at the time it is received.

      Section 23. Governing Law.

      This Agreement is made and shall be construed in accordance with the laws
of the State of New York without giving effect to the conflict of laws
principles thereof


                                                                              23
<PAGE>

      Section 24. Successors and Assigns.

      This Agreement shall inure to the benefit of, and be binding upon and
enforceable against, the respective successors and assigns of the parties
hereto.


                                                                              24
<PAGE>

      Section 25. Captions.

      Section headings and other captions are supplied herein for convenience
only and shall not be deemed a part of this Agreement for any purpose.

      Section 26. Counterparts.

      This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original for all purposes, and all of which together
shall constitute one agreement.

      Section 27. Severability.

      If any term or provision of this Agreement, or the application thereof to
any person or circumstance, shall to any extent be overly broad, invalid or
unenforceable, the remainder of this Agreement, or the application of such term
or provision to persons or circumstances other than those as to which it is
overly broad, invalid or unenforceable, shall not be affected thereby and each
term and provision of this Agreement shall be valid and enforced to the fullest
extent permitted by law.

      IN WITNESS WHEREOF, the parties hereto have duly executed and delivered
this Agreement as of the day and year first above written.


                            UNITED STATES SURGICAL CORPORATION

                            By: /s/ Steven J. Amelio
                                ---------------------------------------

                            Name:  Steven J. Amelio
                                  -------------------------------------

                            Title: VP & Controller USSC
                                   ------------------------------------


                            CFC ASSETS CORPORATION

                            By: /s/ Steven J. Amelio
                                ---------------------------------------

                            Name:  Steven J. Amelio
                                  -------------------------------------

                            Title: VP
                                   ------------------------------------


                            COLUMBUS FARMING CORPORATION

                            By: /s/ Barry P. Luke
                                ---------------------------------------

                            Name:  Barry P. Luke
                                  -------------------------------------

                            Title: VP
                                   ------------------------------------


                            ALEXION PHARMACEUTICALS, INC.

                            By: /s/ Barry P. Luke
                                ---------------------------------------

                            Name:  Barry P. Luke
                                  -------------------------------------

                            Title: VP of Finance and Administration
                                   ------------------------------------


                                                                              25


<PAGE>

                                                                   Exhibit 10.28

                                    Amendment

                                       to

                             Collaboration Agreement

                                     between

                     Procter & Gamble Pharmaceuticals, Inc.

                                       and

                          Alexion Pharmaceuticals, Inc.

      This Amendment is made on April 6, 1999, by and between and Procter &
Gamble Company (herein together with its Affiliate Procter & Gamble
Pharmaceuticals Inc., "Procter & Gamble"), an Ohio corporation with principle
offices at One Procter & Gamble Plaza, Cincinnati, Ohio 45202, and Alexion
Pharmaceuticals, Inc., a Delaware corporation with a principle office at 25
Science Park, New Haven, Connecticut (hereinafter, together with its Affiliates,
"Alexion") generally referred to herein individually as a "Party" or
collectively as the "Parties".

                                   Background

The Parties entered into the Collaboration Agreement (the "Agreement") as of
January 25, 1999. The Parties wish to amend the Agreement as set forth herein.

      Section 4.1 of the Agreement is hereby amended by deleting the first
sentence and replacing it with the following:

      The parties will agree to finalize a Research & Development Plan within
ninety (90) days after the Effective Date.

      All other terms and condition of the Agreement shall remain in force
without modification.
<PAGE>

      IN WITNESS WHEREOF, the Parties hereto have executed this Amendment as of
the date first set forth above.

Procter & Gamble Company
(Procter & Gamble)

By /s/ [ILLEGIBLE]                      Form MPM
  ---------------------------------         ------------------------------------
Title Vice President                    Execution AFM
     ------------------------------              -------------------------------


Alexion Pharmaceuticals, Inc.
(Alexion)

By /s/ David Keiser
  ---------------------------------
Title Exec. VP & COO
     ------------------------------

<PAGE>

                                                                  Execution Copy

                             COLLABORATION AGREEMENT

                                     between

                          THE PROCTER & GAMBLE COMPANY

                                       and

                          ALEXION PHARMACEUTICALS, INC.

                                January 25, 1999
<PAGE>

                                Table of Contents

I.      Definitions .......................................................   2
II.     License Grants ....................................................   9
III.    Overview and Management of Collaboration ..........................  12
IV.     Research and Development ..........................................  15
V.      Manufacturing of Product ..........................................  19
VI.     Health Registration Obligation ....................................  21
VII.    Marketing of Products .............................................  21
VIII.   Milestones, Royalties, Payments and Accounting ....................  23
IX.     Patents, Trademarks and Infringement ..............................  31
X.      Confidentiality ...................................................  36
XI.     Representations and Warranties ....................................  38
XII.    Indemnification; Insurance ........................................  42
XIII.   Term, Termination, Change of Control ..............................  45
IV.     Miscellaneous .....................................................  59
XV.     Execution .........................................................  65
<PAGE>

                             COLLABORATION AGREEMENT

Made as of this 25th day of January, 1999, by and among:

      The Procter & Gamble Company, an Ohio corporation having its principal
offices at One Procter & Gamble Plaza, Cincinnati, Ohio 45202 (hereinafter,
together with its Affiliate Procter & Gamble Pharmaceuticals, Inc., "Procter &
Gamble"), and

      Alexion Pharmaceuticals, Inc., a Delaware corporation having its principal
office at 25 Science Park, New Haven, Connecticut (hereinafter, together with
its Affiliates, "Alexion").

The following sets forth the background for this Agreement:

      Alexion conducts pharmaceutical research and development, based on
      significant expertise in identifying and developing therapeutic agents
      targeted at treating a variety of disorders, including without limitation
      products having utility in the treatment of acute cardiovascular
      disorders.

      Procter & Gamble conducts research and develops and markets pharmaceutical
      products for the treatment of a variety of disorders, including without
      limitation products having utility in the treatment of cardiovascular
      disorders.

      Procter & Gamble and Alexion share a mutual interest in a collaboration
      aimed at the further development of C5 complement inhibitor agents
      identified by Alexion with Procter & Gamble to market resulting products.

      Procter & Gamble and Alexion intend fully to utilize their capabilities,
      capitalize on each other's expertise, and put forth commercially
      reasonable efforts to achieve the objectives of this collaboration, and
      recognize that Alexion is contributing valuable technologies, and each
      party is contributing valuable expertise and capabilities to this effort
      and that the combination of these compatible and complementary
      technologies, expertise and capabilities creates the basis for a
      successful collaboration.
<PAGE>

Accordingly, in consideration of the mutual promises, covenants and agreements
hereinafter set forth, the Parties agree to the following terms and conditions:

                             Article I - Definitions

      1.1. "Affiliate" means any entity that directly or indirectly Owns, is
Owned by, or is under common Ownership with a Party to this Agreement. "Owns" or
"Ownership" means direct or indirect possession of more than fifty percent (50%)
of the votes of holders of a corporation's voting securities or a comparable
equity interest in any other type of entity.

      1.2. "Alexion Indications" are described in Section 4.6.

      1.3. "Agreement" means the present agreement together with all
attachments.

      1.4. "Alexion Know-how" means Know-how owned or Controlled in the Field by
Alexion, but excluding Alexion Patents and Joint Patents.

      1.5. "Alexion Patents" means all Patents owned or Controlled by Alexion
with the right to sublicense to the extent claiming, in the Field, a
Collaboration Inhibitor, research methods and materials used in performing
research and manufacturing processes or for discovering, identifying or testing
a Collaboration Inhibitor, or the manufacture, use, import, or sale of a
Collaboration Inhibitor or Product where such Patents cover (a) inventions made
prior to the date of this Agreement or (b) inventions made in the course of the
Research & Development Plan by employees of Alexion. Alexion Patents include,
without limitation, the patents and patent applications listed in Schedule 1.5
delivered to Procter & Gamble contemporaneously herewith (as may be amended as
appropriate). Continuations-in-part covered by Licensed Technology are limited
to continuations-in-part dominated by claims in any of the patents or
applications licensed to Alexion thereunder.


                                       2
<PAGE>

      1.6. "Alexion Product Cost" means Direct Costs incurred by Alexion for
the production, testing and finishing of clinical bulk material and/or vials
of Product.

      1.7. "Article" means any article of this Agreement.

      1.8. "Collaboration Inhibitor" means the humanized anti-C5 monoclonal
antibody coded h5G1.1-ScFv and analogs, derivatives and formulations thereof
owned or otherwise Controlled by Alexion.

      1.9. "Collaboration Term" means the period commencing on the Effective
Date and ending on the expiration of the Research & Development Plan, unless
terminated earlier pursuant to Sections 13.2, 13.3 or 13.4, or extended by
mutual agreement of the Parties.

      1.10. "Commercially Reasonable Efforts" means efforts and resources
commonly used in the research-based pharmaceutical industry for a compound or
product at a similar stage of research, development or commercialization, and
having similar market potential. Commercially Reasonable Efforts shall be
determined taking into account the stage of research, development or
commercialization of the compound or product, the cost-effectiveness of efforts
or resources while optimizing profitability, the competitiveness of alternative
products that are or are expected to be in the relevant marketplace, the
proprietary position of the product, the regulatory and business environment,
the likelihood of regulatory approval and product reimbursement, the
profitability of the product, the existence of alternative products that may
also be developed by the Parties, and all other relevant factors. Commercially
Reasonable Efforts shall be determined on an indication-by-indication and
market-by-market basis, and it is anticipated that the level of effort will
change over time reflecting changes in the status of the compound, product and
the market involved.

      1.11. "Competing Product" means any pharmaceutical compound or product
that specifically inhibits the production of C5a or specifically inhibits
interaction with its receptor and in either case which is developed for use
in acute cardiovascular conditions and/or applications and which is not a
Product.


                                       3
<PAGE>

and which is not a Product.

      1.12. "Contract year" means the twelve (12) month period following the
Effective Date.

      1.13. "Control" means, with respect to an item of information or
intellectual property right, the possession of the ability to grant a license or
sublicense as provided for herein under such item or right without violating the
terms of any agreement or other arrangement, express or implied, with any Third
Party.

      1.14. "Direct Costs" means costs, of a nature, amount, and method of
calculation approved in advance by the Research & Development Steering Committee
via the Research & Development Plan, that are incurred by Alexion, based upon
efforts, funds and/or resources expended to perform its obligations under such
plan. Direct Costs may include the fully burdened costs associated with
activities performed by Alexion, or by a Third Party, for the research,
development, testing or manufacturing of Products. Direct Costs shall not
include any mark-up or profit above actual costs.

      1.15. "Effective Date" means the date described in Section 13.1(a).

      1.16. "Effort Year" means nineteen hundred and twenty (1,920) hours of
direct effort expended on or in furtherance of the Research & Development Plan
during a year.

      1.17. "Field" means the research, development, commercialization and
use of Collaboration Inhibitor.

      1.18. "Fiscal Quarter" means each period of three (3) months ending on 31
March or 30 June or 30 September or 31 December. The first Fiscal Quarter starts
as of the Effective Date and ends on 31 March.

      1.19. "Fiscal Year" means the twelve (12) month period of time from July
to June 30,


                                       4
<PAGE>

except that the first Fiscal Year commences on the Effective Date and ends on
June 30, 1999, and the last Fiscal Year during the Term shall end on the
anniversary of the Effective Date in the Fiscal Year in which the Term expires
or is terminated pursuant to Article XIII.

      1.20. "Full Time Equivalent" ("FTE") means one Effort Year of an employee
or class of employees.

      1.21. "GAAP" means U.S. generally accepted accounting principles.

      1.22. "Health Registration" means any and all consents, licenses,
authorizations, reimbursement pricing or approvals required by a regulatory
authority such as the USFDA or any other Ministry of Health, for the
distribution, sale, manufacture, or testing of the Product, including, without
limitation, an IND, NDA or supplemental NDA or other application or supplemental
application for a Health Registration.

      1.23. "Joint Patents" means all Patents, to the extent claiming, in the
Field, a Collaboration Inhibitor, the manufacture or use of a Collaboration
Inhibitor, research methods and materials used in performing research and
manufacturing process or for discovering, identifying, or testing for a
Collaboration Inhibitor, where such Patents cover inventions made jointly by
employees or agents of Alexion and Procter & Gamble prior to the end of the
Collaboration Term. In determining inventorship and rights in joint inventions,
the laws of the United States shall apply to any particular patent.

      1.24. "Know-how" means techniques and data specifically in the Field,
including, without limitation, inventions, practices, methods, knowledge,
know-how, skill, test data including pharmacological, toxicological and clinical
test data, analytical and quality control data, but excluding Alexion Patents,
Joint Patents, and Procter & Gamble Patents.

      1.25. "Licensed Technology" means the technology licensed to Alexion under
the license agreements identified on Schedule 1.25 delivered contemporaneously
herewith.


                                       5
<PAGE>

      1.26. "Marketed Product" means a Product which is approved by a regulatory
agency for sale pursuant to this Agreement in any country in the Territory.

      1.27. "Net Sales" shall mean, for any period, the gross sales (as defined
below) by Procter & Gamble, its Affiliates and sublicensees to Third Parties,
attributable to Products, determined by the gross amount invoiced to the
purchaser, including, if applicable, the value of all properties and services
received in consideration of sales of Products, less: (i) normal and customary
quantity and/or cash discounts, allowances, rebates, customer merchandising and
pricing funds (which includes price declines, Procter & Gamble's Business
Development Funds, and managed care discounts), fees paid to distributors
measured by the billing amount and chargebacks actually allowed or given from
the billed amount; (ii) freight, postage, shipping, and insurance expenses (if
separately identified in such invoice); (iii) credits or refunds actually
allowed for rejected, outdated or returned Product; and (iv) sales and other
taxes and duties directly related to the sale, to the extent that such items are
included in the gross invoice price (but not including taxes assessed against
the income derived from such sale) provided that any discounts, allowances and
rebates, based on overall purchases by the customer of the selling Party may be
applied to reduce Net Sales only to the extent of the pro rata amount of such
discounts or rebates attributable to the Products included in such overall
purchases. Any of the deductions listed above which involves a payment by
Procter & Gamble shall be taken as a deduction against aggregate sales for the
Fiscal Quarter in which the expense is accrued by Procter & Gamble. For purposes
of determining Net Sales, Product shall be deemed to be sold when shipped or to
be the subject of a sale upon the delivery of Products to the purchaser or a
common carrier at the risk of the purchaser and the transfer of title thereto to
the purchaser.

      Sales between or among Procter & Gamble and its Affiliates shall be
excluded from the computation of Net Sales, but sales by such Parties to their
customers shall be included in such computation.

      Where a sale is deemed consummated by the gift or other disposition of
Products for


                                       6
<PAGE>

other than a selling price stated in cash, the term "Net Sales" shall mean the
average gross selling price billed by Procter & Gamble, an Affiliate or its
sublicensee, as the case may be, in consideration of comparable Products during
the three (3) month period immediately preceding such disposition, without
reduction of any kind. For such purposes, a gift shall not include product
samples distributed in customary manner for similar products in the
pharmaceutical industry and Products supplied for clinical studies.

      In the event a Product incorporate or is sold in combination with one or
more other active ingredients ("Other Product"), Net Sales shall be calculated
by multiplying the Net Sales of the combination Product by a fraction
"A/A(A+B)," where "A" is the average gross selling price of the Product during
the preceding calendar quarter sold separately by Procter & Gamble and "B" is
the average gross selling price during such quarter of the Other Product sold
separately by Procter & Gamble or, in the event the Product and Other Product
are not sold separately, a fraction "C/(C+D)," where "C" is the cost of
manufacture or acquisition to Procter & Gamble of the Products alone and "D" is
the cost of manufacture or acquisition to Procter & Gamble of the Other Product;
provided, however, such fraction shall in no event be less than one-half (1/2).

      1.28. "Party" means Alexion or Procter & Gamble.

      1.29. "Patent" means all Valid Claims in all patent applications, and all
continuing and divisional patent applications, continuations-in-part and reissue
applications claiming priority, indirectly and directly, to such applications,
and all patents issuing therefrom in the Territory as well as extensions
thereof, including Supplementary Certificates of Protection of a member state of
the European Community.

      1.30. "Primary Indication" means an indication for the Product for
treatment of patients undergoing cardiopulmonary bypass procedures as defined
in an approved Research & Development Plan.

      1.31. "Procter & Gamble Know-how" means Know-how owned or Controlled in
the


                                       7
<PAGE>

Field by Procter & Gamble, but excluding Procter & Gamble Patents and Joint
Patents.

      1.32. "Procter & Gamble Patents" means all Patents owned or Controlled by
Procter & Gamble to the extent claiming, in the Field, a Collaboration
Inhibitor, research methods and materials used in performing research and
manufacturing processes or for discovering, identifying or testing a
Collaboration Inhibitor, or the manufacture, sale or import of a Collaboration
Inhibitor or Product, where such Patents cover inventions made solely by
employees or agents of Procter & Gamble after the Effective Date and prior to
the end of the Term.

      1.33. "Product" means any pharmaceutical composition containing any form
or dosage, including the Product in a vial, of a pharmaceutical or other product
or any process, which contains or is based upon a Collaboration Inhibitor or
which results from the manufacture, production or use of a claim of an Alexion
Patent or Joint Patent, wherever sold, which if not licensed, would infringe
upon Alexion Patents or Joint Patents (if issued).

      1.34. "Research & Development Steering Committee" means the committee
described in Section 3.2.

      1.35. "Secondary Indication" means an indication for the Product for
treatment of acute myocardial infarctions as defined in an approved Research
& Development Plan.

      1.36. "Section" means any section of this Agreement.

      1.37. "Success Criteria" means the specific criteria that define the
minimum technical and commercial requirements for a Product set forth in a
Research & Development Plan approved by the Research & Development Steering
committee or defined by Procter & Gamble for marketing.

      1.38. "Term" means the period of time specified in Section 13.1(b).


                                       8
<PAGE>

      1.39. "Territory" means the entire world.

      1.40. "Tertiary Indication" means an indication for the Product for any
acute cardiovascular application other than the Primary or Secondary
Indications which has been defined in an approved Research & Development Plan
as a Tertiary Indication.

      1.41. "Third Party" means any entity other than Alexion or Procter &
Gamble.

      1.42. "Valid Claim" means any claim in a published or unexpired
application or patent included within a Patent which claim has not been held
unenforceable, unpatentable or invalid by a decision of a court or other
governmental agency of competent jurisdiction, unappealable or unappealed within
the time allowed for appeal, and which has not been finally abandoned or
admitted to be invalid or unenforceable through disclaimer by the patenting
Party.

                           Article II - License Grants

      2.1. License Grants.

            (a) Patent License For Commercialization of Products. Alexion
hereby grants Procter & Gamble a worldwide, exclusive royalty-bearing license
or sublicense, in the Field, under Alexion Patents and Alexion's interest in
Joint Patents, with the right to grant sublicenses, to make, have made, use,
import, and offer for sale and sell Products.

            (b) Know-how License to Procter & Gamble. Alexion hereby grants to
Procter & Gamble:

            (i)   an exclusive worldwide license to use Alexion Know-how within
                  the Field, wherein such Know-how is solely related to the
                  Collaboration Inhibitor including but not limited to the
                  non-clinical development, process development,
                  manufacturing, clinical development, and marketing of a
                  Collaboration Inhibitor, in pursuance of the Research &
                  Development Plan, during the Collaboration Term, and during
                  the


                                       9
<PAGE>

                  remaining Term of this Agreement.

            (ii)  a non-exclusive worldwide license to use Alexion Know-how
                  within the Field, wherein such Know-how related to a
                  Collaboration Inhibitor including but not limited to the
                  non-clinical development, and marketing of a Collaboration
                  Inhibitor, in pursuance of the Research & Development Plan,
                  during the Collaboration Term, and during the Collaboration
                  Term, and during the remaining Term of this Agreement.

            (c) Research License to Procter & Gamble. With respect to any
Alexion Patents and Alexion's interest in Joint Patents, Procter & Gamble
shall have the worldwide right, within the Field and in pursuance of the
Research & Development Plan, for Products, exclusively, with the right to
grant research sublicenses only as authorized by the Research & Development
Steering Committee to:

                  (i) to make, have made, use and have used, import and have
            imported, but not to sell or have sold, any such discovery or
            invention;

                  (ii) to practice and have practiced on its behalf any such
            discovered or invented methods of making devices or materials,
            provided any devices or materials made by said methods are not
            offered for sale to non-Affiliate third parties; and

                  (iii) to use and have used on its behalf any such discovered
            or invented methods of using devices or materials, provided said
            devices or materials are not offered for sale to non-Affiliate Third
            Parties.

      2.2. Non-exclusive Licenses to Alexion. Procter & Gamble hereby grants
Alexion a non-exclusive worldwide license, with the right to grant
sublicenses as authorized by the Research & Development Steering Committee,
to use Procter & Gamble Patents and Procter & Gamble Know-how, within the
Field in pursuance of the Research & Development Plan, to perform research
and development and manufacturing activities in accordance with the Research
& Development Plan, or for Products.

      2.3. Sublicenses.


                                       10
<PAGE>

            (a) Procter & Gamble shall provide to Alexion prior written
notice of Procter & Gamble's intent to sublicense, specifying the intended
sublicensee. Alexion may discuss the appropriateness of such intended
sublicensee with Procter & Gamble prior to the execution of the sublicense
agreement; however, the ultimate decision is Procter & Gamble's. All
sublicenses granted by Procter & Gamble shall provide that the obligations to
Alexion of Procter & Gamble under Articles VIII, X and XII and Sections
11.2(b), 11.3(a)(iv) and 11.4 of this Agreement shall be binding upon
sublicensees as if it were a party to this Agreement, and comparable
paragraphs no more favorable to the sublicensee shall be included within all
sublicense agreements; provided that such provisions shall obligate the
sublicensee only with respect to its sales and actions. Procter &
Gamble shall provide to Alexion (i) a copy of all sublicense agreements promptly
after execution, and (ii) annually, together with the report required in Section
8.5 of this Agreement, copies of reports related to financial and research and
development performance received by Procter & Gamble from its sublicensees
during the preceding three (3) month period or twelve (12) month period, as the
case may be.

            (b) If a Third Party licensor of Licensed Technology, wherein the
manufacture, use, importation or sale of a Marketed Product would, but for the
licenses granted by the Third Party, infringe the Third Party Valid Claim, shall
seek to terminate such license due to the default by Alexion, Alexion shall give
Procter & Gamble written notice specifying the nature of the breach. If Alexion
cannot or does not cure the Third Party breach and provided Procter & Gamble
shall have paid all amounts payable hereunder due (without reference to any
notice, cure, audit or other effective extension of the period of performance)
and fully complied with all of its obligations hereunder, including without
limitation, to commercialize the Product, then Procter & Gamble shall have the
right upon written notice to Alexion to cure the Third Party breach and credit
all amounts paid by it to the Third Party licensor against royalties payable by
it to Alexion pursuant to Section 8.2(a).

      2.4. Certain Rights; No Implied License. In addition to all other rights
of Alexion under this Agreement, Alexion retains on behalf of itself the
perpetual, royalty-free, non-transferable right and license to practice all
technology exclusively licensed by it hereunder for research and educational
purposes, on a non-commercial basis, as approved by the Research


                                       11
<PAGE>

& Development Steering Committee. Except as otherwise provided in this
Agreement, under no circumstances shall a Party hereto as a result of this
Agreement obtain any ownership interest or other right in any technology,
know-how, trade secrets, patents, pending patent applications, products,
vaccines, antibodies, cell lines or cultures, or animals of the other Party,
including items owned, controlled, developed by the other, or transferred by the
other to such Party at any time pursuant to this Agreement. The licenses and
rights granted in this Agreement shall not be construed to confer any rights
upon a Party by implication, estoppel or otherwise as to any technology not
specifically identified in this Agreement as or included within such license
rights, and no other assignments or licenses are made or granted by implication,
estoppel or otherwise, by this Agreement. All rights granted by Alexion to
Procter & Gamble under this Agreement which are now or in the future licensed to
Alexion are and shall be subject to the rights of the licensors and the terms of
the licenses thereof

      2.5. Government. Procter & Gamble acknowledges that the Licensed
Technology hereunder or a portion thereof was developed with financial or other
assistance from the United States of America, and that applicable statutes,
regulations and Executive Orders of the United States of America may control,
apply to or affect the license granted hereunder and any sublicenses granted
hereunder. Procter & Gamble acknowledges that it is responsible for making its
own determination about the applicability of any statutes, regulations or
Executive Orders and the licensors' compliance therewith.

             Article III - Overview and Management of Collaboration

      3.1. Scope of Collaboration. The Parties will work together to research,
develop and commercialize Products pursuant to this Agreement. All such research
and development work shall be conducted according to a Research & Development
Plan during the Collaboration Term established and approved by the Research &
Development Steering Committee pursuant to Article III. The Research &
Development Plan will be conducted with the goals of (a) worldwide development
of product in Primary, Secondary and Tertiary Indications and exploration of
additional indications; and (b) development of efficient and economic processes


                                       12
<PAGE>

for manufacture of Product. Procter & Gamble will commercialize Products
pursuant to Article V. Alexion and Procter & Gamble agree that they will conduct
the Research & Development Plan on a collaboration basis with the goal of
commercializing Products.

      3.2. Research & Development Steering Committee Membership. The research
and development work under this Agreement, as set forth in Section 3.1, shall be
performed by the Parties pursuant to the oversight of the Research & Development
Steering Committee. Notwithstanding the overall responsibility of the Research &
Development Steering Committee for the management and direction of the
collaboration hereunder, it is the expectation of the Parties that the following
initial primary responsibilities shall be allocated between the parties, as
follows:

<TABLE>
<CAPTION>
                                           Initial Responsible Party for Primary
                                           Secondary & Tertiary Indications
                                           -------------------------------------
<S>                                        <C>                   <C>
       Function/Activity                   U.S.                  Global
       -----------------                   ----                  ------

       non-clinical R&D                    Alexion               Alexion

       process development &
       clinical manufacture                Alexion               Alexion

       clinical packaging                  P&G                   P&G

       clinical design                     Alexion/P&G*          P&G

       clinical implementation             P&G/Alexion*          P&G

       clinical monitoring                 P&G/Alexion*          P&G
</TABLE>

*     Indicating shared responsibility with the first named Party being the lead
      Party.

      The Research & Development Steering Committee has overall responsibility
for the definition, conduct and execution of the Research & Development Plan,
which will include without limitation defining Success Criteria, setting the
budget for Alexion activities, and determining allocation of work to be done by
Alexion, Procter & Gamble or Third Parties. The Research & Development Steering
Committee may delegate its responsibilities and activities to other committees
(e.g., to a Patent Committee, Research Committee, Finance Committee,


                                       13
<PAGE>

Clinical Committee or such other committees as the Research & Development
Steering Committee may establish); however, the Research & Development Steering
Committee has final approval. The Research & Development Steering Committee will
be co-chaired by two (2) members with one (1) member designated by each Party.
The co-chairmen are senior R&D executives. The Parties will be free to change
their respective representatives, on notice to the other Party. Total
representation shall not exceed ten (10) members (five (5) members per Party)
unless otherwise agreed to by the Parties. The first Research & Development
Steering Committee meeting shall occur within thirty (30) days of the Effective
Date.

      3.3. Meetings. The Research & Development Steering Committee will meet at
least quarterly, or as the Parties shall otherwise agree. Either Party may call
a special meeting of the Research & Development Steering Committee up to two (2)
times per year, on fifteen (15) days' written notice to the other Party. The
Party convening a special meeting shall send notices and agenda for such
meeting. Meetings will alternate between the offices of the Parties, or may be
held via teleconference, videoconference or such other place or manner as the
Parties may mutually agree. The Party hosting any meeting shall appoint a
secretary to the meeting who will record the minutes of the meeting which will
be circulated to the members of the Research & Development Steering Committee
promptly following the meeting for review, comment, and adoption.

      3.4. Decision-making Criteria. All decisions of the Research &
Development Steering Committee shall be made by the co-chairmen and in the
exercise of good faith. Such decisions shall adhere to the ethical and legal
standards for the research-based pharmaceutical industry and shall be
consistent with the use of Commercially Reasonable Efforts to research and
develop Products. Subject to the foregoing, Procter & Gamble shall have the
final decision in the Research & Development Steering Committee.

      3.5. Dispute Resolution. If Alexion does not agree with a decision by the
Research & Development Steering Committee, the matter shall be referred for
further review and resolution by the Chairman or CEO of Alexion and the
President of Procter & Gamble Pharmaceuticals (the


                                       14

<PAGE>

"CEOs"), if both CEOs were not voting members of the Research & Development
Steering Committee. Action will be delayed until such meeting or discussion
between the CEOs. If the CEOs (or the Research & Development Steering Committee,
if the CEOs are both voting members) cannot resolve the issue within ten (10)
business days of such reference, the decision by Procter & Gamble's CEO shall be
binding.

      3.6. Record-keeping. The Research & Development Steering Committee and all
other committees formed thereunder shall appoint one Party to keep complete and
accurate records pertaining to the committees' meetings and activities. The
other Party shall have the right to review such records upon reasonable notice
to the record-keeping party and at reasonable times.

      3.7. Non-compete. Neither Alexion nor Procter & Gamble shall itself or in
conjunction with a Third Party enter into the development or commercialization
of a Competing Product during the Term of this Agreement.

                      Article IV - Research and Development

      4.1. Research & Development Plan. The initial Research & Development Plan
is set forth in Schedule 4.1 delivered contemporaneously herewith. Prior to the
finalization of a Research & Development Plan, the Research & Development
Steering Committee, or designated subcommittee, will adopt a process for
managing project costs including but not limited to budget timing, forecast
updates, invoicing procedures, etc. The Parties will agree to finalize a
Research & Development Plan within sixty (60) days after the Effective Date. The
Research & Development Steering Committee is authorized to approve and amend the
Research & Development Plan (other than matters affecting Milestone payments or
minimum number of FTEs set forth in Section 4.2(a)). The Research & Development
Steering Committee may periodically modify the Research & Development Plan,
within the scope of and in a manner consistent with this Agreement, and the more
detailed responsibilities of each Party within the general scope of
responsibilities set forth herein, and revise the Research & Development Plan
accordingly. Procter & Gamble hereby designates Alexion as its favored
development and


                                       15
<PAGE>

commercialization partner and collaborator with respect to Collaboration
Inhibitor except as otherwise specifically provided herein. The Research &
Development Plan shall include a line item description and budget for all
approved Alexion R&D activities and expenditures, including Alexion FTE
allocations and any Third Party costs incurred by Alexion which will be
reimbursed by Procter & Gamble.

      4.2. Funding of Research & Development Plan.

            (a) FTE-Based Funding and Other Funding. Procter & Gamble will fund
Alexion FTEs for work pursuant to the Research & Development Plan and approved
by the Research & Development Steering Committee. However, during the first
three (3) Contract Years of the Agreement, notwithstanding any re-allocation of
research effort or responsibility or any other changes to the Research &
Development Plan, but subject to Sections 13.2 and 13.7(a) below, Procter &
Gamble agrees to fund at least the following minimum number of Alexion FTEs
listed below per Contract Year for work pursuant to the Research & Development
Plan. Work includes without limitation, non-clinical research and development,
process development and clinical assays.

                        Contract Year       Alexion FTEs
                        -------------       ------------

                              1                  12

                              2                  20

                              3                  20

      In addition to such FTE-based funding, Procter & Gamble shall pay or
reimburse Alexion for outside costs to Third Parties approved by the Research &
Development Steering Committee and incurred in connection with the Research &
Development Plan but such outside costs shall exclude the routine costs of
compensation, facilities, supplies and overhead of Alexion FTEs.

      All Direct Costs associated with work done pursuant to the approved
Research & Development Plan shall be borne by Procter & Gamble.

            (b) Alexion's FTE Rate; Payment. Calculation of any FTE rate
includes salary


                                       16
<PAGE>

and benefits, bonuses and rewards, normal operating expenses (laboratory
supplies, chemicals, equipment maintenance and repairs, etc.) and normal
traveling expenses. Procter & Gamble's funding of Alexion's FTEs will be made
at an annual rate of Two Hundred Twenty-Five Thousand U.S. Dollars
($225,000.00) per FTE. Such rate shall be adjusted for inflation by
multiplying the amount in the contract by the percentage change in the U.S.
CPI for all Urban Consumers as published by the U.S. Bureau of Labor
Standards (the "CPI") for the period January 1999 to the June immediately
preceding the Fiscal Year in question. An example calculation of the CPI
adjustment is set forth in Schedule 4.2(b) delivered contemporaneously
herewith.

      4.3. Alexion Obligations. Alexion shall use Commercially Reasonable
Efforts to diligently perform the obligations of Alexion set forth in the
Research & Development Plan, within the resources provided by Procter &
Gamble. Such performance of the obligations hereunder by Alexion shall be at
Procter & Gamble's cost and expense pursuant to such Research & Development
Plan. To the extent not related to Alexion Patents or Joint Patents, all raw
data generated from any clinical or nonclinical studies conducted hereunder
by Alexion, and solely related to a Collaboration Inhibitor, in pursuance of
the Research & Development Plan, during the Collaboration Term, and during
the remaining Term of this Agreement, at Procter & Gamble's sole cost and
expense shall be the sole property of Procter & Gamble. Alexion shall
proceed diligently with the work to be performed by it as set out in the
Research & Development Plan by using its reasonable commercial efforts within
the resources provided by Procter & Gamble to provide allocation of
sufficient time and effort, using personnel with sufficient skills and
experience, to execute and substantially perform its obligations under the
Research & Development Plan. During the Collaboration Term, Alexion shall
commit such FTEs in its employ to the Research & Development Plan as
determined by the Research & Development Steering Committee on an annual
basis, subject to this Section 4.4 and Section 4.2.

      4.4. P&G Obligations. Procter & Gamble shall use the Commercially
Reasonable Efforts to diligently complete the development of Products pursuant
to the Research & Development Plan, and to diligently perform the obligations
set forth in the Research &


                                       17
<PAGE>

Development Plan. Procter & Gamble shall be responsible for all costs and
expenses in connection with such development efforts. In addition to Procter &
Gamble's obligation for funding pursuant to Section 4.2, Procter & Gamble agrees
to commit to the Research & Development Plan the resources which shall be
necessary to fulfill its obligation under the Research & Development Plan
(including extensions for the balance of the Collaboration Term).

      4.5. Research and Development Communication. Alexion and Procter & Gamble
will submit reports to each other not less than two (2) times per year
presenting a meaningful summary of research and development activities performed
under this Agreement. Alexion and Procter & Gamble will make presentations of
such activities to each other, beyond that made to the Research & Development
Steering Committee, as reasonably requested by each other. All technology
generated by the Parties in the course of the Agreement, in the Field, shall be
disclosed pursuant to Section 10.1. The Parties shall use their best efforts to
communicate information only within the scope of this Agreement. Alexion and
Procter & Gamble will also communicate informally and through the Research &
Development Steering Committee to inform each other of research and development
done under this Agreement. Alexion will provide Procter & Gamble with raw data
in original form or a photocopy thereof for any and all work carried out under
this Agreement as reasonably requested by Procter & Gamble. Further, each Party
shall keep complete and accurate records pertaining to the Parties' activities
hereunder consistent with the creation and maintenance of raw data, records and
reports necessary or useful in the preparation, approval and maintenance of
Health Registrations for Products and Marketed Products and sufficient to
enable, for example, the efficient transfer of Product manufacturing Know-how
from Alexion to P&G. All information provided under this Section 4.5 is subject
to Article X.

      4.6. Alexion Indications. During the term of the licenses granted to
Procter & Gamble pursuant to Article II, Alexion may propose to the Research &
Development Steering Committee indications which are not part of the Research &
Development Plan for clinical development (Alexion Indications). The Research &
Development Steering Committee shall evaluate the


                                       18
<PAGE>

proposed Alexion Indication within sixty (60) days of such proposal. If the
Research & Development Steering Committee shall deem the Alexion Indication not
worthy of development, no such development shall occur.

      If, however, the Research & Development Steering Committee shall deem the
Alexion Indication worthy of development, then (i) the Research & Development
Plan shall be so modified within such sixty (60) day period or (ii) the Parties
shall negotiate in good faith, within an additional sixty (60) day period, terms
for development of such Alexion Indication. If the Parties cannot agree on such
terms within ninety (90) days after Alexion proposes to Procter & Gamble an
Alexion Indication, then Alexion can proceed at its own cost to develop the
Alexion Indication in a manner approved by the Research & Development Steering
Committee. Any actions by Alexion under these conditions is contingent on such
actions being approved by the Research & Development Steering Committee and not
being to the disadvantage of the collaborative efforts under the Research &
Development Plan. At any time thereafter Procter & Gamble and Alexion will again
meet and negotiate in good faith terms to provide Procter & Gamble an
opportunity to buy back into the program for the development and
commercialization of the Alexion Indication. In any case, it is intended that
all work done on this indication continue to be discussed and approved by the
Research & Development Steering Committee.

      4.7. No Solicitation of Employees. During the Collaboration Term and for a
period of two (2) years thereafter, neither Alexion nor Procter & Gamble nor
their respective Affiliates shall, without the prior consent of the other Party,
solicit the employment of any person who during the course of employment with
the other party or its Affiliate was involved with activities relating to the
Research & Development Plan.

                      Article V - Manufacturing of Product

      5.1. Manufacturing of Product(s).

            (a) Alexion shall be responsible for process development and
production of Collaboration Inhibitor and Product for the Research & Development
Plan. To the extent such


                                       19
<PAGE>

activities are being conducted through Third Parties, the terms of such Third
Party agreement shall be approved by the Research & Development Steering
Committee. Procter & Gamble shall purchase for such purpose clinical bulk
material and/or vials of Product from Alexion at Alexion Product Cost calculated
according to GAAP, payable within thirty (30) days of invoice, and verifiable by
audit. Such supply of bulk material and vials of Product for clinical use shall
be in accordance with applicable specifications and requests made and approved
by the Research & Development Steering Committee.

            (b) Alexion shall have the continuing right, at its election, to
bid for the manufacture of all or a portion of the commercial requirements of
Product. Subject to the provisions of this paragraph, award of all or a
portion of the right to manufacture commercial Product shall be determined by
Procter & Gamble. If Alexion has in place or will have in place manufacturing
capacity and Alexion shall meet required QA, regulatory, manufacturing and
production criteria and its bid be at a price no higher than that offered by
a comparably qualified bona fide Third Party contract manufacturer, Alexion
shall have the right to manufacture all or a portion of such commercial
requirements of Products upon commercially reasonable terms no less favorable
to Procter & Gamble than that available from a comparably qualified
alternative source, to be negotiated by Alexion and the Research &
Development Steering Committee or Procter & Gamble, as the case may be. In
the event the Parties are unable to reach agreement, either Party shall be
entitled to submit the matter for settlement by arbitration in accordance
with Section 14.4. During such periods as Alexion shall not be manufacturing
all of the requirements of Product, Alexion shall be entitled to recommend
the other contract manufacturing source, subject to final approval by the
Research & Development Steering Committee or Procter & Gamble. Alexion shall
fully cooperate in the license and transfer of the requisite manufacturing
know-how to such Third Party contract manufacturer as Procter & Gamble
determines.

                                       20
<PAGE>

                   Article VI - Health Registration Obligation

      Seeking Approvals. Procter & Gamble and its Affiliates will be the sponsor
of Health Registrations where applicable in the Territory. Procter & Gamble and
Alexion shall share responsibilities for Health Registration filings,
interactions and correspondences related to the development, registration and
approval of a Product within the Territory. Alexion shall have primary
responsibility for the CMC part of regulatory filings. Alexion shall transfer
sponsorship of all current Health Registration applications for Products to
Procter & Gamble as established by the Research & Development Steering
Committee. To the extent that Alexion intends to develop an Alexion Indication,
the Research & Development Steering Committee shall provide the necessary access
to any regulatory filings (including applications for Health Registrations). All
costs associated with the Health Registration filings shall be borne by Procter
& Gamble.

                       Article VII - Marketing of Products

      7.1. Marketing and Sales Strategy. As set forth herein, Procter &
Gamble shall make all decisions regarding the strategy and tactics of
marketing, selling and otherwise commercializing Marketed Products, including
without limitation prices of Marketed Products, method of sales and
distribution, organization and management of sales and marketing, packaging
and labeling, appointment of distributors pursuant to Section 7.2, extent of
Alexion's co-promotional activity pursuant to Section 7.3, and other terms
and conditions for such sales and marketing. Notwithstanding the foregoing,
Procter & Gamble will use Commercially Reasonable Efforts to commercialize
each Product that receives Regulatory Approval, taking into account the
scientific and commercial potential for such Product. Alexion will provide
thirty (30) days' notice to Procter & Gamble, if, in Alexion's opinion,
Procter & Gamble is not using such commercially reasonable and diligent
efforts, in order for the Parties to discuss the situation and for Procter &
Gamble to make diligent and continuing efforts to rectify the situation. If
the Parties agree that Procter & Gamble is not using such commercially
reasonable and diligent efforts, Procter & Gamble shall have an additional
sixty (60) days to rectify the situation. If no agreement is made within the
thirty (30) day period, then the matter may be taken to arbitration

                                       21
<PAGE>

pursuant to Section 14.4.

      7.2. Exclusive Distributor. Subject to Section 7.3 below, Procter & Gamble
may elect a Third Party to act as its agent in connection with the marketing,
sale and distribution of Marketed Products on a country basis in the Territory.
No amounts payable to or retained by any such agent shall affect the calculation
of Net Sales.

      7.3. Alexion Co-Promotional Activities. Alexion will have an
opportunity, but not the obligation, to participate in the sales efforts in
the United States of a minimum twenty percent (20%) of a Marketed Product's
sales effort. Upon the Research & Development Steering Committee's decision
to prepare a Health Registration in the United States, Procter & Gamble shall
provide a written request to Alexion regarding Alexion's intent to co-promote
the Marketed Product. Said request shall contain a comprehensive Product
marketing plan, and number of details and position, as defined in Schedule
7.3 (not less than 20% of total details to Alexion) and rate of reimbursement
to Alexion. Within thirty (30) days of receipt, Alexion shall provide its
written response. Should Alexion elect to participate, the Parties will
immediately begin negotiations to enter into a Co-Promotional Agreement. Said
Agreement will incorporate traditional provisions including but not limited
to those set forth in Schedule 7.3. Alexion shall be solely responsible for
hiring and funding the establishment of its internal sales organization.
Procter & Gamble shall pay Alexion an amount equal to Procter & Gamble's
costs for details and sales call position as if such details were made by
Procter & Gamble's dedicated field-based sales force or trained contract
sales force. Calculation of reimbursement to Alexion will be determined
according to the proportion of dedicated field-based sales force or trained
contract sales force that Procter & Gamble will employ for the promotion of
Product in the U.S.

      7.4. No Restrictions on Business. Except as otherwise specifically
provided herein, Alexion agrees that Procter & Gamble is in the business of
developing, manufacturing and selling of pharmaceutical products and nothing in
this Agreement shall be construed as restricting such business or imposing on
Procter & Gamble the duty to market and sell Marketed Products hereunder to the
exclusion of or in preference to any other product, provided such


                                       22


<PAGE>

product is not a Competing Product.

          Article VIII - Milestones, Royalties, Payments and Accounting

      8.1. Milestones. In consideration of Alexion's commitment to conduct the
Research & Development Plan and for the licenses granted hereunder, Procter &
Gamble agrees to pay, in addition to funding all of the research and development
costs related to Product incurred during this Agreement pursuant to Section 4.2,
the following non-refundable, non-creditable one-time milestone payments to
Alexion, contingent upon meeting the following milestones as follows:

<TABLE>
<CAPTION>
                     Milestone                                        Amount
                     ---------                                        ------
                                                                  (US $ Million)
<S>                                                               <C>
Pre-Health Registration Events

Upon execution of this Agreement                                     [*****]




         [**********]





U.S. Health Registration Events



         [**********]






</TABLE>

                                  23

<PAGE>


         [**********]

Foreign Health Registration Events





         [**********]




      8.2. Royalty Calculation.

            (a) Procter & Gamble will pay to Alexion a royalty on Annual
Contribution (to be defined in and calculated in accordance with Schedule
8.2(a)) of a Product on a worldwide basis,
sold by Procter & Gamble, its Affiliates and sublicensees (including sales by
distributors) in the Territory at the applicable rate listed below multiplied
by the Annual Contribution:

                             Annual
                          Contribution                  Royalty
                          ------------                  -------
                            (US$)



                                         [********]




       For example, if Annual Contribution in 1998 was [*****], Procter &
       Gamble would pay Alexion [*****] Million [*****].

      If however, such royalty payment based on Annual Contribution in any
year was less than a sum equal to [*****] of that year's annual Net Sales of
the Products, then Procter & Gamble shall pay Alexion a total percentage
payment for that year equal to [******] of that year's annual Net
Sales. With respect to each Product sold by Procter & Gamble,

                                       24
<PAGE>

its Affiliates or sublicensees, Procter & Gamble shall pay Alexion hereunder,
on a country by country basis, until the expiration of the period equal to
the longer of (a) or (b) where (a) is the longer of (i) [*****] In countries in
which there exist a non-infringing, marketed generic equivalent product (a
product recognized and approved by the relevant regulatory authorities as
pharmaceutically equivalent, directly substitutable and equivalent to the
Marketed Product) in which sales of such product in such country by such
Third Party exceed [*****] of sales of the Product, then the royalties payable
by Procter & Gamble to Alexion pursuant to Section 8.2(a) shall be [*****].
Notwithstanding anything else in this Agreement, such royalties shall not in
any event be lower than the aggregate royalties payable by Alexion to its
licensors of Licensed Technology with respect to Products.

            (b) In the case of Product sales in a country wherein (a) [*****]

            (c) In addition to the royalties paid pursuant to Section 8.2(a) or
(b), Procter & Gamble will also pay Alexion the following additional milestone
payments based on Net Sales. These are one-time only payments triggered on the
first occurrence where total Fiscal Year Net Sales for Products exceeds Net
Sales threshold levels described below:


                                       25
<PAGE>

                                                              Sales
                                                            Milestone
                  Net Sales                                  Payments
                  ---------                                  --------
                    (US$)                                 (US $ Million)

                                     [*****]

       All payments will be made pursuant to Section 8.5(d). An example
       calculation is set forth in Schedule 8.2(c) delivered contemporaneously
       herewith.

      * The Annual Contribution threshold levels in Section 8.2(a) and Net Sales
threshold levels in Section 8.2(c) shall be adjusted for inflation by
multiplying the value in the contract by the percentage change in the U.S. CPI
for all Urban Consumers as published by the U.S. Bureau of Labor Standards (the
CPI) for the period from January 1999, to the June immediately preceding the
Fiscal Year in question. An example calculation of the CPI adjustment is set
forth in Schedule 4.2(b) delivered contemporaneously herewith.

      8.3. Sublicense Agreements. If Procter & Gamble, an Affiliate or
sublicensee of Procter & Gamble sublicenses Alexion Patents or Alexion
Know-how pursuant to Article V, or licenses or sublicenses Joint Patents,
Procter & Gamble shall pay to Alexion fifty percent (50%) of all amounts
received from the sublicensee or licensee, including without limitation,
amounts in respect of initiation, milestone and performance payments, an
advance against royalties or otherwise, and Procter & Gamble shall be
entitled to a credit against total royalties payable in accordance with
Section 8.2(a) of all amounts paid to Alexion under this Section 8.3 for
which Procter & Gamble's licensee or sublicensee shall be entitled to a
credit against royalties or other amounts payable to Procter & Gamble under
the terms of the applicable license or sublicense agreement delivered to
Alexion in accordance with Section 2.3.

                                       26
<PAGE>

      8.4. Cash Only. Procter & Gamble shall not receive from sublicensees
anything of value in lieu of cash payments in satisfaction of payment of
obligations under a sublicense and this Agreement unless the express written
permission of Alexion is obtained in advance. Procter & Gamble shall be entitled
to receive rights to improvements and other benefits from sublicensees under
sublicense agreements, without incurring any royalty obligations to Alexion in
respect thereof.

      8.5. Payment.

            (a) Milestones payable under Section 8.1 will be paid not later than
ten (10) calendar days following the event.

            (b) The FTE-based and other funding contemplated by Section 4.2
shall be payable quarterly during each Contract Year. Within 10 days of the
Effective Date, Procter & Gamble will pay Alexion the pro rata payment for
minimum FTEs for the first quarter of the first Contract Year.

            (c) Royalties payable under Section 8.2(a) and (b) and amounts
payable under Section 8.3 will be paid not later than fifty-five (55) calendar
days following the end of each Fiscal Quarter. All payments shall be accompanied
by a report in writing showing on a country by country basis for the Fiscal
Quarter for which such payment applies, the amount billed to Third Parties for
Products sold during such Fiscal Quarter, the deductions from the amount billed
to arrive at the Annual Contributions, the Annual Contributions for the Fiscal
Quarter, and the royalties due on such Annual Contributions, such report being
broken down by Marketed Product.

            (d) Royalties payable under Section 8.2(c) will be paid not later
than fifty-five (55) calendar days following the end of each Fiscal Year. All
payments shall be accompanied by a report in writing showing the Fiscal Year for
which such payment applies, the Net Sales for the Fiscal Year, and the royalties
due on such Net Sales, such report being broken down by Marketed Product.

            (e) Within ninety (90) days after the end of each Fiscal Year during
the term of this Agreement commencing with the year during which the first
commercial sale of a Product


                                       27
<PAGE>

shall occur, Procter & Gamble shall provide to Alexion a report, prepared by
Procter & Gamble, relating to the sale of Products, containing:

            (i) the total Net Sales of all Products sold by Procter & Gamble, it
      Affiliates and its sublicensees during such year; and

            (ii) the amounts owed to Alexion pursuant to this Agreement with
      respect to such year.

            (f) Any amounts owed pursuant to Sections 8.2(a), 8.2(b), 8.2(c) or
8.3 shall be paid in U.S. dollars using the average rate of exchange for the
currency of the country from which the royalties are payable for the applicable
period. Rates are averaged using those quoted in The Wall Street Journal (or
Citibank, N.A. if such rates are not available in The Wall Street Journal).

            (g) Alexion shall submit a report to Procter & Gamble within sixty
(60) days after the end of each Fiscal Quarter detailing the number of Alexion
FTEs performing work pursuant to the Research & Development Plan, detailed
description of such work and other costs incurred pursuant to Section 4.2.
Alexion shall submit invoices in U.S. dollars to Procter & Gamble. Invoices
submitted to Procter & Gamble pursuant to this Section 8.5(g) are payable net
thirty (30) days after receipt and are subject to audit by Procter & Gamble in
addition to the audit provision pursuant to Section 8.8.

            (h) All payments due under this Article VIII will be deposited by
Electronic Funds Transfer in a bank chosen by Alexion by the date due. Any
amounts or royalties prohibited from export by a particular country will be
deposited in a bank chosen by Alexion in such country. Any deductions for
withholding taxes imposed by the country in which Net Sales take place will be
withheld and paid as required by law. The amount of tax withheld shall be for
the account of Alexion. Procter & Gamble will provide prompt evidence of payment
of such taxes to the governmental or taxing authority. Procter & Gamble will
assist Alexion in claiming relief from double taxation and shall use reasonable
efforts to minimize any income taxes required to be withheld on behalf of
Alexion by Procter & Gamble, its Affiliates or sublicensees, and promptly shall
deliver to Alexion copies of all communications from or with such governmental
authority with respect thereto.

            (i) Procter & Gamble shall report sales of Products by its
sublicensees and


                                       28
<PAGE>

pay royalties on such sales on the same basis as if such sales had been made by
Procter & Gamble. Procter & Gamble shall ensure that its sublicense agreements
obligate sublicensees to pay royalties and report on such a basis, and shall
further give Alexion a right to require (to the extent permitted under the
applicable sublicense agreement) that Procter & Gamble initiate an audit of such
sublicensees' books. Alexion shall reimburse Procter & Gamble for Auditing costs
initiated at Alexion's request should the Auditor determine the cumulative
material discrepancy (Procter & Gamble and Sublicensee) is less than 3%.

      8.6. Records. Procter & Gamble (and its Affiliates and Sublicensees) and
Alexion (and its Affiliates) will maintain, and will require their Affiliates to
maintain, complete and accurate written records which are relevant to costs,
expenses and payments under this Agreement and such records shall be open for
inspection by a designated representative of the other Party with reasonable
notice during reasonable business hours for a period of five years from creation
of individual records. Such inspections are limited to two times per year.

      8.7. Interest Rate. Unless otherwise provided in this Agreement, any
payments past due will bear interest at the prime rate (such quoted in The Wall
Street Journal on the first day of the month of the accrual) plus two (2)
percentage points, compounded monthly.

      8.8. Audit. Not more than once in any Fiscal Year and upon reasonable
advance notice to the other party to this Agreement, Alexion or Procter &
Gamble, as the case may be (the "Requesting Party"), shall be entitled to
nominate a reasonably acceptable representative or independent certified public
accountants reasonably acceptable to the other party to have access at
reasonable times during normal business hours and upon reasonable prior notice
(subject to signing a confidentiality agreement) to (a) Procter & Gamble's, its
Affiliates' or sublicensees' records for Annual Contribution and Net Sales of
Products (such audit of Procter & Gamble's sublicensee shall be initiated by
Procter & Gamble), as the case may be, as they relate to the relevant Products
for the purpose of verifying Procter & Gamble's calculation of royalty payments
due hereunder or (b) Alexion' s records for Alexion' s calculation of FTE costs,
Alexion Product Cost and any other costs to be paid by Procter & Gamble. Such
accounting firm


                                       29
<PAGE>

shall not disclose to the Requesting Party or to any third party any financial
or other information relating to the business of the party whose records are
being audited (the "Audited Party") except that which is necessary to inform the
Requesting Party of the accuracy or inaccuracy of the Audited Party's
calculation. Should such accounting firm discover information indicating, in its
opinion, an inaccuracy in the calculation of the royalty payments or the Alexion
expenses subject to payment by Procter & Gamble, as the case may be, it shall so
notify the parties in writing thereof (and shall set out its preliminary
conclusions in reasonable detail).

      The Audited Party shall advise the Requesting Party in writing within ten
business days of receiving such notice should the Audited Party disagree with
the determination of such representative or accounting firm. During the next 20
business days, such representative or accounting firm and the accountants of the
Audited Party shall attempt to resolve the issue in dispute. Failing such
agreement within such 20 day period, the accounting firm of the Requesting Party
and the accountants of the Audited Party shall appoint another independent,
nationally recognized accounting firm to conduct its own audit. The
determination by such second accounting firm (the "Auditors") shall be final and
binding on the parties. Any payments owed by the Audited Party shall be made
within ten (10) days of the Audited Party's receipt of the Auditor's
determination.

      In the absence of material discrepancies (in excess of 3%) in any
request for reimbursement or audit resulting from such examination or audit,
the accounting expense shall be paid by the Party requesting the examination
or audit. If material discrepancies adverse to the Party requesting the
examination or audit do result, the Audited Party shall bear the accounting
expenses.

      Notwithstanding the foregoing, neither Party shall audit the same records
twice.


                                       30
<PAGE>

                Article IX - Patents, Trademarks and Infringement

      9.1. Disclosure. Alexion shall disclose to Procter & Gamble Know-how,
patents and developments in the Field included within Alexion Patents and
Alexion Know-how known prior to the Effective Date. Further, each Party shall
promptly disclose to the other Party any invention or Know-how or other
developments in the Field. Invention disclosures in the Field will be disclosed
in the normal course of the Agreement. Such disclosures will be made pursuant to
Article X.

      9.2. Alexion Obligation. Alexion shall take all such actions within its
control required to maintain rights to Licensed Technology which is part of
Alexion Patents and Alexion Know-how and, where necessary, subject to Section
2.4(b), shall take such action as Procter & Gamble reasonably deems necessary to
enable Alexion to maintain such licenses, subject to the payment and performance
by Procter & Gamble of its obligations and responsibilities under this Agreement
and provided, that Alexion shall not be required to pay any licensor any funds
in respect of Sales by Procter & Gamble, its Affiliates or sublicensees which it
has not received from Procter & Gamble.

      9.3. Patent Applications. Alexion and Procter & Gamble will discuss and
evaluate technology disclosed pursuant to Section 9.1, and confer regarding the
advisability of filing patent applications to cover any technology resulting
from the collaboration under this Agreement. The Party responsible for the
filing, prosecution and maintenance of patent applications (herein "Responsible
Party") shall be: (a) Procter & Gamble, if the subject invention is made solely
by employees of Procter & Gamble; or (b) Alexion, if the subject invention is
made solely by employees of Alexion or a licensor or agent thereof or (c)
determined by agreement of the Parties for all other inventions, taking into
account the nature of the invention and the relationship of the invention to
inventions claimed in other patents or applications. Any patent `for an
invention conceived or reduced to practice regarding technology during the
Agreement shall be owned: (i) by Alexion (and shall be an Alexion Patent), if
said invention is conceived and reduced to practice solely by employees of
Alexion; (ii) by Procter & Gamble


                                       31
<PAGE>

(and shall be a Procter & Gamble Patent with respect to a Product) if said
invention is conceived and reduced to practice solely by employees of Procter &
Gamble; and (iii) by Procter & Gamble and Alexion (and shall be a Joint Patent),
if said invention is conceived and reduced to practice by employees of Procter &
Gamble and Alexion. Inventorship shall be determined according to the laws of
the USA. Any dispute regarding the inventorship of an invention made under the
Research & Development Plan shall be resolved by the decision of independent
patent counsel, mutually acceptable to the Parties, after consideration of all
evidence submitted by the Parties, except to the extent such decision is
inconsistent with the subsequent determination of the appropriate patent or
judicial authorities. Filing, prosecution, maintenance and enforcement of such
Patents shall be handled pursuant to Article IX. Alexion and Procter & Gamble
will discuss with each other the advisability of filing Patent applications
beyond the priority country.

      9.4. Filing and Prosecution of Patents. The Responsible Party shall
diligently file, prosecute, seek prompt issuance of, and maintain patent
applications according to its own internal standards for effectively covering
other inventions made by its employees or consultants. The Responsible Party
will endeavor to ensure that all patent applications are filed before any public
disclosures so as to ensure validity of patent applications filed outside of the
United States. The Responsible Party will submit a substantially complete draft
of each patent application to the other Party at least thirty (30) days prior to
the contemplated filing date and consider any comments of the other Party,
provided that in those circumstances where the Responsible Party believes time
is of the essence, the Responsible Party will endeavor to provide the other with
such advance notice as it reasonably can under the circumstances. Alexion and
Procter & Gamble will confer with each other regarding the prosecution of such
Patent Applications and will copy each other with any official action and
submission in such Patent Applications. Except where otherwise noted, Procter &
Gamble will be responsible for expenses associated with filing, prosecution and
maintenance of Procter & Gamble patents and Alexion will be responsible for
expenses associated with its patents.

      9.5. Alternate Responsibility for Prosecution. In the event a Party
determines that it will not file, prosecute or maintain, a Patent in the Field
in a particular country, it shall promptly


                                       32
<PAGE>

notify the other Party, and such other Party shall then have the right, but not
obligation, to assume responsibility for the Patent, and thereby become the
Responsible Party for that Patent pursuant to Section 9.3. Such other Party
shall be given all necessary authority by the Party not so filing, prosecuting
or maintaining the Patent to file, prosecute, and maintain the Patent at the
expense of such other Party.

      9.6. Infringement of Patents. Procter & Gamble and Alexion shall promptly
notify the other in writing of any infringement of a Patent within the Patent
rights licensed or to be licensed pursuant to Article II of which they become
aware. Procter & Gamble and Alexion shall also promptly notify the other party
in writing of any patent rights a Third Party may assert against a Product or
Marketed Product.

      9.7. Enforcement of Patents.

            (a) Third Party Licenses. If (a) Procter & Gamble believes that a
license to a Third Party patent is necessary for sale of Products in a
country outside the United States and (b) Alexion does not agree that such
Third Party license is necessary, then the Parties will submit the issue to a
mutually acceptable independent counsel who will determine whether such Third
Party license is necessary for sale of such Product in such country. If such
independent counsel determines that such Third Party license is necessary for
sale of Products in such country, or if Alexion agrees with Procter &
Gamble's assessment, the Parties will share license costs, with Alexion
responsible for 10% of such costs and Procter & Gamble responsible for 90% of
such costs. If such independent counsel determines that such license is not
necessary, Procter & Gamble may execute such Third Party license and be
responsible for all such costs.

            (b) Defense and Settlement of Third Party Claims. If a Third Party
asserts that a patent or other right owned by it is infringed by the
manufacture, use or sale of any Product, then Procter & Gamble shall have the
right but not the obligation to defend against any such assertions at its own
expense, and Alexion shall have the right at its own expense to be represented
by counsel of its own choice. In the event that Procter & Gamble declines to
defend against such Third Party assertion, or Procter & Gamble fails to defend
within sixty (60) days, then Alexion may defend against such assertion at its
own expense.


                                       33
<PAGE>

            (c) Infringement of Licensed Technology by Third Parties with
Respect to Products. If any exclusively licensed Licensed Technology appears to
be infringed by a Third Party in any country in connection with the manufacture,
use, offer for sale, or sale of any Product or a functionally equivalent
competitive product in such country, the Party to this Agreement first having
knowledge of such infringement shall promptly notify the other in writing. The
notice shall set forth the facts of that infringement in reasonable detail, to
the knowledge of the Party. Alexion shall have the primary right, but not the
obligation, to institute, prosecute, and control any action or proceeding with
respect to such infringement, by counsel of its own choice, and Procter & Gamble
shall have the right, at its own expense, to be represented by counsel of its
own choice. If Alexion fails to bring an action or proceeding within a period of
twenty-five (25) days after having knowledge of infringement of an Alexion
Patent or a Joint Patent, Procter & Gamble shall have the right to bring and
control any such action by counsel of its own choice. Alexion will retain
control of non-exclusively licensed Licensed Technology and Procter & Gamble
shall have the right to be represented in any such action by counsel of its own
choice at its own expense. If one Party brings any such action or proceeding,
the other Party agrees to be joined as a party plaintiff if necessary to
prosecute the action and to give the first Party reasonable assistance and
authority to file and prosecute the suit. No Party shall be obligated to bring
or maintain more than one such suit at any time with respect to claims directed
to any one method of manufacture or composition of matter or method of use.

            (d) Infringement of Certain Exclusively Licensed Alexion Patents
other than Licensed Technology or Joint Patents by Third Parties with Respect to
Products. If an exclusively licensed Alexion Patent, not including Licensed
Technology, or Joint Patent appears to be infringed by a Third Party in any
country in connection with the manufacture, use, offer for sale, sale or import
of any product including Product, the Party to this Agreement first having
knowledge of such infringement shall promptly notify the other in writing. The
notice shall set forth the facts of that infringement in reasonable detail, to
the knowledge of the Party. Procter & Gamble shall have the primary right, but
not the obligation to institute, prosecute, and control any action or proceeding
with respect to such infringement of such exclusively licensed Alexion Patent or
Joint Patent by counsel of its own choice, and Alexion shall have the right, at
its own expense, to be represented in any action involving an exclusively
licensed Alexion Patent or a


                                       34
<PAGE>

Joint Patent by counsel of its own choice. If Procter & Gamble fails to bring an
action or proceeding within a period of twenty-five (25) days after having
knowledge of infringement, Alexion shall have the right to bring and control any
such action by counsel of its own choice, and Procter & Gamble shall have the
right to be represented in any action by counsel of its own choice at its own
expense. If one Party brings any such action or proceeding, the other Party
agrees to be joined as a party plaintiff if necessary to prosecute the action
and to give the first Party reasonable assistance and authority to file and
prosecute the suit. If the Parties do not agree on a common course of action for
any other such Patent within sixty (60) days following the notice provided under
this Section 9.7, each Party may take such action as it determines to be in its
best interest with respect to such apparent infringement.

            (e) Infringement of Procter & Gamble Patent by Third Parties with
Respect to Products. If a Procter & Gamble Patent appears to be infringed by a
Third Party in any country in connection with the manufacture, use, offer for
sale, sale or import of any Product, the Party to this agreement first having
knowledge of such infringement shall promptly notify the other in writing. The
notice shall set forth the facts of that infringement in reasonable detail to
the knowledge of the Party. Procter & Gamble shall have the right, but not the
obligation, to institute, prosecute, and control any action or proceeding with
respect to such infringement.

            (f) Monetary Awards. Any damages or other monetary awards
recovered by reason of litigation under Section 9.7(b), 9.7(c) or 9.7(d)
shall be allocated first to the costs and expenses of the Party bringing
suit, then to the costs and expenses, if any, of the other Party. Any amounts
remaining designated as lost profits shall be allocated to the Parties in a
manner such that Alexion receives as nearly as possible the same amount as if
Procter & Gamble had made Net Sales resulting in such lost profit. Any other
amounts remaining shall be allocated fifty percent (50%) to the Party
bringing suit and fifty percent (50%) to the other Party. No settlement or
consent judgment or other voluntary final disposition of a suit under Section
9.7(b), (c) or (d) may be entered into without the consent of the Party not
bringing the suit if such settlement, judgment or other disposition shall
waive or affect any rights of the Party not bringing the suit or could result
in the payment of money or impose any obligation on the Party not bringing
the suit.

                                       35
<PAGE>

      9.8. Trademarks. Procter & Gamble shall file, prosecute and maintain all
trademark applications and registrations for trademarks to be used for Products
or Marketed Products. Procter & Gamble shall pay all expenses in connection with
filing and prosecution of such trademarks which shall be owned by Procter &
Gamble.

      9.9. Trademark Infringement and Enforcement. Alexion shall promptly notify
Procter & Gamble of any infringement of a trademark under this Section 9.9 of
which they become aware. Procter & Gamble may, but shall not be required to,
prosecute any such alleged infringement or threatened infringement. Alexion
shall cooperate fully with Procter & Gamble in such action. Any recovery
obtained shall belong to Procter & Gamble.

      9.10. Unauthorized Use of Patent Rights. Neither Party shall willfully
take any action which would, directly or indirectly, infringe, or induce or
contribute to the infringement of, one or more claims of any issued Patent of
the other Party or its Affiliates, except to the extent such action is
authorized by a license granted under this Agreement. If either Party takes any
action, directly or indirectly, to challenge the validity of any issued patent
of the other Party or its Affiliates, then the other Party shall have the right
in its sole discretion to terminate the Research & Development Plan; provided,
however, in the circumstances where the challenged patent is included within the
patent rights of the other Party, the other Party additionally shall have the
right to terminate the licenses granted under Article V above, to the extent
permitted by law, on a country-by-country basis. A Party shall not be entitled
to withhold payment of any royalty accruing during any challenge to the validity
of a patent included within the patent rights of the other Party.

                           Article X - Confidentiality

      10.1. Confidentiality and Non-Use Obligations. Each Party shall maintain
in confidence all information (herein "Information") which is:


                                       36
<PAGE>

            (a) disclosed to it by the other Party pursuant to Section 9.1;

            (b) developed by the Party during the Term in the course of
performance of the obligations under this Agreement;

            (c) the terms of the Agreement; or

            (d) other information ("Other Information") disclosed by the other
Party which is outside the Field or otherwise not within the scope of the
collaboration and which is considered confidential by the other Party, and so
designated as confidential in writing when first disclosed or within thirty (30)
days after disclosure if the first disclosure is oral (except for patent
applications and related correspondence which shall be deemed confidential
without being marked or any such designation).

      The Party shall take all reasonable precautions to:

            (a) prevent disclosure of such Information to Third Parties, except
as set forth in Section 10.3 and Section 14.10, or as may be necessary for the
filing or prosecution of patent applications pursuant to Article IX; and

            (b) use Patents and Know-how pursuant to the rights and obligations
of the Party pursuant to Article II.

      The Party shall not use Other Information for any purpose.

      These restrictions upon disclosure and use of Information shall terminate
ten (10) years after the date of the termination of the Agreement, but shall not
apply to any specific portion of Information which:

                  (i) is Information which can be demonstrated by the recipient
            to have already been in the possession of the recipient at the time
            of disclosure by the other Party;

                  (ii) is or later becomes available to the public, as evidenced
            by documents which were generally published, other than by default
            by the Party;

                  (iii) is received from a Third Party having legitimate
            possession thereof and the independent legal right to make such
            disclosure;

                  (iv) is Other Information developed by the Party entirely
            without reference or use of Information, as established by probative
            documentary evidence; or

                  (v) is required to be disclosed by law or government
            regulation.


                                       37
<PAGE>

      10.2. Prior Non-Disclosure Agreements. The "Non- Disclosure Agreement"
dated July 16, 1998 between Alexion Pharmaceuticals, Inc. and Procter & Gamble
have separately been rendered void and all Information to be kept confidential
under such agreements as of the Effective Date will be subject to the terms of
Section 10.1 as if disclosed under this Agreement.

      10.3. Research Manuscripts and Abstracts. It is understood that either
Party may publish or otherwise disclose the results of the Research &
Development Plan or of development studies of Collaboration Inhibitor in a
reputable scientific forum (for example, as an abstract, poster presentation,
lecture, article, book, or any other means of dissemination to the public). Such
disclosures may be made to a Third Party with the approval of the Research &
Development Steering Committee regarding (x) preclinical research; (y) clinical
research disclosures after a final report exists, if disclosure presents no
significant risk to regulatory filings and serves a compelling business reason
for publication; and (z) other work by the Parties, upon approval by the
Research & Development Steering Committee. No such disclosure shall be made to a
Third Party until a patent application has been filed adequately describing and
claiming any patentable technology embodied in such disclosure, pursuant to
Article VII. A party wishing to make any such disclosure shall submit a complete
written draft of the disclosure to the other Party at least thirty (30) days
prior to submission for the disclosure to a Third Party. The Party shall
consider any comments from the other Party. Any disputes regarding the
appropriateness, content and authors of any such disclosure shall be resolved by
the Research & Development Steering Committee.

                  Article XI -- Representations and Warranties

      11.1. Governmental Compliance. Both Parties shall comply with all laws,
rules and regulations applicable to the activities undertaken by both Parties
hereunder.


                                       38
<PAGE>

      11.2. Alexion Representations and Warranties.

            (a) Alexion represents and warrants to Procter & Gamble the
following, which shall be true and correct as of the Effective Date:

            (i) Organization and Good Standing. Alexion is a corporation duly
      organized, validly existing, and in good standing under the applicable
      laws of incorporation and has full corporate power to own its properties
      and conduct the business presently being conducted by it, and is duly
      qualified to do business in, and is in good standing under, the laws of
      all states and nations in which its activities or assets require such
      status, except in any case where the failure to be so qualified and in
      good standing would not be material.

            (ii) Power and Authority. Alexion has full corporate right, power
      and authority to perform its obligations pursuant to this Agreement, and
      this Agreement and the transactions contemplated hereby have been duly and
      validly authorized by all necessary corporate action on the part of
      Alexion. This Agreement has been duly and validly executed by Alexion.
      Upon execution and delivery of this Agreement, it will be the valid and
      binding obligation of Alexion enforceable in accordance with its terms,
      subject to equitable principles and applicable bankruptcy, insolvency,
      reorganization, moratorium and similar laws affecting creditor's right and
      remedies generally.

            (iii) Violations and Consent. The execution, delivery and
      performance of this Agreement does not, and the consummation of the
      transactions therein contemplated will not violate any law, rule,
      regulation, order, judgment or decree binding on Alexion or result in a
      breach of any term of the certificate of incorporation or by-laws of
      Alexion or any contract, agreement or other instrument to which Alexion is
      a party, except in each case to an extent not material.

      (b) Alexion represents and warrants to Procter & Gamble the following,
which shall be true and correct as of the Effective Date:

            (i) to the best of Alexion's knowledge, Alexion has disclosed to
            Procter & Gamble technical, scientific and regulatory information
            relating to the Collaboration Inhibitor, and has not intentionally
            withheld any such material technical, scientific or regulatory
            information; and


                                       39
<PAGE>

            (ii) it owns or Controls under valid licenses the requisite rights
            to grant the licenses granted by it hereunder; and

            (iii) Alexion has no actual knowledge of any information rendering
            invalid or unenforceable any Patent licensed to Procter & Gamble
            under Article II. Alexion will promptly inform Procter & Gamble

            if it obtains such information after the Effective Date. Alexion has
            no actual knowledge of any Patents and Know-how owned by a Third
            Party that Alexion believes will prevent, inhibit, or limit the
            Parties from conducting the research, development and
            commercialization activities under this Agreement. Alexion warrants
            that, except with respect to the agreements for the Licensed
            Technology, it has not entered into any agreement with a Third Party
            that Alexion believes will prevent, inhibit, or limit the Parties
            from conducting the research, development and commercialization
            activities under this Agreement.

      EXCEPT AS OTHERWISE PROVIDED IN THIS AGREEMENT, ALEXION MAKES NO
      REPRESENTATION OR WARRANTY OF ANY KIND WITH RESPECT TO THE ALEXION
      PATENTS, ALEXION KNOW-HOW, COLLABORATION INHIBITOR OR OTHER LICENSED
      TECHNOLOGY OR PRODUCTS, AND EXPRESSLY DISCLAIMS ANY WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AND ANY OTHER IMPLIED
      WARRANTIES WITH RESPECT TO THE CAPABILITIES, SAFETY, UTILITY OR COMMERCIAL
      APPLICATION OF ALEXION PATENTS, ALEXION KNOW-HOW, COLLABORATION INHIBITOR
      OR OTHER LICENSED TECHNOLOGY OR PRODUCTS.

      ALEXION AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DIRECT,
      CONSEQUENTIAL OR OTHER DAMAGES SUFFERED BY PROCTER & GAMBLE OR ANY OTHERS
      RESULTING FROM THE USE OF THE ALEXION


                                       40
<PAGE>

      PATENTS, ALEXION KNOW-HOW, COLLABORATION INHIBITOR OR OTHER LICENSED
      TECHNOLOGY OR PRODUCTS EXCEPT IN THE CASE OF ALEXION AS IT RELATES TO
      DIRECT DAMAGE PURSUANT TO ARTICLE XII.

      11.3. Representations and Warranties of Procter & Gamble.

            (a) Procter & Gamble represents and warrants to Alexion the
following, true and correct on the Effective Date:

            (i) Organization and Good Standing. Procter & Gamble is a
      corporation duly organized, validly existing, and in good standing under
      the applicable laws of incorporation and has full corporate power to own
      its properties and conduct the business presently being conducted by it,
      and is duly qualified to do business in. and is in good standing under,
      the laws of all states and nations in which its activities or assets
      require such status, except in any case where the failure to be so
      qualified and in good standing would not be material.

            (ii) Power and Authority. Procter & Gamble has full corporate right,
      power and authority to perform its obligations pursuant to this Agreement,
      and this Agreement and the transactions contemplated hereby have been duly
      and validly authorized by all necessary corporate action on the part of
      Procter & Gamble. This Agreement has been duly and validly executed by
      Procter & Gamble. Upon execution and delivery of this Agreement, it will
      be the valid and binding obligation of Procter & Gamble enforceable in
      accordance with its terms, subject to equitable principles and applicable
      bankruptcy, insolvency, reorganization, moratorium and similar laws
      affecting creditor's rights and remedies generally.

            (iii) Violations and Consent. The execution, delivery and
      performance of this Agreement does not, and the consummation of the
      transactions therein contemplated will not violate any law, rule,
      regulation, order, judgment or decree binding on Procter & Gamble or
      result in a breach of any term of the certificate of incorporation or
      by-laws of Procter & Gamble or any contract, agreement or other instrument
      to which Procter & Gamble is a party, except in each case to an extent


                                       41
<PAGE>

      not material. No authorization is required by Procter & Gamble for the
      execution, delivery, or performance of this Agreement by Procter & Gamble,
      except in each case to an extent not material.

            (iv) Evaluation. Procter & Gamble possesses the expertise and skill
      in the technical areas in which the Alexion Patents, Alexion Know-how,
      Collaboration Inhibitor and Products are involved necessary to make, and
      has made its own evaluation of the capabilities, safety, utility and
      commercial application of the Alexion Patents, Alexion Know-how,
      Collaboration Inhibitor and Products.

      11.4. Limitation on Warranties. The Parties understand that the research
and development work to be conducted pursuant to this Agreement will involve
untested, experimental, and currently undeveloped technology and that neither
Alexion nor Procter & Gamble guarantees the safety or usefulness of any Product.
Except as otherwise provided in this Agreement, nothing herein shall be
construed as a representation or warranty by either Party to the other that any
Patent or Know-how or other intellectual property right owned or Controlled by
such Party is valid, enforceable, or not infringed by any Third Party, or that
the practice of such rights does not infringe any property right of any Third
Party or that any Patent will issue based upon a pending patent application or
that any such patent which issues will be valid.

      11.5. Negative Covenants. Each Party hereby covenants to the other that
such Party shall not use or practice the other Party's Patents or Know-how in
any field or in any manner except as specifically licensed under this Agreement.

                    Article XII - Indemnification; Insurance

      12.1. Indemnification.

            (a) Research and Development Indemnification. Each party (the
"Indemnifying Party") shall indemnify, defend and hold the other Party (the
"Indemnified Party") harmless from


                                       42
<PAGE>

and against any and all liabilities, claims, damages, costs, expenses or money
judgments incurred by or rendered against the Indemnified Party and its
sublicensees incurred in the defense or settlement of a Third Party lawsuit or
in a satisfaction of a Third Party judgment arising out of any injuries to
person and/or damage to property resulting from (i) the gross negligence or
willful or intentional misconduct in the performance by it of its
responsibilities under the Research & Development Plan or otherwise under this
Agreement, or (ii) personal injury to the Indemnified Party employees or agents
or damage to the Indemnified Party's tangible property resulting from acts
performed by, under the direction of, or at the request of the Indemnifying
Party in carrying out activities contemplated by this Agreement. Notwithstanding
the above, each Party shall indemnify and hold the other Party harmless from and
against that portion of any and all Losses due to the gross negligence or
willful or intentional misconduct of such Indemnifying Party. Further, Procter &
Gamble shall not indemnify, defend or hold harmless Alexion for any claims or
liabilities arising from the actions or inactions of Alexion prior to the date
of this Agreement.

            (b) Indemnification for Marketing. With respect to Products
commercialized by Procter &Gamble under this Agreement, Procter & Gamble hereby
agrees to save, defend, indemnify, and hold harmless Alexion, its agents and
employees, and the principal investigator of the Licensed Technology and all
licensors thereof, their officers, directors, trustees, employees and agents and
all of their heirs, executors, administrators and legal representatives
("Indemnified Parties") from and against any and all such claims, actions,
demands, loss, liability, expense or damage (including investigative costs,
court costs and attorneys' fees) the Indemnified Parties may suffer, pay or
incur as a result of claims, demands or actions against any of the Indemnified
Parties to the extent arising or alleged to arise by reason of or in connection
with any and all personal injury, economic loss and property damage caused or
alleged to be caused or contributed to in whole or in part by the manufacture,
use, handling, storage, sale, sublicense or other disposition of Products by
Procter & Gamble, its Affiliates, agents or sublicensees, whether asserted under
a tort or contractual theory or any other legal theory, including but not
limited to any and all claims, demands, and actions in which it is alleged that
(1) an Indemnified Party's negligence or representations about the Products
caused any defect in their manufacture, design, labeling or performance or (2)
subject to in the case of patents and in


                                       43
<PAGE>

respect to Alexion pursuant to Section 9.7, any alleged infringement of any
patent, trademark or copyright, causes or contributed in whole or in part to the
personal injury, economic loss of property damage.

            (c) Affiliates; Sublicensees. Procter & Gamble shall be responsible
for and indemnify and hold Alexion and its licensors harmless from and against
all acts and omissions of its Affiliates and sublicensees, as if performed or
failed to be performed by it under this Agreement.

            (d) Procedure. Subject to Section 9.7, in the event that an
Indemnified Party is seeking indemnification under Section 12.1(a), 12.1(b) or
12.1(c), it shall inform the Indemnifying Party of a claim as soon as reasonably
practicable after it received notice of the claim, shall permit the Indemnifying
Party to assume direction and control of the defense of the claim (including the
right to settle the claim solely for monetary consideration), and shall
cooperate as requested (at the expense of the Indemnifying Party) in the defense
of the claim.

      12.2. Insurance.

            (a) Without limiting Procter & Gamble's indemnity obligations
under Section 12.1. Procter & Gamble shall obtain or have obtained for it and
it shall maintain or have maintained for it throughout the term of this
Agreement and for at least ten (10) years after its termination or expiration
(i) general liability insurance in comprehensive form with a combined single
limit of no less than $10,000,000, which shall cover at least bodily injury,
personal injury, liability, property damage and product liability claims with
respect to any technology licensed to it hereunder, Patents, or Product
practiced, used, manufactured or sold pursuant to any development, testing
and commercialization of technology, Patents, or Product, and (ii)
contractual insurance in broad form in amounts reasonable and prudent in
light of the risks involved in development, testing and commercialization of
Products. All such policies shall include a contractual endorsement naming
the Indemnified Parties as additional insureds and providing coverage for all
liability which may be incurred by the Indemnified Parties in connection with
this Agreement and require the insurance carrier(s) to provide Alexion with
no less than thirty (30) days written notice of any change in the terms or
coverage of the policy(ies) or its cancellation. In no event, however, shall
Procter & Gamble be obligated to maintain any


                                       44
<PAGE>

insurance in respect of Products manufactured or sold by Alexion.

            (b) Notwithstanding the provisions of Section 12.2(a), if and so
long as Procter & Gamble shall have a consolidated net worth of at least
$1.0 billion, then the insurance coverage may be substituted by self-insurance
provisions as such net worth and self-insurance shall be certified by a
responsible corporate financial officer of Procter & Gamble. In such event,
Procter & Gamble shall hold Alexion, its agents and employees, the principal
investigators of the Licensed Technology and all licensors thereof, their
officers, directors, employees and agents and all of their heirs, executors,
administrators and legal representatives harmless from and against claims from
Third Parties and other liabilities in a manner and measure equivalent to the
insurance coverage otherwise required by this Section 12.2.

            (c) Alexion has obtained insurance coverage customary for a company
of its size, engaged in the research and development of pharmaceutical products.

               Article XIII - Term, Termination: Change of Control

      13.1. Effective Date and Term.

            (a) Effective Date. Within three (3) days of the date first written
above, the Parties shall file the appropriate documents with the U.S. Federal
Trade Commission and the U.S. Department of Justice pursuant to the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and including
such Act's enabling regulations (collectively "HSR"). This Agreement shall
become effective upon such date that the applicable HSR waiting period has
expired or is otherwise terminated ("Effective Date").

            (b) Term. Unless terminated earlier by the Parties pursuant to
Sections 13.2 or 13.3, this Agreement shall commence on the Effective Date and
expire on the later of (i) the date of the last to expire Alexion Patent or
Joint Patent having a Valid Claim or (ii) the date when royalty payments are no
longer payable pursuant to Section 8.2(a). Upon expiration of this Agreement in
accordance with clause (i) or (ii) of this Section, each Party shall grant to
the other Party a non-exclusive worldwide license to use its Know-how, within
the Field; provided, that Procter & Gamble shall continue to be responsible for
milestone payments in accordance with


                                       45
<PAGE>

Sections 8.1 and 8.2(b) of this Agreement as if this Agreement shall not have so
expired.

      13.2. Termination by Procter & Gamble.

            (a) Failure to Meet Success Criteria. Procter & Gamble may terminate
the Agreement upon six (6) months prior written notice to Alexion if at any
time, in the reasonable judgment of the Research & Development Steering
Committee while in effect and thereafter in the reasonable judgment of Procter &
Gamble, the licensed technology or the Product fails to meet Success Criteria,
to be effective at any time at least two (2) years after the Effective Date.


             (b) Collapse of Working Hypothesis. If, within two (2) years
after the Effective Date, Procter & Gamble shall reasonably determine, that
the working hypothesis or scientific rationale underlying the Collaboration
has collapsed and is no longer scientifically viable, then, unless Alexion
shall agree in writing, Procter & Gamble shall be entitled to have such
matter determined by peer review consensus. In such event, the Parties shall
promptly submit such matter for determination by peer review consensus
conducted by three scientists having expertise in the Field, one selected by
Alexion, another by Procter & Gamble and the third by the two scientists so
selected by the Parties. If Alexion shall have so agreed in writing or if
such peer review consensus shall reasonably determine that the working
hypothesis or scientific rationale underlying the Collaboration has collapsed
and is no longer scientifically viable, then Procter & Gamble may terminate
this Agreement by written notice to Alexion. Such notice shall be effective
to terminate the obligations of Procter & Gamble under this Agreement upon
receipt thereof by Alexion, except that, in order to provide for the orderly
transition of responsibilities from Procter & Gamble to Alexion, the
following obligations shall continue and the following shall occur: (i) the
obligations and responsibilities of Procter & Gamble to fund FTEs at the
level then in existence prior to such notice and make other payments
contemplated by Section 4.2 shall continue until expiration of six (6) months
after Alexion's receipt of such written notice of termination (subject to the
reduction of such FTEs by Alexion in accordance with the orderly wind down by
Alexion of such program), (ii) Procter & Gamble shall continue to be
responsible for care and monitoring of clinical patients and other patients
which have been dosed and (iii) Procter & Gamble shall assist Alexion in
winding down any trials in progress in accordance with applicable industry
standards and applicable governmental regulations.


                                       46
<PAGE>

      13.3. Material Breach. Failure by either Party (the "Breaching Party") to
comply with any of the material obligations contained in this Agreement shall
entitle the other Party (the "Non-breaching Party") to give to the Breach Party
notice specifying the nature of the breach and requiring it to cure such breach.

            (a) If such breach involves the payment of money and is not cured or
otherwise resolved by the Parties in writing within fifteen (15) days after
receipt by the Breaching Party of such notice, either Party shall be entitled to
initiate an audit under Section 8.8. In the event of such an audit, if the
Auditor shall render an award of monetary damages payable to the Non-Breaching
Party, and such amount shall remain unpaid for ten (10) days after the Breaching
Party receives a copy of such judgment from the Non-breaching Party, the
Non-breaching Party shall be entitled to terminate this Agreement.

            (b) If such breach does not involve the payment of money, and is not
cured or otherwise resolved by the Parties in writing within sixty (60) days
after receipt by the Breaching Party of such notice, either Party shall be
entitled to initiate arbitration under Section 14.4 and at its sole discretion
suspend performance under this Agreement. If such breach is not cured or
otherwise resolved by the Parties in writing within such sixty (60) day period,
and neither Party initiates an arbitration, all licenses and other rights of the
Breaching Party under Patents and Know-how of the Non-breaching Party and all
rights thereunder shall terminate and revert to the Non-breaching Party.

            (i) If the arbitrators find a material breach of this Agreement,
      then the Breaching Party may pay to the Non-breaching Party an amount
      equal to the amount of damages awarded by the arbitrators plus
      one hundred percent (100%) of such award. If the Breaching Party
      makes such a payment then the provisions of this Agreement shall
      continue in full force and effect. If the Breaching Party does not
      make such payment as provided in Section 13 .2(iii) below, this
      Agreement shall terminate and the Breaching Party shall pay to
      the Non-breaching Party the amount of damages awarded by the
      arbitrators.

            (ii) If the arbitrators find a material breach of this Agreement,
      then the


                                       47
<PAGE>

      Breaching Party may offer to pay to the Non-breaching Party, in
      consideration for the Non-breaching Party's election not to terminate
      the Agreement, an amount equal to the amount of damages awarded
      by the arbitrators plus fifty (50%) of such award. If the
      Non-breaching Party accepts such offer, the provisions of this
      Agreement shall continue in full force and effect. If the
      Breaching Party does not make such offer or if the Non-breaching Party
      rejects such offer, this Agreement shall terminate and the
      Breaching Party shall pay to the Non-breaching Party the amount
      of damages awarded by the arbitrators.

            (iii) Any payment required under the terms of Sections 13.3(a) or
      13.3(b) shall be made in USD to the bank designated by the Party to be
      paid hereunder within ten (10) days after the determination of the audit
      contemplated by Section 8.7 or the decision of the arbitrators, as the
      case may be.

            (iv) Notwithstanding anything herein to the contrary, each Party may
      avail itself of the provisions of clause (i) and (ii), collectively, on a
      single occasion only.

      13.4. Bankruptcy. A Party may terminate (the "Terminating Party") this
Agreement upon written notice, at any time after the other party (the "Bankrupt
Party") is (1) dissolved (other than pursuant to a consolidation, amalgamation
or merger); (2) becomes insolvent or is unable to pay its debts or fails or
admits in writing its inability generally to pay its debts as they become due;
(3) makes a general assignment, arrangement or composition with or for the
benefits of its creditors; (4) institutes or has instituted against it a
proceeding seeking a judgment of insolvency or bankruptcy or any other relief
under any bankruptcy or insolvency law or other similar law affecting creditor's
rights, or a petition is presented for its winding-up or liquidation, and, in
the case of any such proceeding or petition instituted or presented against it,
such proceeding or petition (A) results in a judgment of insolvency or
bankruptcy or the entry of an order for relief or the making of an order for its
winding-up or liquidation or (B) is not dismissed, discharged, stayed or
restrained in each case within 30 days of the institution or presentation
thereon (5) has a resolution passed for its winding-up, official management or
liquidation (other than pursuant to a consolidation, amalgamation or merger);
(6) seeks or becomes subject to the appointment of an administrator, provisional
liquidator, conservator, receiver, trustee, custodian


                                       48
<PAGE>

or other similar official for it or for all or substantially all its assets; (7)
has a secured party take possession of all or substantially all of its assets or
has a distress, execution, attachment, sequestration or other legal process
levied, enforced or sued on or against all or substantially all its assets and
such secured party maintains possession, or any such process is not dismissed,
discharged, stayed or restrained, in each case within thirty (30) days
thereafter; (8) causes or is subject to any event with respect to it which,
under the applicable law of any jurisdiction, has an analogous effect to any of
the events specified in clauses (1) to (7) (inclusive); or (9) takes any action
in furtherance of, or indicating its consent to, approval of, or acquiescence
in, any of the foregoing acts.

      13.5. Termination by Mutual Consent. This Agreement may be terminated by
mutual written consent of the Parties and rights hereunder divided as the
Parties agree in writing.

      13.6 Certain Effects of Termination.

            (a) Termination by Procter & Gamble for Scientific Reasons;
Termination by Alexion. Effective upon a termination under Section 13.2 or by
Alexion in accordance with Section 13.3 or 13.7(b), the following shall occur:

                  (i) Procter & Gamble's licenses under the Alexion Patents and
Alexion Know-how shall automatically be deemed to have terminated and all rights
thereunder shall automatically be deemed to have reverted to Alexion; and
Procter & Gamble shall be deemed to have transferred title to Alexion of all raw
data generated from any clinical or nonclinical studies conducted hereunder by
Alexion for Procter & Gamble;

                  (ii) Procter & Gamble shall, at the option of Alexion, either
deliver to Alexion or discontinue to use and, with respect to materials other
than raw data and biologics, destroy, all copies of Alexion Confidential
Information and any other materials provided by Alexion to Procter & Gamble
hereunder in the possession or Control of Procter & Gamble, its Affiliates or
sublicensees, and shall furnish to Alexion an affidavit signed by a corporate
officer or the Associate General Counsel of Procter & Gamble certifying that
such delivery or destruction has been fully effected. Notwithstanding the
foregoing, and provided Procter &


                                       49
<PAGE>

Gamble fulfills its obligations specified in this Agreement with respect to such
materials. Procter & Gamble's Associate General Counsel may continue to retain
solely for archival purposes a single copy of Alexion's Confidential Information
and any other materials provided by Alexion, except that all biologics and
original versions of raw data generated from any clinical or nonclinical studies
conducted hereunder by Alexion for Procter & Gamble shall be transferred to
Alexion.

                  (iii) Procter & Gamble shall be deemed to have granted to
Alexion a fully-paid, exclusive worldwide license with the right to grant
sublicenses, to Procter & Gamble's entire right, title and interest in Joint
Patents, in the Field, which may be necessary for the sale of a Product and to
Procter & Gamble Know-how, to make, have made, use and have used, import and
have imported, offer for sale and sell and have sold Products, including all
inventions, discoveries and improvements to Alexion Patents, Alexion Know-how,
Collaboration Inhibitor and Products to which Procter & Gamble shall then have
any rights;

                  (iv) Procter & Gamble shall be deemed to have granted to
Alexion an exclusive or non-exclusive worldwide license, as Alexion shall
elect with the right to grant sublicenses, to Procter & Gamble Patents, in
the Field, which may be necessary for the sale of Products. The royalty rate
will be negotiated by the Parties upon commercially reasonable terms, and
will fairly reflect whether the license is on an exclusive or non-exclusive
basis. If the Parties are unable to agree on such terms, either Party may
submit such dispute to be settled by arbitration in accordance with Section
14.4.

                  (v) Procter & Gamble shall transfer to the Alexion or its
designee title to and sponsorship of all Health Registrations, approvals and
rights with respect to the Product anywhere in the Territory, and if title to
and sponsorship of any such Health Registrations, approvals or rights is not
transferable, then Procter & Gamble shall use all Commercially Reasonable
Efforts to enable Alexion or its designee to make use of and prosecute such
Health Registrations, approvals or rights;

                  (vi) Procter & Gamble shall, if such termination shall occur
at any time after a trademark shall be used outside of Procter & Gamble for a
Product (in trials, pre-launch or otherwise), transfer to Alexion, or grant a
fully-paid royalty-free exclusive transferable license (with the right to
sublicense) to Alexion for use and control of, all trademarks for the Product
that


                                       50
<PAGE>

are owned by Procter & Gamble anywhere in the Territory; and

                  (vii) Take any other steps which can only be taken by Procter
& Gamble, necessary for Alexion or its designee to be able to market, promote,
distribute, sell and manufacture Products in each country in the Territory
without undue delay; and

                  (viii) Procter & Gamble shall indemnify, defend and hold
Alexion harmless in accordance with Article XII above from the performance by it
of its responsibilities under Section 3.2 prior to the date of termination and
under Section 13.2(b) and this Section 13.6 after such termination.

            (b) Breach by Alexion. If Procter & Gamble shall terminate this
Agreement in accordance with Section 13.3 due to a breach by Alexion, all
licenses and other rights granted by Alexion to Procter & Gamble shall terminate
and revert to Alexion, and Procter & Gamble shall continue to own the raw data
generated from any clinical or nonclinical studies theretofore conducted
hereunder by Alexion for Procter & Gamble. Alexion shall be entitled, at its
option, to purchase such raw data from Procter & Gamble upon terms commercially
reasonable, to be negotiated by the Parties. If the Parties are unable to agree
on such terms, either Party may submit such dispute to be settled by arbitration
in accordance with Section 14.4.

      13.7. Chance of Control. In the event of a Change in Control, as that term
is defined in Section 13.9(a), of either the Parties or their respective
Affiliates that are primarily responsible for undertaking the obligations under
this Agreement (each collectively or individually then referred to as the
"Acquired Company"), then the Party affiliated with the Acquired Company shall
notify the other Party of any such Change in Control as soon as the Change in
Control may publicly be announced. Upon receipt of any such notification, the
other Party or an Affiliate thereof (the "Electing Company") shall have the
unilateral right to give notice to the Acquired Company within thirty (30) days
after its next regularly scheduled board meeting, but in no event longer than
sixty (60) days after receipt of the Acquired Company's notification that, the
Electing Company:

            (a) if the Electing Company shall be Procter & Gamble, Procter &
Gamble may elect as provided in clause (i) or (ii) below:


                                       51
<PAGE>

            (i) Procter & Gamble may elect not to continue any one or more of
      the three activities of Alexion under this Agreement specified below in
      clauses (1), (2) and/or (3) (each an "Alexion Interest"), as follows:

            (1) Research - the research and development collaboration under
      Sections 3.1 and 3.2 of this Agreement, in which case the Research &
      Development Steering Committee shall develop a transition plan for the
      orderly cessation by Alexion of its responsibilities with respect to
      the collaboration under Sections 3.1 and 3.2 of the Agreement
      ("Alexion's Research Interest") within six (6) months of receipt by
      Alexion of such notice to discontinue (including the maintenance of
      patient care, FTE termination, adverse event responsibilities and
      regulatory matters) and upon the expiration of six (6) months after
      such notice from Procter & Gamble, Alexion's Research Interest shall
      terminate and Procter & Gamble shall be entitled to terminate FTE
      funding in accordance with Section 4.2 hereof or

            (2) Co-Promotion - the co-promotion of Products by Alexion under
      Section 7.3 of this Agreement, in which case (x) if Alexion shall not
      have elected in writing to participate in the marketing of Products as
      contemplated by Section 7.3 of this Agreement, Alexion shall cease such
      co-promotion activities within thirty (30) days after such notice,
      without charge, and (y) if Alexion shall have elected in writing to
      participate in the marketing of Products as contemplated by Section 7.3
      of this Agreement, a determination pursuant to Section 13.9(c) will be
      made of the Purchase Price of the co-promotion rights in Alexion under
      Section 7.3 of the Agreement, including any rights it may have with
      respect to a co-promotion agreement with Procter & Gamble with respect
      to Products ("Alexion's Co-Promotion Interest"), and within fifteen
      (15) days following such Purchase Price determination Procter & Gamble
      will make the further election, in writing, either to (a) purchase
      Alexion's Co-Promotion Interest, or (b) rescind its election to
      purchase Alexion's Co-Promotion Interest as aforesaid. If after the date
      the Purchase Price of Alexion's Co-Promotion Interest shall be determined
      as aforesaid, Procter & Gamble shall elect to purchase Alexion's
      Co-Promotion Interest, upon the expiration of six (6) months after
      receipt by Alexion of such written election from Procter & Gamble,
      Alexion's Co-Promotion Interest shall terminate or

            (3) Manufacturing - the commercial manufacturing of Products by
      Alexion under Section 5.1(b) of this Agreement, in which case (x) if
      Alexion shall not have entered into a commercial manufacturing
      agreement with Procter & Gamble for Products as contemplated by Section
      5.1(b) of this Agreement, Alexion shall cease such manufacturing
      activities within thirty (30) days after receipt of such notice,
      without charge, and (y) if Alexion shall have entered into a commercial
      manufacturing agreement with Procter & Gamble as contemplated by
      Section 5.1(b) of the Agreement, a determination pursuant to Section
      13.9(c) will be made of the Purchase Price of the commercial
      manufacturing rights of Alexion under Section 5.1(b) of the Agreement,
      including any rights it may have with respect to a manufacturing
      agreement with Procter & Gamble with respect to Products ("Alexion's
      Manufacturing Interest"), and within fifteen (15) days following such
      Purchase Price determination Procter & Gamble will make the further
      election, in writing, either to (a) purchase Alexion's Manufacturing
      Interest, or (b) rescind its election to purchase Alexion's
      Manufacturing Interest as aforesaid. If after the date the Purchase
      Price of Alexion's Manufacturing Interest shall be determined as
      aforesaid, Procter & Gamble shall elect to purchase Alexion's
      Manufacturing Interest, upon the expiration of six (6) months after
      receipt by Alexion of such written election from Procter & Gamble,
      Alexion's Manufacturing Interest shall terminate.


                                       52
<PAGE>


      The rights set forth above to terminate or discontinue Alexion's Research,
      Co-Promotion and/or Manufacturing Interests under the circumstances set
      forth above shall in no event affect or impair any of the parties rights
      or obligation with respect to Patents and Know-how under this Agreement,
      including without limitation the continuing obligation of Procter & Gamble
      to make milestone, royalty and sublicense payments pursuant to Sections
      8.1, 8.2 and 8.3 hereof, all of which shall survive any such termination
      or discontinuance of Alexion's Research, Co-Promotion and/or Manufacturing
      Interests. The right of Procter & Gamble to terminate such Interests is
      divisible and can be exercised by Procter & Gamble with respect to one or
      more of such Interests.

            (ii) Procter & Gamble may elect to continue any one or more of
      Alexion's Research, Co-Promotion and Manufacturing Interests, in which
      case Procter & Gamble may request in writing that the ultimate parent
      of the entity acquiring control of the Acquired Company agree to commit
      in writing, within twenty (20) days after receipt of such request, to
      continue to perform the specified Alexion Interest or Interests, to
      otherwise agree to be bound by the provisions of this Agreement, and to
      agree to commit in writing to duly and timely pay, perform and
      discharge all of the obligations of the Party affiliated with the
      Acquired Company under this Agreement, including without limitation, all
      of the obligations to be performed by it during the immediately
      succeeding twenty-four months of the then existing Research &
      Development Plan, a copy of which Plan shall accompany any such notice.
      If and to the extent that Procter & Gamble shall fail to elect to
      proceed as provided in clause (i) above, Procter & Gamble shall be
      deemed to have elected to proceed in accordance with this clause (ii).
      If and to the extent the ultimate parent of the acquiring entity
      accepts these conditions, the specified Alexion Research, Co-Promotion
      and Manufacturing Interest or Interests, as the case may be, shall
      continue, and the option of Procter & Gamble to elect to terminate or
      purchase such Alexion Interest or Interests in accordance with clause
      (i) above shall expire, unless Procter & Gamble shall elect to proceed
      in accordance with clause (i) with respect to such Alexion Interest or
      Interests within thirty (30) days prior to the expiration the period of
      one (1) year from the date of the Change of Control or such longer
      period as the Parties shall agree in writing with respect to the
      specified Alexion Interest or Interests (the "Trial Period"). If the
      ultimate parent of the acquiring entity fails to give notice within the
      required period that it will be bound by the provisions of this
      Agreement, Procter & Gamble shall be deemed to have exercised its
      option to terminate the specified Alexion Interest or Interests as of
      the expiration of such twenty (20) day period and to proceed in
      accordance with clause (i) above.


                                       53
<PAGE>


            (b) if the Electing Party shall be Alexion, Alexion may request
      in writing that the ultimate parent of the entity acquiring control of
      the Acquired Company agree to commit in writing, within twenty (20)
      days after receipt of such request, to continue to perform the
      collaboration, to otherwise agree to be bound by the provisions of this
      Agreement, and to agree to commit in writing to duly and timely pay,
      perform and discharge all of the obligations of the Party affiliated
      with the Acquired Company under this Agreement, including without
      limitation, all of the obligations to be performed by it during the
      immediately succeeding twenty-four months of the then existing Research
      & Development Plan, a copy of which Plan shall accompany any such
      notice. If and to the extent the ultimate parent of the acquiring
      entity accepts these conditions, the collaboration shall continue. If
      the ultimate parent of the acquiring entity fails to give notice within
      the required period that it will be bound by the provisions of this
      Agreement as aforesaid, Alexion shall be deemed to have terminated this
      Agreement as of the expiration of such twenty (20) day period.


                                       54

<PAGE>

      13.8. Substantial Stock Accumulation. In the event of a Substantial Stock
Accumulation in either the Procter & Gamble Parent or the Alexion Parent, as
soon as the Party affiliated with the Affected Company has knowledge of the
Substantial Stock Accumulation, it shall give prompt notice to the other Party.
Such notice shall be separate from and in addition to the notice provided for in
Section 13.7 and must be given regardless of whether the Party affiliated with
the Affected Company regards the Substantial Stock Accumulation as being not in
the best interest of the collaboration. From the date on which the Party
affiliated with the Affected Company has notice of the Substantial Stock
Accumulation, the following provisions shall become effective and remain
effective until the Substantial Stock Accumulation is eliminated, unless
otherwise agreed:

            (i) If the Party that is not affiliated with the Affected Company
      reasonably determines in good faith that the person or entity making the
      Substantial Stock Accumulation is a competitor of such Party or its
      Affiliates in the Field with a Competing Product such Party may so inform
      the other Party in writing. Promptly after receipt of such notice, the
      Party affiliated with the Affected Company shall establish a procedure
      whereby no director or executive employee of the Affected Company who was
      not a director or employee of the Affected Company prior to the
      Substantial Stock Accumulation, and who was previously a director or
      employee of the person or entity making the Substantial Stock Accumulation
      (a "Tainted Director or Executive"), shall receive any of the following:
      (x) confidential information of the other Party and its Affiliates; and
      (y) of the collaboration, except that any such Tainted Director or
      Executive confidential scientific Information can be given information as
      to actual and projected sales and profits of the collaboration.

            (ii) If the Party that is not affiliated with the Affected Company
      does not give notice pursuant to this Section 13.8 the Party affiliated
      with the Affected Company shall establish a procedure whereby no Tainted
      Director or Executive shall receive confidential information of the other
      Party and its Affiliates but need not place any restrictions on
      confidential or other information of the collaboration.

            (iii) In the event of a material violation of this Section 13.8, the
      non-breaching Party may, without resort to the dispute resolution
      procedure set forth in


                                       55
<PAGE>

      Section 14.4, bring an immediate court action or enjoin such violation and
      to recover any damages that it may have incurred by reason of such
      violation.

      13.9. Definitions.

            (a) For purposes of this Agreement, a "Change in Control" of a
company shall be deemed to have occurred in the event of (i) a merger,
combination, reorganization or consolidation of the company with or into
another corporation with respect to which less than a majority of the
outstanding voting power of the surviving or consolidated corporation is held
by shareholders of the company immediately prior to such event, (ii) the sale
of all or substantially all of the properties and assets of the company and
its subsidiaries, or (iii) the acquisition by any individual, firm,
corporation, or entity (other than any profit sharing or other employee
benefit plan of the company or any Affiliate, or any employee or group of
employees or former officers an/or directors of the company or its
Affiliates) of beneficial ownership, directly or indirectly, of securities of
the company representing more than forty percent (40%) of the combined voting
power of the company's then outstanding voting securities; provided, however,
that no such event referred to in clause (i) or (iii) above with respect to
Alexion may result in a Change of control of Alexion unless the market
capitalization of the other company involved in the transaction referred to
in the clause (i) or (iii) above, as the case may be, prior to the public
announcement of such transaction, shall be more than five (5) times the
nmarket capitalization of Alexion at such time. Notwithstanding the
foregoing, for purposes of this Section 13.9(a), a Change in Control shall
only be deemed to occur for Procter & Gamble if there is a Change in Control
of The Procter & Gamble Company or Procter & Gamble Pharmaceuticals, Inc.

            (b) A "Substantial Stock Accumulation" of a company shall be deemed
to have occurred in the event of the accumulation by any individual, firm,
corporation, or entity (other than any profit sharing or other employee benefit
plan of the company or any Affiliate, or any employee or group of employees or
former officers an/or directors of the company or its Affiliates) of beneficial
ownership, directly or indirectly, of securities of the company representing
more than forty percent (40%) of the combined voting power of the company's
then outstanding voting securities.


                                       56
<PAGE>

             (c) The "Purchase Price" for purposes of Section 13.7 shall be
determined as follows:

                  (i) Purchase Price refers to such of Alexion's Co-Promotion
and Manufacturing Interests as shall be the subject of an election by Procter
& Gamble to purchase, and shall be equal to the Valuation (as defined herein)
of such Interest to be purchased under this Agreement, determined as follows:
Each Party shall designate an investment banking firm of its choice, and each
investment banking firm will be asked to prepare an appraisal as to the fair
market value of such of Alexion's Co-Promotion and/or Manufacturing Interests
as a going career that would be received in cash from a Third Party if a sale
of such Interest or Interests were made to a Third Party with the consent of
the other Party, taking into account any contractual obligation of either
Party or its Affiliates to refrain from manufacturing or marketing a product
competitive with the products in the Territory for any period, the value of
the information, Patents and Know-how, and other assets being licensed and
the potential market for such Products and Marketed Products in the Territory
(a "Valuation"). For such Valuation, Alexion shall be entitled (1) to add to
its Manufacturing Interest any testing, manufacturing and production assets
used or useful solely or dedicated to manufacture Products and (2) to add
toits Co-Promotion Interest resources used or useful solely or dedicated to
such Co-Promotion Interest, and the fair market value thereof shall be
included within the Valuation. The investment bankers will be asked to submit
their Valuations of Alexion's Interest or Interests within thirty (30) days
after the Purchase Date as defined in Section 13.9(c)(v). In the event of a
Party's failure to obtain an investment banking firm's Valuation within
thirty (30) days after the Purchase Date, the Valuation will be the Valuation
determined by the investment banking firm appointed by the other Party.

            (ii) If the difference between the lower Valuation and the higher
      Valuation is not more than ten percent (10%) of the higher Valuation, or
      if the Valuations are equal, the final Valuation shall be the average of
      the Valuations. If the difference between the two (2) Valuations is
      more than ten percent (10%) of the higher Valuation, the investment
      bankers will select a third investment banking firm from those known as
      major bracket investment banking firms, and that firm shall also prepare
      a Valuation. The third investment banking firm will not have access to
      the Valuations prepared by the


                                       57
<PAGE>

      other investment banking firms. The two (2) Valuations that are the
      closest in value then shall be averaged, and the resulting average shall
      be the final Valuation.

            (iii) The purchase of an Alexion Interest shall thereafter be
      consummated by payment of the Valuation within sixty (60) days after
      receipt of all investment bankers' valuations or such later date upon
      which all necessary regulatory approvals have been obtained and/or
      regulatory waiting periods have expired.

            (iv) Each Party shall bear the expense of obtaining the Valuation of
      the investment bankers selected by such Party, and if a third investment
      banker is selected, the expense of obtaining its Valuation shall be borne
      equally by the Parties.

            (v) Unless otherwise agreed in writing by the Parties, the Valuation
      for an Alexion Interest shall be calculated as of the date of the Electing
      Company's notice that it elects to exercise its option to purchase such
      Alexion Interest or Interests under Section 13.7(a)(i) (such date shall
      be referred to as the "Purchase Date").

            (vi) During the pendency of the option election and valuation
      process, the Parties shall continue to perform their customary activities
      under this Agreement.

      13.10. Surviving Rights. Except as modified in Sections 13.1(b), 13.3 and
13.6 hereof, the obligations and rights of the Parties under Articles VIII, X,
XI, XII and XIII shall survive termination or expiration of this Agreement.

      13.11. Accrued Rights. Surviving Obligations. Termination or expiration of
this Agreement for any reason shall be without prejudice to any rights which
shall have accrued to the benefit of either Party prior to such termination or
expiration, including, without limitation, the payment obligations under Section
4.2 and Article VIII hereof and any and all damages arising from any breach
hereunder. Such termination or expiration shall not relieve either Party from
obligations which are expressly indicated to survive termination or expiration
of the Agreement.


                                       58
<PAGE>

      13.12. Termination Not Sole Remedy. Termination is not the sole remedy
under this Agreement and, whether or not termination is affected, all other
remedies will remain available except as agreed to otherwise herein.

      13.13. Certain Injunctive Relief. Due to the important confidentiality
concerns of the parties, and for other reasons, the parties will be irreparably
damaged in the event that the provisions of Articles X and XIII hereof are not
specifically enforced. In the event of a breach or threatened breach of the
terms, covenants and/or conditions of either such Article by any of the parties
hereto, the other party shall, in addition to any other remedies it may have, be
entitled to a temporary or permanent injunction, without showing any actual
damage, and/or a decree for specific performance, in accordance with the
provisions of such Articles.

                           Article XIV - Miscellaneous

      14.1. Force Majeure. Neither Party shall lose any rights hereunder or be
liable to the other Party for damages or loss on account of failure of
performance by the Defaulting Party if the failure is occasioned by government
action, war, fire, explosion, flood, strike, lockout, embargo, act of God, or
any other similar cause beyond the reasonable control of the Defaulting Party,
provided that the Party claiming force majeure has exerted all reasonable
efforts to avoid or remedy such force majeure and given prompt notice to the
other Party.

      14.2. Notices. Any notices or communications provided for in this
Agreement to be made by either of the Parties to the other shall be in writing,
in English, and shall be made by prepaid air mail with return receipt addressed
to the other at its address set forth above. Any such notice or communication
may also be given by hand or facsimile to the appropriate designation with
confirmation of receipt. Either Party may by like notice specify an address to
which notices and communications shall thereafter be sent. Notices sent by mail
shall be effective upon receipt; notices given by hand shall be effective when
delivered.


                                       59
<PAGE>

      Notices for Alexion shall be sent to:

                   Alexion Pharmaceuticals, Inc.
                   Attn: President
                   25 Science Park
                   New Haven, Connecticut 06511

      With copy to:

                   Golenbock, Eiseman, Assor & Bell
                   Attn: Lawrence M. Bell, Esq.
                   437 Madison Avenue
                   New York, New York 10022

      Notices for Procter & Gamble shall be sent to:

                   Procter & Gamble Pharmaceuticals, Inc.
                   Attn: President
                   10200 Alliance Road
                   Cincinnati, Ohio 45242-4716

      With copy to:

                   Procter & Gamble Pharmaceuticals, Inc.
                   Attn: Associate General Counsel
                   10200 Alliance Road
                   Cincinnati, Ohio 45242-4716

      14.3. Governing Law. This Agreement shall be governed by the laws of the
State of Delaware, as such laws are applied to contracts entered into and to be
performed within such state. Any claim or controversy arising out of or related
to this Agreement or any breach hereof shall be submitted to arbitration
pursuant to Section 14.4. The United Nations Convention on Contracts for the
International Sale of Goods will not apply to this Agreement.

      14.4. Arbitration. Except as otherwise provided in Sections 8.8, 9.3,
9.7(a), 13.11 and 13.13 of this Agreement, disagreements shall be settled by
arbitration in accordance with the


                                       60
<PAGE>

commercial arbitration rules of the American Arbitration Association. However,
nothing contained herein shall prevent the party or parties hereinafter
indicated from pursuing any and all of their rights and remedies in the courts
of any competent jurisdiction, without submitting the same to arbitration or
consenting to the arbitration thereof as it relates to the following:

                  (i) Either Party, in the event of a default or alleged default
by the other Party in the payment of its monetary obligations under Section 4.2
or Article VIII hereof.

                  (ii) Either Party, in the event of the occurrence or alleged
occurrence of an event of a breach or alleged breach by the other of any of the
provisions of Article X or XII hereof.

      The parties further agree that each such disagreement be submitted to a
panel of three (3) impartial arbitrators with each Party selecting one (1)
arbitrator within fifteen (15) days of a request for arbitration and the two (2)
selected arbitrators selecting a third arbitrator who is experienced in the
United States pharmaceutical industry within thirty (30) days after the request.
Any arbitration hereunder shall commence within thirty (30) days after
appointment of the third arbitrator and shall be held in Cincinnati, Ohio, if
such arbitration is requested by Alexion or New Haven, Connecticut, if such
arbitration is requested by Procter & Gamble. Upon reasonable notice and prior
to any hearing, the Parties will allow document discovery and will disclose all
materials relevant to the subject matter of the dispute. The arbitrators shall
make final determinations as to any discovery disputes. The decision of the
arbitrators shall be rendered no later than sixty (60) days after commencement
of arbitration. The costs of arbitration shall be split by the parties unless
the arbitrators decide otherwise. Any judgment or decision rendered by the panel
shall be binding upon the Parties and shall be enforceable by any court of
competent jurisdiction.

      14.5. Non-waiver of Rights. Except as specifically provided for herein,
the waiver from time to time by any of the parties of any of their rights or
their failure to exercise any remedy shall not operate or be construed as a
continuing waiver of same or of any other of such Party's rights or remedies
provided in this Agreement.


                                       61
<PAGE>

      14.6. Severability. If any term, covenant, or condition of this Agreement
or the application thereof to any Party or circumstance shall, to any extent, be
held to be invalid or unenforceable, then (i) the remainder of this Agreement,
or the application of such term, covenant or condition to Parties or
circumstances other than those as to which it is held invalid or unenforceable,
shall not be affected thereby and each term, covenant, or condition of this
Agreement shall be valid and be enforced to the fullest extent permitted by law
and (ii) the Parties hereto covenant and agree to renegotiate any such term,
covenant, or application thereof in good faith in order to provide a reasonably
acceptable alternative to the term, covenant, or condition of this Agreement or
the application thereof that is invalid or unenforceable, and in the event that
the Parties are unable to agree upon a reasonably acceptable alternative, then
the Parties agree that a submission to arbitration shall be made in accordance
with Section 14.4 to establish an alternative to such invalid or unenforceable
term, covenant, or condition of this Agreement or the application thereof, it
being the intent that the basic purposes of this Agreement are to be
effectuated.

      14.7. Entire Agreement. This Agreement sets forth all the covenants,
promises, agreements, warranties, representations, conditions, and
understandings between the Parties hereto in the scope of the Collaboration,
with the exception of any agreements by the Parties executed at an even date
hereof, and supersedes and terminates all prior agreements and understanding
between the parties under this Agreement. No subsequent alteration, amendment,
change, or addition to this Agreement shall be binding upon the Parties hereto
unless reduced to writing and signed by the respective authorized officers of
the Parties.

      14.8. Retained Rights. Nothing in this Agreement shall limit in any
respect the right of either Party to conduct research and development with
respect to and market products outside the Field using such Party's technology
including know-how and Patents.

      14.9. Assignment.

            (a) The Parties recognize that each may perform some of its
obligations hereunder through Affiliates; provided, however, that Procter &
Gamble and Alexion shall


                                       62
<PAGE>

remain responsible and be guarantors of such performance by their Affiliates and
shall cause their Affiliates to comply with the provisions of this Agreement in
connection with such performance.

            (b) Except as provided in Section 14.9(c) below, Procter & Gamble
and Alexion may only assign their rights under this Agreement in any country
of the Territory to a Third Party with written permission of the other Party,
which permission will only be given at its sole discretion.

            (c) Upon a Change of Control of Alexion, Procter & Gamble may
assign all but not less than all of its rights under this Agreement to a
financially responsible Third Party, on the terms and conditions set forth in
this Section 14.9(c). If Procter & Gamble shall intend to assign its rights
under this Agreement, it shall give Alexion written notice thereof, and
Alexion or a parent thereof shall be entitled, for sixty (60) days thereafter
to negotiate a purchase of such rights from Procter & Gamble.

      If the Parties cannot agree within such sixty (60) day period and if
Procter & Gamble shall intend to assign its rights under this Agreement to a
Third Party, it shall give Alexion prior written notice, specifying the
intended assignee, the terms and conditions of such assignment and the
intended closing date. Alexion or a parent thereof shall have the first and
prior right of refusal with respect to the rights and properties to be
assigned, at the same price and upon the same terms and conditions as offered
by the proposed Third Party assignee. Alexion shall have a period of thirty
(30) days from the receipt of such written notice (which shall include a copy
or, to the extent confidential, describe the terms and conditions of such
Third Party offer) within which to accept or reject the same. If Alexion
elects to accept the terms of the Third Party offer, it shall so signify
within such thirty (30) day period by notice to Procter & Gamble. If Alexion
fails to accept such offer, Procter & Gamble shall have the right, during a
period of ninety (90) from the date the last Third Party offer to Alexion
expires, to assign its right under this Agreement to the intended assignee,
at the same price and upon the same terms and conditions as were set forth in
the notice of the proposed Third Party assignee's offer last received by
Alexion as herein provided, in a bona fide transaction. If any of the price
or terms offered to or by such intended assignee shall change to be more
favorable to the assignee, Procter & Gamble shall give Alexion written notice
thereof and Alexion or a parent thereof shall have the right to purchase

                                       63
<PAGE>

such rights and properties on such revised terms. If Alexion or a parent
thereof shall not accept any such revised offer within fifteen (15) days
after receipt of the latest revised offer, Procter & Gamble shall be entitled
to make such assignment to such Third Party on the terms last offered to
Alexion. For such assignment to be effective, such Third Party shall deliver
to Alexion, prior to the effective date of such assignment, a written
confirmation of the agreement of such Third Party to be bound by the
provisions of this Agreement and its commitment to duly and timely pay,
perform and discharge all obligations of Procter & Gamble under this
Agreement, including without limitations, all of the obligations to be
performed by it under the existing Research & Development Plan, a copy of
which Plan shall accompany such written agreement. Such assignee shall not
have the right to further assign this Agreement under this clause (c).

      14.10. Publicity.

            (a) The Parties will jointly prepare and agree upon the public
announcements of the execution of this Agreement. Thereafter, Procter & Gamble
and Alexion will jointly discuss, based on the principles of this Section 14.10,
any press releases and any other public statements (other than those
contemplated by Section 10.3 above) regarding the subject matter of this
Agreement, the research to be conducted under this Agreement or any other aspect
of this Agreement, subject in each case to disclosure otherwise required by law
or regulation. Each Party shall afford the other Party a reasonable opportunity
to review a press release prepared by it.

            (b) In the discussion and agreement of Section 14.10(a), the
principles observed by Procter & Gamble and Alexion will be accuracy, the
requirements for confidentiality under Article X, the advantage a competitor of
Procter & Gamble or Alexion may gain from any statement under Section 14.10(a),
the requirements of disclosure under any securities laws or regulations of the
United States, including those associated with SEC and regulatory filings and
public offerings, the restrictions imposed by the Federal Food, Drug and
Cosmetic Act, and the standards and customs in the pharmaceutical industry for
such disclosures by companies comparable to Procter & Gamble and Alexion.


                                       64
<PAGE>

      14.11. Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one in the same instrument.

                             Article XV - Execution

      15.1. In witness whereof, the Parties have executed this Agreement in
duplicate originals by their proper officers as of the date and year first
written above.

The Procter & Gamble Company

By: /s/ Mark A. Collar                            Form MPM
   --------------------------------                   --------------------------
   Mark A. Collar                                 Finance WCH
   Vice President - Global Pharmaceuticals,              -----------------------
   Procter & Gamble Worldwide                     Execution AFM
                                                           ---------------------


Alexion Pharmaceuticals, Inc.

By: /s/ Leonard Bell
   --------------------------------
   Leonard Bell
   President and Chief Executive
   Officer


                                            65

<PAGE>

                                  Schedule 1.5

                                 Alexion Patents

             Non-Exclusive License from Enzon ("Ladner Patents" etc.)

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
         Title                Country      Application    Priority Date    Application/     Issue Date      Expires
   (of priority app.)                         Date                          Patent No.                    (calculated)
- ------------------------------------------------------------------------------------------------------------------------
<S>                            <C>          <C>             <C>             <C>             <C>             <C>
Single Polypeptide Chain
     Molecules                  US          01/18/89        09/02/86        4,946,778       08/07/90        08/07/07
- ------------------------------------------------------------------------------------------------------------------------
                                 "          04/25/90            "           5,260,203       11/09/93        11/09/10
- ------------------------------------------------------------------------------------------------------------------------
                                 "          04/01/93            "           5,445,030       10/03/95        10/03/12
- ------------------------------------------------------------------------------------------------------------------------
                                 "          06/06/95            "           5,518,889       05/21/96        05/21/13
- ------------------------------------------------------------------------------------------------------------------------
                                 "          06/06/95            "           5,534,621       07/09/96        07/09/13
- ------------------------------------------------------------------------------------------------------------------------
                                PCT         09/02/87            "        PCT/US87/02208
- ------------------------------------------------------------------------------------------------------------------------
                                EPO             "               "            0281604        03/31/93        09/02/06
- ------------------------------------------------------------------------------------------------------------------------
                                AT              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                BE              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                FR              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                DE              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                IT              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                LU              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                NL              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                SE              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                CH              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                GB              "               "               "               "               "
- ------------------------------------------------------------------------------------------------------------------------
                                CA          09/04/87            "             546,164
- ------------------------------------------------------------------------------------------------------------------------
                                JP          09/02/88            "              219589
- ------------------------------------------------------------------------------------------------------------------------
  Computer-Based System
     And Method For
  Determining Possible
   Chemical Structure           US          09/02/86        09/02/86        4,704,692       11/03/87        11/03/04
- ------------------------------------------------------------------------------------------------------------------------
                                 "              "           09/09/88        4,881,175       11/14/89        11/14/06
- ------------------------------------------------------------------------------------------------------------------------
 Linkers for Linked Fusion
      Polypeptides              US          11/20/92        04/07/94        5,856,456       01/05/99        01/05/16
- ------------------------------------------------------------------------------------------------------------------------

</TABLE>


         Non-Exclusive License from Medical Research Council ("Winter Patents")

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------
         Title                Country      Application    Priority Date    Application/     Issue Date      Expires
   (of priority app.)                         Date                          Patent No.                    (calculated)
- ------------------------------------------------------------------------------------------------------------------------
<S>                            <C>          <C>             <C>             <C>             <C>             <C>
   Recombinant DNA
 Products and Methods           GB          03/26/87        03/26/87        GB218863B       05/23/90        03/26/07
- ------------------------------------------------------------------------------------------------------------------------
                                EP              "               "             239400        08/30/94            "
- ------------------------------------------------------------------------------------------------------------------------
                                AT              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                BE              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                FR              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                DE              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                IT              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                LI              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                LU              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                NL              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                SE              "               "
- ------------------------------------------------------------------------------------------------------------------------
                                CH              "               "
- ------------------------------------------------------------------------------------------------------------------------

</TABLE>


                                            66

<PAGE>

Non-Exclusive License from Medical Research Council ("Winter Patents") Cont.
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
        Title               Country        Application       Priority Date        Application/     Issue Date         Expires
 (of priority app.)                           Date                                 Patent No.                       (calculated)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>            <C>               <C>                  <C>              <C>              <C>
 Recombinant DNA
Products And Methods          CA             03/26/87         03/26/87               533071
- ---------------------------------------------------------------------------------------------------------------------------------
                              US             10/25/91                               5,225,539       06/07/93          06/07/10
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                CIP
                                                              03/26/87
                                                                 and
                              US             05/26/95         05/26/95              08/452,462
- ---------------------------------------------------------------------------------------------------------------------------------
                              JP             03/27/87             "                 296890/87       12/24/87          02/26/07
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>


Exclusive License from Oklahoma Medical Research Foundation ("Sims Patent")

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
        Title               Country        Application       Priority Date        Application/     Issue Date         Expires
                                              Date                                 Patent No.                       (calculated)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>            <C>               <C>                  <C>              <C>              <C>
Inhibition Of Complement
  Medical Inflammatory
     Response Using
 Monoclonal Antibodies
Specific For A Component
   Forming The C5b-9
 Complex Which Inhibit
    The Platelet Or
    Endothelial Cell
 Activating Function Of
   The C5b-9 Complex          US             03/08/94         06/12/89              5,635,178       06/03/97          06/03/14
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>


Yale/Alexion Co-Invention--Exclusive License From Yale ("CPB Patent")

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
        Title               Country        Application       Priority Date        Application/     Issue Date         Expires
 (of priority app.)                           Date                                 Patent No.                       (calculated)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>            <C>               <C>                  <C>              <C>              <C>
   Use Of C5-Specific
 Antibodies For Reducing
  Immune And Hemostatic
   Dysfunctions During
Extracorporal Circulation     US             12/21/95         03/23/94              5,853,722       12/29/98          03/23/14
- ---------------------------------------------------------------------------------------------------------------------------------
                             PCT             03/22/95             "               PCT/US95/03614
- ---------------------------------------------------------------------------------------------------------------------------------
                             EPO                "                 "                 95914820.6
- ---------------------------------------------------------------------------------------------------------------------------------
                             DE                 "                 "                      "
- ---------------------------------------------------------------------------------------------------------------------------------
                             ES                 "                 "                      "
- ---------------------------------------------------------------------------------------------------------------------------------
                             FR                 "                 "                      "
- ---------------------------------------------------------------------------------------------------------------------------------
                             GB                 "                 "                      "
- ---------------------------------------------------------------------------------------------------------------------------------
                             NL                 "                 "                      "
- ---------------------------------------------------------------------------------------------------------------------------------
                             CA                 "                 "                  2,186,108
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

                      Alexion Applications ("SG1.1 Applications")

<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------
       Title              Country    Application    Priority Date    Application/Patent
                                         Date                                No.
- ----------------------------------------------------------------------------------------
<S>                       <C>        <C>            <C>              <C>

     Methods and
Compositions for the
   Treatment of                                         (CIP)
Glomerulonephritis and                                 05/02/94
  other Inflammatory                                     and
      Diseases              PCT        05/01/95        05/01/95        PCT/US95/05688
- ----------------------------------------------------------------------------------------
         "                  EPO           "               "              95919041.1
- ----------------------------------------------------------------------------------------
         "                   AT           "               "                  "
- ----------------------------------------------------------------------------------------
                             BE           "               "                  "
- ----------------------------------------------------------------------------------------
                           CH/LI          "               "                  "
- ----------------------------------------------------------------------------------------
                             DE           "               "                  "
- ----------------------------------------------------------------------------------------
                             DK           "               "                  "
- ----------------------------------------------------------------------------------------
                             ES           "               "                  "
- ----------------------------------------------------------------------------------------
                             FR           "               "                  "
- ----------------------------------------------------------------------------------------
                             GB           "               "                  "
- ----------------------------------------------------------------------------------------
                             IE           "               "                  "
- ----------------------------------------------------------------------------------------
                             NL           "               "                  "
- ----------------------------------------------------------------------------------------
                             PT           "               "                  "
- ----------------------------------------------------------------------------------------
                             SE           "               "                  "
- ----------------------------------------------------------------------------------------
                             AU           "               "               24747/95
- ----------------------------------------------------------------------------------------
                             BR        11/01/96           "               P107594-1
- ----------------------------------------------------------------------------------------
                             CA        05/01/95           "               2,189,015
- ----------------------------------------------------------------------------------------
                             JP        11/01/96           "               7-528523
- ----------------------------------------------------------------------------------------
                             KR        11/02/96           "               96-706200
- ----------------------------------------------------------------------------------------
                             MX        11/01/96           "                965330
- ----------------------------------------------------------------------------------------
                                                         (CIP)
        Methods and                                    05/02/94,
  Compositions for the                                 05/01/95,
       Treatment of                                       and
  Inflammatory Diseases      US        06/07/95        06/07/98           08/487,283
- ----------------------------------------------------------------------------------------

</TABLE>
<PAGE>

                                  Schedule 1.25

                               Licensed Technology

    Exclusive License Agreement dated June 19, 1992 between Oklahoma Medical
Research Foundation (OMRF), Yale University and Alexion Pharmaceuticals, Inc.

    License Agreement dated January 10, 1995 between Yale University and
Alexion Pharmaceuticals, Inc.

    Non-exclusive License Agreement dated May 8, 1996 between ENZON, Inc. and
Alexion Pharmaceuticals, Inc. (non-exclusive license).

    License for Winter Patent dated March 27, 1996 between Medical Research
Council (MRC) and Alexion Pharmaceuticals, Inc. (non-exclusive license).



<PAGE>

                                  Schedule 4.1

                       Research & Development Plan Outline

1.  PROPOSED INDICATIONS FOR h5G1.1-scFv

    A.   Reduction in post-operative complications (death, myocardial
         infarction, ventricular dysfunction, stroke) following
         cardiopulmonary bypass surgery (CBP). [Primary Indication]

    B.   Reduction in mortality and non-fatal myocardial infarction when used
         as an adjunct to thrombolytic therapy in patients following an acute
         myocardial infarction (AMI/t-PA). [Secondary Indication]

    C.   Prevention/reduction of acute cardiac ischemic complications (death,
         non-fatal myocardial infarction, urgent intervention by CABG, repeat
         PTCA or stent) in patients at high rick for abrupt closure of a
         coronary vessel. [High risk PTCA (AMI, unstable angina, high risk
         angioplasty defined by ACC/AHA). This indication includes the patients
         in indication #3.]


2.  OUTLINE OF THE RESEARCH & DEVELOPMENT PLAN

    A Grant chart labeled "OUTLINE OF THE RESEARCH & DEVELOPMENT PLAN" is
    provided as an attachment and summarizes the key activities/timing.
    The (i) principles underlying the "OUTLINE OF THE RESEARCH & DEVELOPMENT
    PLAN" and the detailed "RESEARCH & DEVELOPMENT PLAN"; (ii) the
    pharmaceutical development; (iii) the nonclinical development; and (iv)
    the clinical development plan are discussed below.

    (i)  PRINCIPLES

    The principles underlying this "OUTLINE OF THE RESEARCH & DEVELOPMENT
    PLAN" and the detailed "RESEARCH & DEVELOPMENT PLAN" (see below) to be
    developed and approved by the Research & Development Steering Committee
    are as follows:

    - P&G will collaborate with Alexion on the development of the Research &
      Development Plan taking advantage of the knowledge of both Parties.

    - The duration of the clinical development outlined in the attached Grant
      chart is based upon the current expectations of the Parties and the
      current understanding of regulatory requirements for approval of the
      Product for target indications. The Parties will utilize the clinical
      development knowledge generated by Alexion together with knowledge of
      regulatory agency requirements to develop a clinical plan.

    - P&G and Alexion will collaborate in key meetings with thought leaders
      or FDA or other regulatory agencies which are aimed at resolving major
      technical issues with


<PAGE>


     potential to impact the successful development of the PRODUCT, such as
     potential issues relating to the design of the Phase II and Phase III
     program or other clinical studies.

- -    P&G will use bulk drug and clinical supplies provided by Alexion (until
     such time that P&G selects a contract manufacturer consistent with
     recommendations from Alexion) and it is assumed that the QA & QC
     procedures used by Alexion will ensure that this material meets all
     regulatory specifications and GMP standards.

- -    P&G will be responsible for all regulatory interactions, filings,
     approvals and Alexion will transition the IND responsibility to P&GP.
     Alexion will participate in key regulatory interactions as appropriate
     and agreed to by the Research and Development Steering Committee.

- -    Alexion will transition to P&GP all CMC, non clinical and clinical data,
     databases, and reports to assist in the preparation of electronic NDAs.

(ii)   PHARMACEUTICAL DEVELOPMENT

The following specification, testing methods, formulation development, and
stability studies will be agreed to by the Research & Development Steering
Committee and performed by Alexion:

- -    The establishment of GLP/GMP specifications and testing methods for the
     bulk drug, Product and clinical supplies.

- -    The development of process improvements aimed at lowering the
     manufacturing cost of the Product.

- -    The development and conduct of stability studies on the bulk drug and
     clinical supplies.

(iii)  NON CLINICAL DEVELOPMENT (PHARMACOLOGY, TOXICOLOGY, AND ADME)

Alexion will conduct additional non clinical studies needed to support the
clinical program and explore potential utility of the Alexion Technology
for other indications (e.g., stroke).

(iv)   CLINICAL DEVELOPMENT

        (a)  PHASE I STUDIES

        Alexion has completed the following two Phase I studies and final
        clinical study reports are available:


<PAGE>

            -    A study of the safety, pharmacokinetics and immunogenicity of
                 intravenously administered h5G1.1-scFv (C96-002-o1)

            -    A study of h5G1.1-scFv in patients undergoing cardiopulmonary
                 bypass (C96-001-02)

      The following Phase I study is ongoing to evaluate different dosing
      regimens (C98-003). Alexion will complete this ongoing Phase I study and
      prepare a final report.

            -    A study of the safety of h5G1.1-scFv in normal volunteers
                 (C98-003)

      (b)   PHASE II STUDIES

      The current Phase II program has been developed by Alexion and is based
      upon the target indications, available clinical data on h5G1.1-scFv from
      patients and volunteers, and discussions with regulatory agencies.

      The following studies are envisioned for Phase II:

            -    A double-blind, placebo-controlled study of the effect of
                 h5G1.1-scFv on total mortality and adverse cardiovascular
                 ischemic outcomes in patients in patients undergoing
                 cardiopulmonary bypass. (Commenced)

            -    A double-blind placebo-controlled study comparing h5G1.1-scFv
                 with placebo as an adjunct to reperfusion therapy (thrombolytic
                 or PTCA) in patients with an acute Myocardial infarction
                 (C98-006)

      (c)   PHASE III STUDIES

      The current Phase III program has been developed based upon the target
      indications, the expectations of the Parties and the current understanding
      of regulatory agency requirements in North America. The final Phase III
      program will be developed based upon available Phase II clinical data on
      the h5G1.1-scFv, relevant data from agents with similar potential
      indications, discussions with clinical experts and thought leaders, and
      discussions with the FDA and other regulatory agencies.  The following
      studies are envisioned for Phase III:

            -    A double-blind, placebo-controlled, study of the effect of
                 h5G1.1-scFv on total mortality and adverse cardiovascular
                 ischemic outcomes in patients undergoing cardiopulmonary bypass

            -    A double-blind, placebo-controlled study of the effect of
                 h5G1.1-scFv on mortality and non-fatal reinfarction in acute
                 MI patients treated with thrombolytic therapy.



<PAGE>


            -    A double-blind, placebo-controlled study of the effect of
                 h5G1.1-scFv on acute cardiac ischemic complications (death,
                 non-fatal myocardial infarction, urgent intervention by
                 CABG, repeat PTCA or stent) in patients at high risk for
                 abrupt closure of a coronary vessel.

      Alexion and/or P&G will provide oversight of investigator sites
      participating in clinical trials of the Product.

3.    KEY DEVELOPMENT MILESTONES

      Both Alexion and P&G agree that it is important to develop and meet key
      development milestones to ensure that the development is completed in a
      timely fashion consistent with Commercially Reasonable efforts.

      With this in mind, the Research & Development Steering Committee will
      set the following "KEY DEVELOPMENT MILESTONE"

            COMPLETION OF PHASE II CPB
            START OF PHASE II AMI/PTCA
            COMPLETION OF PHASE II AMI/PTCA
            START OF PHASE III CPB
            COMPLETION OF PHASE III CPB
            START OF PHASE III AMI
            COMPLETION OF PHASE III AMI
            START OF PHASE III HIGH RISK ANGIOPLASTY
            COMPLETION OF PHASE III HIGH RISK ANGIOPLASTY

4.    COMMUNICATION BY THE PARTIES

      Both P&G and Alexion agree on the importance of frequent communication
between the parties on progress and key learnings made during the conduct of the
Research & Development Plan. A communication process (meeting frequencies,
principal contacts, etc) will be developed by the Research & Development
Steering Committee).

5.    DEVELOPMENT AND MODIFICATION OF THE RESEARCH & DEVELOPMENT PLAN FOR THE
      PRODUCT

      The Parties will develop a detailed "RESEARCH & DEVELOPMENT PLAN" for the
      PRODUCT. The content of the "RESEARCH & DEVELOPMENT PLAN" will include
      study outlines for all noncliical and clinical studies, details of the
      process development work to be undertaken, development milestones and
      timings.

      As indicated in Section IV, the Research & Development Steering Committee
      has the

<PAGE>

      responsibility to determine the timing for all development milestones and
      to modify this timing as appropriate if delays are encountered, and to
      develop action steps to avoid delays if any of these development
      milestones is judged to be in jeopardy and can be remedied by Commercially
      Reasonable actions.

      The "Research & Development Plan" is a working document developed by the
      Parties and reviewed and approved by the Research & Development Steering
      Committee together with study protocols. A key responsibility of the
      Research & Development Steering Committee is to monitor progress of the
      development against the development milestones, including but not limited
      to the "Key Development Milestones" identified herein, and includes
      monitoring the progress of key development activities, such as
      investigator recruitment and patient enrollment in clinical studies.

6. Research & Development Steering Committee Guidelines

      The Parties expect that the Research & Development Steering Committee will
      have the primary role in managing the relationship and communication
      between the Parties. In that role, the Research & Development Steering
      Committee shall be responsible for managing all aspects of the
      relationship between the Parties, including but not limited to: (a)
      reviewing study protocols and making decisions on any proposed changes to
      the Research & Development Plan; (b) monitoring and assisting progress of
      clinical and non-clinical development consistent with the Research &
      Development Plan timetable; (c) assessing the results of studies; and (d)
      addressing any regulatory strategy and drug supply issues.

      It is the desire of the Parties to reach decisions by consensus of the
      Research & Development Steering Committee members or the co-chairs. The
      Parties agree to work to promote effective communication between the
      Parties and intend to frankly discuss and attempt to resolve in good faith
      any conflicts, disagreements or disputes which may arise in ways which
      will promote the continuing goodwill between the Parties. While the
      Parties have set forth a dispute resolution process (Section 3.5), the
      Research & Development Steering Committee will attempt to resolve issues
      through discussion aimed at building consensus.

<PAGE>

                              CLINICAL DEVELOPMENT

                                     [GRAPH]

<PAGE>

                                 Schedule 4.2(b)

                                 CPI Adjustment

Alexion's FTE rate in Section 4.2(b) and Annual Contribution thresholds in
Section 8.2(a) and Net Sales threshold levels in Section 8.2(c) shall be
adjusted for inflation once each Fiscal Year utilizing the change in U.S.
Consumer Price Index for all Urban Consumers (CPI) as published by the U.S.
Bureau of Labor Standards from the base CPI of January, 1999, to the CPI
published for June of the immediately preceding Fiscal Year.

Example:

Fiscal Year 2000/2001 inflation factor

           Base January, 1999      CPI = 163.5
                   June, 2000           CPI = 168.5

Fiscal Year 2000/2001 inflation factor = 168.5 - 163.5
                                         -------------
                                             163.5
                                                  = .0306
Base FTE rate = $225,000

Fiscal Year 2000/2001 FTE rate
                                   =$225,000 + (225,000 x Inflation Factor) =
                                   = 225,000 + (225,000 x .0306)
                                   = 225,000 + 6,885
                                   =$231,885.

(Example for illustration purposes only)
<PAGE>

                                  Schedule 7.3

                          Co-Promotion Agreement Terms

1.    Alexion may only co-promote Marketed Products in the United States
      pursuant to the terms and conditions of an agreed and executed
      Co-Promotion Agreement meeting the requirements of Section 7.3 of the
      Collaboration Agreement. The Parties shall negotiate such Agreement in
      good faith, as quickly as possible after Alexion exercises its option to
      participate pursuant to Section 7.3.

2.    For any Fiscal Year during the term of such Co-Promotion Agreement
      (such term to continue for the TERM), Alexion may make no less than
      twenty percent (20%) of the total number of Details ( sum of first
      position Details plus second position Details) forecast by Procter &
      Gamble for the promotion of the Marketed Product in the United States
      for such year. The total number of Details will be the sum of all
      Details planned for the Marketed Product. As the term is used herein,
      "Detail" shall mean those activities normally undertaken by a
      pharmaceutical company's sales force through an interactive personal
      visit and discussion by a trained sales force representative with a
      target physician prescriber during which a full presentation is made to
      such health care professional on the Marketed Product and the
      representative is fully equipped with all applicable approved
      promotional materials such that the relevant characteristics of the
      Marketed Product are described by the representative in a fair and
      balanced manner consistent with the requirements of the FDA and of this
      Agreement, and in a manner that is customary in the industry for the
      purpose of promoting a prescription pharmaceutical product. A first
      position Detail refers to a Detail in which the Marketed Product is the
      first pharmaceutical product presented to the target physician
      prescriber during an interactive personal visit, whereas a second
      position Detail would refer to a Detail where the Marketed Product is
      the second pharmaceutical product presented to the target physician
      prescriber during such visit.

3.    Procter & Gamble will determine the total number of Details to be made
      by Alexion's sales force representatives, the percent of such Details
      which are to be made in the first position and second position, the
      target prescribing physician for such Details, the promotional message
      to be delivered and the timing and frequency of Details. Procter &
      Gamble will establish a co-promotion coordination process and procedure
      so that all of Alexion's Detail can be coordinated with details being
      made by Procter & Gamble.

4.    Procter & Gamble shall pay to Alexion an amount equal to the cost
      Procter & Gamble would have incurred if the Details made by Alexion
      where instead made by either dedicated Procter & Gamble field based
      sales personnel or trained contract sales force personnel available to
      Procter & Gamble. For example, if the total number of Details to be
      made by Alexion in a fiscal year were forty thousand (40,000) of which
      twenty thousand (20,000) were first position Details and twenty
      thousand (20,000) second position Details and Alexion performed such
      Details and Procter & Gamble's cost for each first position Detail was
      Fifty Dollars ($50.00) and second position Detail Forty


<PAGE>

      Dollars ($40.00), then P&G would pay Alexion One Million Eight Hundred
      Thousand Dollars ($1.8 million) [(20,000 x $50) + (20,000 x $40)].

5.    Procter & Gamble shall specify the level of training and will train
      Alexion sales personnel through Procter & Gamble's normal sales training
      practices, at Procter & Gable's expense (exclusive of room, board and
      travel expenses of Alexion personnel).

6.    Procter & Gamble shall provide to Alexion at no cost to Alexion the
      promotional sales materials used by Procter & Gamble in
      the promotion of the Marketed Products being co-promoted by Alexion in
      the same proportionate quantities as are available to Procter & Gamble's
      own sales force.

7.    In accordance with Section 7.1, Procter & Gamble with respect to the
      marketing, planning, strategy and Co-Promotion of the Marketed Products.
      Procter & Gamble shall have the sole right and responsibility
      for establishing and modifying the terms and conditions of the sale of
      the Marketed Products, including, without limitation, terms and conditions
      such as the price at which the Marketed Products will be sold, whether the
      Marketed Products shall be subject to rebates and any discounts, and the
      channels of distribution of the Marketed Products.

8.    The Co-Promotion Agreement shall also contain standard provisions found in
      such agreements, including, but not limited to the following:

      A.    Appointment of Alexion to co-promote Marketed Products

      B.    Co-Promotion Services (e.g., requisite Details to target
            prescribers, coordination of sales effort, compliance with laws and
            applicable authorities, etc.)

      C.    Training of Alexion sales force

      D.    Co-promotion payments (e.g., fees, audit rights, penalty for
            underperformance)

      E.    Adverse reaction reporting and other Regulatory matters.

      F.    Returned/recalled Marketed Product

      G.    Term and termination

<PAGE>

                                  Schedule 8.2

                     Annual Contribution Royalty Calculation

For the term of the contract, Procter & Gamble will pay to Alexion a Royalty on
Annual Contribution. Royalties will be paid on a quarterly basis not later than
fifty-five (55) calendar days following the end of each Fiscal Quarter.

Annual Contribution will be calculated in the fourth Fiscal Quarter of a
specific Fiscal Year. Royalty payments for the first three Fiscal Quarter of
a specific Fiscal Year will be based on the minimum royalty rate of [*****]
for actual Net Sales in the respective Fiscal Quarter. The fourth Fiscal
Quarter payment will include the outstanding royalty payment for the fourth
Fiscal Quarter, as well as a reconciliation payment, if royalty payments on
Annual Contribution for the whole Fiscal Year exceed minimum royalty payments
of [*****] of Net Sales for the whole Fiscal Year. The reconciliation payment
will be adjusted to reflect the time value (foregone interest) on the
reconciliation payment for the difference between the minimum royalty
payments and the royalty payments on Annual Contribution of the first three
Fiscal Quarters of a specific Fiscal Year.

Royalties on Annual Contribution will be calculated as follows:



      Royalties on AC = [EQUATION]

where



i        Index for the country in which P&G sells Marketed Products.

n        Total number of countries in which P&G sells Marketed Product.

q        Index for Fiscal Quarters in the specific Fiscal Year.

NS       Net Sales of Marketed Products in country i in the local currency
  qi     of country i in the Fiscal Quarter q in the specific Fiscal Year.

EXR      Average Exchange rate for the local currency of country i in the
   qi    Fiscal Quarter q stated in US dollars per local currency of country
         i.

EXR      Average Exchange rate for the local currency of country i for the
   i     Fiscal Year stated in US dollars per local currency of country i.

COGS     Costs of Good Sold is the US dollar value of Marketed Product
    i    manufactured and other related costs necessary to deliver Marketed
         Product sold in country i to P&G determined distribution centers/
         production facilities. In terms of this contract, it will
         specifically include the costs to purchase bulk (cartons of vials,
         cartons of IV



<PAGE>

      drip bags, etc.) product from the P&G selected source for Marketed
      Product sold in country 1.


      RR    Royalty Rate on Annual Contribution in the specific Fiscal Year
            based on the Annual Contribution threshold schedule and royalty
            rates stated in Section 8.2(a) of the contract. Annual
            Contribution threshold levels will be adjusted once each Fiscal
            Year for inflation by multiplying the individual Annual
            Contribution threshold levels stated in the contract by the
            percentage change in the US CPI for all Urban Consumers as
            published by the U.S. Bureau of Labor Standards for the period
            January, 1999 to June of the immediately preceding Fiscal Year as
            described in Schedule 4.2(b).


The determination of royalty payments for a specific Fiscal Year is demonstrated
in examples on the following pages.

<PAGE>

            ANNUAL CONTRIBUTION ROYALTY CALCULATION - PAYMENT CYCLE
<TABLE>
- --------------------------------------------------------------------------------------------------------------------------
                                                 SPECIFIC FISCAL YEAR
- --------------------------------------------------------------------------------------------------------------------------
         FY Q1                       FY Q1                             FY Q2                           FY Q3
<S>                        <C>                             <C>                             <C>
- --------------------------------------------------------------------------------------------------------------------------
                           Net Sales of the first Fiscal    Payment of Royalties equal to
                             Quarter used to determine      [*****] of actual Net Sales of
                           royalty payments to Alexion.      the first Fiscal Quarter of
                                                              the specific Fiscal Year.
                           --------------------------------------------------------------
                           -----------------------------------------------------------------------------------------------
                                                           Net Sales of the second Fiscal  Payment of Royalties equal to
                                                              Quarter used to determine   [*****] of actual Net Sales of the
                                                            royalty payments to Alexion.     second Fiscal Quarter of the
                                                                                                specific Fiscal Year.
                                                           ----------------------------------------------------------------
                                                           ----------------------------------------------------------------
                                                                                           Net Sales of the third Fiscal
                                                                                              Quarter used to determine
                                                                                            royalty payments to Alexion.
                                                                                           --------------------------------
- ---------------------------------------------------------------
                    SPECIFIC FISCAL YEAR
- ---------------------------------------------------------------
           FY Q4                          FY Q1
<S>                             <C>
- ---------------------------------------------------------------










- -------------------------------
 Payment of Royalties equal to
[*****] of actual Net Sales of
 the third Fiscal Quarter of the
     specific Fiscal Year.
- -------------------------------
- ---------------------------------------------------------------
Net Sales of the fourth Fiscal      Analysis of differences
  Quarter used to determine      between [*****] minimum royalty
 royalty payments to Alexion.     on Net Sales and calculated
                                           royalty on
- --------------------------------      Annual Contribution.
Net Sales of the Fiscal Year    -------------------------------
and actual COGS of the Fiscal   -------------------------------
 Year are used to determine      Payment of Royalties equal to
     Annual Contribution.       [*****] of actual Net Sales of
- -----------------------------    the fourth Fiscal Quarter of
                                 the specific Fiscal Year plus
                                  an additional Reconciliation
                                   payment adjusted for the
                                  value (interest foregone),
                                if royalty payments following
                                 Section 7.2 based on Annual
                                Contribution exceeded royalty
                                 payments based on [*****] of
                               annual Net Sales of the specific
                                         Fiscal Year.
                                ---------------------------------

</TABLE>


<PAGE>

                  ANNUAL CONTRIBUTION ROYALTY CALCULATION - EXAMPLE 1
                        NO RECONCILIATION PAYMENT TO ALEXION

<TABLE>
<CAPTION>
                                                                SPECIFIC FISCAL YEAR
                                                          ----------------------------------                    FISCAL YEAR
                                                         FY Q1     FY Q2     FY Q3     FY Q4     FY Q1         TOTAL/AVERAGE
                                                         -----     -----     -----     -----     -----         -------------
<S>                                     <C>            <C>       <C>       <C>       <C>       <C>            <C>
NET SALES IN (M) LOCAL CURRENCY (LC):
Country A                                  LCA           10,000    15,000    20,000    30,000                       75,000
Country B                                  LCB           50,000    75,000   100,000   150,000                      375,000
Country C                                  LCC           12,500    18,750    25,000    37,500                       83,750

AVERAGE QUARTERLY EXCHANGE RATES (USD/LC):
Country A                                USD/LCA          1.000     1.000     1.000     1.000                        1.000
Country B                                USD/LCB          0.200     0.300     0.400     0.500                        0.393
Country C                                USD/LCC          0.800     0.700     0.600     0.500                        0.607

NET SALES IN (M) USD:
Country A                                  USD           10,000    15,000    20,000    30,000                       75,000
Country B                                  USD           10,000    22,500    40,000    75,000                      147,500
Country C                                  USD           10,000    13,125    15,000    18,750                       56,875
- --------------------------------------------------------------------------------------------------------       -----------
WORLD WIDE TOTAL NET SALES IN (M) USD:                   30,000    50,625    75,000   123,750                      279,375
========================================================================================================       ===========
Minimum Royalty on Net Sales:           [*****]
- --------------------------------------------------------------------------------------------------------       -----------
FISCAL QUARTER ROYALTY PAYMENTS TO ALEXION IN (M) USD:                  [*****]                                    [*****]
- --------------------------------------------------------------------------------------------------------       -----------

COST OF GOODS SOLD IN (M) LC:
Country A                                  LCA           (2,000)   (3,000)   (4,000)   (6,000)                     (15,000)
Country B                                  LCB          (10,000)  (15,000)  (20,000)  (30,000)                     (75,000)
Country C                                  LCC           (2,500)   (3,750)   (5,000)   (7,500)                     (18,750)

COST OF GOODS SOLD IN (M) USD:
Country A                                  USD           (2,000)   (3,000)   (4,000)   (6,000)                     (15,000)
Country B                                  USD           (2,000)   (4,500)   (8,000)  (15,000)                     (29,500)
Country C                                  USD           (2,000)   (2,625)   (3,000)   (3,750)                     (11,375)
- --------------------------------------------------------------------------------------------------------       -----------
WORLD WIDE COGS IN (M) USD:                                                                                        (55,875)
========================================================================================================       ===========

- --------------------------------------------------------------------------------------------------------       -----------
ANNUAL CONTRIBUTION IN (M) USD:                                                                                    223,500
========================================================================================================       ===========
CPI ADJUSTMENT FOR SPECIFIC FISCAL YEAR:         [*****]
                                                  -----

                                                AC IN (M) USD    CPI ADJUSTED ROYALTY SCHEDULE                   CALCULATED
                                         --------------------    -----------------------------     AC FOR FY   ROYALTY PAYMENT
ROYALTY SCHEDULE IN CONTRACT:            RATE    FROM     TO         RATE    FROM     TO           IN (M) USD  ON AC IN (M) USD
                                         ----    ----    ----        ----    ----   ----           ----------  ----------------
                                                                                                    110,000
                                                                                                    110,000
                                                [****]                      [*****]                   3,500         [*****]
                                                                                                          0
                                         ----    ----    -----       ----    ----   -----           -------         ------

                                                                                                                    ======

                                                           RECONCILIATION PAYMENT* TO ALEXION IN (M) USD:    0

                                                          *Reconciliation payment will be paid, if the calculated royalty
                                                           payments based on Annual Contribution (AC) exceed royalty payments
                                                           based on [*****] of actual annual Net Sales for the specific Fiscal
                                                           Year.
</TABLE>

<PAGE>

                  ANNUAL CONTRIBUTION ROYALTY CALCULATION - EXAMPLE 2
                        RECONCILIATION PAYMENT TO ALEXION

<TABLE>
<CAPTION>
                                                                SPECIFIC FISCAL YEAR
                                                          ----------------------------------                    FISCAL YEAR
                                                         FY Q1     FY Q2     FY Q3     FY Q4     FY Q1         TOTAL/AVERAGE
                                                         -----     -----     -----     -----     -----         -------------
<S>                                     <C>            <C>       <C>       <C>       <C>       <C>            <C>
NET SALES IN (M) LOCAL CURRENCY (LC):
Country A                                  LCA           35,000    40,000    45,000    50,000                      110,000
Country B                                  LCB          175,000   200,000   225,000   250,000                      850,000
Country C                                  LCC           43,750    50,000    56,250    62,500                      212,500

AVERAGE QUARTERLY EXCHANGE RATES (USD/LC):
Country A                                USD/LCA          1.000     1.000     1.000     1.000                        1.000
Country B                                USD/LCB          0.200     0.300     0.400     0.500                        0.365
Country C                                USD/LCC          0.800     0.700     0.600     0.500                        0.625

NET SALES IN (M) USD:
Country A                                  USD           35,000    40,000    45,000    50,000                      170,000
Country B                                  USD           35,000    60,000    90,000   125,000                      310,000
Country C                                  USD           35,000    35,000    33,750    31,250                      135,000
- --------------------------------------------------------------------------------------------------------       -----------
WORLD WIDE TOTAL NET SALES IN (M) USD:                  105,000   135,000   168,750   206,250                      615,000
========================================================================================================       ===========
Minimum Royalty on Net Sales:            [*****]
- --------------------------------------------------------------------------------------------------------       -----------
FISCAL QUARTER ROYALTY PAYMENTS TO ALEXION IN (M) USD:                  [*****]                                    [*****]
- --------------------------------------------------------------------------------------------------------       -----------

COST OF GOODS SOLD IN (M) LC:
Country A                                  LCA           (7,000)   (8,000)   (9,000)  (10,000)                     (34,000)
Country B                                  LCB          (35,000)  (40,000)  (45,000)  (50,000)                    (170,000)
Country C                                  LCC           (8,750)  (10,000)  (11,250)  (12,500)                     (42,500)

COST OF GOODS SOLD IN (M) USD:
Country A                                  USD           (7,000)   (8,000)   (9,000)  (10,000)                     (34,000)
Country B                                  USD           (7,000)  (12,000)  (18,000)  (25,000)                     (62,000)
Country C                                  USD           (7,000)   (7,000)   (6,750)   (6,250)                     (27,000)
- --------------------------------------------------------------------------------------------------------       -----------
WORLD WIDE COGS IN (M) USD:                             (21,000)  (27,000)  (33,750)  (41,250)                    (123,000)
========================================================================================================       ===========

- --------------------------------------------------------------------------------------------------------       -----------
ANNUAL CONTRIBUTION IN (M) USD:                                          [*****]                                   [*****]
========================================================================================================       ===========
ROYALTY ON ANNUAL CONTRIBUTION (M) USD:
UNDERPAYMENT IN (M) USD:                                                 [*****]
AVERAGE QUARTERLY INTEREST RATE:            [*****]
ADJUSTED FOR FOREGONE INTEREST (COMPOUNDING):               858     1,071     1,300     1,543                        4,772

CPI ADJUSTMENT FOR SPECIFIC FISCAL YEAR:    [*****]
                                                  ----

                                                AC IN (M) USD    CPI ADJUSTED ROYALTY SCHEDULE                   CALCULATED
                                         --------------------    -----------------------------     AC FOR FY   ROYALTY PAYMENT
ROYALTY SCHEDULE IN CONTRACT:            RATE    FROM     TO         RATE    FROM     TO           IN (M) USD  ON AC IN (M) USD
                                         ----    ----    ----        ----    ----   ----           ----------  ----------------
                                                                                                    110,000
                                                                                                    110,000
                                                [*****]                     [*****]                 272,000         [*****]
                                                                                                          0
                                         ----    ----    -----       ----    ----   -----           -------         ------
                                                                                                                    [*****]
                                                                                                                    ======

                                                             UNDERPAID ROYALTIES* TO ALEXION IN (M) USD:    4,600
                                                                TIME VALUE OF MONEY (FOREGONE INTEREST):      172
                                                           ------------------------------------------------------
                                                           RECONCILIATION PAYMENT TO ALEXION IN (M) USD:    4,772
                                                           ======================================================
                                                          *Reconciliation payment will be paid, if the calculated royalty
                                                           payments based on Annual Contribution (AC) exceed royalty payments
                                                           based on [*****] of actual annual Net Sales for the specific Fiscal
                                                           Year.
</TABLE>

<PAGE>

                                 Schedule 8.2(c)

                     Additional Milestone Payments on Net Sales

Procter & Gamble will make one-time only payments which are triggered on the
first occurrence during the Term where Fiscal Year Net Sales for Products
exceed Net Sales threshold levels specified in 8.2(c) with such Net Sales
threshold levels adjusted by CPI as described in Schedule 4.2(b).

Fiscal Year A       Net Sales = [*****]
                    Additonal Milestone Payment = [*****]

Fiscal Year B       Net Sales = [*****]
                    Additional Milestone Payment = [*****]
                    (First time Fiscal Year Net Sales exceed CPI adjusted
                      [*****] Net Sales threshold level)

Fiscal Year C       Net Sales = [*****]
                    Additional Milestone Payment = [*****]

Fiscal Year D       Net Sales = [*****]
                    Additional Milestone Payment = [*****]
                    (First time Fiscal Year Net Sales exceed CPI adjusted
                      [*****] Net Sales threshold level)



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