CYTOTHERAPEUTICS INC/DE
DEF 14A, 1999-04-08
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>


            FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON
                                APRIL 5, 1999

                                SCHEDULE 14A
                               (RULE 14A-101)
                  INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
 
    Filed by the Registrant /X/
    Filed by a party other than the Registrant / /
 
    Check the appropriate box:
- --------------------------------------------------------------------------------
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    /X/  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 
         240.14a-12

                              CYTOTHERAPEUTICS, INC. 
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11
- --------------------------------------------------------------------------------
    (1) Title of each class of securities to which transaction applies:
            N/A
        ------------------------------------------------------------------------
    (2) Aggregate number of securities to which transaction applies:
            N/A
        ------------------------------------------------------------------------
    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):
            N/A
        ------------------------------------------------------------------------
    (4) Proposed maximum aggregate value of transaction:
            N/A
        ------------------------------------------------------------------------
    (5) Total fee paid:
            N/A
        ------------------------------------------------------------------------

- --------------------------------------------------------------------------------
/ / Fee paid previously with preliminary materials.
- --------------------------------------------------------------------------------
/ / Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

    (1) Amount Previously Paid:
    (2) Form, Schedule or Registration Statement No.:
    (3) Filing Party:
    (4) Date Filed:


<PAGE>
                             CYTOTHERAPEUTICS, INC.
                         701 GEORGE WASHINGTON HIGHWAY
                               LINCOLN, RI 02865
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
 
                           TO BE HELD ON MAY 11, 1999
 
    Notice is hereby given that the Annual Meeting of Stockholders of
CytoTherapeutics, Inc. ("CytoTherapeutics" or the "Company") will be held on May
11, 1999 at 1:00 P.M. at the Company's executive offices located at 701 George
Washington Highway, Lincoln, Rhode Island 02865 for the following purposes:
 
    1.  To elect two Class II directors to serve until the 2002 Annual Meeting
of Stockholders;
 
    2.  To consider and vote upon a proposal to ratify the selection of Ernst &
Young LLP as independent public accountants for the Company for the fiscal year
ending December 31, 1999; and
 
    3.  To transact any and all other business that may properly come before the
meeting.
 
    The Board of Directors has fixed the close of business on March 31, 1999 as
the record date for determining those Stockholders who are entitled to notice of
and to vote at the meeting. The stock transfer books will not be closed between
the record date and the date of the meeting.
 
    Representation of at least a majority of all outstanding shares of Common
Stock of CytoTherapeutics is required to constitute a quorum. Accordingly, it is
important that your shares be represented at the meeting. WHETHER OR NOT YOU
PLAN TO ATTEND THE ANNUAL MEETING, PLEASE SIGN AND DATE THE ENCLOSED PROXY AND
RETURN IT PROMPTLY IN THE ENCLOSED ENVELOPE. Your proxy may be revoked at any
time prior to the time it is voted.
 
    Please read the proxy material carefully. Your vote is important and the
Company appreciates your cooperation in considering and acting on the matters
presented.
 
                                          By Order of the Board of Directors,
 
                                          PHILIP K. YACHMETZ
                                          SECRETARY
 
Lincoln, Rhode Island
April 7, 1999
<PAGE>
                                PROXY STATEMENT
 
                         ANNUAL MEETING OF STOCKHOLDERS
                                       OF
                             CYTOTHERAPEUTICS, INC.
 
    The enclosed form of proxy is solicited on behalf of the Board of Directors
of CytoTherapeutics, Inc. (the "Company") for use at the Annual Meeting of
Stockholders (the "Annual Meeting") to be held on May 11, 1999 at 1:00 P.M. at
the Company's principal executive offices located at 701 George Washington
Highway, Lincoln, Rhode Island 02865. The cost of solicitation of proxies will
be borne by the Company. Directors, officers and employees of the Company may
also solicit proxies by telephone, facsimile or in person for no additional
compensation. The Company will reimburse banks, brokerage firms, and other
custodians, nominees and fiduciaries for reasonable expenses incurred by them in
sending proxy materials to the beneficial owners of shares.
 
    Only stockholders of record at the close of business on March 31, 1999 are
entitled to notice of and to vote at the Annual Meeting or any adjournment
thereof. There were 18,374,089 shares of the Company's Common Stock, $.01 par
value (the "Common Stock"), outstanding on such date, each of which is entitled
to one vote for each share on the matters to be voted upon.
 
    Shares of the Company's Common Stock represented by proxies in the form
enclosed which are properly executed and returned to CytoTherapeutics and not
revoked, will be voted as specified therein by the stockholder. In the absence
of contrary instructions, or in instances where no specification is made, the
shares will be voted FOR the election as directors of the nominees as described
herein under "Proposal Number 1--Election of Directors," FOR ratification of the
selection of accountants as described herein under "Proposal Number
2--Ratification of Selection of Independent Public Accountants," and in the
discretion of the named proxies, as to any other matter that may properly come
before the Annual Meeting. Any stockholder signing and delivering a proxy may
revoke it at any time before it is voted by delivering to the Secretary of the
Company a written revocation or a duly executed proxy bearing a date later than
the date of the proxy being revoked. Any record stockholder attending the Annual
Meeting in person may revoke his or her proxy and vote his or her shares.
 
    The Annual Report to Stockholders for the Company's fiscal year ended
December 31, 1998 and this proxy statement were first mailed to stockholders on
or about April 7, 1999.
 
                QUORUM, REQUIRED VOTES, AND METHOD OF TABULATION
 
    Consistent with Delaware law and under the Company's By-laws, a majority of
the shares entitled to be cast on a particular matter, present in person or
represented by proxy, constitutes a quorum as to such matter. Persons appointed
by the Company to act as election inspectors for the meeting will count votes
cast by proxy or in person at the Annual Meeting.
 
    Election of directors by stockholders shall be determined by a plurality of
the votes cast by the stockholders entitled to vote at the election that are
present in person or represented by proxy. The approval of the proposal to
ratify the selection of accountants requires a majority of the votes cast to be
affirmative.
 
    The election inspectors will count shares represented by proxies that
withhold authority to vote for a nominee for election as a director or that
reflect abstentions and "broker non-votes" (i.e., shares represented at the
meeting held by brokers or nominees as to which (i) instructions have not been
received from the beneficial owners or persons entitled to vote and (ii) the
broker or nominee does not have discretionary voting power on a particular
matter) only as shares that are present and entitled to vote on
<PAGE>
the matter for purposes of determining the presence of a quorum, but neither
abstentions nor broker non-votes have any effect on the outcome of voting on the
matter.
 
    Management does not know of any matters to be presented at this Annual
Meeting other than those set forth in this Proxy Statement and in the Notice
accompanying this Proxy Statement. If other matters should properly come before
the meeting, the proxy holders will vote such matters in accordance with their
best judgment. Any stockholder has the right to revoke his or her proxy at any
time before it is voted.
 
                                       2
<PAGE>
                               PROPOSAL NUMBER 1
                             ELECTION OF DIRECTORS
 
    The number of directors is currently fixed at seven. The Company's
Certificate of Incorporation and By-laws provide for the classification of the
Board of Directors into three classes, as nearly equal in number as possible,
with the term of office of one class expiring each year. Unless otherwise
instructed, the enclosed proxy will be voted to elect the nominees named below,
each of whom are now Class II directors, as Class II directors for a term of
three years expiring at the 2002 Annual Meeting of Stockholders and until their
successors are duly elected and qualified. Proxies cannot be voted for a greater
number of persons than the number of nominees named below. It is expected that
the nominees will be able to serve, but if they are unable to serve, the proxy
will be voted for a substitute nominee(s) designated by the Board of Directors.
The nominees for election as Class II directors and the incumbent Class I and
III directors are as follows:
 
         NOMINEES FOR ELECTION AS CLASS II DIRECTORS--TERMS EXPIRE 2002
 
<TABLE>
<CAPTION>
NAME                                        PRINCIPAL OCCUPATION                   AGE                POSITION
- ------------------------------  ---------------------------------------------      ---      ----------------------------
<S>                             <C>                                            <C>          <C>
Richard M. Rose, M.D. ........  Director, President and Chief Executive                49   Director, President, and
                                 Officer of CytoTherapeutics, Inc.                            Chief Executive Officer
Moses Goddard, M.D. ..........  Vice President, Chief Technical Officer--Cell          49   Director, Vice President,
                                 Encapsulation, CytoTherapeutics, Inc.                        Chief Technical
                                                                                              Officer--Cell
                                                                                              Encapsulation
</TABLE>
 
    Richard M. Rose, M.D. became President, Chief Executive Officer and a
director of the Company in September 1997. Since May 1996 Dr. Rose has been
President and Chief Executive Officer of StemCells, Inc., a biotechnology
company acquired by CytoTherapeutics in 1997. From 1995 until May 1996, Dr. Rose
was a Managing Director of MPM Capital Advisors LLC, a consulting and investment
banking group. From 1992 until 1995, Dr. Rose was Vice President, Drug
Development, Preclinical and Clinical Research and Chief Medical Officer of
Cytel Corporation, a biotechnology company.
 
    Moses Goddard, M.D. has served as a director of the Company since December
1998. Dr. Goddard is a co-inventor of CytoTherapeutics' cell encapsulation
technology and currently serves as Vice President and Chief Technical
Officer--Cell Encapsulation of the Company. Dr. Goddard is the head of the
Company's Cell Encapsulation business unit and has been employed by the Company
since 1993. In addition to his current role at CytoTherapeutics, he serves as
Associate Professor of Surgical Research at Brown University in Providence,
Rhode Island. Prior to Brown University, he was an instructor in the Department
of Surgery at the Berkshire Medical Center in Pittsfield, Massachusetts. Dr.
Goddard is certified by the National Board of Medical Examiners and the American
Board of Surgery. He received his M.D. from Brown University in 1979.
 
THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE FOR THE ELECTION OF THE
TWO NOMINEES DESCRIBED ABOVE
 
                                       3
<PAGE>
                 INCUMBENT CLASS I DIRECTORS--TERMS EXPIRE 2001
 
<TABLE>
<CAPTION>
NAME                                             PRINCIPAL OCCUPATION                    AGE             POSITION
- ---------------------------------  ------------------------------------------------      ---      ----------------------
<S>                                <C>                                               <C>          <C>
Mark J. Levin....................  Chairman of the Board and Chief Executive                 48   Director
                                    Officer of Millennium Pharmaceuticals, Inc.
John J. Schwartz, Ph.D...........  President, Quantum Strategies Management Company          65   Director, Chairman of
                                                                                                    the Board
Irving L. Weissman, M.D..........  Professor, Stanford University                            59   Director
</TABLE>
 
    Mark J. Levin, a founder of the Company, has served as a director since the
Company's inception. From inception until January 1990 and from May 1990 until
February 1991, Mr. Levin served as the Company's President and acting Chief
Executive Officer. From November 1991 until March 1992, he served as Chief
Executive Officer of Tularik, Inc., a biotechnology company. From August 1991
until August 1993, Mr. Levin was Chief Executive Officer and a director of
Focal, Inc., a biomedical company. Mr. Levin is currently the Chairman of the
Board and Chief Executive Officer of Millennium Pharmaceuticals, Inc., a
biotechnology company. Mr. Levin is also currently on the Board of Directors of
Focal, Inc. and Tularik, Inc.
 
    John J. Schwartz, Ph.D. was elected to the Board of Directors of the Company
in December 1998 and was elected Chairman of the Board at the same time. He is
the former President and Chief Executive Officer of SyStemix, Inc. Dr. Schwartz
is currently President of Quantum Strategies Management Company, a registered
investment advisor located in Atherton, California. Prior to his positions at
SyStemix, he served as Assistant Professor, Vice President and General Counsel
at Stanford University in California. Dr. Schwartz graduated from Harvard Law
School in 1958 and received his Ph.D. degree in physics from the University of
Rochester in 1966.
 
    Irving L. Weissman, M.D. was elected to the Board of Directors of the
Company in September 1997. Dr. Weissman is the Karel and Avice Beekhuis
Professor of Cancer Biology, Professor of Pathology and Professor of
Developmental Biology at Stanford University. Dr. Weissman is a cofounder, and
currently is a member of the Scientific Advisory Board, of SyStemix, Inc. He has
also served on the Scientific Advisory Boards of Amgen Inc., DNAX and T-Cell
Sciences, Inc., all of which are biotechnology companies. Dr. Weissman is a
member of the National Academy of Sciences and also serves as Chairman of the
Scientific Advisory Board of the Company.
 
                                       4
<PAGE>
                INCUMBENT CLASS III DIRECTORS--TERMS EXPIRE 2000
 
<TABLE>
<CAPTION>
NAME                                              PRINCIPAL OCCUPATION                   AGE             POSITION
- ------------------------------------  ---------------------------------------------      ---      ----------------------
<S>                                   <C>                                            <C>          <C>
Patrick Aebischer, M.D., Ph.D.......  Chairman of the Board of                               44   Director
                                       Modex Therapeutiques SA
Richard J. Ramsden..................  Private Investor                                       61   Director
</TABLE>
 
    Patrick Aebischer, M.D., Ph.D., a founding scientist of the Company, was
elected to the Board of Directors of the Company effective February 1, 1996. Dr.
Aebischer is the Chairman of the Board of Modex Therapeutiques SA, a Swiss
biotechnology company in which the Company has a minority interest. Dr.
Aebischer is the Director of the Gene Therapy Center at the Centre Hospitalier
Universitaire Vaudois ("CHUV") in Switzerland and has been Professor of Surgery
and Medical Director of the Surgical Research Division at CHUV since 1992. From
1988 to 1992, Dr. Aebischer was Associate Professor of Medical Research and
Chairman of the Department of Artificial Organs and Biomaterials at Brown
University. Dr. Aebischer is also Professor of Biomaterials (Research) at Brown
and Professor at the Swiss Polytechnical School.
 
    Richard J. Ramsden, a director since 1994, is a private investor; he
previously served as President and CEO of Kinship Capital Corporation, a private
investment enterprise from 1983 to 1994. Mr. Ramsden is a former Senior Vice
President and Chief Financial Officer of Brown University. Mr. Ramsden is a
director of the Student Loan Marketing Association. He served as Chairman of the
Board of the College Construction Loan Insurance Association from 1987 to 1995
and as director of Dryvit Systems, Inc., a building materials company, from 1990
to 1995.
 
                                       5
<PAGE>
              INFORMATION CONCERNING THE BOARD AND ITS COMMITTEES
 
    During 1998, the Board of Directors had two standing committees: the
Compensation and Stock Option Committee (the "Compensation Committee") and the
Audit Committee. In addition, at its meeting on December 19, 1998, the Board of
Directors created an Executive Committee. The Company's Compensation Committee
held 4 meetings during the fiscal year ended December 31, 1998 and was composed
of Messrs. Levin and Ramsden, and included Dr. Schwartz after his election to
the Board in December 1998. The Compensation Committee makes recommendations to
the Board and the Company's management concerning salaries in general,
determines executive compensation and approves incentive compensation for
Company employees and consultants. The Company's Audit Committee held one
meeting during the fiscal year ended December 31, 1998 and was composed of
Messrs. Ramsden and Levin until December 19, 1998 when the Audit Committee was
reconstituted for the coming year composed of Mr. Ramsden and Dr. Schwartz. The
Audit Committee reviews the results and scope of the audit and other services
provided by the Company's independent auditors. The Company's Executive
Committee was created effective as of December 19, 1998 and is composed Drs.
Schwartz, Rose and Weissman and Mr. Levin. The Executive Committee has the power
and authority to meet and act on behalf of the full Board in between meetings of
the Board, including the power to authorize the execution of agreements.
However, such Executive Committee does not have the authority to declare
dividends or to authorize the issuance of stock of the Company. The Executive
Committee did not meet during the fiscal year ended December 31, 1998. The
Company has no nominating committee.
 
    During the fiscal year ended December 31, 1998, each non-employee director
initially received a $10,000 retainer payable quarterly and received $1,000 for
each Board meeting attended ($500 for each telephonic meeting) and $500 for each
Committee meeting attended. Each director who is not an employee of the Company
had previously received an option to purchase 5,000 shares of Common Stock
exercisable at the fair market value of the Common Stock at the time of grant.
Upon reelection as a director, each such director is entitled to receive an
option to purchase an additional 5,000 shares of Common Stock exercisable at the
fair market value of the Common Stock at the time of re-election. All such
options vest equally over three years on each anniversary of the grant date. In
addition, such directors, for so long as they were Compensation Committee
members, or eligible to serve as committee members, received an annual grant of
an option to purchase 1,000 shares of Common Stock, exercisable at the fair
market value of the Common Stock at the time of grant; such options becoming
exercisable one year after the date of grant.
 
    After an examination of compensation for Board members of other comparable
companies and an examination of data in the Radford Biotechnology Compensation
and Benefits Survey, such compensation was modified commencing with the second
calendar quarter of 1998 such that non-employee directors (other than the
Chairman) received an annual retainer of $18,000 payable quarterly and received
$1,500 for each Board meeting attended ($500 for each telephonic meeting) and
$500 for each Committee meeting attended. Each director who is not an employee
of the Company is entitled to receive upon election or reelection, (or
contemporaneously with the approval of the revised compensation plan with
respect to those directors already serving) an option to purchase 20,000 shares
of the Company's Common Stock exercisable at the fair market value of the Common
Stock at the time of grant, such shares vesting in equal portions over three
years on each anniversary of the grant date. Directors are reimbursed for their
expenses in attending meetings of the Board of Directors and of committees of
the Board of Directors. Under a plan approved by the stockholders, but not yet
implemented, each non-employee director not receiving consulting compensation
from the Company will have the option to be paid, in lieu of the cash
 
                                       6
<PAGE>
fees payable for his service as a director, in shares of Common Stock having a
fair market value equal to the amount of such cash fees. Shares of Common Stock
issued to directors in lieu of cash payments for Board service shall be
nonforfeitable, and a director shall have all of the rights of a stockholder of
the Company with respect to such Common Stock.
 
    The Board of Directors of CytoTherapeutics held 11 meetings during the
fiscal year ended December 31, 1998. All of the directors attended at least 75%
of the meetings of the Board of Directors and of all committees on which they
served except for Dr. Aebischer.
 
                                       7
<PAGE>
                               EXECUTIVE OFFICERS
 
    The executive officer of the Company who is not also a director of the
Company is:
 
<TABLE>
<CAPTION>
NAME                                      AGE                          POSITION
- ------------------------------------      ---      -------------------------------------------------
<S>                                   <C>          <C>
Philip K. Yachmetz..................          42   Senior Vice President, Business Development,
                                                    General Counsel and Secretary; Acting Chief
                                                    Financial Officer and Treasurer
</TABLE>
 
    Philip K. Yachmetz, age 42, joined the Company as Senior Vice President,
Business Development, General Counsel and Secretary in June 1998. He was
appointed Acting Chief Financial Officer and Treasurer effective as of April 2,
1999. From April 1997 until June 1998, Mr. Yachmetz was a Principal and Managing
Director of Millennium Venture Management LLC a strategic business consulting
and acquisition advisory consulting group specializing in services to healthcare
and high technology companies. From October 1996 to April 1997 Mr. Yachmetz was
Director, Legal & Corporate Affairs and Secretary of PlayNet Technologies, Inc.
an Internet based entertainment company. From January 1989 to October 1996, Mr.
Yachmetz served as Senior Counsel of Hoffmann-La Roche Inc., the U.S. subsidiary
of the international pharmaceutical, diagnostics, chemicals and biotechnology
conglomerate F. Hoffmann-La Roche Ltd. of Basel, Switzerland. Previously, Mr.
Yachmetz was with Burmah LNG Shipping, Inc. and subsidiaries, the U.S.
subsidiary of Burmah Oil plc and was engaged in the private practice of law in
New York City. Mr. Yachmetz is admitted to practice law in New York and New
Jersey.
 
    All executive officers of the Company are elected annually and serve at the
discretion of the Board of Directors.
 
                                       8
<PAGE>
                               PROPOSAL NUMBER 2
          RATIFICATION OF SELECTION OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    The Company is asking the stockholders to ratify the selection of Ernst &
Young LLP as the Company's independent public accountants for the fiscal year
ending December 31, 1999. The affirmative vote of the holders of a majority of
the shares represented and voting at the Annual Meeting will be required to
ratify the selection of Ernst & Young LLP.
 
    In the event the stockholders fail to ratify the appointment, the Audit
Committee of the Board of Directors will consider it as a direction to select
other auditors for the subsequent year. Even if the selection is ratified, the
Board at its discretion may direct the appointment of a different independent
accounting firm at any time during the subsequent year if the Board determines
that such a change would be in the best interests of the Company and its
stockholders.
 
    A representative of Ernst & Young LLP is expected to attend the Annual
Meeting and is not expected to make a statement, but will be available to
respond to appropriate questions and may make a statement if such representative
desires to do so.
 
THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE FOR THE PROPOSAL TO
RATIFY THE SELECTION OF ERNST & YOUNG LLP AS THE COMPANY'S INDEPENDENT PUBLIC
ACCOUNTANTS FOR THE FISCAL YEAR ENDING DECEMBER 31, 1999
 
                                       9
<PAGE>
                         SHARE OWNERSHIP OF MANAGEMENT
 
    The following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock as of March 31, 1999 by (i) each person
known by the Company to be the beneficial owner of more than 5% of the Company's
outstanding Common Stock, (ii) each director and nominee for director, (iii)
each executive officer named in the Summary Compensation Table and (iv) all
executive officers and directors of the Company as a group. Except as otherwise
indicated, the Company believes that the beneficial owners of the Common Stock
listed below, based on information furnished by such owners, have sole
investment and voting power with respect to such shares, subject to community
property laws where applicable, and that there are no other affiliations among
the stockholders listed in the table.
 
<TABLE>
<CAPTION>
                                                                                 SHARES             PERCENTAGE
                                                                              BENEFICIALLY           OF CLASS
NAME OF BENEFICIAL OWNER                                                         OWNED*         BENEFICIALLY OWNED*
- -------------------------------------------------------------------------  ------------------  ---------------------
<S>                                                                        <C>                 <C>
Genentech, Inc...........................................................      1,163,599                  6.3%
  1 DNA Way
  South San Francisco, CA 94080
Patrick Aebischer, M.D., Ph.D............................................         54,583(1)                 **
Moses Goddard, M.D. .....................................................         57,319(1)                 **
Mark J. Levin............................................................        139,804(2)                 **
Richard J. Ramsden.......................................................         25,000(3)                 **
Richard M. Rose, M.D.....................................................        312,228(4)               1.7%
John J. Schwartz, Ph.D. .................................................        131,128(5)                 **
Irving Weissman, M.D.....................................................        365,783(6)               2.0%
Philip K. Yachmetz.......................................................         82,601(7)                 **
John McBride.............................................................         61,066(8)                 **
All directors and executive officers as a group (9 persons)..............      1,229,512(9)               6.7%
</TABLE>
 
- ------------------------
 
*   All numbers are based on information obtained by questionnaire or filings on
    Forms 13D or 13G received by the Company.
 
**  Less than one percent.
 
(1) Represents shares issuable upon exercise of stock options exercisable within
    60 days.
 
(2) Includes 13,000 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(3) Includes 13,000 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(4) Includes 68,750 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(5) Includes 131,128 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(6) Includes 33,106 shares issuable upon exercise of stock options exercisable
    within 60 days and 7,160 shares issuable upon exercise of warrants
    exercisable within 60 days. Includes a total of 50,791 shares owned by
    trusts for the benefit of Dr. Weissman's children as to which he disclaims
    beneficial ownership.
 
(7) Includes 63,000 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(8) Includes 57,733 shares issuable upon exercise of stock options exercisable
    within 60 days.
 
(9) Includes 540,134 shares exercisable upon exercise of stock options
    exercisable within 60 days.
 
                                       10
<PAGE>
                             EXECUTIVE COMPENSATION
 
    The following table sets forth the compensation paid by the Company to
persons serving as its Chief Executive Officer during the fiscal year ended
December 31, 1998, the three other most highly compensated executive officers
serving as executive officers at the end of such fiscal year, each of whom
earned more than $100,000 for the fiscal year ended December 31, 1998
(collectively, the "named executive officers").
 
                           SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>
                                                                                                      LONG-TERM COMPENSATION
                                                                                                    --------------------------
                                                                ANNUAL COMPENSATION                           AWARDS
                                                     -----------------------------------------      --------------------------
                                                                                    OTHER           RESTRICTED      SECURITIES
                  NAME AND                                                         ANNUAL             STOCK         UNDERLYING
             PRINCIPAL POSITION                YEAR  SALARY($)   BONUS($)      COMPENSATION($)      AWARDS($)       OPTIONS(#)
- ---------------------------------------------  ----  ---------   --------      ---------------      ----------      ----------
<S>                                            <C>   <C>         <C>           <C>                  <C>             <C>
Richard M. Rose, M.D.........................  1998    286,553         0                0                  0         150,000(1)
  Chief Executive Officer(3)                   1997     68,750         0                0                  0         300,000(4)
Philip K. Yachmetz...........................  1998    155,780    10,000                0                  0          75,000
  Senior Vice President and General Counsel
  Acting Chief Financial Officer and
  Treasurer(7)
Moses Goddard, M.D. .........................  1998    188,957         0                0                  0          67,875(8)
  Vice President, Chief Technical
  Officer--Cell Encapsulation
John McBride.................................  1998    221,366         0                0                  0         128,750(9)
  Executive Vice President and Chief           1997    108,885    16,334(11)            0                  0         145,000(12)
  Financial Officer
 
<CAPTION>
                                                     ALL
                  NAME AND                          OTHER
             PRINCIPAL POSITION                COMPENSATION($)
- ---------------------------------------------  ---------------
<S>                                            <C><C>
Richard M. Rose, M.D.........................      11,330(2)
  Chief Executive Officer(3)                       76,268(5)
Philip K. Yachmetz...........................      86,695(6)
  Senior Vice President and General Counsel
  Acting Chief Financial Officer and
  Treasurer(7)
Moses Goddard, M.D. .........................           0
  Vice President, Chief Technical
  Officer--Cell Encapsulation
John McBride.................................       8,798(10)
  Executive Vice President and Chief                2,256(13)
  Financial Officer
</TABLE>
 
- ------------------------
 
(1) Represents the regrant of an option in the original amount of 200,000 shares
    which was reduced to 150,000 shares as a result of the employee equity
    incentive repricing plan approved by the Board of Directors on July 10,
    1998.
 
(2) Represents the personal portion of the use of a Company vehicle, as well as
    $5,000 of fair market value of the Company matching contributions of Common
    Stock to Dr. Rose's account in the Company's 401(k) Plan.
 
(3) Dr. Rose became Chief Executive Officer on September 26, 1997.
 
(4) One option grant for 200,000 shares was reduced to 150,000 shares upon the
    repricing of the grant effective as of July 10, 1998 at a price of $1.281
    per share.
 
(5) Represents advance for relocation expenses of $75,000 and fair market value
    of $1,268 of Company matching contributions of Common Stock to Dr. Rose's
    account in the Company's 401(k) plan.
 
(6) Represents $71,971 of consulting compensation paid prior to employment of
    Mr. Yachmetz on June 8, 1998, $14,724 of temporary living expenses adjusted
    for taxes and personal use of a Company vehicle.
 
                                       11
<PAGE>
    Also represents $1,827 of fair market value of Company matching
    contributions of Common Stock to Mr. Yachmetz' account in the Company's
    401(k) Plan.
 
(7) Mr. Yachmetz was appointed Acting Chief Fincncial Officer and Treasurer
    effective as of April 2, 1999.
 
(8) Represents the regrant of options in the total original amount of 90,500
    shares which was reduced to 67,875 shares as a result of the employee equity
    incentive repricing plan approved by the Board of Directors on July 10,
    1998.
 
(9) Represents the regrant of two options in the total original amount of
    145,000 shares which was reduced to 108,750 shares as a result of the
    employee equity incentive repricing plan approved by the Board of Directors
    on July 10, 1998 and a promotional grant of options at a price of $2.813 per
    share. Mr. McBride resigned as Executive Vice President and Chief Financial
    Officer effective as of April 2, 1999.
 
(10) Represents the personal portion of the use of a Company vehicle, as well as
    $5,000 of fair market value of Company matching contributions of Common
    Stock to Mr. McBride's account in the Company's 401(k) Plan.
 
(11) Represents bonus earned in indicated year and paid in the following year.
 
(12) The original option grants for 130,000 and 15,000 shares were reduced to
    97,500 and 11,250 shares respectively upon the repricing of the grant
    effective as of July 10, 1998 at a price of $1.281 per share.
 
(13) Represents fair market value of the Company matching contributions of
    Common Stock to Mr. McBride's account in the Company's 401(k) plan.
 
                                       12
<PAGE>
                       OPTION GRANTS IN LAST FISCAL YEAR
 
    The following table provides information on option grants in 1998 to the
named executive officers.
 
<TABLE>
<CAPTION>
                                      NUMBER OF     PERCENT OF
                                     SECURITIES        TOTAL                                       POTENTIAL REALIZABLE VALUE
                                     UNDERLYING       OPTIONS                                      AT ASSUMED ANNUAL RATES OF
                                       OPTIONS      GRANTED TO                                    STOCK PRICE APPRECIATION FOR
                                       GRANTED     EMPLOYEES IN      EXERCISE                           OPTION TERM (3)
                                        (# OF         FISCAL           PRICE      EXPIRATION   ----------------------------------
NAME                                   SHARES)       YEAR (1)      ($/SHARE)(2)      DATE         0%($)       5%($)      10%($)
- -----------------------------------  -----------  ---------------  -------------  -----------  -----------  ---------  ----------
<S>                                  <C>          <C>              <C>            <C>          <C>          <C>        <C>
Richard M. Rose, M.D...............     150,000(4)         12.8%         1.281       9/22/07            0     120,842     306,238
Philip K. Yachmetz.................      75,000(5)          6.5%         1.281        9/8/00            0      60,421     153,119
Moses Goddard, M.D.................      11,250(6)          1.0%         1.281        5/5/08            0       9,063      22,968
John McBride.......................      20,000            1.7%          2.813        5/5/08            0      35,382      89,664
                                         97,500(7)          8.3%         1.281       5/27/07            0      78,547     199,054
                                         11,250(7)          1.0%         1.281       12/4/07            0       9,063      22,968
</TABLE>
 
- ------------------------
 
(1) The Company granted options covering 1,174,118 shares of Common Stock to
    employees in the fiscal year ended December 31, 1998. Of these options,
    403,750 shares were represented by original new option grants and 771,018
    shares were represented by regranted options issued as a result of the
    employee equity incentive repricing plan approved by the Board of Directors
    on July 10, 1998. Employees of the Company exchanged previously granted
    options for a total of 1,064,472 shares for the new repriced options.
 
(2) The exercise price may be paid by delivery of already-owned shares and tax
    withholding obligations related to exercise may be paid by offset of the
    underlying shares, subject to certain conditions.
 
(3) As suggested by the Commission's rules on executive compensation disclosure,
    the Company has presented option values based on arbitrary growth rates. The
    Company does not necessarily agree that the information presented properly
    values the options described.
 
(4) These options reflect the repricing and regrant of the original grant of
    200,000 options, the date of such repricing was July 10, 1998 at a price of
    $1.281 per share. Options for 6,250 shares vested on the date of grant; the
    remainder of such options vest subject to the achievement of certain
    milestones related to the Company's stem cells research program and in the
    event of certain changes of control.
 
(5) 30,000 options became exercisable on June 8, 1998 the date of grant with the
    remaining 45,000 shares vesting at a rate of 3,000 per month thereafter.
 
(6) These options reflect the repricing of an original part of 15,000 options
    granted on May 8, 1998 for promotion to Vice President. The date of such
    repricing was July 10, 1998 at a price of $1.281 per share.
 
(7) These options reflect the repricing and regrant of the original grants of
    130,000 and 15,000 options, the date of such repricing was July 10, 1998 at
    a price of $1.281 per share. The original became exercisable as to 25% of
    the shares covered after one year from the date of grant and as to of the
    shares covered by the option grant each month thereafter. Accordingly there
    was a pro-rata adjustment to the vested and unvested options covered by
    these repriced options.
 
                                       13
<PAGE>
           AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL
                             YEAR-END OPTION VALUES
 
    The following table provides information about option exercises in 1998 by
the named executive officers and the value of such officers' unexercised options
at December 31, 1998.
 
<TABLE>
<CAPTION>
                                                              NUMBER OF SECURITIES
                                                             UNDERLYING UNEXERCISED       VALUE OF UNEXERCISED
                                                                   OPTIONS AT            IN-THE-MONEY OPTIONS AT
                                                               FISCAL YEAR-END(1)         FISCAL YEAR-END($)(2)
NAME                                                       EXERCISABLE  UNEXERCISABLE  EXERCISABLE   UNEXERCISABLE
- ---------------------------------------------------------  -----------  -------------  ------------  -------------
<S>                                                        <C>          <C>            <C>           <C>
Richard M. Rose, M.D. ...................................      53,124        103,126      60,045.59    132,104.41
Philip K. Yachmetz.......................................      48,000         27,000      61,488.00     34,587.00
Moses Goddard, M.D. .....................................      52,436         20,939      63,885.02     26,822.86
John McBride.............................................      41,405         87,345      53,039.81     86,268.95
</TABLE>
 
- ------------------------
 
(1) December 31, 1998
 
(2) The closing price of the Company's Common Stock on December 31, 1998 on the
    NASDAQ National Market System was $1.469. The numbers shown reflect the
    value of options accumulated over all years of employment.
 
                                       14
<PAGE>
                      EMPLOYMENT AND SEVERANCE AGREEMENTS
 
    Under terms of an agreement dated December 19, 1998, Dr. Schwartz agreed to
serve as a Director and Chairman of the Board of Directors of the Company for a
term expiring at the 2001 Annual Meeting of Stockholders. Dr. Schwartz is
entitled to a retainer of $36,000 per year plus a fee of $1,500 for each Board
meeting or Committee meeting (if held at a date and time separate from the Board
meeting) physically attended and $500 for each Board meeting or Committee
meeting (if held at a date and time separate from the Board meeting) held by
conference call, payable quarterly in arrears. Dr. Schwartz is obligated to
spend no less than fifteen business days per calendar quarter devoted
collectively to the performance of his duties under this agreement and his
pre-existing Consulting Services agreement (SEE "CERTAIN RELATIONSHIPS AND
RELATED TRANSACTIONS" HEREIN). In the event Dr. Schwartz devotes more than
fifteen business days in any calendar quarter to the performance of his duties,
Dr. Schwartz is entitled to receive additional compensation at the rate of
$1,500 per day. The agreement provides for the grant to Dr. Schwartz of a stock
option covering 40,000 shares of Common Stock that vest in equal portions on the
last day of each of the 29 months of the term of the agreement. In the event Dr.
Schwartz ceases to be Chairman of the Board of Directors, either as a result of
an affirmative vote of the Board of Directors for reasons other than cause or
due to his disability or his resignation from such position, but remains a
Director, his cash compensation and remaining unvested time-based stock options
will be reduced to the then current rate for a Director of the Company. In the
event Dr. Schwartz ceases to be Chairman of the Board of Directors, either as a
result of an affirmative vote of the Board of Directors for reasons other than
cause or due to his disability or his resignation from such position, and then
he resigns as a Director or is removed as a Director pursuant to the Company's
By-laws, the Company shall have no further obligation to pay cash compensation
to Dr. Schwartz. Dr. Schwartz shall have one year from such date to exercise any
options vested as of that date and any unvested options shall lapse. In the
event Dr. Schwartz is removed from his positions as Director and Chairman of the
Board of Directors for cause, as defined in the agreement, the Company shall
have no further obligation to pay cash compensation to Dr. Schwartz, any
unvested options shall lapse and the exercise of any options vested shall be
governed by the terms of the Company's 1992 Equity Incentive Plan. The
termination of the agreement for any reason shall have no effect on the
Consulting Services agreement (SEE "CERTAIN RELATIONSHIPS AND RELATED
TRANSACTIONS" HEREIN).
 
    Under the terms of an agreement dated September 25, 1997, Dr. Rose agreed to
serve as President, Chief Executive Officer and a director of the Company. Dr.
Rose is entitled to an annual salary of $275,000 and a bonus of up to 25% of his
salary. The agreement provides for the grant to Dr. Rose of a stock option
covering 200,000 shares of Common Stock that vests as to one quarter of such
number of shares on the first anniversary of the date of grant and equally as to
the remaining shares over the next 36 months. This stock option was regranted in
July 1998 and reduced to 150,000 shares of Common Stock as a result of the
repricing of the stock option, with no change to the vesting schedule other than
a pro-rata reduction of the number of shares which vest on each date. In
addition, Dr. Rose, under the agreement, was granted a stock option covering
100,000 shares of the Company's Common Stock, which option vests upon the
achievement of certain milestones related to the Company's stem cells research
program. The vesting under both options will be accelerated in the event of
certain changes in control of the Company. The agreement provides for
reimbursement of certain moving costs up to $125,000 and for a bridge loan for
purchase of a home up to $200,000. The agreement also provides for certain
employee benefits and contains provisions regarding confidentiality and
noncompetition before and after employment. The Company may terminate Dr. Rose's
contract other than for cause by written notice to Dr. Rose, in which case the
Company has agreed to pay Dr. Rose the greater of (i) an additional year of
salary or (ii) two years salary if the termination results from a change of
control (as defined in the agreement) or (iii) salary payments until
 
                                       15
<PAGE>
September 25, 2000. The agreement also provides that in these cases, unvested
time-based options will vest. Similar provisions apply if Dr. Rose terminates
his employment for cause. Dr. Rose may terminate his employment for any reason
on three months' notice. The agreement also contains special provisions for
disability.
 
    Under the terms of an agreement dated April 17, 1997, Mr. McBride agreed to
serve as a Senior Vice President, Business Operations and Chief Financial
Officer of the Company. Mr. McBride was initially entitled to an annual salary
of $190,000 and a bonus of up to 15% of his salary. In May 1998, Mr. McBride was
promoted to the position of Executive Vice President--Business Operations and
Chief Financial Officer of the Company and his annual salary was increased to
$230,000. The agreement provides for a grant of a stock option to Mr. McBride
covering 130,000 shares of Common Stock that vests as to one quarter of such
shares on the first anniversary of the date of grant and equally as to the
remaining shares over the next 36 months. This stock option was regranted in
July 1998 and reduced to 97,500 shares of Common Stock as a result of the
repricing of the stock option, with no change to the vesting schedule except for
a pro-rata reduction of the number of shares which vest on each date. The
vesting under the option will be accelerated in the event of certain changes in
control of the Company occurring within two years of the agreement. The
agreement provides for reimbursement of certain costs of moving up to $10,000;
the agreement also provides for certain employee benefits and contains
provisions regarding confidentiality and noncompetition before and after
employment. The Company may terminate Mr. McBride's contract other than for
cause by written notice to Mr. McBride in which case the Company has agreed to
pay Mr. McBride up to nine months of severance pay offset by pay from another
job and potentially by profits available from option exercises; the agreement
also provides that in these cases, unvested options which would have vested
during the severance period will vest. If such termination results from a change
of control (as defined) within the first two years of employment, all the
options granted at employment will vest. Similar provisions apply if Mr. McBride
terminates his employment for cause. There are also special provisions for
disability. Mr. McBride resigned as Executive Vice President and Chief Financial
Officer effective as of April 2, 1999.
 
    Under the terms of an agreement dated as of June 8, 1998, Mr. Yachmetz
agreed to serve as Senior Vice President, Business Development, General Counsel
and Secretary of the Company for an initial period ending on September 7, 1999.
Mr. Yachmetz is entitled to an annual salary of $250,000 and a bonus in a
percentage amount of his salary similar to that for which other members of the
Company's senior management are eligible or are awarded, such bonus to also be
based on the achievement of specified milestones. The agreement also provides
for a "sign on" bonus of $15,000, one third of which was paid to Mr. Yachmetz in
registered shares of the Company's Common Stock in accordance with the
agreement. The agreement further provides for a grant of a stock option to Mr.
Yachmetz covering 75,000 shares of Common Stock that vests as to 30,000 shares
on the effective date of the agreement and 3,000 shares per month thereafter for
the ensuing 15 months. The vesting under the option will be accelerated in the
event of certain changes in control of the Company. The agreement provides for
the reimbursement of certain relocation costs and temporary housing. The
agreement provides for certain employee benefits and contains certain provisions
regarding confidentiality during and after employment. The Company may terminate
Mr. Yachmetz' contract other than for cause by written notice to Mr. Yachmetz,
in which case the Company has agreed to pay Mr. Yachmetz six months of severance
pay plus any accrued and unpaid bonus, and any unvested options which would have
vested during the severance period will vest immediately. Similar provisions
apply if the Company terminates Mr. Yachmetz' agreement due to his disability,
or if the Company and Mr. Yachmetz fail to renew the agreement upon its
expiration. Mr. Yachmetz was appointed Acting Chief Financial Officer and
Treasurer effective as of April 2, 1999.
 
                                       16
<PAGE>
    Mr. Goddard serves as Vice President, Chief Technical Officer--Cell
Encapsulation of the Company and head of the Company's Encapsulated Cell Therapy
business unit. The Company has no employment agreement with Mr. Goddard, who has
served as an at-will employee of the Company since 1993. Mr. Goddard has agreed
with the Company to resign as a director of the Company should he cease for any
reason to serve as head of the Company's Encapsulated Cell Therapy business
unit.
 
    In the case of certain terminations of employment with the Company other
than for cause, all officers are entitled to severance equal to a percentage of
annual base pay, adjusted for length of service with the Company. In addition,
in the event of certain changes of control of the Company, severance payments
payable to senior officers will be increased to an amount equal to annual salary
reduced by the amount of certain stock and option gains.
 
    NOTWITHSTANDING ANYTHING TO THE CONTRARY SET FORTH IN ANY OF THE COMPANY'S
PREVIOUS FILINGS UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES
EXCHANGE ACT OF 1934, AS AMENDED, THAT MIGHT INCORPORATE FUTURE FILINGS,
INCLUDING THIS PROXY STATEMENT, IN WHOLE OR IN PART, THE FOLLOWING REPORT AND
THE PERFORMANCE GRAPH ON PAGE 23 SHALL NOT BE INCORPORATED BY REFERENCE INTO ANY
SUCH FILINGS.
 
                                       17
<PAGE>
             REPORT OF THE COMPENSATION AND STOCK OPTION COMMITTEE
 
    The Company applies a consistent philosophy to compensation for all
employees, including executive officers. This philosophy is based on the premise
that the achievements of the Company result from the coordinated efforts of all
individuals working toward common objectives. The Company strives to achieve
those objectives through teamwork focused on meeting the expectations of the
Company's shareholders.
 
COMPENSATION PHILOSOPHY FOR EXECUTIVE OFFICERS
 
    The goals of the compensation program are to reward individual and team
performance and to encourage future performance by aligning compensation with
business objectives and performance and to enable the Company to attract, retain
and reward executive officers who contribute to the long-term success of the
Company. The Company's compensation program for executive officers is based on
four principles:
 
- -  The Company pays competitively.
 
The Company is committed to a compensation program that helps attract and retain
the best people in the industry. To ensure that its compensation is competitive,
the Company regularly compares its compensation levels with those companies it
considers comparable and sets its compensation parameters based on this review.
 
- -  The Company compensates its executive officers for performance.
 
Executive officers are rewarded based upon both corporate performance and
individual performance. Corporate performance is evaluated by reviewing the
extent to which strategic and business plan goals are met. Individual
performance is evaluated by reviewing organizational and management development
progress against set objectives and the degree to which teamwork and Company
values are fostered by the individual's actions.
 
In early stage biopharmaceutical companies, performance is best judged by
success in achievement of scientific and technical milestones, product
development progress (including progress toward and through clinical trials),
strategic human resources development, capitalization and financing goals, and
commercialization goals. These are the bases presently used by the Committee.
 
- -  The Company strives for fairness in the administration of pay.
 
The Company strives to achieve a balance of the compensation paid to a
particular individual and the compensation paid to other executive officers both
inside the Company and at comparable companies.
 
- -  The Company believes that all employees, including executive officers, should
understand and constructively participate in the performance evaluation process.
 
The reorganization and rationalization of the Company's operations during 1998
resulted in a reexamination of the then existing performance evaluation process
and the objectives and key goals previously established. At the direction of the
Compensation Committee, the Company's management undertook a process of
reviewing and modifying the performance evaluation process for all employees.
This evaluation
 
                                       18
<PAGE>
process has resulted in the implementation of a revised performance evaluation
process for all employees of the Company effective as of January 1, 1999. The
revised process of assessing performance is as follows:
 
1.  At the beginning of the performance cycle, the evaluating manager (who in
    the case of executive officers is the Chief Executive Officer) in
    conjunction with the employee sets objectives and key goals for the employee
    based upon Company goals previously established by senior management.
 
2.  The evaluating manager gives the employee ongoing feedback about the
    employee's performance against established goals.
 
3.  At the end of the performance cycle, the employee submits a summary of the
    employee's accomplishments against key goals and the manager reviews and
    evaluates this summary.
 
4.  The evaluating manager compares the evaluation results to the results of
    evaluations of peers within the Company.
 
5.  The Chief Executive Officer and the Human Resources Director (and absent
    such officer, the Chief Financial Officer) review results of all evaluations
    except that of the Chief Executive Officer. These evaluations are
    subsequently discussed between the evaluating manager and the employee.
 
6.  For executive officers, the results of the performance evaluation are
    discussed with the Compensation Committee, which reviews these results and
    approves (subject to their review) recommendations for compensation made by
    the Chief Executive Officer.
 
7.  Decisions on cash compensation and, where appropriate, stock options or
    other long-term incentive compensation are based on the employee's
    evaluation compared with the evaluations of all employees of the Company.
 
In the case of the evaluation of the Chief Executive Officer, the Compensation
Committee serves as the evaluating manager.
 
COMPENSATION VEHICLES
 
    The Company uses a simple total compensation program consisting of cash and
equity-based compensation. Having a compensation program that allows the Company
to successfully attract and retain executive officers permits it to enhance
shareholder value, motivate technological innovation and foster teamwork. The
vehicles used are:
 
CASH-BASED COMPENSATION
 
SALARY--The Company sets base salaries for executive officers by reviewing the
aggregate of base salary and bonus for individuals in competitive positions in
the market and adjusting such aggregate to reflect individual performance.
 
ANNUAL CASH BONUS--Executive officers and the Chief Executive Officer are
eligible to receive an annual cash bonus upon the attainment of predetermined
corporate objectives. The Committee approves these objectives at the beginning
of the year, and progress against them is reviewed at year-end to determine the
appropriate bonus payment. At full achievement of objectives, the Chief
Executive Officer is targeted to receive a bonus of 25% of his annual base
salary and the other executive officers to receive 15% of their respective
annual bases salaries. The amount actually paid in any one year may be more or
less than the targeted bonus based on over or under achievement of objectives.
 
                                       19
<PAGE>
EQUITY-BASED COMPENSATION
 
STOCK OPTION PROGRAM--The purpose of the Company's stock option program is to
provide additional incentives to executive officers to maximize shareholder
value. The Company believes strongly in the use of stock options because they
align employee interests directly with shareholder value. The option program
also utilizes vesting periods to encourage executive officers to remain with the
Company and to encourage long-term increases in Company stock value. The Company
grants stock options to all employees upon hiring and anticipates that it may
use stock options as a bonus vehicle in the future. A program of cash awards for
excellence in performance and attainment of goals is currently in place.
 
Although provided for under the Company incentive plans, the Company presently
does not use stock appreciation rights as a compensation vehicle.
 
EMPLOYEE EQUITY INCENTIVE REPRICING PLAN
 
    Due to the decline in the share price of the Company's common stock through
mid-1998, on July 10, 1998, the Compensation Committee and the Board of
Directors approved the Employee Equity Incentive Repricing Plan (the "Repricing
Plan"). Because the average strike price of then existing stock options granted
to employees was $8.00 per share, the Committee and Board determined that it was
in the best interests of the Company to approve such repricing plan in order to
reinvigorate and provide appropriate incentives to the employees of the Company.
The Repricing Plan provided each full-time employee as of August 3, 1998,
including members of senior management, the option, on a case-by-case basis, to
cancel his or her existing stock option(s) in exchange for the regrant of a new
stock option pursuant to the Company's 1992 Equity Incentive Plan (the "1992
Plan") based on a ratio of .75 to 1, with a strike price equal to the closing
bid price for the shares of the Company's common stock as quoted by the Nasdaq
Stock Market as of the close of the market on July 10, 1998, the date of
approval of the Repricing Plan. The Repricing Plan also provided that all such
regranted stock options shall be subject to the same vesting schedule as the
stock option cancelled with the attendant pro-rata reduction in the number of
shares subject to the pre-existing vesting schedule. However, all such regranted
stock options were subject to a six (6) month blackout period during which time
no vested options may be exercised. The reissued stock options are intended to
the extent permitted by the Plan to qualify as incentive stock options as
defined in Section 422A of the Internal Revenue Code (the "Code") and to be a
tax-free exchange. All such regranted options are subject to the other terms and
conditions set forth in the 1992 Plan, except as specifically modified by the
Repricing Plan. The Committee and the Board determined that in the spirit and
intent of the Repricing Plan, it was appropriate and also in the best interests
of the Company to include the senior management of the Company in the class of
employees eligible to participate in the Repricing Plan. There have been no
prior repricings or exchanges of options for executive officers of the Company
during the last 10 completed fiscal years.
 
                                       20
<PAGE>
                           10-YEAR OPTION REPRICINGS
<TABLE>
<CAPTION>
                                         NUMBER OF SECURITIES     MARKET PRICE OF      EXERCISE PRICE
                                          UNDERLYING OPTIONS       STOCK AT TIME         AT TIME OF
                                              REPRICED OR         OF REPRICING OR       REPRICING OR       NEW EXERCISE
NAME(A)                       DATE(B)        AMENDED(#)(C)        AMENDMENT($)(D)      AMENDMENT($)(E)      PRICE($)(F)
- --------------------------  -----------  ---------------------  -------------------  -------------------  ---------------
<S>                         <C>          <C>                    <C>                  <C>                  <C>
Richard M. Rose, M.D.          7/10/98           150,000             $   1.281                5.125          $   1.281
 
Moses Goddard, M.D.            7/10/98            30,000             $   1.281                9.875          $   1.281
                               7/10/98             7,500             $   1.281                4.375          $   1.281
                               7/10/98             3,750             $   1.281               12.250          $   1.281
                               7/10/98             5,625             $   1.281                9.125          $   1.281
                               7/10/98             7,500             $   1.281                5.125          $   1.281
                               7/10/98            11,250             $   1.281                2.813          $   1.281
 
John McBride                   7/10/98            97,500             $   1.281                5.625          $   1.281
                               7/10/98            11,250             $   1.281                5.125          $   1.281
 
<CAPTION>
                                LENGTH OF
                                ORIGINAL
                               OPTION TERM
                            REMAINING AT DATE
                             OF REPRICING OR
NAME(A)                       AMENDMENT(G)
- --------------------------  -----------------
<S>                         <C>
Richard M. Rose, M.D.       9 years, 2 months
Moses Goddard, M.D.         5 years, 8 months
                            6 years, 6 months
                            7 years, 5 months
                            8 years, 5 months
                            9 years, 5 months
                                 9 years, 10
                                      months
                                 8 years, 10
John McBride                          months
                            8 years, 4 months
</TABLE>
 
EVALUATION OF 1998 PERFORMANCE OF EXECUTIVE OFFICERS
 
    The Committee compares the base salaries of executive officers against the
current competitive pay practices of comparable biotechnology companies by
reviewing data in the Radford Biotechnology Compensation and Benefits Survey
(and other biotechnology survey data, both formal and informal, as it becomes
available). Through these means, the Committee determined that though salaries
in the industry were generally rising, and despite the achievement of several
significant goals, it would not provide for any raises for executive officers in
1998 because of the poor performance of the Company, including the poor
performance of the Company's stock price.
 
    The Committee has determined that several executive officers achieved a
number of goals important to the Company including the continuing advance in the
Company's clinical trial program, the re-negotiation of the Company's agreement
with Astra Pain AB resulting in an increased level of funding for the Company's
efforts in regard of the pain clinical trials, the reorganization and
rationalization of the Company's operations and the reduction of the Company's
burn rate. However, notwithstanding these achievements, the Committee felt that
the overall performance of the Company, particularly the poor performance of the
Company's stock price, made the award of discretionary bonuses to executive
officers inappropriate at this time.
 
COMPENSATION OF CHIEF EXECUTIVE OFFICER
 
    In determining the proper base salary for Dr. Rose, who has served as CEO
since September 1997, the Committee took into account that his $275,000 annual
salary ranked in approximately the 60(th) percentile of the industry average of
salaries for CEOs in similar size biotechnology companies. The Committee
determined that this salary was appropriate given his tenure at the Company and
taking into account the option package and other components of Dr. Rose's total
compensation package. The Committee decided not to award a bonus to Dr. Rose at
this time because of the Company's poor stock performance and the lack of
discretionary bonuses to any other executive officer.
 
                                         COMPENSATION AND STOCK OPTION COMMITTEE
                                                                   Mark J. Levin
                                                              Richard J. Ramsden
                                                                John J. Schwartz
 
                                       21
<PAGE>
                               PERFORMANCE GRAPH
 
NOTE: THE STOCK PRICE PERFORMANCE SHOWN ON THE GRAPH BELOW IS NOT NECESSARILY
INDICATIVE OF FUTURE STOCK PRICE PERFORMANCE.
 
  COMPARISON OF CUMULATIVE TOTAL RETURNS ON COMMON STOCK OF CYTOTHERAPEUTICS,
                                     INC.,
              THE AMEX BIOTECHNOLOGY STOCK INDEX AND S&P 500 INDEX
  FOR THE PERIOD FROM THE COMPANY'S INITIAL PUBLIC OFFERING UNTIL DECEMBER 31,
                                      1998
 
    The graph below compares the cumulative total returns on the Company's
Common Stock with the cumulative total returns of the Amex Biotechnology Stock
Index and the S&P 500 Index for the period from the Company's initial public
offering until December 31, 1998. (1)
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                                AMEX
 
<S>        <C>           <C>                  <C>
                               BIOTECHNOLOGY
                COMPANY          STOCK INDEX     S&P 500 INDEX
Dec '93         $100.00              $100.00           $100.00
Dec '94          $36.73               $70.88            $98.46
Dec '95         $139.80              $116.87           $132.05
Dec '96          $73.47              $124.86           $158.80
Dec '97          $32.65              $140.28           $208.05
Dec '98          $11.99              $159.90           $263.53
</TABLE>
 
- ------------------------
 
(1) Based on the closing price of CytoTherapeutics' Common Stock on the first
    day of trading on the NASDAQ National Market System. Cumulative total
    returns assume reinvestment of all dividends and a hypothetical investment
    of $100 on March 26, 1992.
<TABLE>
<CAPTION>
<S>                       <C>          <C>        <C>        <C>        <C>        <C>        <C>        <C>
                            MAR '92     DEC '92    DEC '93    DEC '94    DEC '95    DEC '96    DEC '97    DEC '98
 
<CAPTION>
<S>                       <C>          <C>        <C>        <C>        <C>        <C>        <C>        <C>
COMPANY                       100.00       79.49     125.64      46.15     175.64      92.31      41.03      11.99
S&P 500 INDEX                 100.00      110.41     121.53     119.88     160.48     192.99     252.84     263.53
AMEX BIOTECH STOCK INDEX      100.00       94.41      64.07      45.41      74.88      80.00      89.88     159.90
<CAPTION>
</TABLE>
 
                                       22
<PAGE>
          COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    The following non-employee directors served on the Compensation and Stock
Option Committee in 1998: Messrs. Levin and Ramsden, and, commencing on December
19, 1998, Dr. Schwartz. In 1989, 1990 and 1991 Mr. Levin was an executive
officer of the Company.
 
    The Company has entered into several consulting agreements with Levin &
Associates, a company in which Mr. Levin's wife is a principal, for recruiting
services rendered to the Company. During the fiscal year ended December 31,
1998, the Company made payments of approximately $125,000 under such agreements.
The Company believes the terms of these agreements are no less favorable to the
Company than could have been obtained from unaffiliated third parties.
 
    The Company entered in a Consulting Services Agreement with John J. Schwartz
on July 27, 1998, as amended December 19, 1998, for strategic business advice
and counseling services, including assistance in the negotiation and
consummation of strategic collaboration transactions specified by the Company
(SEE "CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS" HEREIN). Dr. Schwartz was
elected to the Board of Directors on December 19, 1998 and became a member of
the Compensation Committee on that date. During the fiscal year ended December
31, 1998, the Company made payments of approximately $75,000 under such
Agreement. The Company believes the terms of these agreement are no less
favorable to the Company than could have been obtained from unaffiliated third
parties.
 
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
    Dr. Schwartz, a member and Chairman of the Board of Directors, was retained
in July 1998 to serve as a consultant to the Company rendering strategic
business advice and counseling services, including assistance in the negotiation
and consummation of strategic collaboration transactions specified by the
Company. Pursuant to his Consulting Agreement, Dr. Schwartz receives $5,000 per
month for his services (totaling $25,000 for 1998) and has been granted an
option to purchase 76,000 shares of the Company's Common Stock at $1.281 per
share, the fair market value of the Company's Common Stock at the time the
option was granted. The Agreement also provides for Dr. Schwartz to receive a
grant of a second option to purchase 48,000 shares of Common Stock at the then
current fair market value of the Company's Common Stock on July 27, 1999. The
initial option grant shall vest at a rate of 3,167 shares per month for the
ensuing 23 months after the date of the grant, with a final vesting of 3,159
shares in the 24(th) month. The second grant, when granted, shall vest at a rate
of 2,000 shares per month. In addition, to compensate Dr. Schwartz for services
rendered to the Company during the period of September 1997 through July 1998,
the Agreement provided for the payment to Dr. Schwartz of $50,000 and the grant
of a fully-vested option to purchase 20,000 shares of the Company's Common Stock
at $1.281, the fair market value of the Company's Common Stock at the time of
the grant. In the event Dr. Schwartz materially participates in the negotiation
and consummation of a strategic collaboration transaction specified by the
Company, he may be entitled to receive additional compensation equal to three
percent of the transaction consideration (as defined) when it is actually
received by the Company, such additional compensation payable half in cash and
half in the form of an option or warrant to purchase shares of the Company's
Common Stock at $0.20 per share, the number of shares being calculated based on
the fair market value of the Company's Common Stock ten days prior to the first
public announcement of the consummation of, the execution of a letter of intent
for or the existence of discussions concerning the collaboration transaction.
The payment of this additional compensation may be accelerated in the event
there is a change of control (as defined in the agreement) of the Company.
Effective as of December 19, 1998, Dr. Schwartz was compensated as a
 
                                       23
<PAGE>
director and Chairman of the Board of Directors in accordance with the terms of
an Agreement entered into on such date (SEE "EMPLOYMENT AND SEVERANCE
AGREEMENTS" ABOVE).
 
    Dr. Weissman, a member of the Board of Directors, was retained in September
1997 to serve as a consultant to the Company. Pursuant to his Consulting
Agreement, Dr. Weissman has agreed to provide consulting services to the Company
and serve on the Company's Scientific Advisory Board. The Company agreed to pay
Dr. Weissman $50,000 per year for his services and granted him an option to
purchase 500,000 shares of Common Stock for $5.25 per share, of which 31,250
shares vested at the date of grant and the remainder of which will vest upon the
occurrence of certain milestones related to the Company's stem cells research
program and in the event of certain changes of control. The Company also agreed
to nominate Dr. Weissman for a position on the Board of Directors. The
Consulting Agreement contains confidentiality, noncompetition and assignment of
invention provisions and is for a term of ten years, subject to earlier
termination by the Company for cause or frustration of purpose and earlier
termination by Dr. Weissman for good reason. Dr. Weissman receives no
compensation as a member of the Board of Directors or for attending meetings of
the Board or its committees or meetings of the Company's Scientific Advisory
Board, but is reimbursed for reasonable expenses he incurs in attending such
meetings.
 
    Dr. Aebischer, a founding scientist of the Company, serves as a member of
the Board of Directors and is party to a Research and Commercialization
Agreement providing for sponsorship by the Company of research by Dr. Aebischer
in return for certain rights in the results thereunder. The Company has granted
Dr. Aebischer stock options covering an aggregate of 80,000 shares at an average
weighted exercise price of $4.63 per share in addition to a restricted stock
grant covering 5,000 shares. Dr. Aebischer receives no compensation as a member
of the Board of Directors or for attending meetings of the Board or its
committees or meeting of the Company's Scientific Advisory Board.
 
    During 1996, Dr. Aebischer was one of four scientific founders of Modex
Therapeutiques SA ("Modex"). Dr. Aebischer was paid 18,260 SF (approximately
$14,580) by the Company for his services in connection with the formation of
Modex. Dr. Aebischer, the three other scientific founders, the Company and a
Swiss investment bank formed Modex by investing a total of SFr 140,000
(approximately $177,000) to acquire 14,000 shares of Modex Common Stock at SFr
10 (approximately $8.33) per share. Of such 14,000 shares, the Company acquired
6,500 shares, the Swiss bank 500 shares and the scientific founders 7,000
shares, of which Dr. Aebischer acquired 1,826 shares. After giving effect to
certain additional investments by the Company and the Swiss bank shortly after
founding, the Company owned 10,000 shares (or 50%) of Modex Common Stock, the
founding scientists 7,000 shares (or 35%) (of which Dr. Aebischer owned 1,852
shares or 9.26%) and the Swiss bank 3,000 shares (or 15%).
 
    As a condition to making such additional investments in Modex, the Company
entered into an Option Agreement with Dr. Aebischer and the other three
scientific founders, providing the Company and each scientific founder with the
right to exchange any or all of each scientific founder's shares in Modex at any
time for shares of the Company's Common Stock at a conversion ratio of 13.145
shares of the Company's Common Stock for each share of Modex Common Stock
(subject to the normal adjustments for stock splits, stock dividends, and the
like). On conversion of all of his 1,826 shares of Modex Common Stock, Dr.
Aebischer would have received 24,002 shares of the Company's Common Stock. In
addition, under the Option Agreement, the Company had the right to acquire from
Dr. Aebischer and the other founding scientists 1,522 shares of the Common Stock
of Modex initially acquired by them at the time Modex was founded at SFr 10 per
share, if at any time prior to July 1998, any such scientific founder (including
Dr. Aebischer) was terminated as a consultant for Modex for cause or resigned as
such a consultant without good reason.
 
                                       24
<PAGE>
    Under the terms of the Company's Cross License Agreement with Modex as
originally entered into in 1996, Modex had the right to receive up to 300,000
shares of the Company's Common Stock (the "Milestone Shares") on the achievement
of certain scientific milestones. Modex expected to use such Milestone Shares to
provide incentive compensation to its key employees and consultants. Under the
terms of his consulting agreement with Modex, Dr. Aebischer received cash
compensation at the rate of SFr 12,000 (approximately $8200) per year for 1996
(amounting to an aggregate of SFr 3000 during 1996) and had the right to receive
from Modex up to 54,780 shares of such Milestone Shares upon the achievement of
the specified scientific milestones.
 
    In October 1997, the Company completed a series of transactions which
reduced its ownership interest in Modex from 50% to approximately 25% in
exchange for $4 million cash from an investor group and elimination by Modex of
the Company's prior contingent obligation to contribute an additional Sfr
2,400,000 (approximately $1,600,000) to Modex in July 1998. In the transactions,
the Option Agreement between the Company and Dr. Aebischer was canceled, along
with all other put and call arrangements between the Company and the other
stockholders of Modex, and the Company forgave approximately $500,000 in
intercompany receivables due from Modex to the Company. The Company and Modex
also modified the terms of their existing Cross License Agreement to (i) expand
the field in which Modex is exclusively licensed to apply the Company's
proprietary encapsulated cell technology to include, in addition to the original
field of diabetes, obesity, and anemia, (x) the treatment of hemophilia A and B
utilizing Factor VIII and/or Factor IX and (y) two additional applications to be
agreed to by the Company and Modex; (ii) eliminate Modex's right to receive any
Milestone Shares; (iii) limit the scope of the Company's technology licensed to
Modex to existing and future encapsulation technology and certain additional
existing technology; and (iv) specify the terms under which the Company will
manufacture any products Modex may develop based on the Company's technology and
grant Modex an option to manufacture or have manufactured such products on
payment of a higher royalty. The Cross License Agreement continues to provide
for the payment of royalties from Modex to the Company on the sale of any
licensed products. The revised agreement similarly limits the scope of the Modex
technology exclusively licensed, on a royalty-bearing basis, to the Company for
application to diseases, conditions and disorders of the central nervous system
to existing and future encapsulation technology and certain additional existing
technology. In addition to their purchase of Modex Common Stock from the
Company, the venture capital investors participating in the transaction invested
$1.6 million directly in Modex. In connection with the transaction, Dr.
Aebischer and the other scientific founders transferred 2,000 shares of their
Modex stock to the Company (of which Dr. Aebischer transferred 522 shares) for
nominal consideration (Sfr 10 per share) and waived their right to receive any
Milestone Shares under their consulting agreements with Modex.
 
    Dr. Aebischer is the principal investigator under the Research and
Commercialization Agreement between the Company and CHUV (the "CTI-CHUV
Agreement") and Modex and CHUV (the "Modex-CHUV Agreement"). The Company
provided research funding under the CTI-CHUV Agreement during 1998 in the total
amount of $320,000.
 
                                       25
<PAGE>
                               OTHER INFORMATION
 
ACCOUNTING MATTERS
 
    The Board of Directors has selected the independent accounting firm of Ernst
& Young LLP to audit the accounts of the Company for the year ending December
31, 1999.
 
    A representative of Ernst & Young LLP who audited the accounts of the
Company for the year ended December 31, 1998 is expected to be present at the
Annual Meeting of Stockholders and will be afforded the opportunity to make a
statement if he or she desires to do so and is expected to be available to reply
to appropriate stockholder inquiries.
 
STOCKHOLDER PROPOSALS
 
    Proposals of Stockholders submitted for consideration at the next Annual
Meeting of Stockholders must be received by the Company (attention: Secretary)
no later than December 7, 1999.
 
FORM 10-K
 
    THE COMPANY'S ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER
31, 1998 (WITHOUT EXHIBITS), AS FILED WITH THE SECURITIES AND EXCHANGE
COMMISSION, IS AVAILABLE WITHOUT CHARGE UPON REQUEST BY WRITING TO THE COMPANY
AT 701 GEORGE WASHINGTON HIGHWAY, LINCOLN, RHODE ISLAND 02865, ATTN: INVESTOR
RELATIONS.
 
SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
    Section 16(a) of the Exchange Act requires the Company's officers and
directors, and persons who own more than ten percent of a registered class of
the Company's Common Stock, to file reports of ownership and changes in
ownership on Forms 3, 4 and 5 with the Securities and Exchange Commission
("SEC"). Officers, directors and greater than ten percent stockholders are
required by SEC regulations to furnish to the Company copies of all Forms 3, 4
and 5 they file. Based solely on the Company's review of copies of such forms it
has received, the Company believes that all of its officers, directors and
greater than ten percent beneficial owners complied on a timely basis with all
filing requirements applicable to them.
 
OTHER BUSINESS
 
    The Board of Directors knows of no business that will come before the
meeting for action except as described in the accompanying Notice of Meeting.
However, as to any such business, the persons designated as proxies will have
discretionary authority to act in their best judgment.
 
                                          By Order of the Board of Directors
 
                                          Philip K. Yachmetz
                                          SECRETARY
 
April 7, 1999
 
                                       26
<PAGE>

                                  DETACH HERE

                                     PROXY

                             CYTOTHERAPEUTICS, INC.

                  ANNUAL MEETING OF STOCKHOLDERS, MAY 11, 1999

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned stockholder, by completing this card, hereby appoints 
Richard M. Rose, M.D. and Philip K. Yachmetz, or either of them with power of 
substitution to each, proxies of the undersigned to vote at the Annual 
Meeting of Stockholders of CytoTherapeutics, Inc. to be held on May 11, 1999 
at the offices of CytoTherapeutics, Inc., 701 George Washington Highway, 
Lincoln, Rhode Island at 1:00 p.m., local time, or at any adjournments 
thereof, all of the shares of Common Stock, par value $.01 per share, of 
CytoTherapeutics, Inc. that the undersigned would be entitled to vote if 
personally presented. The undersigned instructs such proxies or their 
substitutes to act on the following matter as specified by the undersigned, 
and to vote in such manner as they may determine on any other matter that may 
properly come before the meeting.

- -------------                                              -------------
/SEE REVERSE/                                              /SEE REVERSE/
/   SIDE    /  CONTINUED AND TO BE SIGNED ON REVERSE SIDE  /   SIDE    /
- -------------                                              -------------

<PAGE>

<TABLE>
<S>                                                              <C>
- -------------------                                              ------------------
/VOTE BY TELEPHONE/                                              /VOTE BY INTERNET/
- -------------------                                              ------------------

It's fast, convenient, and immediate!                            It's fast, convenient, and your vote is immediately
Call toll-free on a touch tone phone                             confirmed and posted.
1-877-PRX-VOTE (1-877-779-9583)
- -----------------------------------------------------------      -----------------------------------------------------------
Follow these four easy steps:                                    Follow these four easy steps:

1. Read the accompanying Proxy Statement and Proxy Card.         1. Read the accompanying Proxy Statement and Proxy Card.

2. Call the toll-free number 1-877-PRX-VOTE                      2. Go to the Website http://www.eproxyvote.com/ctii.
   (1-877-779-8683). For shareholders residing outside the
   United States, call collect on a touch-tone phone             3. Enter your 14-digit Voter Control Number located on your
   1-201-536-8073.                                                  Proxy Card above your name.

3. Enter your 14-digit Voter Control Number located on           4. Follow the instructions provided.
   your Proxy Card above your name.

4. Follow the recorded instructions.


- -----------------------------------------------------------      -----------------------------------------------------------
YOUR VOTE IS IMPORTANT!                                          YOUR VOTE IS IMPORTANT!
Call 1-677-PRX-VOTE anytime!                                     Go to http://www.eproxyvote.com/ctii anytime!
</TABLE>

   DO NOT RETURN YOUR PROXY CARD IF YOU ARE VOTING BY TELEPHONE OR INTERNET


                                  DETACH HERE

- -------  PLEASE MARK
/  X  /  VOTES AS IN
- -------  THIS EXAMPLE.

This proxy when properly executed will be voted in the manner specified by 
the undersigned stockholder(s). If no contrary direction is made, this proxy 
will be voted FOR the election of the nominees for director named below, FOR 
the ratification of the selection of public accountants, and in the 
discretion of the named proxies as to any other matter that may come before 
the meeting.


<TABLE>
<S>                                                                  <C>
1. To elect the following nominees as Class II directors.            2. To ratify the selection of Ernst   FOR   AGAINST   ABSTAIN
                                                                        & Young as independent public       --      --        --
   Nominees: (01) Richard M. Rose, M.D. and (02) Moses Goddard, M.D.    accountants of CytoTherapeutics    /  /    /  /      /  /
                                                                        Inc. for fiscal year ending         --      --        --
              -----                 -----                               December 31, 1999:
    FOR      /    /                /    / WITHHELD
    ALL      -----                 -----  FROM ALL                   3. By my signature below, I confer to the named proxies
 NOMINEES                                 NOMINEES                      discretionary authority to vote upon such other business
                                                                        as may properly come before the meeting or any 
                                                                        continuations and adjournments thereof.
    ----- 
   /    /                                                            THE BOARD OF DIRECTORS OF CYTOTHERAPEUTICS, INC.
   -----  ______________________________________                     RECOMMENDS A VOTE FOR THE NOMINEES FOR DIRECTOR
          For all nominees except as noted above                     LISTED TO THE LEFT AND A VOTE FOR RATIFICATION OF
                                                                     THE SELECTION OF INDEPENDENT PUBLIC ACCOUNTANTS.
                                                                                                                     ----
                                                                     MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT  /   /
                                                                                                                    ----

                                                                     Note: Please sign exactly as name appears on this card. As 
                                                                     joint owners should sign. When signing as an executor, 
                                                                     administrator, attorney, or guaradian of a minor, please 
                                                                     give full title as such. If a corporation, please sign in 
                                                                     full corporate name and indicate the signer's title. If a 
                                                                     partner, sign in partnership name.


Signature: ______________________________ Date: _______________ Signature: ______________________________ Date: _______________
</TABLE>




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