ALEXION PHARMACEUTICALS INC
S-3, 1997-12-03
PHARMACEUTICAL PREPARATIONS
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 3, 1997

                                                      REGISTRATION NO. 333-_____

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------

                                    FORM S-3

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                   ----------

                          ALEXION PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)

         DELAWARE                                             13-3648318
(State or other jurisdiction of                            (I.R.S. Employer
 incorporation or organization)                        Identification Number)

                                 25 SCIENCE PARK
                               NEW HAVEN, CT 06511
                                 (203) 776-1790

          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)

                                   ----------

                               LEONARD BELL, M.D.
                          ALEXION PHARMACEUTICALS, INC.
                                 25 SCIENCE PARK
                               NEW HAVEN, CT 06511
                                 (203) 776-1790

            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   ----------

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

                            MERRILL M. KRAINES, ESQ.
                           FULBRIGHT & JAWORSKI L.L.P.
                                666 FIFTH AVENUE
                            NEW YORK, NEW YORK 10103

                                   ----------

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

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

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

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

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

     If delivery of the prospectus is expected to be made pursuant to Rule 434, 
please check the following box. |_|

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
     Title of each class           Amount to be           Proposed maximum           Proposed maximum                 Amount of
        of securities               registered             price per unit        aggregate offering price         registration fee
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                  <C>                     <C>                       <C>                            <C>
  Common Stock, $.0001 par
       value per share               1,062,762               $11.6875(1)               $12,421,031.00                 $3,665.00
====================================================================================================================================
</TABLE>

(1)  The price is estimated in accordance with Rule 457(c) under the Securities
     Act of 1933, as amended, solely for the purpose of calculating the
     registration fee and is $11.6875, the average of the high and low prices of
     Alexion Pharmaceuticals, Inc. Common Shares as reported on The Nasdaq Stock
     Market on November 25, 1997.

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

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

<PAGE>

INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO
REGISTRATION OF QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

                SUBJECT TO COMPLETION -- DATED DECEMBER 3, 1997

                          ALEXION PHARMACEUTICALS, INC.

                                1,062,762 Shares

                                  Common Stock

     This Prospectus relates to the resale of shares of Common Stock, $.0001 par
value per share (the "Common Stock") of Alexion Pharmaceuticals, Inc. (the
"Company" or "Alexion") from time to time for the account of the Selling
Stockholders (the "Selling Stockholders"). Certain of the shares of Common Stock
registered hereby are issuable upon conversion of outstanding shares of the
Company's Series B Convertible Preferred Stock, $.0001 par value per share (the
"Series B Preferred Stock"), owned by one of the Selling Stockholders. Certain
of the shares of Common Stock registered hereby are issuable upon the exercise
of warrants (the "Warrants") owned by certain of the Selling Stockholders. The
Company will not receive any of the proceeds from the sale of the Common Stock
by the Selling Stockholders. The proceeds from the exercise of the Warrants, if
any, will be received by the Company. See "Use of Proceeds."

     Of the 1,062,762 shares of Common Stock offered hereby, 126,980 shares may
be acquired upon the exercise of the Warrants which were issued by the Company
in connection with its December 1993 private placement and 935,782 shares are
issuable upon the conversion of the outstanding shares of Series B Preferred
Stock. The Warrants consist of (i) 21,640 warrants to purchase shares of Common
Stock at a price of $15.00 per share, subject to adjustment in certain
circumstances, exercisable at any time prior to the close of business on
December 4, 1997, which were issued to purchasers in the Private Placements (the
"Placement Warrants") and (ii) 105,340 warrants to purchase shares of Common
Stock at a price of $7.50 per share, subject to adjustment in certain
circumstances, exercisable at any time prior to the close of business on
December 4, 1997, which were issued in exchange for certain of the Placement
Warrants and Placement Agent Warrants (the "Exchange Warrants"). The Series B
Preferred Stock is automatically convertible into 935,782 shares of Common Stock
on March 4, 1998 or at anytime prior thereto at the election of the holder.

     The distribution of the Common Stock by the Selling Stockholders may be
effected from time to time in one or more transactions (which may involve block
transactions) in the over-the-counter market (including the Nasdaq National
Market) or any exchange on which the Common Stock may then be listed, in
negotiated transactions, through the writing of options on shares (whether such
options are listed on an options exchange or otherwise), or a combination of
such methods of sale, at market prices prevailing at the time of sale, at prices
related to such prevailing market prices or at negotiated prices. The Selling
Stockholders may effect such transactions by selling shares to or through
broker-dealers, and such broker-dealers may receive compensation in the form of
underwriting discounts, concessions or commissions from the Selling Stockholders
and/or purchasers of shares for whom they may act as agent (which compensation
may be in excess of customary commissions). The Selling Stockholders may also
sell the shares of Common Stock pursuant to Rule 144 promulgated under the
Securities Act of 1933, as amended (the "Securities Act"), or may pledge shares
as collateral for margin accounts and such shares could be resold pursuant to
the terms of such accounts. The Selling Stockholders and any broker-dealers that
act in connection with the sale of Common Stock might be deemed to be
"underwriters" within the meaning of Section 2(11) of the Securities Act and any
commissions received by them and any profit on the resale of the shares might be
deemed to be underwriting discounts or commissions under the Securities Act. The
Selling Stockholders may agree to indemnify any agent, dealer or broker-dealer
that participates in transactions involving sales of the Common Stock against
certain liabilities, including liabilities arising under the Securities Act.

     The Company's Common Stock trades on the Nasdaq National Market under the
symbol "ALXN." On December 1, 1997, the closing sale price of the Common Stock
was $11.00 per share.

     All expenses of the registration of securities covered by this Prospectus
are to be borne by the Company, except that the Selling Stockholders will pay
underwriting discounts, selling commissions, and fees and the expenses, if any,
of counsel or other advisers to the Selling Stockholders.

                                   ----------

          THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.

                      SEE "RISK FACTORS" LOCATED ON PAGE 6.

                                   ----------

     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED
UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.

                                   ----------


                The date of this Prospectus is December __, 1997

<PAGE>

         No person is authorized in connection with the offering made hereby to
give any information or to make any representation not contained or incorporated
by reference in this Prospectus, and any information or representation not
contained or incorporated herein must not be relied upon as having been
authorized by the Company or the Selling Stockholders. This Prospectus does not
constitute an offer to sell or a solicitation of an offer to buy by any person
in any jurisdiction in which it is unlawful for such person to make such offer
or solicitation. Neither the delivery of this Prospectus at any time nor any
sale made hereunder shall under any circumstance imply that the information
contained herein is correct as of any date subsequent to the date hereof.

                              AVAILABLE INFORMATION

         The Company is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, files reports and other information with the Securities
and Exchange Commission (the "Commission"). Proxy statements, reports and other
information concerning the Company can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549 and the regional offices of the
Commission located at Seven World Trade Center, 13th Floor, New York, New York
10048, and 500 West Madison Street, Chicago, Illinois 60661, and copies of such
material can be obtained from the Public Reference Section of the Commission at
450 Fifth Street, N.W., Washington, D.C. 20549, and its public reference
facilities in New York, New York and Chicago, Illinois, at prescribed rates.
Copies of such information may also be inspected at the reading room of the
library of the National Association of Securities Dealers, Inc., 1735 K Street,
Washington, D.C. 20006. This Prospectus does not contain all of the information
set forth in the Registration Statement of which this Prospectus is a part and
exhibits thereto which the Company has filed with the Commission under the
Securities Act of 1933 as amended (the "Securities Act") and to which reference
is hereby made. The Commission maintains a World Wide Web site on the Internet
at http://www.sec.gov that contains reports, proxy and information statements
and other information regarding the Company and other registrants that file
electronically with the Commission.

         This Prospectus constitutes a part of a Registration Statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") filed by the Company with the Commission under the
Securities Act. This Prospectus does not contain all of the information set
forth in the Registration Statement, certain parts of which are omitted in
accordance with the rules and regulations of the Commission. For further
information with respect to the Company and the Common Stock, reference is
hereby made to the Registration Statement. Statements contained herein
concerning the provisions of any contract, agreement or other document are not
necessarily complete, and in each instance reference is made to the copy of such
contract, agreement or other document filed as an exhibit to the Registration
Statement or otherwise filed with the Commission. Each such statement is
qualified in its entirety by such reference. Copies of the Registration
Statement together with exhibits may be inspected at the offices of the
Commission as indicated above without charge and copies thereof may be obtained
therefrom upon payment of a prescribed fee.

         PRIVATE SECURITIES LITIGATION REFORM ACT SAFE HARBOR STATEMENT

         This Prospectus (including the documents incorporated by reference
herein) contains certain forward-looking statements (as such term is defined in
the Private Securities Litigation Reform Act of 1995) and information relating
to Alexion that are based on the beliefs of the management of Alexion, as well
as assumptions made by and information currently available to the management of
Alexion. When used in this Prospectus, the words "estimate," "project,"
"believe," "anticipate," "intend," "expect" and similar expressions are intended
to identify forward-looking statements. Such statements reflect the current
views of Alexion with respect to future events and are subject to risks and
uncertainties that could cause actual results to differ materially from those
contemplated in such forward-looking statements. For a discussion of such risks,
see "Risk Factors." Readers are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date hereof. Alexion does
not undertake any obligation to publicly release any revisions to these forward
looking statements to reflect events or circumstances after the date hereof or
to reflect the occurrence of unanticipated events.

                                   ----------


                                       2
<PAGE>

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following documents filed by Alexion Pharmaceuticals, Inc. are
incorporated herein by reference and made a part hereof:

         1. The Company's Annual Report on Form 10-K for the fiscal year ended
July 31, 1997, as amended by Form 10-K/A, dated November 14, 1997.

         In addition to the foregoing, all documents subsequently filed by the
Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities
Exchange Act of 1934, prior to the filing of a post-effective amendment
indicating that all of the securities offered hereunder have been sold or
deregistering all securities then remaining unsold, shall be deemed to be
incorporated by reference in this Registration Statement and to be part hereof
from the date of filing of such documents. Any statement contained in a document
incorporated by reference in this Registration Statement shall be deemed to be
modified or superseded for purposes of this Registration Statement to the extent
that a statement contained herein or in any subsequently filed document that is
also incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Registration Statement.

         This Prospectus incorporates documents by reference which are not
presented herein or delivered herewith. These documents are available upon
request from: Alexion Pharmaceuticals, Inc., 25 Science Park, New Haven, CT
06511, Attention: David W. Keiser, Executive Vice President and Chief Operating
Officer, (203) 776-1790. The Company undertakes to provide without charge to
each person to whom this Prospectus is delivered, upon written or oral request
of such person, a copy of any or all of the foregoing documents incorporated by
reference herein, other than exhibits to such documents, unless such exhibits
are specifically incorporated by reference into such documents.


                                       3
<PAGE>

                               PROSPECTUS SUMMARY

         The following summary is qualified in its entirety by the more detailed
information and financial data appearing elsewhere or incorporated by reference
in this Prospectus. Investors should carefully consider the information set
forth under the heading "Risk Factors."

         This Prospectus contains forward-looking statements which involve risks
and uncertainties. The Company's actual results could differ materially from
those anticipated in these forward-looking statements as a result of certain
factors, including those set forth under "Risk Factors" and elsewhere in, or
incorporated by reference in, this Prospectus.

                                   THE COMPANY

         Alexion Pharmaceuticals, Inc. ("Alexion" or the "Company") is a
biopharmaceutical company engaged in research and the development of proprietary
immunoregulatory compounds for the treatment of autoimmune and cardiovascular
diseases. The Company is developing C5 complement inhibitors ("C5 Inhibitors")
and Apogens ("Apogens"), two classes of potential therapeutic compounds designed
to selectively target specific disease-causing segments of the immune system.
The Company believes that its C5 Inhibitors and Apogens, which are based upon
distinct immunoregulatory technologies, may have the advantage of achieving a
higher level of efficacy with the potential for reduced side effects when
compared to existing therapeutic approaches. In recent Phase I/II and Phase IIa
clinical trials involving 35 cardiopulmonary patients, Alexion's lead C5
Inhibitor, 5G1.1-SC, has been demonstrated to significantly block complement
activation and provide a substantial anti-inflammatory effect. The Company
expects to file two Investigational New Drug ("IND") applications for its second
C5 Inhibitor, 5G1.1, near the end of 1997 so as to commence clinical studies in
rheumatoid arthritis and lupus patients. The Company's lead Apogen product
candidate, MP4, for the treatment of multiple sclerosis is expected to enter
clinical trials in the first half of 1998. The Company will need to undertake
and complete further tests in order to confirm its belief regarding the safety
and efficacy of its product candidates, and there can be no assurance as to the
results of any such tests, or that such tests will commence on the expected
date.

         As an outgrowth of its core immunoregulatory technologies, the Company
is developing immunoprotected materials for transplantation and gene therapy. In
collaboration with United States Surgical Corporation ("US Surgical"), Alexion
is developing non-human cell and organ UniGraft products which are designed for
transplantation into humans. Further, in a collaboration with Genetic Therapy
Inc., a subsidiary of Novartis ("GTI/Novartis"), which was initiated in December
1996, Alexion is developing immunoprotected gene transfer systems which are
designed to enable the injectable delivery of therapeutic genes to patients'
cells. See "Recent Developments" below.

         The Human Immune System. The role of the human immune system is to
defend the body from attack or invasion by infectious agents or pathogens. This
is accomplished through a complex system of proteins and cells, primarily
complement proteins, antibodies and various types of white blood cells, each
with a specialized function. Under normal circumstances, complement proteins,
together with antibodies and white blood cells, act beneficially to protect the
body by removing pathogenic microorganisms, cells containing antigens (foreign
proteins), and disease-causing immune complexes (combinations of antigens and
antibodies). However, any number of stimuli, including antibodies, pathogenic
microorganisms, injured tissue, normal tissue, proteases (inflammatory enzymes)
and artificial surfaces can locally activate complement proteins in a cascade of
enzymatic and biochemical reactions (the "complement cascade") to form
inflammatory byproducts leading, for example, in the case of rheumatoid
arthritis, to severe joint inflammation and, in the case of cardiovascular
disorders such as myocardial infarction (death of heart tissue), to additional
significant damage to the heart tissue. T-cells, a type of white blood cell,
play a critical role in the normal immune response by recognizing cells
containing antigens, initiating the immune response, attacking the
antigen-containing tissue and directing the production of antibodies directed at
the antigens, all of which lead to the elimination of the antigen-bearing
foreign organism. When a T-cell mistakenly attacks host tissue, the T-cell may
cause an inflammatory response resulting in tissue destruction and severe
autoimmune disease leading, for example, in the case of multiple sclerosis, to
severe and crippling destruction of nerve fibers in the brain.


                                       4
<PAGE>

         C5 Inhibitors. Alexion is developing specific and potent
biopharmaceutical C5 Inhibitors which are designed to intervene in the
complement cascade at what the Company believes to be the optimal point so that
the disease-causing actions of complement proteins generally are inhibited while
the normal disease-preventing functions of complement proteins generally remain
intact. In laboratory and animal models of human disease, Alexion has shown that
C5 Inhibitors are effective in substantially preventing inflammation during
cardiopulmonary bypass ("CPB"), limiting myocardial infarction during coronary
ischemia and reperfusion, enhancing survival in lupus and preserving kidney
function in nephritis (kidney inflammation) and reducing the incidence and
severity of inflammation and joint damage in rheumatoid arthritis. The Company
is developing two C5 Inhibitors, a short acting humanized (compatible for human
use) single chain antibody (5G1.1-SC) designed for acute therapeutic settings
such as in CPB procedures and in treating myocardial infarctions, and a long
acting humanized monoclonal antibody (5G1.1) designed for treating chronic
disorders such as nephritis and rheumatoid arthritis. In addition to studies in
normal volunteers, 5G1.1-SC has been recently studied in 35 patients undergoing
CPB in Phase I/II and Phase IIa clinical trials. In these studies, 5G1.1-SC
administration reduced an increase of over 1000% in complement activation
observed in patients treated with placebo in a dose-dependent manner such that
there was no detectable increase in complement at the higher doses. In the same
studies, 5G1.1-SC reduced the peak white blood cell activation observed in CPB
patients treated with placebo by more than 60%. The Company's long acting
monoclonal antibody has completed manufacturing and the Company expects to file
two INDs near the end of 1997 so as to commence clinical studies in rheumatoid
arthritis and lupus.

         Apogens. The Company's Apogen compounds are based upon discoveries at
the National Institutes of Health ("NIH") which are exclusively licensed to
Alexion and upon further discoveries by Alexion. These discoveries involve a
mechanism by which substantially all disease-causing T-cells are selectively
eliminated in vivo in animal models of disease. The highly specific recombinant
Apogens under development by the Company are designed to selectively eliminate
disease-causing T-cells in patients with certain autoimmune diseases including
multiple sclerosis and diabetes mellitus. The Company has demonstrated that its
lead proprietary Apogen, MP4 ("MP4"), is effective at preventing neurologic
disease and in ameliorating established disease in animal models of multiple
sclerosis. Clinical trial quantities of MP4 are currently in production and the
Company anticipates it will file an IND for the multiple sclerosis indication in
the first half of 1998.

         UniGraft Program. The Company's UniGraft program, in collaboration with
US Surgical, is focused on developing non-human cell and organ products designed
for transplantation into humans without clinical rejection. Alexion has tested
genetically engineered pig hearts, livers and lungs in primates and has
demonstrated transplant organ function substantially longer than for
transplanted non- genetically engineered porcine organs.

         Gene Transfer Systems. Alexion is developing, in collaboration with
GTI/Novartis, immunoprotected retroviral vector particles and producer cells
which are designed to resist rejection and therefore may be able to be used for
direct injectable delivery of therapeutic genes to patients' cells. Such
particles and producer cells are being engineered by Alexion for subsequent
preclinical evaluation by GTI.

         The Company was founded in New Haven, Connecticut in January 1992 with
scientific founders largely drawn from the faculty of Yale University. The
Company's principal executive offices are at 25 Science Park, New Haven,
Connecticut 06511, and its telephone number is (203) 776-1790.


                                  THE OFFERING

  Common Stock offered by the Selling Stockholders....  1,062,762 shares (1)

  NASDAQ symbol.......................................  ALXN

  Risk factors........................................  See "Risk Factors" for a
                                                        discussion of certain 
                                                        factors to be considered
                                                        by prospective 
                                                        investors.

- --------

(1)  Includes 126,980 shares of Common Stock issuable upon the exercise of the
     Warrants and 935,782 shares of Common Stock issuable upon conversion of the
     Series B Preferred Stock.


                                       5
<PAGE>

                                  RISK FACTORS

         An investment in the Common Stock offered hereby involves a high degree
of risk. Prospective investors should consider carefully the following risk
factors, as well as the other information set forth in this Prospectus, in
connection with an investment in the Common Stock offered hereby. This
Prospectus contains forward-looking statements that involve risks and
uncertainties. The Company's actual results could differ materially from the
results discussed in the forward-looking statements. Factors that could cause or
contribute to such differences include, but are not limited to, those discussed
in "Risk Factors," as well as those discussed elsewhere in this Prospectus.

         Operating Losses; Uncertainty of Future Profitability. Alexion has
generated no revenues from product sales and is dependent upon its research and
development contracts, including the agreements with US Surgical and
GTI/Novartis, external financing, other research and development contracts and
research and development grants to the extent that they can be obtained and
interest income to pursue its intended business activities. The Company has
incurred losses since inception and has cumulative net losses of $31.8 million
through July 31, 1997. Losses have resulted principally from costs incurred in
research activities aimed at identifying and developing the Company's product
candidates and from general and administrative costs. The Company expects to
incur substantial additional operating losses over the next several years and
expects losses to increase as the Company's research and development efforts
expand and clinical trials continue and potentially expand. The Company's
ability to achieve profitability is dependent on its ability to obtain patent
protection and regulatory approval for its products, to obtain licenses from
third parties to use technology which it may need, to enter into agreements for
product development and commercialization with corporate partners and to develop
the capacity to manufacture and sell products. There can be no assurance that
the Company will successfully develop, commercialize, manufacture or market any
of its potential products, obtain required regulatory approvals, patents or
third party licenses to technology or ever achieve profitability.

         Early Stage of Product Development; Risks of Clinical Trials. The
Company's research and development programs are at an early stage. There can be
no assurance that the Company's drug discovery efforts will result in the timely
commencement of clinical studies or the development of commercially successful
therapeutic drugs. Potential products which have been identified will require
significant additional development, preclinical and clinical testing, regulatory
approval, and additional investment prior to their commercialization, which may
never be achieved. Potential products may be found to be ineffective or cause
harmful side effects during preclinical testing or clinical trials, fail to
receive necessary regulatory approvals, be difficult to manufacture on a large
scale, fail to achieve market acceptance, be uneconomical or be precluded from
commercialization by proprietary rights of third parties. The results from
preclinical studies and early clinical trials may not be predictive of results
that will be obtained in large-scale clinical trials and do not necessarily
predict or prove safety or efficacy in humans.

         In addition, the Company is conducting clinical trials of one of its
product candidates. There can be no assurance that clinical trials of the
Company's product candidates will demonstrate sufficient safety and efficacy to
obtain the requisite regulatory approvals or will result in marketable products.
Clinical trials are often conducted with patients that are critically ill.
During the course of treatment, these patients can die or suffer other adverse
medical effects for reasons that may not be related to the pharmaceutical agent
being tested but which can nevertheless affect clinical trial results. A number
of companies in the pharmaceutical industry have suffered significant setbacks
in advanced clinical trials, even after promising results in earlier trials. Any
such setback could have a material adverse effect on the Company's business,
financial condition and results of operations. The completion of clinical trials
of the Company's product candidates may be delayed by many factors and there can
be no assurance that delays or terminations will not occur. One such factor is
the rate of enrollment of patients, which generally varies throughout the course
of a clinical trial and which depends on the size of the patient population, the
number of clinical trial sites, the proximity of patients to clinical trial
sites, the eligibility criteria for the trial and the existence of competing
clinical trials. The Company cannot control the rate at which patients present
themselves for enrollment, and there can be no assurance that the rate of
patient enrollment will be consistent with the Company's expectations or be
sufficient to enable clinical


                                       6
<PAGE>

trials of the Company's product candidates to be completed in a timely manner.
Further, there can be no assurance that materials for clinical trials will be
produced in a timely manner, if at all.

         Need for Additional Funds. The Company will require substantial
additional funds for its research and product development programs, for
operating expenses, for pursuing regulatory approval and for developing required
production, sales and marketing capabilities. With the exception of the
Company's agreements with US Surgical and GTI/Novartis and certain research
grants, the Company does not have any commitments or arrangements to obtain any
such funds and there can be no assurance that funds for these purposes, whether
through additional sales of securities or collaborative or other arrangements
with corporate partners or from other sources, will be available to the Company
when needed or on terms favorable to the Company. The unavailability of
additional financing could require the Company to delay, scale back or eliminate
certain of its research and product development programs or to license third
parties to commercialize products or technologies that the Company would
otherwise undertake itself, any of which would have a material adverse effect on
the Company. The Company believes that its existing available resources,
together with anticipated future funding from US Surgical and GTI/Novartis and
certain research grants, and interest income should be sufficient to fund its
operating expenses and capital requirements as currently planned for at least 18
months. However, the Company's cash requirements may vary materially from those
now planned because of results of research and development, results of product
testing, relationships with strategic partners, changes in the focus and
direction of the Company's research and development programs, competitive and
technological factors, developments in the regulatory process and other factors,
none of which can be predicted.

         Rapid Technological Change. The Company is engaged in pharmaceutical
fields characterized by extensive research efforts, rapidly evolving technology
and intense competition from numerous organizations, including pharmaceutical
companies, biotechnology firms, academic institutions and others. New
developments are expected to continue at a rapid pace in both industry and
academia. There can be no assurance that research and discoveries by others will
not render any of the Company's programs or potential products obsolete or
uneconomical. In order to compete successfully, the Company will need to
complete development of and obtain regulatory approval of products that keep
pace with technological developments on a timely basis. Any failure by the
Company to anticipate or respond adequately to technological developments will
have a material adverse effect on the Company's business, financial condition
and results of operations.

         Patent, License and Proprietary Rights Uncertainties. The Company's
success will depend in part on its ability to obtain United States and foreign
patent protection for its products, preserve its trade secrets and proprietary
rights, and operate without infringing on the proprietary rights of third
parties or having third parties circumvent the Company's rights. Because of the
length of time and expense associated with bringing new products through
development and regulatory approval to the marketplace, the health care industry
has traditionally placed considerable importance on obtaining patent and trade
secret protection for significant new technologies, products and processes.
There can be no assurance that any patents will issue from any of the patent
applications owned by or licensed to the Company. Further, even if patents were
to issue, there can be no assurance that they will provide the Company with
significant protection against competitive products or otherwise be commercially
valuable. In addition, patent law relating to certain of the Company's fields of
interest, particularly as to the scope of claims in issued patents, is still
developing and it is unclear how this uncertainty will affect the Company's
patent rights. Litigation, which could be costly and time consuming, may be
necessary to enforce patents issued to the Company and/or to determine the scope
and validity of others' proprietary rights, in either case in judicial or
administrative proceedings. The Company's competitive position is also dependent
upon unpatented trade secrets which generally are difficult to protect. There
can be no assurance that others will not independently develop substantially
equivalent proprietary information and techniques or otherwise gain access to
the Company's trade secrets, that the Company's trade secrets will not be
disclosed or that the Company can effectively protect its rights to unpatented
trade secrets. As the biotechnology industry expands and more patents are
issued, the risk increases that the Company's potential products may give rise
to claims that they infringe the patents of others. Any such infringement
litigation would be costly and time consuming to the Company.

         The Company is aware of broad patents owned by third parties relating
to the manufacture, use, and sale of recombinant humanized antibodies,
recombinant humanized single chain antibodies and


                                       7
<PAGE>

genetically engineered animals. The Company has received notice from one company
regarding the existence of a patent which the owners claim may be relevant to
the development and commercialization of certain of the Company's proposed
UniGraft organ transplantation products. The Company has identified and is
testing various approaches which it believes should not infringe this patent and
which should permit commercialization of its products. There can be no assurance
that the owner of this patent will not seek to enforce the patent against the
Company's so-modified commercial products or against the development activities
related to the non-modified products. To the extent it becomes necessary, there
can be no assurance that the Company will be able to obtain a license on
commercially reasonable terms. If the Company does not obtain necessary
licenses, it could encounter delays in product market introductions while it
attempts to design around such patent, or could find that the development,
manufacture or sale of products requiring such a license could be foreclosed.
Further, there can be no assurance that owners of patents that the Company does
not believe are relevant to the Company's product development and
commercialization will not seek to enforce their patents against the Company.
Such action could result in litigation which would be costly and time consuming.
There can be no assurance that the Company would be successful in such
litigations. The Company is currently unaware of any such threatened action.

         Certain of the licenses by which the Company obtained its rights in and
to certain technologies require the Company to diligently commercialize or
attempt to commercialize such technologies. There can be no assurance that the
Company will meet such requirements, and failure to do so for a particular
technology could result in the Company losing its rights to that technology.

         Currently, the Company has not sought to register its potential
trademarks and there can be no assurance that the Company will be able to obtain
registration for such trademarks.

         No Assurance of FDA Approval; Government Regulation. The preclinical
and clinical testing, manufacturing, and marketing of the Company's products are
subject to extensive regulation by numerous government authorities in the United
States and other countries, including, but not limited to, the FDA. Among other
requirements, FDA approval of the Company's products, including a review of the
manufacturing processes and facilities used to produce such products, will be
required before such products may be marketed in the United States. Similarly,
marketing approval by a foreign governmental authority is typically required
before such products may be marketed in a particular foreign country. In order
to obtain FDA approval of a product, the Company must, among other things,
demonstrate to the satisfaction of the FDA that the product is safe and
effective for its intended uses and that the Company is capable of manufacturing
the product with procedures that conform to the FDA's then current good
manufacturing practice ("cGMP") regulations, which must be followed at all
times. The process of seeking FDA approvals can be costly, time consuming, and
subject to unanticipated and significant delays. There can be no assurance that
such approvals will be granted to the Company on a timely basis, or at all. Any
delay in obtaining or any failure to obtain such approvals would adversely
affect the Company's ability to introduce and market products and to generate
product revenue.

         The Company's research and development processes involve the controlled
use of hazardous materials. The Company is subject to federal, state and local
laws and regulations governing the use, manufacture, storage, handling and
disposing of such materials and certain waste products. In the event of such an
accident, the Company could be held liable for any damages that result and any
such liability could exceed the resources of the Company. There can be no
assurance that the Company will not be required to incur significant costs to
comply with the environmental laws and regulations in the future, or that the
business, financial condition and results of operations of the Company will not
be materially adversely affected by current or future environmental laws or
regulations.

         Substantial Competition. The pharmaceutical and biotechnology
industries are characterized by intense competition. Many companies, including
major pharmaceutical and chemical companies, as well as specialized
biotechnology companies, are engaged in activities similar to those of the
Company. Certain of these companies have substantially greater financial and
other resources, larger research and development staffs, and more extensive
marketing and manufacturing organizations than the Company. Many of these
companies have significant experience in preclinical testing, human clinical
trials, product manufacturing, marketing and distribution and other regulatory
approval procedures. In addition, colleges, universities, governmental agencies
and other public and private research organizations conduct


                                       8
<PAGE>

research and may market commercial products on their own or through joint
ventures. These institutions are becoming more active in seeking patent
protection and licensing arrangements to collect royalties for use of technology
that they have developed. These institutions also compete with the Company in
recruiting and retaining highly qualified scientific personnel.

         In particular, T-Cell Sciences, Inc. and Chiron Corporation have both
publicly announced intentions to develop complement inhibitors to treat diseases
related to trauma and inflammation indications and the Company is aware that
SmithKline Beecham Plc, Merck & Co., Inc. and CytoMed Inc. are attempting to
develop similar therapies. In addition, each of Bayer A.G. ("Bayer"), Immunex
Corporation, Pharmacia & Upjohn and Rhone-Poulenc Rorer, Inc. sells a product
which is used to reduce surgical bleeding during CPB. The Company is also aware
of announced and ongoing clinical trials of certain companies, including
Autoimmune, Inc., ImmuLogic Pharmaceutical Corporation, Neurocrine Biosciences,
Inc., and Anergen, Inc. employing T-cell specific tolerance technologies and
addressing patients with multiple sclerosis or diabetes mellitus. Baxter
Healthcare Corporation and Sandoz, Inc., in collaboration with Biotransplant
Inc., have publicly announced intentions to commercially develop xenograft
organs and the Company is aware that Diacrin Inc. is also working in this field.
These companies may succeed in developing products that are more effective or
less costly than any that may be developed by Alexion and may also prove to be
more successful than Alexion in production and marketing. Competition may
increase further as a result of potential advances in the commercial
applicability of biotechnology and greater availability of capital for
investment in these fields.

         Dependence on Qualified Personnel. The Company is highly dependent upon
the efforts of its senior management and scientific personnel including its
consultants, generally, and Dr. Leonard Bell, its President and Chief Executive
Officer, in particular. The Company and Dr. Bell are parties to an employment
agreement which expires on April 1, 2000. The loss of the services of one or
more of these individuals could have a material adverse effect on the Company's
ability to achieve its development objectives on a timely basis or at all. The
Company has a $2,000,000 key man life insurance policy on the life of Dr. Bell
of which the Company is the beneficiary. Because of the specialized scientific
nature of its business, Alexion is also highly dependent upon its ability to
continue to attract and retain qualified scientific and technical personnel.
There is intense competition for qualified personnel in the areas of the
Company's activities, and there can be no assurance that Alexion will be able to
continue to attract and retain the qualified personnel necessary for the
development of its business. Loss of the services of, or failure to recruit, key
scientific and technical personnel would be significantly detrimental to the
Company's product development programs.

         All members of the Company's Board of Scientific Advisors and the
Company's other scientific consultants are employed on a full-time basis by
academic or research institutions. Accordingly, such advisors and consultants
will be able to devote only a small portion of their time to the Company. In
addition, in certain circumstances, inventions or processes discovered by them
may not become the property of the Company but may be the property of their
full-time employers or of other companies and institutions for which they now
consult. There can be no assurance that the interests and motivations of the
Company's collaborators are or will remain consistent with those of the Company.
Furthermore, there can be no assurance that the Company will be able to
successfully negotiate license rights to the results of collaborations or that
such licenses will be on commercially reasonable terms.

         Dependence on Outside Parties and Collaborators. The Company's strategy
for the research, development, manufacture and commercialization of certain of
its products contemplates that it will enter into various arrangements with
corporate partners, licensors, licensees, outside researchers, consultants and
others and, therefore, the success of the Company is, and will be, dependent in
part upon the efforts of outside parties. There can be no assurance that the
Company will be able to negotiate acceptable collaborative arrangements to
develop or commercialize its products, that arrangements or other collaborations
entered into, if any, will be successful, or that current or potential
collaborators will not pursue treatments for other diseases or seek alternative
means of developing treatments for the diseases targeted by programs with the
Company. The Company has entered into research and development agreements with
US Surgical and GTI/Novartis to commercialize potential products to be developed
in the UniGraft program and for gene therapy. The amount and timing of resources
which US Surgical, GTI/Novartis or any other potential parties to collaboration
arrangements devote to these activities may not be within the control of the
Company. There can be no assurance that outside parties and


                                       9
<PAGE>

collaborators will perform their obligations as expected or that any revenue
will be derived from outside arrangements. The Joint Development Agreement with
US Surgical may be terminated by US Surgical for any or no reason effective on
or after January 1, 1998, if notice is given by US Surgical at least six months
prior thereto. If any of the Company's collaborators breaches or terminates its
agreement with the Company or otherwise fails to conduct its collaborative
activities in a timely manner, the development or commercialization of the
product candidate or the research program which is the subject of the agreement
may be delayed and the Company may be required to undertake unforeseen
additional responsibilities or to devote additional resources to development or
commercialization or terminate the development or commercialization. This could
have a material adverse effect on the Company's prospects, financial condition,
intellectual property position and results of operations.

         Limited Manufacturing, Marketing, Sales, Clinical Testing and
Regulatory Compliance Capability. The Company has not invested in the
development of commercial manufacturing, marketing, distribution or sales
capabilities. Moreover, the Company has insufficient capacity to manufacture
more than one product candidate at a time or to manufacture its product
candidates for later stage clinical development or commercialization. If the
Company is unable to develop or contract for additional manufacturing
capabilities on acceptable terms, the Company's ability to conduct human
clinical testing will be materially adversely affected, resulting in delays in
the submission of products for regulatory approval and in the initiation of new
development programs, which could have a material adverse effect on the
Company's competitive position and the Company's prospects for achieving
profitability. In addition, as the Company's product development efforts
progress, the Company will need to hire additional personnel skilled in clinical
testing, regulatory compliance, and, if the Company develops products with
commercial potential, marketing and sales. There can be no assurance that the
Company will be able to acquire, or establish third-party relationships to
provide, any or all of these resources or be able to obtain required personnel
and resources to manufacture, or perform testing or engage in marketing,
distribution and sales on its own.

         Uncertainty of Availability of Health Care Reimbursement. The Company's
ability to commercialize its products successfully may depend in part on the
extent to which reimbursement for the cost of such products and related
treatments will be available from government health administration authorities,
private health insurers and other organizations. Third-party payors are
attempting to control costs by limiting coverage of products and treatments and
the level of reimbursement for medical products and services. Significant
uncertainty exists as to the reimbursement status of newly approved health care
products, and if the Company succeeds in bringing one or more products to
market, there can be no assurance that these products will be considered
cost-effective, that reimbursement will be available, or, if available, that the
payor's reimbursement policies will not materially adversely affect the
Company's ability to sell its products on a profitable basis.

         Product Liability; Potential Liability for Human Clinical Trials. The
Company's business exposes it to potential product liability risks which are
inherent in the testing, manufacturing, marketing and sale of human therapeutic
products and there can be no assurance that the Company will be able to avoid
significant product liability exposure. With respect to the Company's UniGraft
program, little is known about the potential long-term health risks of
transplanting non-human tissue into humans. In addition to product liability
risks associated with sales of products, the Company may be liable to the claims
of individuals who participate in human clinical trials of its products. While
the Company has obtained, and will seek, waivers of liability from all persons
who participated or may in the future participate in human clinical trials
conducted by or on behalf of the Company, there can be no assurance that waivers
will be effective to protect the Company from liability or the costs of product
liability litigation. The Company currently has product liability insurance to
cover certain liabilities relating to the conduct of human clinical trials.
However, there can be no assurance that it will be able to maintain such
insurance on acceptable terms or that the insurance will provide adequate
protection against potential liabilities. An inability to maintain sufficient
insurance coverage at an acceptable cost or otherwise to protect against
potential product liability claims could prevent or limit the commercialization
of products developed by the Company. Furthermore, a product liability related
claim or recall could have a material adverse effect on the business, financial
condition and results of operations of the Company.

         Volatility of Share Price. The market prices for securities of
biopharmaceutical companies have been volatile. Factors such as announcements of
technological innovations or new commercial products


                                       10
<PAGE>

by the Company or its competitors, government regulation, patent or proprietary
rights developments, public concern as to the safety or other implications of
biopharmaceutical products, results of preclinical or clinical trials, positive
or negative developments related to the Company's collaborators and market
conditions in general may have a significant impact on the market price of the
Company's Common Stock.

         Dilutive Effect of Stock Issuances, Grants, Options and Warrants. As of
October 1, 1997, Alexion has granted options to purchase an aggregate of
approximately 1,467,009 shares of the Company's Common Stock under certain stock
option plans. Warrants to purchase an aggregate of approximately 871,387 of the
Company's Common Stock, including the Warrants, are also outstanding under
previous financing arrangements and other transactions. Many of these options
and warrants have exercise prices below the current market price of the
Company's Common Stock. In addition, the Company may issue additional stock,
warrants and/or options to raise capital in the future. The Company regularly
examines opportunities to expand its technology base through means such as
licenses, joint ventures and acquisition of assets or ongoing businesses and may
issue securities in connection with such transactions. The Company may also
issue additional securities in connection with its stock option plans. During
the terms of such options and warrants, the holders thereof are given the
opportunity to profit from a rise in the market price of the Company's Common
Stock. The exercise of such options and warrants may have an adverse effect on
the market value of the Company's Common Stock. The existence of such options
and warrants may adversely affect the terms on which the Company can obtain
additional equity financing. To the extent the exercise prices of such options
and warrants are less than the net tangible book value of the Company's Common
Stock at the time such options and warrants are exercised, the Company's
stockholders will experience an immediate dilution in the net tangible book
value of their investment.

         No Dividends. The Company has not paid dividends on any of its capital
stock since its inception and does not expect to pay cash or stock dividends on
its Common Stock in the foreseeable future.

         Possible Adverse Impact on Holders of Common Stock; Anti-takeover
Provisions; Rights Plan. The Board of Directors may issue one or more series of
Preferred Stock, without any action on the part of the stockholders of the
Company, the terms of which may adversely affect the rights of holders of Common
Stock. Issuance of Preferred Stock, which may be accomplished through a public
offering or a private placement, may dilute the voting power of holders of
Common Stock (such as by issuing Preferred Stock with super voting rights) and
may render more difficult the removal of current management, even if such
removal may be in the stockholders' best interests. Further, the issuance of
Preferred Stock may be used as an "anti-takeover" device without further action
on the part of the stockholders. On February 14, 1997, the Board of Directors of
Alexion declared a dividend distribution of one preferred stock purchase right
(a "Right") for each outstanding share of Common Stock of the Company. The
Rights are not exercisable until the date of the earlier to occur of (i) ten
business days following the time of a public announcement or notice to the
Company that a person or group of affiliated or associated persons has acquired
beneficial ownership of 20% or more of the outstanding shares of Common Stock of
the Company (such 20% beneficial owner, an "Acquiring Person"), or (ii) ten
business days, or such later date as may be determined by the Board of Directors
of the Company, after the date of the commencement or announcement by a person
of an intention to make a tender offer or exchange offer for an amount of Common
Stock which, together with the shares of such stock already owned by such
person, constitutes 20% or more of the outstanding shares of such Common Stock.
The Rights and the Rights Agreement, as well as certain provisions of Delaware
law are designed to prevent any unsolicited acquisitions of the Company's Common
Stock. These provisions and any issuance of Preferred Stock could prevent the
holders of Common Stock from realizing a premium on their shares.

         Ownership by Management and Principal Stockholders. On October 1, 1997,
directors and officers of the Company and certain principal stockholders and
their affiliates beneficially owned in the aggregate 2,095,934 shares of Common
Stock, representing 21.8% of the outstanding shares of Common Stock.
Accordingly, they have the ability to influence significantly the affairs of the
Company and matters requiring a stockholder vote, including the election of the
Company's directors, the amendment of the Company's charter documents, the
merger or dissolution of the Company and the sale of all or substantially all of
the Company's assets. The voting power of these holders may also discourage or
prevent any proposed takeover of the Company pursuant to a tender offer.


                                       11
<PAGE>

                                 USE OF PROCEEDS

         The Company will not receive any proceeds from the sale of the shares
of Common Stock by the Selling Stockholders. The proceeds, if any, received by
the Company upon the exercise of the Warrants will be utilized by the Company
for working capital purposes.

                              SELLING STOCKHOLDERS

         The following table sets forth certain information, as of September 29,
1997 regarding the beneficial ownership of Common Stock of each Selling
Stockholder and as adjusted to give effect to the sale of the Shares offered
hereby. The Shares are being registered to permit public secondary trading of
the Shares, and the Selling Stockholders may offer the Shares for resale from
time to time. See "Plan of Distribution."

         The Company is registering 935,782 shares of Common Stock issued to a
Selling Stockholder upon the conversion of the Series B Preferred Stock and
126,980 shares are issuable upon the exercise of the Warrants which were issued
by the Company in connection with the December 1993 private placement.


<TABLE>
<CAPTION>


                                                           Amount of                                             Amount of
                                                          Beneficial                                            Beneficial
                                                           Ownership                                             Ownership
                                                       Prior to Offering                                     After Offering
                                                  -------------------------                             --------------------------
                                                                                        Number of
                                                    Number                               Shares          Number           
                       Name of                     of Common        Percent               Being         of Common         Percent
                Selling Stockholder (1)           Shares (2)       of Class              Offered         Shares          of Class
               -----------------------            ----------       --------              -------         ------          --------
<S>                                               <C>              <C>                 <C>             <C>               <C>

Herbert Allen, Sr.                                   1,562             *                  1,562             0                  *

Herbert Allen Trust                                    781             *                    781             0                  *

Robert M. Arnold                                     1,562             *                  1,562             0                  *

Arthur Balik                                         3,333             *                  3,333             0                  *

Miriam Belsky (3)                                    6,750             *                  2,250            4,500               *

Paul Belsky (4)                                      3,124             *                    624            2,500               *

Barbara D. Bell (5)                                119,935            1.3                 1,666          118,269              1.3

Harold K. Bell (6)                                 119,935            1.3                 6,999          112,936              1.3

Biotech Target S.A. (7)                            935,782            9.5               935,782             0                  *

The Brookside Group, L.P. (8)                       19,999             *                  6,666           13,333               *

Michael W. Cleman (9)                                6,263             *                    781           5,482                *

Connecticut Seed Ventures, L.P. (10)                 6,250             *                  6,250             0                  *

John Fried (11)                                     86,936             *                  4,686           82,250               *

Mark Germain (12)                                   75,624             *                 15,624           60,000               *

I.H. Hammerman, II, TTEE for Mark L.                
  Hammerman (13)                                    56,296             *                  1,562           54,734               *

I.H. Hammerman, II, TTEE 
  for S.L. Hammerman, II (13)                       56,296             *                  1,562           54,734               *

I.H. Hammerman, II, TTEE for              
  Amy S. Hammerman-Cahn (13)                        56,296             *                  1,562           54,734               *

I.H. Hammerman, II, TTEE for
  Sandye H. Nast (13)                               56,296             *                  1,562           54,734               *

Irwin H. Kramer and Terry Allen Kramer
  JTROS                                              4,843             *                  4,843             0                  *

Mutual of America Life Insurance Company (14)      250,000            2.7                50,000          200,000              2.2

NELLA Company                                        3,350             *                  3,350             0                  *

Joseph A. Penner, M.D. (15)                          4,686             *                  1,562            3,124               *

Alan J. Rubin                                        2,500             *                  2,500             0                  *

John Simon (16)                                      5,641             *                  4,912            729                 *

Susan K. Wilson                                        781             *                    781             0                  *
</TABLE>


                                       12
<PAGE>

- ---------------------------
* Less than one percent

(1)      Except as otherwise indicated, the shares of Common Stock attributable
         to each Selling Stockholder represents shares issuable upon exercise of
         warrants issued by the Company in private placement transactions during
         1993. The warrants allow the holders thereof to purchase shares of
         Common Stock at a price of $7.50 per share (unless otherwise
         indicated), subject to adjustment in certain circumstances and are
         automatically exercisable at any time prior to the close of business on
         December 4, 1997.

(2)      The number of shares beneficially owned is determined by assuming that
         options, warrants or shares of Series B Preferred Stock, as the case
         may be, held by such person which are exercisable or convertible within
         60 days have been exercised or converted.

(3)      Of the 6,750 shares beneficially owned by this Selling Stockholder, the
         2,250 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $15.00 per share.

(4)      Of the 3,124 shares beneficially owned by this Selling Stockholder, the
         624 shares being offered by this Selling Stockholder are issuable upon
         the exercise of warrants to purchase the Common Stock at an exercise
         price of $7.50 per share.

(5)      Of the 119,935 shares beneficially owned by this Selling Stockholder,
         55,105 shares are held jointly with Harold K. Bell, 49,499 shares are
         held by Harold K. Bell and 6,666 shares are held by this Selling
         Stockholder. In addition, 6,999 shares are issuable to Harold K. Bell
         upon the exercise of warrants to purchase the Common Stock at a
         purchase price of $7.50 per share and 1,666 shares being offered by
         this Selling Stockholder are issuable to the Selling Stockholder upon
         the exercise of warrants to purchase the Common Stock at an exercise
         price of $7.50 per share.

(6)      Of the 119,935 shares beneficially owned by this Selling Stockholder,
         55,105 shares are held jointly with Barbara Bell, 6,666 shares are held
         by Barbara Bell and 49,499 shares are held by this Selling Stockholder.
         In addition, 1,666 shares are issuable to Barbara Bell upon the
         exericse of warrants to purchase the Common Stock at a purchase price
         of $7.50 per share and 6,999 shares being offered by this Selling
         Stockholder are issuable to the Selling Stockholder upon the exercise
         of warrants to purchase the Common Stock at an exercise price of $7.50
         per share.

(7)      The 935,782 shares beneficially owned by this Selling Stockholder are
         issuable upon conversion of Series B Preferred Stock.

(8)      Of 19,999 shares beneficially owned by this Selling Stockholder, the
         6,666 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $15.00 per share.

(9)      Of 6,263 shares beneficially owned by this Selling Stockholder, the 781
         shares being offered by this Selling Stockholder are issuable upon the
         exercise of warrants to purchase Common Stock at an exercise price of
         $7.50 per share. Michael W. Cleman is a Scientific Advisor to the
         Company.

(10)     The 6,250 shares beneficially owned by this Selling Stockholder are
         issuable upon the exercise of warrants to purchase the Common Stock at
         an exercise price of $15.00 per share.

(11)     Includes 4,686 shares being offered by this Selling Stockholder that
         may be acquired upon the exercise of warrants to purchase the Common
         Stock at an exercise price of $7.50 per share and 10,900 shares that
         may be acquired on the exercise of options that are exercisable within
         60 days of October 1, 1997. Excludes 3,400 shares obtainable through
         the exercise of options granted to Dr. Fried which are not exercisable
         within 60 days of October 1, 1997. Dr. Fried is Chairman of the Board
         of the Company.

(12)     Of 75,624 shares beneficially owned by this Selling Stockholder, the
         15,624 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $7.50 per share.

(13)     Of 56,296 shares benefically owned by this Selling Stockholder, 11,512
         shares are held by I.H. Hammerman, II, TTEE for Mark L. Hammerman,
         11,512 shares are held by I.H. Hammerman, II, TTEE for S.L. Hammerman,
         II, 11,512 shares are held by I.H. Hammerman, II, TTEE for Amy S.
         Hammerman-Cahn, 11,512 shares are held by I.H. Hammerman, II, TTEE for
         Sandye H. Nast and 4,000 shares are held by I.H. Hammerman, II. In
         addition, 1,562 shares are issuable to I.H. Hammerman, II, TTEE for
         Mark L. Hammerman upon the exercise of warrants to purchase the Common
         Stock at an exercise price of $7.50 per share, 1,562 shares are
         issuable to I.H. Hammerman, II, TTEE for S.L. Hammerman, II, upon the
         exercise of warrants to purchase the Common Stock at an exercise price
         of $7.50 per share, 1,562 shares are issuable to I.H. Hammerman, II,
         TTEE for Amy S. Hammerman-Cahn upon the exercise of warrants to
         purchase the Common Stock at an exercise price of $7.50 per share and
         1,562 shares are issuable to I.H. Hammerman, II, TTEE for Sandye H.
         Nast upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $7.50 per share.

(14)     Of 250,000 shares beneficially owned by this Selling Stockholder, the
         50,000 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $7.50 per share.

(15)     Of 4,686 shares beneficially owned by this Selling Stockholder, the
         1,562 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $15.00 per share.

(16)     Of 5,641 shares beneficially owned by this Selling Stockholder, the
         4,912 shares being offered by this Selling Stockholder are issuable
         upon the exercise of warrants to purchase the Common Stock at an
         exercise price of $15.00 per share.



                                       13
<PAGE>

                              PLAN OF DISTRIBUTION

         The distribution of the shares of Common Stock by the Selling
Stockholders may be effected from time to time in one or more transactions
(which may involve block transactions) in the over-the-counter market or on
NASDAQ (or any exchange on which the Common Stock may then be listed) in
negotiated transactions, through the writing of options (whether such options
are listed on an options exchange or otherwise), or a combination of such
methods of sale, at market prices prevailing at the time of sale, at prices
related to such prevailing market prices or at negotiated prices. The Selling
Stockholders may effect such transactions by selling shares to or through
broker-dealers, and such broker-dealer may receive compensation in the form of
underwriting discounts, concessions or commissions from the Selling Stockholders
and/or purchasers of shares for whom they may act as agent (which compensation
may be in excess of customary commissions). The Selling Stockholders may also
sell such shares pursuant to Rule 144 promulgated under the Securities Act, or
may pledge shares as collateral for margin accounts and such shares could be
resold pursuant to the terms of such accounts. The Selling Stockholders and any
broker-dealers that act in connection with the sale of the Common Stock might be
deemed to be "underwriters" within the meaning of Section 2(11) of the
Securities Act and any commission received by them and any profit on the resale
of the shares of Common Stock as principal might be deemed to be underwriting
discounts and commissions under the Securities Act. The Selling Stockholders may
agree to indemnify any agent, dealer or broker-dealer that participates in
transactions involving sales of the shares against certain liabilities,
including liabilities arising under the Securities Act.

         Because the Selling Stockholders may be deemed to be "underwriters"
within the meaning of Section 2(11) of the Securities Act, the Selling
Stockholders will be subject to prospectus delivery requirements under the
Securities Act. Furthermore, in the event of a "distribution" of the shares,
such Selling Stockholders, any selling broker or dealer and any "affiliated
purchasers" may be subject to Regulation M under the Exchange Act, which
Regulation prohibits, with certain exceptions, any such person from bidding for
or purchasing any security which is the subject of such distribution until his
participation in that distribution is completed. In addition, Regulation M under
the Exchange Act prohibits, with certain exceptions, any "stabilizing bid" or
"stabilizing purchase" for the purpose of pegging, fixing or stabilizing the
price of Common Stock in connection with this offering.

         In order to comply with certain state securities laws, if applicable,
the Common Stock will not be sold in a particular state unless such securities
have been registered or qualified for sale in such state or any exemption from
registration or qualification is available and complied with.

         The Company will not receive any of the proceeds from the sale of
Common Stock by the Selling Stockholders. The proceeds, if any, from the
exercise of the Warrants will be received by the Company; no brokerage
commissions or discounts will be paid in connection therewith.

                                  LEGAL MATTERS

         The validity of the issuance of the shares of Common Stock offered
hereby will be passed upon for the Company by Fulbright & Jaworski L.L.P., New
York, New York.

                                     EXPERTS

         The audited financial statements incorporated by reference in this
Prospectus and elsewhere in the Registration Statement have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
report with respect thereto, and such report is incorporated herein in reliance
upon the authority of said firm as experts in giving said report.


                                       14
<PAGE>

                                     PART II

ITEM 14.          OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The following table sets forth the Company's estimates (other than the
SEC registration fee) of the expenses in connection with the issuance and
distribution of the shares of Common Stock being registered. None of the
following expenses are being paid by the Selling Stockholders.


         SEC registration fee                               $ 3,665.00
         Legal fees and expenses                            $15,000.00
         Accounting fees and expenses                       $ 3,000.00
         Miscellaneous expenses                             $ 3,335.00
                                                            ----------
                  Total:                                    $25,000.00
                                                            ==========


ITEM 15.          INDEMNIFICATION OF DIRECTORS AND OFFICERS.

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

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

         In accordance with Section 145 of the DGCL, Section EIGHTH of the
Company's Certificate of Incorporation, as amended (the "Certificate") provides
that the Company shall indemnify each person who is or was a director, officer,
employee or agent of the Company (including the heirs, executors, administrators
or estate of such person) or is or was serving at the request of the Company as
a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise, to the fullest extent permitted. The
indemnification provided by the Certificate shall not be deemed exclusive of any
other rights to which any of those seeking indemnification or advancement of
expenses may be entitled under any by-law, agreement, vote of shareholders or
disinterested directors or otherwise, both as to action in his official capacity
and as to action in another capacity while holding such office, and shall
continue as to a person who has ceased to be a director, officer, employee or
agent and shall inure to the benefit of the heirs, executors and administrators
of such a person. Expenses (including attorneys' fees) incurred in defending a
civil, criminal, administrative or investigative action, suit or proceeding
shall be paid by the Company in advance of the final disposition of such action,
suit or proceeding upon receipt of an undertaking by or on behalf of the
indemnified person to repay such amount if it shall ultimately be determined
that he is not entitled to be indemnified by the Company. Section NINTH of the
Certificate provides that a director of the Company shall not be personally
liable to the Company or its stockholders for monetary damages for breach of
fiduciary duty as a director, except for liability (i) for any breach of the
director's duty of loyalty to the Company or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (iii) under Section 174 of the DGCL, or (iv) for any
transaction from which the director derived an improper personal benefit.


                                      II-1
<PAGE>

ITEM 16.          EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

  (a)    Exhibits.

4.1      Form of Stock Purchase Agreement between the Registrant and the 
         investors in the June 1997 private placement (incorporated by reference
         to Exhibit 10.41 to the Company's Annual Report on Form 10-K for the
         year ended July 31, 1997).*

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

10.1     Form of Investor Rights Agreement, dated December 23, 1994, between the
         Company and the purchasers of the Company's Series A Preferred Stock
         (incorporated by reference to Exhibit 10.15 to the Company's
         Registration Statement on Form S-1 (Registration No. 33-00202)).*

10.2     Form of Warrant (incorporated by reference to Exhibit 10.17 to the
         Company's Registration Statement on Form S-1 (Registration No.
         33-00202)).*

10.3     Form of Warrant (incorporated by reference to Exhibit 10.18 to the
         Company's Registration Statement on Form S-1 (Registration No.
         33-00202)).*

10.4     Form of Warrant (incorporated by reference to Exhibit 10.19 to the
         Company's Registration Statement on Form S-1 (Registration No.
         33-00202)).*

10.5     Stock Purchase Agreement dated September 8, 1997 by and between the
         Company and Biotech Target S.A. (incorporated by reference
         to Exhibit 10.42 to the Company's Annual Report on Form 10-K for the
         year ended July 31, 1997).*

23.1     Consent of Fulbright & Jaworski L.L.P. (included in Exhibit 5)

23.2     Consent of Arthur Andersen LLP

24.1     Power of Attorney (included on signature page)

- -------------
* Incorporated by reference.

ITEM 17.          UNDERTAKINGS.

       (a)     The undersigned Registrant hereby undertakes:

               (1) To file, during any period in which offers or sales are being
made, a post-effective amendment of this registration statement:

                      (i)     To include any prospectus required by 
Section 10(a)(3) of the Securities Act 1933;

                      (ii) To reflect in the prospectus any facts or events
arising after the effective date of the registration statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
registration statement;

                      (iii)   To include any material information with respect 
to the plan of distribution previously disclosed in the registration statement 
of any material change to such information in the registration statement;

       Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
if the information required to be included in a post-effective amendment by
those paragraphs is contained in periodic reports filed by the registrant
pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934
that are incorporated by reference in the registration statement.


                                      II-2
<PAGE>

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

               (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

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

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


                                      II-3
<PAGE>

                                   SIGNATURES

       PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED,
THE REGISTRANT HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS
BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF NEW HAVEN
AND STATE OF CONNECTICUT ON THE 2ND DAY OF DECEMBER, 1997.

                                             ALEXION PHARMACEUTICALS, INC.

                                             By:   /s/ LEONARD BELL
                                             -----------------------------------
                                             Leonard Bell, M.D.
                                             President, Chief Executive Officer,
                                             Secretary and Treasurer

                                POWER OF ATTORNEY

       KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature
appears below constitutes and appoints LEONARD BELL, M.D. and DAVID W. KEISER,
or either of them, his true and lawful attorney-in-fact and agent with full
power of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities, to sign any and all amendments (including
post-effective amendments) to this Registration Statement, and to file the same
with all exhibits thereto, and all documents in connection therewith, with the
Securities and Exchange Commission, granting said attorney-in-fact and agent,
and each of them, full power and authority to do and perform each and every act
and thing requisite and necessary to be done in and about the premises, as fully
to all intents and purposes as he or she might or could do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent or any of
them, or their or his substitute or substitutes, may lawfully do or cause to be
done by virtue hereof.

       Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:


<TABLE>
<S>                            <C>                                    <C>
/s/ LEONARD BELL               President, Chief Executive Officer,    December 2, 1997
- ---------------------------    Secretary, Treasurer and Director
Leonard Bell, M.D.             (principal executive officer)
                               

/s/ DAVID W. KEISER            Executive Vice President and           December 2, 1997
- ---------------------------    Chief Operating Officer
David W. Keiser                (principal financial officer)
                               

/s/ BARRY P. LUKE              Senior Director of Finance             December 2, 1997
- ---------------------------    and Administration (principal
Barry P. Luke                  accounting officer)
                               

/s/ JOHN H. FRIED              Chairman of the Board of Directors     December 2, 1997
- ---------------------------
John H. Fried, Ph.D.

/s/ JOSEPH A. MADRI            Director                               December 2, 1997
- ---------------------------
Joseph A. Madri, Ph.D., M.D.

/s/ LEONARD MARKS, JR.         Director                               December 2, 1997
- ---------------------------
Leonard Marks, Jr., Ph.D.

                               Director                               December 2, 1997
- ---------------------------
Max Link, Ph.D.

/s/ EILEEN M. MORE             Director                               December 2, 1997
- ---------------------------
Eileen M. More

/s/ TIMOTHY F. HOWE            Director                               December 2, 1997
- ---------------------------
Timothy F. Howe

</TABLE>


                                      II-4
<PAGE>

                                  EXHIBIT INDEX

Exhibit
Number                                  Exhibit
- -------                                 -------

 4.1              Form of Stock Purchase Agreement between the Registrant and
                  the investors in the June 1997 private placement (incorporated
                  by reference to Exhibit 10.41 to the Company's Annual Report 
                  on Form 10-K for the year ended July 31, 1997).*

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

 10.1             Form of Investor Rights Agreement, dated December 23, 1994,
                  between the Company and the purchasers of the Company's Series
                  A Preferred Stock (incorporated by reference to Exhibit 10.15
                  to the Company's Registration Statement on Form S-1
                  (Registration No. 33-00202)).*

 10.2             Form of Warrant (incorporated by reference to Exhibit 10.17 to
                  the Company's Registration Statement on Form S-1 (Registration
                  No. 33-00202)).*

 10.3             Form of Warrant (incorporated by reference to Exhibit 10.18 to
                  the Company's Registration Statement on Form S-1 (Registration
                  No. 33-00202)).*
 10.4             Form of Warrant (incorporated by reference to Exhibit 10.19 to
                  the Company's Registration Statement on Form S-1 (Registration
                  No. 33-00202)).*

 10.5             Stock Purchase Agreement dated September 8, 1997 by and
                  between the Company and Biotech Target S.A. (incorporated 
                  by reference to Exhibit 10.42 to the Company's Annual Report 
                  on Form 10-K for the year ended July 31, 1997).*

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

 23.2             Consent of Arthur Andersen LLP, Independent Auditors.

 24.1             Power of Attorney (included in signature page).

- -------------
* Incorporated by reference.



                                                                     Exhibit 5.1
                              FULBRIGHT & JAWORSKI
                                     L.L.P.
                   A REGISTERED LIMITED LIABILITY PARTNERSHIP       HOUSTON
                                666 FIFTH AVENUE                WASHINGTON, D.C.
                         NEW YORK, NEW YORK 10103-3198               AUSTIN
                                                                   SAN ANTONIO
                                                                     DALLAS
                                                                    NEW YORK
                                                                   LOS ANGELES
TELEPHONE: 212/318-3000                                              LONDON
FACSIMILE: 212/752-5958                                             HONG KONG

WRITER'S DIRECT DIAL NUMBER:

                                December 2, 1997


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

Dear Sirs:

     We refer to the Registration Statement on Form S-3 (the "Registration
Statement"), filed by Alexion Pharmaceuticals, Inc. (the "Company") on behalf of
the selling stockholders (the "Selling Stockholders") with the Securities and
Exchange Commission under the Securities Act of 1933, as amended, relating to
126,980 shares of the Company's Common Stock, $.0001 par value (the "Warrant
Shares") issuable upon exercise of warrants (the "Warrants"), and an aggregate
of 935,782 shares of Common Stock (the "Conversion Shares") issuable upon the
conversion of outstanding Series B Preferred Stock, to be sold by the Selling
Stockholder.

     As counsel for the Company, we have examined such corporate records,
documents and such questions of law as we have considered necessary or
appropriate for purposes of this opinion and, upon the basis of such
examination, advise you that in our opinion the 126,908 Warrant Shares issuable
upon the exercise of the Warrants have been duly and validly authorized and,
subsequent to the exercise of the Warrants and payment of the exercise price by
the Selling Stockholders, will be legally issued, fully paid and nonassessable
and the 935,782 Conversion Shares issuable upon the conversion of the Series B
Preferred Stock have been duly and validly authorized and, subsequent to the
conversion of the Series B Preferred Stock by the Selling Stockholders, will be
legally issued, fully paid and nonassessable.

     We consent to the filing of this opinion as an exhibit to the Registration
Statement and the reference to this firm under the caption "Legal Matters" in
the prospectus contained therein and elsewhere in the Registration Statement and
prospectus. This consent is not to be construed as an admission that we are a
party whose consent is required to be filed with the Registration Statement
under the provisions of the Securities Act of 1933, as amended.


                                                Very truly yours,

                                                /s/ FULBRIGHT & JAWORSKI L.L.P.





                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the
incorporation by reference in this registration statement of our report dated
August 29, 1997 included in Alexion Pharmaceuticals, Inc.'s Form 10-K for the
year ended July 31, 1997 and to all references to our firm included in this
registration statement.


/s/ ARTHUR ANDERSEN LLP
- -----------------------
Hartford, Connecticut
December 1, 1997






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