CYTOTHERAPEUTICS INC/DE
10-K405, 1999-03-31
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                   FORM 10-K
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
  /X/    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998
                                       OR
 
  / /    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934
 
                         COMMISSION FILE NUMBER 0-19871
                            ------------------------
 
                             CYTOTHERAPEUTICS, INC.
 
             (Exact name of Registrant as specified in its charter)
 
                  DELAWARE                             94-3078125
        (State or other jurisdiction         (I.R.S. Employer Identification
     of incorporation or organization)                    No.)
 
                701 GEORGE WASHINGTON HIGHWAY, LINCOLN, RI 02865
              (Address of principal executive offices) (zip code)
 
       Registrant's telephone number, including area code: (401) 288-1000
 
          Securities registered pursuant to Section 12(b) of the Act:
                                      NONE
 
          Securities registered pursuant to Section 12(g) of the Act:
 
                          COMMON STOCK, $.01 PAR VALUE
                     JUNIOR PREFERRED STOCK PURCHASE RIGHTS
                            ------------------------
 
                                 Title of class
 
    Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes /x/  No / /
 
    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  /x/
 
    Aggregate market value of Common Stock held by non-affiliates at March 31,
1999: $21,819,231. Inclusion of shares held beneficially by any person should
not be construed to indicate that such person possesses the power, direct or
indirect, to direct or cause the direction of management policies of the
registrant, or that such person is controlled by or under common control with
the Registrant. Common stock outstanding at March 31, 1999: 18,374,089 shares.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
    Portions of the Registrant's Definitive Proxy Statement for its 1999 Annual
Meeting of Shareholders are incorporated by reference into Part III of this
Report.
 
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                           FORWARD LOOKING STATEMENTS
 
    This report contains certain forward-looking statements regarding, among
other things, the Company's expected results of operations, the progress of the
Company's collaborations, product development and clinical programs, the need
for, and timing of, additional capital and capital expenditures, collaboration
prospects, costs of manufacture of products, the protection of and the need for
additional intellectual property rights, regulatory matters, the need for
additional facilities and potential market opportunities. The Company's actual
results may vary materially from those contained in such forward-looking
statements because of risks to which the Company is subject such as risks of
delays in research, adverse results from the Company's development or clinical
testing programs, obsolescence of the Company's technology, lack of available
funding, competition from third parties, termination of the Company's
collaborations, intellectual property rights of third parties, unavailability of
needed raw materials, failure of the Company or its collaborators to perform,
litigation, regulatory restrictions, and other risks to which the Company is
subject.
 
    SEE "CAUTIONARY FACTORS RELEVANT TO FORWARD-LOOKING INFORMATION" FILED
HEREWITH AS EXHIBIT 99 AND INCORPORATED HEREIN BY REFERENCE.
<PAGE>
ITEM 1.
 
                                    BUSINESS
 
THE COMPANY
 
    CytoTherapeutics, Inc. ("CytoTherapeutics" or the "Company") is a leader in
the development of novel cell therapies designed to treat human diseases. The
Company is developing products based on two principal technologies: stem cell
therapies and encapsulated cell therapies. The Company's stem cell therapies are
based on the transplantation of human stem cells to replace or repair damaged or
defective cells; the Company's encapsulated cell therapies are based upon the
use of living cells encapsulated in the Company's proprietary membranes and
inserted into specific sites in the body. The Company believes that it has
achieved a leadership position in the neural stem cell area with its research
and development program for neural stem/progenitor cells. The Company has also
established a research program to discover the stem cells of the pancreas and of
the liver, and has established a broad intellectual property position with
respect to stem/progenitor cell therapies through its own patented discoveries
and exclusive licensing arrangements. The Company is currently developing an
encapsulated cell product for the treatment of chronic pain, with additional
research efforts directed to other disorders including, but not limited to,
ophthalmic diseases and disorders. The Company currently has one product
candidate in clinical trials: its encapsulated cell implant to treat chronic
pain.
 
    CytoTherapeutics, Inc. was incorporated in Delaware in 1988 and currently
has one subsidiary, StemCells, Inc., a California corporation acquired by the
Company in September 1997.
 
    THE UNMET NEED
 
    Many diseases result from organ failure where organs cannot be transplanted
to cure the disease (e.g., neurodegenerative diseases and pancreatic failure) or
where there are constraints due to a short supply of organs for transplant. The
Company believes its stem cell technologies may provide the basis for replacing
certain lost or damaged cells or regenerating organs damaged by disease.
Furthermore, biotechnology has discovered or created a number of new and
promising proteins, but the lack of an effective way to deliver these proteins
locally has limited their widespread use. The Company believes its
encapsulated-cell therapies may provide a platform for effective local delivery
of these and other proteins to treat diseases. If the Company can successfully
develop either or both of its cell therapy technologies, it believes that its
technologies may provide the basis for addressing a number of diseases with
significant unmet medical needs.
 
                            CELL THERAPY BACKGROUND
 
    ROLE OF CELLS IN HUMAN HEALTH AND TRADITIONAL THERAPIES
 
    In healthy individuals, cells maintain normal physiological function by
secreting or metabolizing substances, such as sugars, amino acids,
neurotransmitters and hormones, which are essential to life. When cells are
damaged or destroyed, they no longer produce, metabolize or accurately regulate
critical molecular substances required by the body. For example, the progressive
decline common to many neurodegenerative diseases, such as Parkinson's disease
and amyotrophic lateral sclerosis ("ALS"), is associated with impaired cellular
function.
 
    Recent advances in biotechnology have led to the discovery of a number of
specific proteins that are, in certain diseases or disorders, inadequately
produced by the body's own cells. While these proteins overcome some of the
limitations of traditional pharmaceuticals, such as lack of specificity, they do
not reproduce the natural ability of cells to secrete such substances at the
precise sites of action and in the appropriate physiological quantities or for
the duration required. As a result, investigators have considered
 
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using cell therapy to replace vital cells which are failing by implanting cells
which carry the ability to provide a needed critical molecule or by implanting
cells to replace those which have failed. In situations of irreversible failure
of vital cells, transplantation of cells offers the possibility of replacing the
functions of these failed cells, thus potentially restoring health.
 
    THE POTENTIAL OF CELL-BASED THERAPY
 
    Cell-based therapy, the use of cells to treat diseases, has the potential to
provide a broad therapeutic approach of comparable importance to traditional
pharmaceuticals and, more recently, to genetically engineered biologics.
However, autologous cells (cells from the individual into whom they are to be
transplanted) are available in limited supply, may be abnormal if the patient is
ill and often can only be obtained through significant surgical procedures.
Allogeneic (same species) cellular transplants and xenogeneic (cross-species)
cellular transplants generally require the use of potent immunosuppressive
drugs. These drugs broadly compromise the patient's immune system in order to
decrease the likelihood of rejection of the transplanted cells and expose the
transplant recipient to adverse side-effect(s), such as increased risk of
infection or cancer. CytoTherapeutics believes its stem cell technologies may
provide a way to replace specific cells that have been damaged or destroyed.
This approach may be necessary when cell replacement requires repair of cellular
architecture or direct cell-to-cell contact. Such replacement with stem cells,
which may grow and differentiate to produce differentiated progeny (i.e.,
mature, lineage-restricted cells), may allow for the restoration of function
through the replacement of normal cells where this has not been possible in the
past. CytoTherapeutics also believes its encapsulation technologies may reduce
or eliminate the need for immunosuppression, as well as allow site-specific
delivery and relative control of cell output.
 
                   CYTOTHERAPEUTICS' PORTFOLIO TECHNOLOGIES:
             STEM CELL TECHNOLOGY AND ENCAPSULATED CELL TECHNOLOGY
 
STEM CELL TECHNOLOGY
 
    Stem cells may be functionally characterized as cells whose progeny include
both daughter stem cells (by self-renewal) as well as more differentiated cells.
Stem cells exist in humans as a self-renewing source of cells needed in the
various systems of the body (e.g., hematopoietic, neural and neural crest,
hepatic, pancreatic endocrine cells, and mesenchymal stem cells). These rare,
self-renewing stem cells are present in many tissues and are responsible for
organ regeneration after injury or during normal cell replacement. The Company
believes that these cells can form the basis of therapies that have the
potential to replace specific subsets of cells that have been injured or lost
through disease, injury or genetic defect.
 
    The Company is seeking to identify, isolate and find methods of expanding a
variety of different human stem cell cultures for use in treatment of a variety
of human diseases and disorders. The Company believes that there are a finite
number of stem cells in the human system and that it is possible for the person
or entity that first identifies and isolates a given stem cell culture to obtain
patent protection for such cells. The Company's strategy is to be the first to
identify, isolate and patent multiple types of human stem/progenitor cell
cultures with commercial importance.
 
    Neurodegenerative diseases such as Parkinson's disease, epilepsy and
Alzheimer's disease affect a significant portion of the U.S. population and
currently have no effective long-term therapies. The Company believes that its
neural stem/progenitor cells may be useful in treating such diseases. The
Company is continuing research into, and has initiated the development of, its
human neural stem/ progenitor cell-based therapies.
 
    The Company has advanced its research programs to discover the human
pancreatic stem cell and the liver stem cell. Pancreatic stem cells may be
useful in the treatment of Type 1 diabetes and other diseases characterized by
loss of pancreatic function. Liver stem cells may be useful in the treatment of
diseases such as hepatitis, cirrhosis of the liver and liver cancer.
 
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    There can be no assurance that the Company will successfully develop its
stem cell therapies. Even in the event that such therapies are successfully
developed, there can be no assurances that they will achieve the benefits
described above, that these therapies will achieve benefits therapeutically
equal to or better than the standard of treatment at time of testing, or that
the advantages of such technology will be greater than the potential
disadvantages.
 
ADVANTAGES OF THE COMPANY'S STEM CELL TECHNOLOGY
 
    NO OTHER TREATMENT
 
    To the best of the knowledge of the Company, no one has developed an
approved method for replacing lost or damaged tissues from the human nervous
system. Replacement of tissues in other areas of the human body is limited to
those few areas where autologous transplantation is now feasible. In a few
additional areas, allogeneic transplantation is now used, but is limited by the
scarcity of organs available through donation. The Company believes that its
stem cell technologies have the potential to reestablish function in at least
some of the patients who have suffered the losses referred to above.
 
    NATURE OF REPLACEMENT CELLS
 
    The Company believes that stem cells can self-renew and differentiate into
the multiple kinds of cells that are commonly lost in, for example,
neurodegenerative diseases. Transplantation of these stem cells may allow these
cells to migrate limited distances to the proper location within the body, to
expand and differentiate and to replace damaged or defective cells. If the
Company can show that the foregoing process occurs, after transplantation the
cells that are substituted could form new cells that could facilitate the return
to proper function. The Company believes that such replacement of damaged or
defective cells by functional cells is unlikely to be achieved with any other
treatment.
 
ENCAPSULATED CELL TECHNOLOGY
 
    Encapsulated cell therapies represent a potentially broadly applicable
delivery platform for treating a number of diseases that are currently
untreatable or poorly treated with present technologies. The Company is
employing its proprietary encapsulation techniques to develop semipermeable
polymer implants containing living cells that are designed to be placed into
selected sites in the body to treat specific diseases or conditions. The
implants are also designed to allow nutrients to reach the encapsulated cells
and to allow wastes and the therapeutic protein(s) to pass out of the implant
while protecting the cells from elements of the patient's immune system.
 
    The Company's implants are designed to be biocompatible, remaining in
contact with the recipient's tissues without generating a response that would
significantly inhibit the functioning of the encapsulated cells or cause
significant injury to host tissues. When such biocompatibility is achieved, the
membrane can selectively permit nutrients and oxygen to pass from the recipient
through the membrane into the implant, nourishing the cells and allowing them to
function. Similarly, such biocompatibility, together with the permeability of
the membrane, enables the substances produced by the encapsulated cells to pass
through the membrane and produce the desired therapeutic effect.
 
ADVANTAGES OF THE COMPANY'S ENCAPSULATED CELL TECHNOLOGY
 
    Many diseases have no satisfactory treatment today, in certain cases,
because therapeutic substances generally do not reach the required sites in
appropriate concentrations when administered by conventional methods. The
Company believes that its encapsulated-cell technology represents an approach
that may offer a number of advantages over other forms of delivery for
therapeutics.
 
    SITE-SPECIFIC DELIVERY
 
    Researchers have identified a number of substances that may be beneficial in
the treatment of human disorders. However, it has been difficult or impossible
to find a safe and effective way to deliver many of
 
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these potent substances to the required sites at the required concentrations and
at reasonable costs. Systemic delivery, such as oral or intravenous delivery,
may cause significant side effects since very potent molecules are being
delivered to sites in the body where they are not normally present or needed.
This is especially likely where large amounts are administered systemically to
achieve therapeutic levels in the central nervous system ("CNS"). A previous
clinical trial of a new protein, CNTF, sponsored by another company, for
example, resulted in significant side effects after systemic administration.
 
    In contrast, CytoTherapeutics' cell-containing devices are designed to
deliver these therapeutic substances to specific locations where they are
needed, thus avoiding many of the side-effects associated with conventional
routes of administration. This form of delivery should result in better
therapeutic ratios--reflecting an ability to provide effective doses with lower
toxicity. In addition, because therapeutic substances are produced by living
cells sustained within the implant, these substances potentially may be
delivered over extended periods of time. The production of these substances at
the site of action could eliminate problems of drug stability that hampers
effective treatment with other methods such as pumps and polymer carriers.
 
    RETRIEVABILITY
 
    The Company's implants are designed with a tether at the end of the active
portion of the implant to allow them to be retrieved with relative ease. By
exposing the tether, which is sutured below the skin, and withdrawing the
device, a physician should be able to retrieve or replace the implant. Should
complications arise, or if a new implant is desired, a physician should be able
to retrieve the capsule. Moreover, the capsule keeps the cells in the location
intended as opposed to unencapsulated cells that cannot be so constrained.
 
    DELIVERY OF MULTIPLE SUBSTANCES
 
    The Company's implants may also provide the advantage of delivering multiple
therapeutic substances simultaneously at a single site. The Company believes
that such an ability could lead to development of improved therapies. The
Company's implant to treat chronic pain is one such example of delivery of
multiple substances.
 
    GENE THERAPY
 
    The Company believes that its encapsulated-cell therapies may provide an
effective way to deliver gene therapy: the use of encapsulated cells to deliver
genetic information over an extended period may be able to increase the
efficiency of gene transfer to the host and hence improve the effectiveness of
gene therapy. In addition, the implant could be retrieved, if desired or
required. The Company does not presently have commercial access to any such
genes for use in gene therapy.
 
    There can be no assurance that the Company will successfully develop its
encapsulated-cell therapies or that, if successfully developed, such therapies
will achieve the benefits described above or that the advantages of such
therapies will be greater than the potential disadvantages.
 
               RESEARCH EFFORTS AND PRODUCT DEVELOPMENT PROGRAMS
 
    OVERVIEW OF RESEARCH AND PRODUCT DEVELOPMENT STRATEGY
 
    STEM CELL TECHNOLOGY.  The Company has devoted substantial resources to its
research programs to isolate and develop a series of stem/progenitor cells that
the Company believes can serve as a basis for replacing diseased or injured
cells. The focus of the Company's efforts to date have been directed at the
identification, isolation and the development of methods to expand a variety of
stem/progenitor cells of the human nervous system, liver and pancreas.
 
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    ENCAPSULATED CELL TECHNOLOGY.  The Company believes that its
encapsulated-cell technology can be used to deliver a wide variety of
therapeutic substances or vital cells to the sites where they are required. The
Company's lead product, its implant for treatment of chronic pain, is designed
to provide a new means of delivering substances with known therapeutic effects
directly to the CNS. The Company has also established a research program to
examine and develop applications of the Company's encapsulated-cell technology
to potential treatments for diseases of the eye, based on its encapsulated-cell
technology. Furthermore, the Company has focused research efforts directed to
identifying and banking a "hardy" human cell that can survive for sustained
periods and be engineered to produce multiple therapeutic substances.
 
    The following table lists the potential therapeutic indications for and
current status of CytoTherapeutics' primary research and product development
programs and projects and is qualified in its entirety by reference to the more
detailed descriptions of such programs and projects appearing elsewhere in this
Report. The Company continually evaluates its research and product development
efforts and reallocates resources among existing programs or to new programs in
light of experimental results, commercial potential, availability of third-party
funding, likelihood of near-term efficacy, collaboration success or significant
technology enhancement, as well as other factors. The Company's research and
product development programs are at relatively early stages of development and
will require substantial resources to commercialize. There can be no assurance
that the Company will successfully develop any product or obtain regulatory
approvals, enter clinical trials, achieve other milestones or commercialize any
products in accordance with currently anticipated timetables, or at all.
 
                   RESEARCH AND PRODUCT DEVELOPMENT PROGRAMS
 
<TABLE>
<CAPTION>
            PROGRAM DESCRIPTION                                                 STAGE/STATUS(1)
<C>                                          <S>
 
                                                       STEM CELL TECHNOLOGY
          HUMAN NEURAL STEM CELL                                                  PRECLINICAL
   Repair or replace damaged CNS tissue      - IN VITRO ability to initiate and expand stem cell-containing human neural cultures
                                             and differentiation into three types of CNS cells
                                             - Direct isolation of neurosphere-initiating stem cells from brain
                                             - IN VIVO demonstration of proper differentiation and engraftment of human neural
                                             cell cultures containing CNS stem cells in rodent CNS
          OPHTHALMOLOGIC DISEASES                                            PRECLINICAL RESEARCH
 Repair or replace damaged retinal tissue    Proof-of-concept in preclinical animal model(s)
            STEM CELL DISCOVERY                                                    RESEARCH
Repair or replace damaged pancreatic islet   Discovery program to identify, isolate and patent human stem cells for the pancreas
              or liver tissue                and liver
 
                                                   ENCAPSULATED CELL TECHNOLOGY
               CHRONIC PAIN                                                     CLINICAL TRIALS
             PARTNER: ASTRA AB               Phase IIB--enrollment for double-blind, placebo-controlled clinical trial for cancer
  Encapsulated bovine adrenal chromaffin     patients completed
    cells to deliver natural analgesic
   substances to CNS via the intrathecal
            space/lumbar region
        OPHTHALMOLOGIC DISEASES (2)                                          PRECLINICAL RESEARCH
Delivery of growth factors via encapsulated  Proof-of-concept in preclinical animal model(s)
                   cells
       HUMAN HARDY CELL DISCOVERY(2)                                               RESEARCH
   Multiple therapeutic applications for     Identify and bank human cell for use in encapsulated cell implants which survive for
        encapsulated cell implants           extended periods in vivo and can be engineered to produce multiple products
</TABLE>
 
(1) "Research" refers to early stage research and product development activities
    IN VITRO, including the selection and characterization of product candidates
    for preclinical testing. "Preclinical" refers to further testing of a
    defined product candidate IN VITRO and in animals prior to clinical studies.
 
(2) Progress in these programs is dependent upon CytoTherapeutics developing an
    appropriate platform cell(s) for these programs.
 
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RESEARCH AND DEVELOPMENT PROGRAMS
 
STEM CELL TECHNOLOGY
 
    The Company's portfolio of stem cell technology results from the Company's
exclusive licensing of neural stem/progenitor cell technology and other
technologies applicable to the pancreas and liver, the Company's own research
and development efforts to date, and the acquisition of StemCells, Inc. in 1997.
The Company, through its subsidiary, StemCells, has begun a program seeking to
discover and isolate various stem cells from the human body. The Company
believes that stem cells represent a fundamentally new approach to the treatment
of diseases caused by lost or damaged tissue. The Company has assembled an
experienced team of scientists and scientific advisors to consult with and
advise the Company's scientists on their continuing research and development of
stem/progenitor cells. This team includes, among others, Irving L. Weissman,
M.D., of Stanford University, Fred H. Gage, Ph.D., of The Salk Institute and
David Anderson, Ph.D., of the California Institute of Technology.
 
    NEURAL STEM/PROGENITOR CELL RESEARCH AND DEVELOPMENT PROGRAM
 
    The Company began its work with neural stem/progenitor cultures in
collaboration with NeuroSpheres, Ltd., in 1992. The Company believes that
NeuroSpheres was the first to invent these cultures and NeuroSpheres has filed
patent applications on its inventions relating to these cultures. The Company is
the exclusive, worldwide licensee from NeuroSpheres to such inventions for
transplantation in the human body. See "License Agreements and Sponsored
Research Agreements--NeuroSpheres, Ltd." In December 1998, the Company announced
that the US Patent and Trademark Office had granted patent No. 5,851,832,
covering the Company's methods for the human neural cell cultures containing
central nervous system stem cells, for compositions of human neural cell
cultures expanded by these methods, and for use of these cultures in human
transplantation and remyelination. These human neural stem/progenitor cell
cultures may be useful for repairing or replacing damaged central nervous system
tissue, including the brain and the spinal cord.
 
    Previously, in 1997, Company scientists invented a reproducible method for
isolating and growing human neural stem/progenitor cultures. In preclinical
IN-VITRO and early IN-VIVO studies, the Company demonstrated that these cells
differentiate into all three of the cell types of the CNS. Based on these
results, the Company believes that these cells may form the basis for
replacement of cells lost in certain degenerative diseases. The Company is
continuing research into, and has initiated the development of, its human neural
stem/progenitor cell cultures. The Company has initiated the cultures and
demonstrated that these cultures can be expanded for a number of generations IN
VITRO in defined media. A collaborator of the Company, Dr. Anders Bjorklund, has
shown that cells from these cultures can be successfully engrafted into the
brains of rodents where they migrated and differentiated into the appropriate
cell lineages for the site of the brain into which they were transplanted.
 
    In 1998, the Company expanded its preclinical efforts in this area by
initiating programs aimed at the discovery and use of specific monoclonal
antibodies to facilitate identification and isolation of neural and other stem
and progenitor cells or their differentiated progeny. Also in 1998, Company
researchers devised methods to advance the IN-VITRO culture and passage of human
neural stem cells that have resulted in a 100-fold increase in cell production
of these neural stem/progenitor cells after 6 passages. The Company is expanding
its preclinical efforts toward the goal of selecting the proper indications to
pursue.
 
    The Company's neural stem/progenitor cell program is at an early stage and
there can be no assurance that it will result in any commercial product.
 
    PANCREATIC AND LIVER STEM CELLS DISCOVERY RESEARCH PROGRAMS
 
    The Company's discovery program for the pancreatic stem/progenitor cell is
currently being conducted by Nora Sarvetnick, Ph.D. of The Scripps Research
Institute, who has initiated programs for the
 
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identification and isolation of the stem/progenitor cell for the pancreas. An
estimated 16 million people in the United States have diabetes mellitus, a
serious, lifelong condition, with approximately 650,000 new patients diagnosed
annually. Diabetes is widely recognized as one of the leading causes of death
and disability in the United States and is associated with long term
complications that affect almost every major part of the body. Diabetes-related
treatment costs exceed $100 billion annually. In 1998 the Company obtained an
exclusive, worldwide license from The Scripps Research Institute to novel
technology, developed by Dr. Sarvetnick as a result of the research sponsored by
the Company, which may be useful in identifying and isolating pancreatic islet
stem/progenitor cells. The Company believes that this technology may facilitate
their isolation using specific markers and leading to the development of
cell-based treatments for diabetes and other diseases characterized by loss of
pancreatic function.
 
    The Company initiated its discovery work for the liver stem/progenitor cell
through a sponsored research agreement with Markus Grompe, Ph.D. of Oregon
Health Sciences University. Dr. Grompe's work focuses on the discovery and
development of a suitable method for identifing and assessing liver
stem/progenitor cells for use in transplantation. Approximately 1 in 10
Americans suffers from diseases and disorders of the liver for which there are
currently no effective, long-term treatments. In 1998, Company researchers
continued to advance methods for establishing enriched cell populations suitable
for transplantation in preclinical animal models for evaluating these methods.
The Company is focused on discovering and utilizing its proprietary methods to
identify, isolate and culture liver stem/progenitor cells and to evaluate these
cells in preclinical animal models.
 
    An important element of the Company's program in stem cell discovery is the
development of intellectual property positions with respect to stem and
progenitor cells. The Company believes that the first person or entity to
isolate and perfect intellectual property rights in new stem/progenitor cells
will be able to exclude others from using such cells commercially. To this end,
the Company has also obtained rights to certain inventions relating to stem
cells from, and is conducting stem cell related research at, several academic
institutions. See "License Agreement and Sponsored Research Agreements." The
Company expects to expand its search for new stem/progenitor cells and to seek
to acquire rights to additional inventions relating to stem/progenitor cells
from third parties.
 
    The Company's pancreatic and liver stem/progenitor cells programs are at an
early stage and there can be no assurance that they will result in any
commercial products.
 
ENCAPSULATED-CELL TECHNOLOGY
 
    CHRONIC PAIN PROGRAM
 
    The Company estimates that more than one million patients in the United
States suffer unrelieved severe, chronic pain. Chronic, intractable pain often
accompanies, or is the result of, a number of serious diseases, procedures and
conditions such as cancer, infection, nerve damage, back surgery, arthritis,
amputation, fractures and other conditions. Even where therapies exist, they
often have limits to their effectiveness in treating severe, chronic pain. For
example, patients may become intolerant of or unresponsive to narcotics such as
morphine, and may experience undesirable side effects.
 
    The Company believes that its encapsulated cell technology can be used to
treat chronic pain by implanting encapsulated cells that continuously release
small quantities of naturally occurring analgesic substances, such as
catecholamines and opioid peptides. The Company, together with certain of its
academic collaborators, has developed methods for the encapsulation of bovine
adrenal chromaffin cells for implantation into the lumbar region of the spinal
column to treat chronic pain. The Company believes that encapsulating properly
chosen cell types which secrete desired therapeutic substances may provide more
effective pain relief than traditional approaches and/or may enable treatment of
patients who experience little or no relief with other therapies.
 
                                       7
<PAGE>
    During 1993 and 1994, the Company collaborated on a pilot clinical study of
its chronic pain implant technology with Dr. Patrick Aebischer, a founding
scientist of the Company. The study conducted at the Centre Hospitalier
Universitaire Vaudois ("CHUV") in Switzerland included nine seriously or
terminally ill patients experiencing severe, intractable pain for whom
narcotics, such as morphine, provided inadequate relief or could not be
tolerated. The implant procedure was performed safely in all nine patients.
Viable implants containing cells were retrieved from eight of the nine patients
upon the death of the patient or at or beyond the end of the intended trial
period.
 
    In May 1995, the Company commenced its first Company-sponsored
Investigational New Drug ("IND") trial in the United States. The Phase I trial
was an open label study which included 15 terminally ill cancer patients
experiencing severe, intractable pain and having a life expectancy of less than
five months. According to the trial protocol, patients were to receive treatment
for the remainder of their lives. By February 26, 1997, all 15 patients had
completed the study.
 
    In February 1996, the Company initiated an extension of the Phase I trial.
In this extension, four patients received a device containing approximately
three times the number of cells used in the devices implanted in the first 15
patients. By February 9, 1998, three of the four patients had completed the
study. The one patient that remains in the study has had a device in place for
nearly three years without any related significant safety issues.
 
    A Phase IIA clinical trial for the treatment of neuropathic pain was then
initiated in Switzerland in May 1997. A parallel study was initiated in August
1997 in the United States. These trials were designed to evaluate the safety and
retrievability of the larger device. Neuropathic pain patients were implanted
with the device for 10 weeks. During the period, patients were monitored for
safety and pain scores. Following removal of the original device, patients could
elect to be reimplanted for six months.
 
    In addition, in November 1997, a Phase IIB, placebo-controlled,
double-blinded, multi-center trial in cancer patients was initiated in central
Europe and Switzerland. In this trial, patients with end-stage cancer were
implanted with either a cell-containing device or a placebo device for 10 weeks
and are being monitored for pain scores, concurrent pain-related drug usage and
quality of life. According to the trial protocol and following removal of the
original device, patients could elect to be implanted with an active device for
six months. Upon completion of enrollment in March 1999, approximately 85
evaluable patients had participated in the trial.
 
    In December 1997, the Company became aware, after explant of devices from
some patients enrolled in the Phase IIA trials, that a significant number of
devices had migrated into or out of the intrathecal space during the evaluation
period. In some cases migration resulted in device breakage. To date, there have
been no reports of significant medical complications related to device migration
or breakage. However, in January 1998, the Company and its partner, Astra Pain
Control, announced that they had halted accrual of patients into the Phase IIB
trial in order to allow for a full investigation and the development of
implantation procedure modifications. The Company investigated the migration
phenomenon and determined that it was necessary to modify the device and the
implantation procedure to prevent migration. These modifications included the
development of a "tether clip" to assist in securing the implants. After the
development and implementation of modifications to the implantation procedure,
the Company and its partner, Astra Pain Control, announced they had resumed
accrual of patients in the Phase II trials in June 1998.
 
    All clinical trials are being conducted by Astra Pain Control.
 
    The Company has been closely monitoring the development of regulatory
regimes intended to deal with the risks of xenotransplantation and the use of
bovine cells. See "Government Regulations." Although the FDA has proposed
guidelines for the conduct of xenotransplantation trials, a number of European
countries, for example, have been more restrictive. The FDA has imposed strict
and potentially onerous restrictions on the clinical use of non-human cells.
These proposed FDA regulations could substantially
 
                                       8
<PAGE>
increase the production costs of implants for the Company's pain program. In
addition, such regulations may adversely affect physicians' and patients'
perceptions about xenotransplantation. The Company cannot predict the effect of
existing regulations or possible future regulatory actions except that, if not
modified, they will likely increase the cost of producing pain implants. There
can be no assurance that such regulations will not block sales or make the
product commercially non-viable.
 
    There can be no assurances that the Company will receive regulatory and/or
ethical committee approvals to continue the Phase II trials or to initiate other
clinical trials in a timely manner or that such clinical trials will be
successfully completed or that, if successfully completed, such trials will lead
to the commercialization of any product.
 
    In March 1995, the Company entered into a Collaborative Research and
Development Agreement with Astra AB for the development and marketing of certain
encapsulated cell products to treat pain. Astra has the right to terminate this
Agreement anytime after April 1998. However, in May 1998, Astra AB agreed to
increase its annual research and development payments to the Company under this
Agreement in order to facilitate the completion of the Phase IIB clinical trial.
The Company expects that the results from this trial will be available about
mid-1999. The Company expects Astra to make a decision on continued support for
the Company's chronic pain program based in substantial part on Astra's review
of the results of this trial. Continuation of the Company's chronic pain program
will likely depend on a prompt decision by Astra to continue or increase such
support. See "Corporate Collaborations--Astra AB."
 
    OPHTHALMOLOGY PROGRAM
 
    Many diseases of the eye are presently ineffectively treated, which can lead
to reduced vision and blindness. There are more than one million blind people in
the United States and many more Americans suffer from potentially visually
impairing ophthalmologic disorders. The worldwide populations at risk are much
larger.
 
    Certain diseases of the eye, e.g., glaucoma and anterior segment
inflammation, can be treated today with topical preparations, although the
efficacy of these treatments is variable. These disorders are treatable largely
because some or all of the disease processes occur in the anterior portion of
the eye, which is accessible to topical drugs. Other serious diseases, such as
diabetic retinopathy and age-related macular degeneration, are not treatable, in
part because they occur in the posterior portion of the eye, an area that is
essentially unreachable with most current treatment methods.
 
    Many of these untreatable diseases affect the retina, a posterior part of
the eye critical to sight. The retina is part of the CNS and the Company
believes that its encapsulated-cell implant technologies can be applied to
bypass the blood-retinal barrier of the eye using the same approach as bypassing
the blood-brain barrier in the rest of the CNS. If these implants are
successfully developed, the Company believes this delivery platform could allow
treatment of serious sight-threatening disorders.
 
    CytoTherapeutics has begun design and production of implants adapted for use
in the eye and has started initial pre-clinical testing in animals with these
implants.
 
    OTHER ENCAPSULATED CELL PROGRAMS
 
    The Company has sponsored research to evaluate the feasibility and
tolerability of using encapsulated cells to deliver neurotrophic factors into
the CNS to treat neurodegenerative diseases such as ALS and Huntington's
disease. An investigator-sponsored pilot clinical study of the Company's
encapsulated cell implant to deliver CNTF (ciliary neurotrophic factor) into the
brain ventricles of six Huntington's patients is currently underway in France.
 
                                       9
<PAGE>
    TECHNOLOGY DEVELOPMENT
 
    The Company continues to develop its encapsulated-cell technology. Through
its cell biology program, the Company is developing genetically engineered cell
lines that will function optimally when encapsulated. The Company's present work
focuses on identification of appropriately hardy human cells because of the
increasing regulatory constraints on use of non-human cells. There can be no
assurance such development will be successful.
 
    The Company is developing cell lines which may represent important
components in second generation products (e.g., an engineered cell line to
deliver analgesics in its pain program) or new products (such as a single device
to deliver multiple therapeutic substances). It is also conducting research to
improve cell line expression levels of therapeutic substances, as well as
regulation and consistency of output.
 
    The Company continues to evaluate new and modified forms of membranes for
use in its implants. These evaluations are focused on developing membranes with
increased strength, improved handling characteristics, enhanced transport
qualities and greater biocompatibility. These efforts are undertaken internally,
as well as externally with Akzo Nobel Membrana GmbH. See "Corporate
Collaborations-- Akzo Nobel Membrana GmbH."
 
    The Company is also assessing and developing distribution, handling, and
insertion systems to facilitate the distribution of its implants to clinicians
and enable clinicians both to surgically implant these devices into patients and
to retrieve and replace them, as necessary. See "Manufacturing."
 
SUBSIDIARY
 
    STEMCELLS, INC.
 
    On September 26, 1997, CytoTherapeutics acquired by merger StemCells, Inc.,
a California corporation ("StemCells"). Through the merger, CytoTherapeutics
acquired StemCells in exchange for 1,320,691 shares of the Company's common
stock and options and warrants for the purchase of 259,296 common shares.
Simultaneously with the acquisition of StemCells, Richard M. Rose, M.D.,
President of StemCells, Inc., became President, Chief Executive Officer and a
director of CytoTherapeutics, and Irving L. Weissman, M.D., a founder of
StemCells, Inc., became a director of CytoTherapeutics.
 
    The Company's current stem cell research is being conducted pursuant to the
provisions of an agreement between CytoTherapeutics and Drs. Weissman and Gage
providing for a two-year research plan. If the goals of the research plan are
accomplished, the stem cells research will continue to be funded under an
extension of such Research Plan approved by a Research Committee consisting of
two persons chosen by Drs. Weissman and Gage, two persons chosen by the Company
and a fifth member appointed by Drs. Weissman and Gage, subject to the
reasonable approval of the Company. Increases in stem cells research funding of
not more than 25% a year approved by the Committee will be funded by
CytoTherapeutics (although CytoTherapeutics also retains the right to fund such
programs at a higher level) for as long as the goals of the Research Plan are
being met, provided however, that CytoTherapeutics will retain the option of (i)
ceasing or reducing neural stem research even if all of Research Plan goals are
being met by accelerating the vesting of all still-achievable performance-based
options granted to Drs. Weissman and Gage and other scientists and (ii) ceasing
or reducing non-neural stem cell research even if all Plan goals are being met
by affording StemCells' scientific founders the opportunity to continue
development of the non-neural stem research by licensing the technology related
to such research to them in exchange for a payment to CytoTherapeutics equal to
all funding for such research, plus royalty payments.
 
                                       10
<PAGE>
CORPORATE COLLABORATIONS
 
    ASTRA AB
 
    In March 1995, the Company signed a collaborative research and development
agreement with Astra for the development and marketing of certain
encapsulated-cell products to treat pain. Astra made an initial, non-refundable
payment of $5,000,000 and may make up to $16,000,000 in additional payments
subject to the achievement of certain development milestones. Under the
agreement, the Company is obligated to conduct certain research and development
pursuant to a four-year research plan agreed upon by the parties. Over the term
of the research plan, the Company expects to receive annual research payments
from Astra of approximately $5-7 million, which the Company expects should
approximate the research and development costs incurred by the Company under the
plan. Approximately $38 million of research and development funding has been
received by the Company through December 31, 1998. Subject to the successful
development of such candidate products and obtaining necessary regulatory
approvals, Astra is obligated to fund and to conduct all clinical trials of
candidate products arising from the collaboration and to seek approval for their
sale and use. Astra has the exclusive worldwide right to market products covered
by the agreement. Until the later of either the last to expire of all patents
included in the licensed technology or a specified fixed term, the Company is
obligated to manufacture and supply products and is entitled to a fixed royalty
on the worldwide net sales of such products in return for the license granted to
Astra and the supply of product. Astra has the right to terminate the agreement
for any reason after April 1, 1998.
 
    In May 1998, after the resumption of the Phase II clinical trial of the lead
product candidate, Astra AB agreed to increase annual research and development
payments under this Agreement in order to fund the completion of the Phase IIB
clinical trials. It is expected that results from this trial will be available
in about mid-1999. There can be no assurance that Astra will continue to fund
this program beyond mid-1999.
 
    MODEX THERAPEUTIQUES SA
 
    In July 1996, CytoTherapeutics, together with certain founding scientists,
established Modex Therapeutiques SA ("Modex") a Swiss biotherapeutics company to
pursue extensions of CytoTherapeutics' broad-based, encapsulated-cell technology
for certain applications outside the central nervous system. Modex,
headquartered in Lausanne, Switzerland, was formed to integrate technologies
developed at three universities located in Lausanne--the University of Lausanne,
the Centre Hospitalier Universitaire Vaudois (CHUV), the Ecole Polytechnique
Federale de Lausanne--as well as from the Albert Einstein College of Medicine of
Yeshiva University in New York City and CytoTherapeutics to develop products to
treat non-CNS diseases such as diabetes, obesity and anemia. In October 1997,
the Company completed a series of transactions which resulted in the
establishment of Modex as an independent company in which CytoTherapeutics has
an equity position of approximately 17%.
 
    In October 1997, as part of Modex obtaining funds from outside investors,
the Company and Modex modified the terms of their existing royalty-bearing Cross
License Agreement to (i) expand the field in which Modex is exclusively licensed
to apply the Company's encapsulated-cell technology to include, in addition to
the original field of diabetes, obesity and anemia, the treatment of hemophilia
A and B utilizing Factor VIII and/or Factor IX, and two additional applications
to be agreed to by the Company and Modex; (ii) eliminate the requirement to make
future milestone payments to Modex of up to 300,000 shares of the Company's
Common Stock; (iii) limit the scope of the Company's technology licensed to
Modex to existing and future encapsulation 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 the application of
 
                                       11
<PAGE>
diseases, conditions and disorders of the central nervous system to existing and
future encapsulation technology and to certain additional existing technology.
 
    AKZO NOBEL MEMBRANA GMBH
 
    To develop additional new membranes to be used in the Company's
encapsulated-cell products and to obtain access to membrane expertise from one
of the world's leading membrane companies, the Company entered into a
Development and Supply Agreement with Akzo Nobel Membrana GmbH ("Akzo") dated
December 1, 1993. Akzo is the world's largest supplier of medical grade
membranes. Under the terms of the agreement, Akzo has begun development of
improved membranes for use by the Company. The Company has agreed to reimburse
Akzo for a portion of Akzo's costs incurred in the development. In the event the
Company determines to use membranes developed by Akzo in the Company's products,
Akzo will supply membranes to the Company at Akzo's cost plus a certain profit.
Akzo will also be entitled to a royalty on sales of the Company's products
utilizing Akzo's membranes. Akzo has agreed not to supply membranes to any other
third party for encapsulation of cells for in vivo therapeutic applications.
Either Akzo or the Company can terminate the Agreement. In the event Akzo is
unable or unwilling to supply sufficient quantity of membranes to meet the
Company's needs, Akzo will license the technology necessary to manufacture the
membranes to CytoTherapeutics.
 
    The Company has the right to utilize membranes from other manufacturers in
its products provided the Company pays a small royalty to Akzo on the sales of
such products. The Company will also continue its internal membrane development
efforts, and may utilize internally developed membranes in its products without
obligation to Akzo.
 
    For the years ending December 31, 1998, 1997 and 1996, the Company paid Akzo
under the terms of the agreement approximately $192,000, $98,000 and $295,000,
respectively.
 
    SIGNAL PHARMACEUTICALS, INC.
 
    In December 1997, StemCells, Inc. entered into two license agreements with
Signal Pharmaceuticals, Inc. under which each party licensed to the other
certain patent rights and biological materials for use in defined fields. An
initial disagreement as to the interpretation of the rights licensed to
StemCells, Inc. was resolved by the parties, and the agreements are operating in
accordance with their terms.
 
    GENENTECH, INC.
 
    In November 1996, the Company signed collaborative development and licensing
agreements with Genentech relating to the development of products using the
Company's technology to deliver certain of Genentech's proprietary growth
factors to treat Parkinson's disease, Huntington's disease and amyotrophic
lateral sclerosis ("ALS").
 
    Under the terms of the agreement for Parkinson's disease, Genentech had the
right, in its discretion, to terminate the Parkinson's program at specified
milestones in the program, and on May 21, 1998, Genentech exercised its right to
terminate the Parkinson's collaboration. For information regarding certain
financial consequences of such termination, see "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Liquidity and Capital
Resources."
 
    Under the terms of the Company's agreements with Genentech relating to
Huntington's disease and ALS, the Company is responsible for conducting and
funding all pre-clinical and clinical development, subject to specified rights
of Genentech to participate in the development and marketing of the proposed
products. Should Genentech share in the development cost of the proposed
products, the Companies will share profits at a negotiated percentage upon
commercialization. Should Genentech elect not to participate in the development,
upon commercialization, the Company will pay Genentech an agreed-upon royalty
based upon sales. Under these agreements, the Company's license to Genentech's
proprietary growth factors (neurotrophin 4/5 and cardiotrophin-1) is dependent
upon the Company using reasonable
 
                                       12
<PAGE>
efforts to achieve certain development milestones within prescribed periods. The
Company does not presently intend to devote significant resources to the
continuing pursuit of these projects and thus does not currently expect to
maintain such licenses.
 
LICENSE AGREEMENTS AND SPONSORED RESEARCH AGREEMENTS
 
    NEUROSPHERES, LTD.
 
    In March 1994, the Company entered into a Contract Research and License
Agreement with NeuroSpheres, Ltd. Under the agreement, the Company obtained from
NeuroSpheres an exclusive, worldwide, royalty-bearing license for the commercial
development and use of certain neural stem cells for transplantation to treat
human disease. In 1997, the Company settled a dispute that arose between it and
NeuroSpheres, Ltd. under the agreement. Pursuant to the settlement, the Company
has obtained an exclusive patent license from NeuroSpheres in the field of
transplantation, subject to a limited right of NeuroSpheres to purchase a
nonexclusive license from the Company. Such right was unexercised by
Neurospheres and expired in April 1998. The Company and NeuroSpheres have no
further research obligations to one another. The Company has developed
additional intellectual property relating to the subject matter of the license.
 
    COGNETIX, INC.
 
    In February 1997, CytoTherapeutics and Cognetix, Inc. entered into a
Collaboration and Development Agreement to screen selected peptides isolated by
Cognetix for possible development into therapeutic products aimed at a broad
range of human disease states using CytoTherapeutics' cell-based delivery
technology. The Company and Cognetix have also entered into an option agreement
giving the Company the right to option up to three of Cognetix's compounds for
use in treating eye diseases. CytoTherapeutics has exercised its right to one
protein, ConG. The Company and Cognetix are presently discussing revisions to
their relationship under the agreements.
 
    STATE OF RHODE ISLAND
 
    In 1989, the Company entered into an agreement with the State of Rhode
Island pursuant to which an agency of the State reimbursed the Company
$1,172,000 for certain research activities the Company funded at Brown
University. Under the terms of this grant, the Company is obligated to pay
royalties ranging from three to five percent of revenues from products developed
under the agreement, to a maximum of $1,758,000.
 
    ACADEMIC RELATIONSHIPS
 
    The Company and its wholly owned subsidiary, StemCells, Inc., have entered
into a number of research and/or license agreements with academic organizations.
These research agreements provide that the Company will fund certain research
costs and, in return, will have a license or an option for a license to the
resulting inventions. Under these license agreements, the Company and/or
StemCells, Inc. will typically be subject to obligations of due diligence and
the requirement to pay royalties on products that use patented technology
licensed under such agreements.
 
                             CYTOTHERAPEUTICS, INC.
 
    The Company has expended and expects to continue to expend substantial sums
to support academic research programs. To date, the Company's principal academic
collaborations have been with Brown University and Dr. Patrick Aebischer at the
Centre Hospitalier Universitaire Vaudois in Switzerland. Research and
development expenses paid in connection with these collaborations aggregated
approximately $701,000, $1,326,000 and $1,337,000 for the years ended December
31, 1998, 1997 and 1996, respectively. The Company and StemCells, Inc. also have
a number of collaborative relationships with other academic institutions and
academic researchers.
 
                                       13
<PAGE>
                                STEMCELLS, INC.
 
    StemCells, Inc. has entered into a number of research agreements with
academic institutions. These include a Sponsored Research Agreement with The
Scripps Research Institute and a Sponsored Research Agreement with Oregon Health
Sciences University. These agreements require StemCells, Inc. to fund certain
research (in the amounts of approximately $931,000 over three years and $105,000
in 1997 and $558,000 in 1998) in return for licenses or options to license the
inventions resulting from such research.
 
    In addition, StemCells, Inc. has entered into license agreements with the
California Institute of Technology and the University of Utah Research
Foundation. These license agreements and the agreements referred to in the
foregoing paragraph relate largely to stem cells or to progenitor cells and to
their isolation and identification.
 
MANUFACTURING
 
    ENCAPSULATED CELLS
 
    The Company believes the ability to manufacture encapsulated-cell products
that are safe and effective will be a key source of competitive advantage in its
encapsulated-cell therapy business. Thus, the Company intends to manufacture its
proposed products and maintain control of this important proprietary element of
its business wherever possible.
 
    The manufacturing process for the Company's lead product (its chronic pain
implant) is comprised of five modules: (i) manufacture of the fiber membrane;
(ii) assembly of implants; (iii) acquisition and culturing of the cells; (iv)
placement of the cells within the implant; and (v) packaging of the cell-loaded
implants for shipping to the clinical site. The Company is employing this
process, using current Good Manufacturing Practices ("cGMP"), for manufacturing
its pain implants for use in clinical trials. Quality control tests are
performed on each batch of the finished pain devices to assess sterility and
potency. Only batches meeting all specifications are released for use in
clinical trials. Critical equipment and processes have been validated to assure
manufacturing consistency and control. A 21,000-square foot laboratory and pilot
manufacturing facility is now in operation.
 
    Implants for clinical trials are currently produced in small quantities. The
commercial-scale manufacture of these products is expected to require
specialized automated or semi-automated equipment and expansion of manufacturing
facilities. The Company's current manufacturing process has been designed to
facilitate the incorporation of additional automation over time.
 
    The facilities and equipment required to manufacture the Company's
encapsulated-cell implants are different from those required to manufacture
potentially competitive biopharmaceutical products.
 
    The Company's pilot manufacturing plant, without additional expansion or
increasing staffing, does not have sufficient capacity to permit the Company to
produce all of the products necessary to complete clinical trials in all
indications the Company may wish to develop. In addition, the Company has not
yet developed the capability to manufacture any of its proposed products on a
commercial scale and is unaware of any other company that has manufactured any
membrane encapsulated-cell product on a commercial scale. Manufacture of the
Company's proposed products is expected to require specialized, automated
equipment capable of forming complex polymer membranes into implants which
combine media, matrices and living cells, and this process must be carried out
on a precisely controlled basis, under sterile conditions in a clean-room
environment. Failure to achieve commercial scale manufacturing capability at a
reasonable cost or to demonstrate consistent results using manufactured
prototypes in preclinical animal studies or clinical trials could prevent or
delay submission of products for regulatory approval and initiation of new
development programs, which could have a materially adverse effect on the
Company. Regulatory restrictions have substantially increased the likely cost of
manufacturing a product containing xenogeneic cells for commercial use. Since in
certain cases the Company has agreed on pricing for supply of its products
before commercial production begins, additional costs of production arising from
regulations or otherwise may cause the Company's cost of production to exceed
the price it receives for
 
                                       14
<PAGE>
producing such products. In addition, fearing liability, certain suppliers of
raw materials used by the Company in connection with its implants have or may
restrict use of such materials in humans.
 
    There can be no assurance that the Company will be able to develop the
capability of manufacturing any of its proposed products on a cost-effective
basis, or to identify and contract with manufacturers to produce such products
or needed raw materials, at a cost or in the quantities necessary to make a
commercially viable product.
 
    STEM CELLS
 
    The keys to successful commercialization of neural stem/progenitor cells are
expected to include efficacy, safety, consistency of the product and economy of
the process. The Company expects to address these issues by appropriate testing
and banking representative vials of large-scale cultures. Commercial production
is expected to involve expansion of banked cells and packaging them in an
appropriate container(s) after formulating the cells in an effective carrier
(which may also be used to affect the stability and engrafting of the stem cells
or their progeny). Because of the early stage of the Company's stem/ progenitor
cell programs, the issues that will affect manufacture of stem/progenitor cell
products are relatively unclear.
 
MARKETING
 
    The Company expects to market and sell its products primarily through
co-marketing, licensing or other arrangements with third parties. The Company
does not have experience in sales, marketing or distribution and does not expect
to develop such capabilities in the near future. Generally, the Company in its
commercial arrangements with third parties intends to have the marketing of its
products undertaken by its partners, although the Company may seek to retain
limited marketing rights in specific markets, particularly where the product may
be addressed by a specialty or niche sales force.
 
PATENTS, PROPRIETARY RIGHTS AND LICENSES
 
    The Company believes that proprietary protection of its inventions will be
of major importance to its future business. The Company has a program of
vigorously seeking and protecting intellectual property it believes may be
useful in connection with its products. The Company believes that its know-how
will also provide a significant competitive advantage and intends to continue to
develop and protect its know-how. The Company may also, from time to time, seek
to acquire licenses to important externally developed technologies.
 
    The Company has exclusive or non-exclusive rights to a portfolio of patents
and patent applications related to the encapsulation of cells and related
technologies and to various stem cells and methods of deriving and using them.
In general, these encapsulation patents and patent applications pertain to the
release of neurotransmitters from encapsulated cells, use of various cell types,
encapsulation devices and their manufacture, encapsulation methods and various
aspects of the therapeutic use of capsules in the treatment of various diseases.
The stem/progenitor cell patents and patent applications relate mainly to
compositions of matter, methods of obtaining such cells, and methods for
preparing and utilizing such cells. Currently, the Company's U.S. patent
portfolio includes 10 issued U.S. patents in the stem cell therapy area, an
increase of 5 issued patents in 1998, with an additional 28 patent applications
pending in the stem cell therapy area (three of which have been allowed and are
pending issuance), and also includes 56 issued U.S. patents in the
encapsulated-cell therapy area, an increase of 20 additional patents in 1998.
 
    The patent positions of pharmaceutical and biotechnology companies,
including those of the Company, are uncertain and involve complex and evolving
legal and factual questions. The coverage sought in a patent application can be
denied or significantly reduced before or after the patent is issued.
Consequently, the Company does not know whether any of its pending applications
will result in the issuance of patents, or if any existing or future patents
will provide significant protection or commercial advantage or will be
circumvented by others. Since patent applications are secret until patents are
issued in the United States or
 
                                       15
<PAGE>
until the applications are published in foreign countries, and since publication
of discoveries in the scientific or patent literature often lags behind actual
discoveries, the Company cannot be certain that it was the first to make the
inventions covered by each of its pending patent applications or that it was the
first to file patent applications for such inventions. There can be no assurance
that patents will issue from the Company's pending or future patent applications
or, if issued, that such patents will be of commercial benefit to the Company,
afford the Company adequate protection from competing products or not be
challenged or declared invalid.
 
    In the event that a third party has also filed a patent application relating
to inventions claimed in Company patent applications, the Company may have to
participate in interference proceedings declared by the United States Patent and
Trademark Office to determine priority of invention, which could result in
substantial uncertainties and cost for the Company, even if the eventual outcome
is favorable to the Company. There can be no assurance that the Company's
patents, if issued, would be held valid by a court of competent jurisdiction.
 
    A number of pharmaceutical, biotechnology and other companies, universities
and research institutions have filed patent applications or have been issued
patents relating to cell therapy and encapsulation, stem cells and other
technologies potentially relevant to or required by the Company's expected
products. In particular, a third party has received a U.S. patent which such
third party asserts relates to cells for alleviating chronic pain in humans. The
Company cannot predict which, if any, of such applications will issue as patents
or the claims that might be allowed. The Company is aware that a number of
companies have filed applications relating to stem cells. The Company is also
aware of a number of patent applications and patents claiming use of genetically
modified cells to treat disease, disorder or injury. The Company also cannot
predict the impact of the application of existing patent applications and
patents on future unencapsulated products. The Company is aware of two patents
issued to a competitor claiming certain methods for treating defective, diseased
or damaged cells in the mammalian CNS by grafting genetically modified donor
cells from the same mammalian species. The Company is also aware of third party
patents and patent applications claiming rights to the neurotrophic factors
which the Company hopes to deliver with its cell encapsulation technology, and
to the production of these factors through the use of genetically modified
cells. The Company expects to use genetically modified cells to produce these
factors for use in its products.
 
    The Company may also be required to seek licenses in regard to other cell
lines, the techniques used in creating or obtaining such cell lines, growth
factors required to obtain and maintain such cell lines, the materials used in
the manufacture of its implants or otherwise. If third party patents or patent
applications contain claims infringed by the Company's technology and such
claims or claims in issued patents are ultimately determined to be valid, there
can be no assurance that the Company would be able to obtain licenses to these
patents at a reasonable cost, if at all, or be able to develop or obtain
alternative technology. If the Company is unable to obtain such licenses at a
reasonable cost, it may be adversely affected. There can be no assurance that
the Company will not be obliged to defend itself in court against allegations of
infringement of third-party patents. Patent litigation is very expensive and
could consume substantial resources and create significant uncertainties. An
adverse outcome in such a suit could subject the Company to significant
liabilities to third parties, require disputed rights to be licensed from third
parties, or require the Company to cease using such technology.
 
    The Company also relies upon trade-secret protection for its confidential
and proprietary information. There can be no assurance that others will not
independently develop substantially equivalent proprietary information or
techniques, gain access to the Company's trade secrets or disclose such
technology, or that the Company can meaningfully protect its trade secrets.
 
    The Company's policy is to require its employees, consultants, significant
scientific collaborators and sponsored researchers to execute confidentiality
agreements upon the commencement of an employment or consulting relationship
with the Company. These agreements generally provide that all confidential
information developed or made known to the individual by the Company during the
course of the
 
                                       16
<PAGE>
individual's relationship with the Company is to be kept confidential and not
disclosed to third parties except in specific circumstances. In the case of
employees and consultants, the agreements generally provide that all inventions
conceived by the individual in the course of rendering services to the Company
shall be the exclusive property of the Company. There can be no assurance,
however, that these agreements will provide meaningful protection or adequate
remedies for the Company in the event of unauthorized use, transfer or
disclosure of such information or inventions.
 
    The Company has obtained rights from universities and research institutions
to technologies, processes and compounds that it believes may be important to
the development of its products. These agreements typically require the Company
to pay license fees, meet certain diligence obligations and, upon commercial
introduction of certain products, pay royalties. These include exclusive license
agreements with Brown University to certain patents and know-how regarding
present and certain future developments in encapsulation technology; and with
NeuroSpheres, Ltd., The Scripps Institute and the California Institute of
Technology to certain patents and know-how regarding present and certain future
developments in neural and pancreatic stem cells. The Company's licenses may be
canceled or converted to non-exclusive licenses if the Company fails to use the
relevant technology or the Company breaches its agreement. Loss of such licenses
could expose the Company to the risks of third-party patents and/or technology.
There can be no assurance that any of these licenses will provide effective
protection against the Company's competitors.
 
COMPETITION
 
    The Company's initial products are expected to compete with a variety of
therapeutic products and procedures. Major pharmaceutical companies currently
offer a number of pharmaceutical products to treat chronic pain,
neurodegenerative diseases, and other diseases for which the Company's
technologies may be applicable. The Company believes that its products, if
successfully developed, will compete with these products principally on the
basis of improved and extended efficacy and safety and the overall economic
benefit to the health care system offered by such products. However, many
pharmaceutical and biotechnology companies are investigating new drugs and
therapeutic approaches to treat neurodegenerative diseases, which may achieve
new and better efficacy profiles, extend the therapeutic window for such
products, alter the prognosis of these diseases or prevent their onset.
 
    The market for therapeutic products that address degenerative diseases is
large, and competition is intense and is expected to increase. The Company's
most significant competitors are expected to be fully integrated pharmaceutical
companies and more established biotechnology companies. Such competitors have
significant resources and expertise in research and development, manufacturing,
testing, obtaining regulatory approvals and marketing and also have
significantly greater capital resources. Smaller companies may also prove to be
significant competitors, particularly through collaborative arrangements with
large pharmaceutical or biotechnology companies. Many of these competitors have
significant products approved or in development which could be competitive with
the Company's potential products, and also operate large, well-funded research
and development programs. In addition, the Company competes with other companies
and institutions for highly qualified scientific and management personnel.
 
    The Company's products to treat chronic pain, if successfully developed,
will compete with epidural and intrathecal opiates, such as morphine and its
analogs, and with adjuvant analgesics, antidepressants and anticonvulsants, as
well as with new therapeutics under development, such as SNX 111, a conopeptide.
New delivery and dose control methods for traditional pain treatments, such as
morphine pumps, may also compete with the Company's products.
 
    The Company's stem/progenitor cell products, if successfully developed,
might face competition from orally administered drugs, other forms of cell
transplantation, ablative and stimulative procedures, gene therapy and new drugs
under development. In addition, the Company believes that its competitors are
trying to develop stem/progenitor cell-based technologies. The Company expects
that these products, if developed, will compete with the Company's potential
stem/progenitor cell products based on efficacy,
 
                                       17
<PAGE>
safety, cost and intellectual property positions. The Company expects that gene
therapy, if successfully developed, will also be a source of competition for
potential stem/progenitor cell products.
 
    There can be no assurance that the Company's competitors will not succeed in
developing technologies and products that are more effective than those being
developed by the Company or that would render the Company's technology obsolete
or non-competitive. The Company may also face competition from companies which
have filed patent applications relating to cell encapsulation and the use of
genetically modified cells to treat disease, disorder or injury. The Company may
be required to seek licenses from these competitors in order to commercialize
certain of its proposed products and there can be no assurance that the Company
will be able to obtain such licenses at a reasonable cost, if at all.
 
    Any product that the Company succeeds in developing and for which it gains
regulatory approval must then compete for market acceptance and market share.
For certain of the Company's potential products, an important competitive factor
will be the timing of market introduction of competitive products. Accordingly,
the Company expects that an important competitive factor will be the relative
speed with which the Company and its competitors can develop products, complete
the clinical testing and approval processes and supply commercial quantities of
a product to market. With respect to clinical testing, competition may delay
progress by limiting the number of clinical investigators and patients available
to test the Company's potential products.
 
    Competition for the Company's products is also expected to be based on
product efficacy, safety, the timing and scope of regulatory approvals
including, in certain instances, obtaining marketing exclusivity under the
Orphan Drug Act, availability of supply, marketing and sales capability,
reimbursement coverage, price and patent and technology position. There can be
no assurance that the Company's technology, if fully developed, will become
commercially viable.
 
GOVERNMENT REGULATION
 
    The manufacturing and marketing of the Company's potential products and its
research and development activities are and will continue to be subject to
regulation for safety and efficacy by numerous governmental authorities in the
United States and other countries. In the United States, pharmaceuticals,
biologicals and medical devices are subject to rigorous FDA regulation. The
Federal Food, Drug and Cosmetic Act, as amended, and the Public Health Service
Act, as amended, the regulations promulgated thereunder, and other Federal and
state statutes and regulations govern, among other things, the testing,
manufacture, safety, efficacy, labeling, storage, export, record keeping,
approval, marketing, advertising and promotion of the Company's potential
products. Product development and approval within this regulatory framework
takes a number of years and involves substantial uncertainty combined with the
expenditure of substantial resources. In addition, the United States, states and
other jurisdictions have restrictions on the use of fetal tissue that could
restrict the Company's use of such materials.
 
    Three branches of the FDA, the Center for Drug Evaluation and Research, the
Center for Biologics Evaluation and Research and the Center for Devices and
Radiological Health, review and approve drugs, biologics and devices,
respectively. The FDA has indicated to the Company that the Center for Biologics
Evaluation and Research will have primary jurisdiction for pre-market review of
the Company's potential products that utilize the Company's encapsulated-cell
technology. However, the FDA has also indicated that the Center for Drug
Evaluation and Research and the Center for Devices and Radiological Health will
play a role in the agency's review of the Company's potential products. In
addition, the FDA has published certain guidelines regarding living cells and
their transplantation and has begun to develop guidelines for the regulation of
transplantation of xenogeneic cells and organs.
 
    The steps required before the Company's potential products may be marketed
in the United States include (i) preclinical laboratory and animal tests, (ii)
the submission to the FDA of an application for an Investigational New Drug
Exemption ("IND"), which must become effective before U.S. human clinical trials
may commence, (iii) adequate and well-controlled human clinical trials to
establish the safety and efficacy of the product, (iv) the submission to the FDA
of a marketing authorization application(s) and
 
                                       18
<PAGE>
(v) FDA approval of the application(s) prior to any commercial sale or shipment
of the drug. Biologic product manufacturing establishments located in certain
states also may be subject to separate regulatory and licensing requirements.
 
    Preclinical tests include laboratory evaluation of the product and animal
studies to assess the potential safety and efficacy of the product and its
formulation as well as the quality and consistency of the manufacturing process.
The results of the preclinical tests are submitted to the FDA as part of an IND,
and the IND becomes effective 30 days following its receipt by the FDA, absent
questions, requests for delay or objections from the FDA.
 
    Clinical trials involve the evaluation of the product in healthy volunteers
or, as may be the case with the Company's potential products, in a small number
of patients under the supervision of a qualified physician. Clinical trials are
conducted in accordance with protocols that detail the objectives of the study,
the parameters to be used to monitor safety and the efficacy criteria to be
evaluated. Any product administered in a U.S. clinical trial must be
manufactured in accordance with cGMP. Each protocol is submitted to the FDA as
part of the IND. The protocol for each clinical study must be approved by an
independent Institutional Review Board ("IRB") at the institution at which the
study is conducted and the informed consent of all participants must be
obtained. The IRB will consider, among other things, the existing information on
the product, ethical factors, the safety of human subjects, the potential
benefits of therapy and the possible liability of the institution.
 
    Clinical development is traditionally conducted in three sequential phases.
The phases may overlap, however. In Phase I, products are typically introduced
into healthy human subjects or into selected patient populations to test for
safety (adverse reactions), dosage tolerance, absorption and distribution,
metabolism, excretion and clinical pharmacology. Phase II involves studies in a
limited patient population to (i) determine the efficacy of the product for
specific targeted indications and populations, (ii) determine optimal dosage and
dosage tolerance and (iii) identify possible adverse effects and safety risks.
When a dose is chosen and a candidate product is found to be effective and to
have an acceptable safety profile in Phase II evaluations, Phase III trials are
undertaken to conclusively demonstrate clinical efficacy and to test further for
safety within an expanded patient population, generally at multiple study sites.
The FDA continually reviews the clinical trial plans and results and may suggest
changes or may require discontinuance of the trials at any time if significant
safety issues arise. The results of the preclinical studies and clinical studies
are submitted to the FDA in the form of a marketing approval authorization
application.
 
    The testing and approval process is likely to require substantial time,
effort and expense and there can be no assurance that any FDA approval will be
granted on a timely basis, if at all. The time to approval is affected by a
number of factors, including relative risks and benefits demonstrated in
clinical trials, the availability of alternative treatments and the severity of
the disease. Additional animal studies or clinical trials may be requested
during the FDA review period and may delay marketing approval. After FDA
approval for the initial indications and requisite approval of the manufacturing
facility, further clinical trials may be necessary to gain approval for the use
of the product for additional indications. The FDA may also require unusual or
restrictive post-marketing testing and surveillance to monitor for adverse
effects, which can involve significant expense or grant only conditional
approvals.
 
    Among the conditions for product licensure is the requirement that the
prospective manufacturer's quality control and manufacturing procedures conform
to cGMP. Even after product licensure approval, the manufacturer must comply
with cGMP on a continuing basis, and what constitutes cGMP may change as the
state of the art of manufacturing changes. Domestic manufacturing facilities are
subject to regular FDA inspections for cGMP compliance (normally at least every
two years), and foreign manufacturing facilities are subject to periodic FDA
inspections or inspections by the foreign regulatory authorities with reciprocal
inspection agreements with the FDA. Domestic manufacturing facilities may also
be subject to inspection by foreign authorities.
 
                                       19
<PAGE>
    The Orphan Drug Act provides incentives to drug manufacturers to develop and
manufacture drugs for the treatment of diseases or conditions that affect fewer
than 200,000 individuals in the United States. Orphan drug status can also be
sought for treatments for diseases or conditions that affect more than 200,000
individuals in the United States if the sponsor does not realistically
anticipate its product becoming profitable from sales in the United States. The
Company may apply for orphan drug status for certain of its therapies. Under the
Orphan Drug Act, a manufacturer of a designated orphan product can seek tax
benefits, and the holder of the first FDA approval of a designated orphan
product will be granted a seven-year period of marketing exclusivity in the
United States for that product for the orphan indication. While the marketing
exclusivity of an orphan drug would prevent other sponsors from obtaining
approval of the same compound for the same indication, it would not prevent
other types of products from being approved for the same use including in some
cases, slight variations on the originally designated orphan product.
Legislation has been introduced in the U.S. Congress in the past, and is likely
to be introduced again in the future, that would restrict the extent and
duration of the market exclusivity of an orphan drug, and there can be no
assurance that the benefits of the existing statute will remain in effect.
 
    Export of the Company's investigational products is governed by laws and
regulations administered by the FDA. The Company has sought and received FDA
clearance for export of finished products for clinical trials outside the United
States. However, both the Company's past and future export practices could be
subject to FDA challenge and there can be no assurance that the FDA would agree
that such practices are in compliance with applicable law and regulations or
that such exports would be allowed.
 
    Proposed regulations of the FDA and other governmental agencies would place
restrictions, including disclosure requirements, on researchers who have a
financial interest in the outcome of their research. Under the proposed
regulations, the FDA could also apply heightened scrutiny to, or exclude the
results of, studies conducted by such researchers when reviewing applications to
the FDA which contain such research. Certain of the Company's collaborators have
stock options or other equity interests in the Company that could subject such
collaborators and the Company to the proposed regulations.
 
    There has been increasing regulatory concern about the risks of
xenotransplantation. Certain of these concerns have focused on the use of cells
derived from cows (such as are used in the Company's pain program) and cells
from primates and pigs. The United Kingdom has adopted a moratorium on
xenotransplantation pending further research and discussion; the EC Commission
has introduced a ban on the use of "high-risk material" from cattle and sheep in
the Member States of the European Union in the manufacture of pharmaceuticals
(this ban would apparently not include the type of cells used in the Company's
pain program). In addition, the FDA has recently proposed guidelines which
impose significant constraints on the clinical use of non-human cells. The
regulations proposed, particularly if they are made more restrictive, could
impact significantly on the cost of clinical trials and the cost to manufacture
products using xenogeneic cells; the Company has begun to concentrate on the use
of human cells as opposed to cells derived from non-human animals. Furthermore,
the FDA has published a "Proposed Approach to Regulation of Cellular and
Tissue-Based Products" which relates to the use of human cells. The Company
cannot presently determine the effects of such actions or what other actions
might be taken. Restrictions on the testing or use of cells, whether human or
non-human, as human therapeutics could adversely affect the Company's product
development programs and the Company itself and could prevent the Company from
producing and/or selling certain products or make the cost of production by the
Company prohibitively high.
 
    In addition to safety regulations enforced by the FDA, the Company is also
subject to regulations under the Occupational Safety and Health Act, the
Environmental Protection Act, the Toxic Substances Control Act and other present
and potential future supranational, foreign, Federal, state and local
regulations.
 
    Outside the United States, the Company will be subject to regulations which
govern the import of drug and device products from the United States or other
manufacturing sites and foreign regulatory requirements governing human clinical
trials and marketing approval for its products. The requirements
 
                                       20
<PAGE>
governing the conduct of clinical trials, product licensing, pricing and
reimbursements vary widely from country to country. In particular, the European
Union ("EU") is revising its regulatory approach to high tech products and
representatives from the United States, Japan and the EU are in the process or
harmonizing and making more uniform the regulations for the registration of
pharmaceutical products in these three markets. Although certain of such
proposals have been adopted, the Company cannot anticipate what effect the
adoption of the final forms of this harmonization or the changes to the EU high
tech procedure may have.
 
REIMBURSEMENT AND HEALTH CARE COST CONTROL
 
    The Company's ability to commercialize products successfully may depend in
part on the extent to which reimbursement for the costs of such products and
related treatments will be available from government health administration
authorities, private health insurers and others both in the United States and
abroad. Significant uncertainty exists as to the reimbursement status of newly
approved health care products. Reimbursement limitations or prohibitions with
respect to any product developed by the Company could adversely affect the
Company's ability to establish and maintain price levels sufficient for
realization of an appropriate return on its investment in developing new
therapies. Government and other third-party payers are increasingly attempting
to contain health care costs by limiting both coverage and the level of
reimbursement for new therapeutic products approved for marketing by the FDA and
by refusing, in some cases, to provide any coverage for uses of approved
products for disease indications for which the FDA has not granted marketing
approval. If adequate coverage and reimbursement levels are not provided by
third party payers for uses of the Company's therapeutic products, the market
acceptance of these products would be adversely affected.
 
    The revenues and profitability of health care-related companies may be
affected by the continuing efforts of governmental and third-party payers to
contain or reduce the cost of health care through various means. For example, in
certain foreign markets pricing or profitability of prescription pharmaceuticals
is subject to government control. In the United States, there have been, and the
Company expects that there will continue to be, a number of Federal and state
proposals to implement government control over health care costs. Efforts at
healthcare reform are likely to continue in future legislative sessions. It is
uncertain what legislative proposals will be adopted or what actions Federal,
state or private payers for healthcare goods and services may take in response
to healthcare reform proposals of legislation. The Company cannot predict the
effect healthcare reforms may have on its business. Any such reforms as well as
the uncertainty their proposal engenders could have a material adverse effect on
the Company.
 
EMPLOYEES
 
    As of March 31, 1999, the Company had 82 full-time employees, including 11
employees with Ph.D. or M.D. degrees. Approximately 70 employees work in
research and development, regulatory affairs, prototype manufacturing, quality
assurance and control and laboratory support services. A number of the Company's
employees have held positions with other biotechnology or pharmaceutical
companies or have worked in university research programs. No employees are
covered by collective bargaining agreements.
 
SCIENTIFIC ADVISORY BOARD
 
    Members of the Company's Scientific Advisory Board provide the Company with
strategic guidance in regard to its research and product development programs,
as well as assistance in recruiting employees and collaborators. Each Scientific
Advisory Board member has entered into a consulting agreement with the Company.
These consulting agreements typically specify the compensation to be paid to the
consultant and require that all information about the Company's products and
technology be kept confidential. All of the Scientific Advisory Board members
are employed by employers other than the Company and may have commitments to or
consulting or advising agreements with other entities which may limit their
availability to the Company. The Scientific Advisory Board members have
generally agreed, however, for so long as they serve as consultants to the
Company, not to provide any services to any other entities which would
 
                                       21
<PAGE>
conflict with the services the member provides to the Company. Members of the
Scientific Advisory Board offer consultation on specific issues encountered by
the Company as well as general advice on the directions of appropriate
scientific inquiry for the Company. In addition, certain Scientific Advisory
Board members assist the Company in assessing the appropriateness of moving the
Company's projects to more advanced stages. The following persons are members of
the Company's Scientific Advisory Board:
 
    IRVING L. WEISSMAN, M.D., 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 of SyStemix, Inc., and Chairman
of the Scientific Advisory Board of SyStemix, Inc. He has served on the
Scientific Advisory Boards of Amgen Inc., DNAX and T-Cell Sciences, Inc. Dr.
Weissman is Chairman of the Scientific Advisory Board of CytoTherapeutics.
 
    PATRICK AEBISCHER, M.D., PH.D., is the Director of the Gene Therapy Center
at the Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland and
Professor of Biomaterials, Brown University. He is also Professor of the Swiss
Polytechnical School in Lausanne. Dr. Aebischer is a founding scientist of the
Company and a member of its Board of Directors and Chairman of the Board of
Modex Therapeutiques SA.
 
    DAVID J. ANDERSON, PH.D., is Professor of Biology, California Institute of
Technology, Pasadena, California and Investigator, Howard Hughes Medical
Institute.
 
    ANDERS BJORKLUND, M.D., is Professor, University of Lund, Lund, Sweden.
 
    CONSTANCE L. CEPKO, PH.D., is Professor, Department of Genetics, Harvard
Medical School, Boston, Massachusetts.
 
    FRED H. GAGE, PH.D., is Professor, Laboratory of Genetics, The Salk
Institute for Biological Studies, La Jolla, California and Adjunct Professor,
Department of Neurosciences, University of California, San Diego, California.
 
ITEM 2. PROPERTIES
 
    The Company's research laboratories and administrative offices are located
in a 65,000 square-foot multipurpose building housing wet labs, specialty
research areas and administrative offices located in Lincoln, Rhode Island. The
facilities are leased pursuant to a fifteen-year lease agreement with the
Company having certain renewal options. The Company has also leased a 21,000
square-foot pilot manufacturing facility and a 3,000 square-foot cell processing
facility for its pain program in Lincoln, Rhode Island. This facility was
financed by bonds issued by the Rhode Island Industrial Facilities Corporation.
The Company has also leased additional space near its pilot plant for expanded
research and development. In 1998, the Company entered into a three-year lease
for approximately 6,000 square feet of laboratory space in Sunnyvale,
California.
 
    The Company's current facilities are expected to be sufficient to
accommodate the Company's needs at least past the end of 1999.
 
ITEM 3. LEGAL PROCEEDINGS
 
    None.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
    None.
 
                                       22
<PAGE>
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDERS MATTERS
 
    The Common Stock of CytoTherapeutics is traded on the National Market System
of NASDAQ under the Symbol CTII. The quarterly ranges of high and low sales
prices since January 1, 1996 are shown below:
<TABLE>
<CAPTION>
1999                                                 HIGH         LOW
- -------------------------------------------------- --------    ---------
<S>                                                <C>         <C>
First Quarter (through March 29, 1999)............ $ 1 3/4     $ 1 5/32
 
<CAPTION>
 
1998                                                 HIGH         LOW
- -------------------------------------------------- --------    ---------
<S>                                                <C>         <C>
Fourth Quarter.................................... $ 2 5/32    $   7/8
Third Quarter..................................... $ 1 5/16    $   7/8
Second Quarter.................................... $ 3 7/16    $ 1 1/4
First Quarter..................................... $ 4 3/16    $ 2 9/16
<CAPTION>
 
1997                                                 HIGH         LOW
- -------------------------------------------------- --------    ---------
<S>                                                <C>         <C>
Fourth Quarter.................................... $ 7 1/8     $ 3 11/16
Third Quarter..................................... $ 6 1/8     $ 4 3/4
Second Quarter.................................... $ 8 3/4     $ 4 15/16
First Quarter..................................... $10 7/8     $ 8 3/8
<CAPTION>
 
1996                                                 HIGH         LOW
- -------------------------------------------------- --------    ---------
<S>                                                <C>         <C>
Fourth Quarter.................................... $11         $ 7 5/8
Third Quarter..................................... $12 5/8     $ 7 1/8
Second Quarter.................................... $15 1/2     $10 5/8
First Quarter..................................... $18 3/4     $12 3/4
</TABLE>
 
    No cash dividends have been declared on the Common Stock since the Company's
inception.
 
    As of March 29, 1998, there were approximately 277 holders of record of the
Common Stock.
 
    On December 11, 1996, the Company sold 829,171 shares of Common Stock to
Genentech in connection with the Company's collaboration agreement with
Genentech for $10.01 per share. The shares were issued as a transaction exempt
from registration pursuant to Section 4(2) of the Securities Act of 1933 based
on, among other things, availability of information about the issuer and
representations by the purchaser as to sophistication.
 
                                       23
<PAGE>
ITEM 6. SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
                                                                            YEAR ENDED DECEMBER 31,
                                                             ------------------------------------------------------
<S>                                                          <C>         <C>        <C>        <C>        <C>
                                                                1998       1997       1996       1995       1994
                                                             ----------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                                                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                                          <C>         <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA
Revenue from collaborative agreements......................  $    8,803  $  10,617  $   7,104  $  11,761  $   1,250
Research and development expenses..........................      17,659     18,604     17,130     14,730     13,514
Acquired research and development..........................                  8,344
Net loss...................................................     (12,628)   (18,114)   (13,759)    (8,891)   (16,461)
Basic and diluted net loss per share(1)....................       (0.69)     (1.08)     (0.89)     (0.69)     (1.52)
Shares used in computing basic and diluted net loss per
  share(1).................................................      18,291     16,704     15,430     12,799     10,833
</TABLE>
<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                             -----------------------------------------------------
<S>                                                          <C>        <C>        <C>        <C>        <C>
                                                               1998       1997       1996       1995       1994
                                                             ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
                                                                                (IN THOUSANDS)
<S>                                                          <C>        <C>        <C>        <C>        <C>
Balance Sheet Data
Cash, cash equivalents and marketable securities...........  $  17,386  $  29,050  $  42,607  $  44,192  $  19,138
Total assets...............................................     32,866     44,301     58,397     56,808     32,194
Long-term debt, including capitalized leases...............      3,762      4,108      8,223      5,441      5,641
Redeemable common stock....................................      5,249      5,583      8,159
Stockholders' equity.......................................     17,897     28,900     34,747     45,391     22,637
</TABLE>
 
- ------------------------
 
(1)  See Note 2 to consolidated financial statements.
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
  OF OPERATIONS
 
    The following discussion of the financial condition and results of
operations of CytoTherapeutics, Inc. should be read in conjunction with the
accompanying financial statements and the related footnotes thereto.
 
OVERVIEW
 
    Since its inception in August 1988, the Company has been primarily engaged
in research and development of human therapeutic products. No revenues have been
derived from the sale of any products, and the Company does not expect to
receive revenues from product sales for at least several years. The Company
expects that its research and development expenditures will increase
substantially in future years as research and product development efforts
accelerate and clinical trials are initiated or broadened. The Company has
incurred annual operating losses since inception and expects to incur
substantial operating losses in the future. As a result, the Company is
dependent upon external financing from equity and debt offerings and revenues
from collaborative research arrangements with corporate sponsors to finance its
operations. The Company's results of operations have varied significantly from
year to year and quarter to quarter and may vary significantly in the future due
to the occurrence of material, nonrecurring events, including without
limitation, the receipt of one-time and nonrecurring licensing and milestone
payments.
 
                                       24
<PAGE>
RESULTS OF OPERATIONS
 
YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996
 
    Revenues from collaborative agreements totaled $8,803,000, $10,617,000 and
$7,104,000 for the years ending December 31, 1998, 1997 and 1996, respectively.
Revenues were earned primarily from a Development, Marketing and License
Agreement with Astra AB, which was signed in March 1995. Included in the 1997
revenue is a $3,000,000 milestone payment from Astra related to the Phase II
clinical program for the Company's pain control implant. Revenue for 1998
reflects an increase in funding by more than 20% from Astra.
 
    Research and development expenses totaled $17,659,000 in 1998, as compared
to $18,604,000 in 1997 and $17,130,000 in 1996. The decrease of $945,000, or 5%,
from 1997 to 1998 was primarily attributable to a reduction in spending on
research agreements and a reduction in research and development personnel. The
increase of $1,474,000, or 9%, from 1996 to 1997 was primarily attributable to
an increase in manufacturing supplies associated with Phase II clinical trials
and an additional $917,000 of expense from Modex Therapeutiques SA, the
Company's formerly 50%-owned subsidiary, which was included in the Company's
operating results through October 1997.
 
    Acquired research and development consists of a one-time charge of
$8,344,000 related to the acquisition of StemCells, Inc. in 1997.
Commercialization of the acquired technology will require significant
incremental research expenditures over a number of years.
 
    General and administrative expenses were $4,603,000 for the year ended
December 31, 1998, compared with $6,158,000 in 1997 and $5,679,000 in 1996. The
reduction of $1,555,000, or 25%, from 1997 to 1998 was primarily attributable to
a reduction in legal fees, recruiting and relocation expenses as well as a
reduction in employees. The increase of $479,000, or 8%, from 1996 to 1997 was
primarily attributable to increased spending for legal fees associated with the
NeuroSpheres, Ltd. arbitration, patents, recruiting fees and other professional
services.
 
    Interest income for the years ended December 31, 1998, 1997 and 1996 totaled
$1,254,000, $1,931,000 and $2,260,000, respectively. The average cash and
investment balances were $21,795,000, $33,343,000 and $37,600,000 in 1998, 1997
and 1996, respectively. The decrease in interest income from 1996 to 1997 to
1998 was attributable to lower average balances.
 
    In 1998, interest expense was $472,000, compared with $438,000 in 1997 and
$618,000 in 1996. The Company capitalized $210,000 of interest expense on the
new facility in 1997. The changes in interest expense in 1996, 1997 and 1998 are
primarily attributable to interest capitalization and debt repayment.
 
    In October 1997, the Company recognized a gain in the amount of $3,387,000
related to the sale of 50% of the Company's interest in Modex.
 
    The net loss in 1998, 1997 and 1996 was $12,628,000, $18,114,000, and
$13,759,000, respectively. The loss per share was $0.69, $1.08 and $0.89 in
1998, 1997 and 1996, respectively. The large increase in 1997 is attributable to
a one-time charge of $8,344,000 for acquired research and development related to
the purchase of StemCells, Inc. offset by a gain on partial sale of the
Company's interest in Modex in the amount of $3,387,000.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    Since its inception, the Company has financed its operations through the
sale of common and preferred stock, the issuance of long-term debt and
capitalized lease obligations, revenues from collaborative agreements, research
grants and interest income.
 
    The Company had unrestricted cash, cash equivalents and marketable
securities totaling $17,386,000 at December 31, 1998. Cash equivalents and
marketable securities are invested in agencies of the U.S. government,
investment grade corporate bonds and money market funds.
 
                                       25
<PAGE>
    The Company's liquidity and capital resources have been and will continue to
be significantly affected by the Company's relationships with corporate
partners.
 
    In March 1995, the Company signed a collaborative research and development
agreement with Astra AB for the development and marketing of encapsulated-cell
products to treat pain. Astra made an initial, nonrefundable payment of
$5,000,000, included in revenue from collaborative agreements in 1995, a
milestone payment of $3,000,000 in 1997 and may remit up to an additional
$13,000,000 subject to the achievement of certain development milestones. Under
the agreement, the Company is obligated to conduct certain research and
development pursuant to a four-year research plan agreed upon by the parties.
Over the term of the research plan, the Company expects to receive annual
payments of $5 million to $7 million from Astra, which should approximate the
research and development costs incurred by the Company under the plan. Subject
to successful product development and obtaining necessary regulatory approvals,
Astra is obligated to conduct all clinical trials of products arising from the
collaboration and to seek approval for their sale. Astra has the exclusive
worldwide right to market products covered by the agreement. Until the later of
either expiration of all patents included in the licensed technology or a
specified term, the Company is entitled to a royalty on the worldwide net sales
of such products in return for the marketing license granted to Astra and the
Company's obligation to manufacture and supply products. Astra has the right to
terminate the agreement after April 1, 1998. In May 1998, Astra agreed to
increase annual research and development payments from $7 million to $8.5
million for the calendar year 1998. This increase in funding was recognized as
revenue in the third and fourth quarters of 1998.
 
    The current Phase II pain trial completed patient enrollment in March 1999,
with efficacy data from the trial expected by the third quarter of 1999. Astra
has agreed to fund the first and second quarters of 1999 at the rate of $2.5
million per quarter. Funding for the second half of 1999 is contingent upon,
among other factors, the results of the current Phase II trial. Should Astra
determine to discontinue funding for the Company's development of
encapsulated-cell products to treat pain, or to reduce such funding or otherwise
modify the terms of the Company's relationship with Astra, any such action could
have a material, adverse effect on the Company's liquidity and capital
resources, and, unless other funding sources were obtained, would likely result
in the Company's inability to continue to fund further development of its
proposed encapsulated-cell products.
 
    The Company's liquidity and capital resources will also be affected by the
termination of the Company's collaborative development and licensing agreement
with Genentech, Inc. relating to the development of products for the treatment
of Parkinson's disease. In November 1996, the Company signed collaborative
development and licensing agreements with Genentech relating to the development
of products using the Company's technology to deliver certain of Genentech's
proprietary growth factors to treat Parkinson's disease, Huntington's disease
and amyotrophic lateral sclerosis ("ALS"). Under the terms of the agreement for
Parkinson's disease, Genentech purchased 829,171 shares of the Company's Common
Stock for $8.3 million to fund development of products to treat Parkinson's
disease. Genentech had the right, in its discretion, to terminate the
Parkinson's program at specified milestones in the program. Under the agreement,
if the Parkinson's program was terminated and the funds the Company received
from the sale of stock to Genentech pursuant to the Parkinson's agreement
exceeded the expenses incurred by the Company in connection with such product
development efforts by more than $1 million, Genentech had the right to require
the Company to repurchase from Genentech shares of the Company's Common Stock
having a value equal to the amount of the overfunding, at the same per share
price paid by Genentech ($10.01 per share). As such, a portion of the Common
Stock purchased by Genentech has been classified by the Company as Redeemable
Common Stock; as of December 31, 1998, based upon prior accountability, the
Company classified $5.2 million of such stock as Redeemable Common Stock. On May
21, 1998, Genentech exercised its right to terminate the Parkinson's
collaboration and has requested that the Company redeem, at a price of $10.01
per share, shares of the Company's Common Stock having an aggregate value of at
least $3.1 million. The Company is negotiating with Genentech regarding the
amount of such redemption (which the Company currently expects may be
approximately $3.1 million) and the
 
                                       26
<PAGE>
manner of payment for such redemption. Any such redemption would have a material
adverse effect on the Company's liquidity and capital resources.
 
    In May 1996, the Company secured an equipment loan facility with a bank in
the amount of $2,000,000. The Company has borrowed $2,000,000 under this
agreement as of December 31, 1998. The loan required interest-only payments for
the first two years; principal payments are payable over a two-year period which
began in August 1998. The loan is secured by equipment purchased with the
proceeds of the credit facility. Current balance on this credit facility is
$1.25 million. While the Company was in compliance with financial covenants
under this credit facility as of December 31, 1998, the Company expects that it
will be required to seek a waiver of certain financial covenants under this
facility as of the end of the first or second quarter of 1999; there can be no
assurance that the Company will be able to obtain such a waiver.
 
    In October 1997, the Company completed a series of transactions which
resulted in the establishment of its previously 50%-owned Swiss subsidiary,
Modex Therapeutiques, SA, as an independent company. In the transactions, the
Company reduced its ownership interest from 50% to approximately 25% in exchange
for $4 million cash and elimination of its prior contingent obligation to
contribute an additional Sfr 2.4 million (approximately $1.7 million) to Modex
in July 1998. In the transactions, all of the put and call arrangements between
the Company and other stockholders of Modex were eliminated and the Company
forgave $463,000 due from Modex to the Company. The Company recorded a gain on
the transaction of $3,387,000. In April 1998, Modex completed a financing, in
which the Company elected not to participate, which resulted in a further
reduction of its ownership interest to less than 20%.
 
    The Company and Modex also modified the terms of their existing
royalty-bearing 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, the treatment of hemophilia A and B utilizing Factor VIII and/or
Factor IX and two additional applications to be agreed to by the Company and
Modex; (ii) eliminate the requirement to make future milestone payments to Modex
of up to 300,000 shares of the Company's Common Stock; (iii) limit the scope of
the Company's technology licensed to Modex to existing and future encapsulation
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 the application of
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 investors
participating in the transaction invested $1.6 million directly in Modex.
 
    In September 1997, a merger of the Company's wholly owned subsidiary and
StemCells, Inc., was completed in the form of a purchase. Through the merger,
the Company acquired StemCells for a purchase price totaling approximately
$9,475,000, consisting of 1,580,000 new shares of the Company's Common Stock at
$0.01 par value, valued at $7,900,000, the assumption of certain liabilities of
$934,000 and transaction costs of $641,000. The purchase price was allocated,
through a valuation, to license agreements valued at $1,131,000 to be amortized
over three years and acquired research and development of $8,344,000 which has
been expensed. As part of the acquisition of StemCells, Richard M. Rose, M.D.,
became President, Chief Executive Officer and a Director of CytoTherapeutics;
and Irving Weissman, M.D., became a Director of CytoTherapeutics. Upon
consummation of the merger, the Company entered into consulting arrangements
with the principal scientific founders of StemCells, Dr. Weissman, Fred H. Gage,
Ph.D., and David J. Anderson, Ph.D. Each such scientific founder has joined the
Company's Scientific Advisory Board.
 
                                       27
<PAGE>
    To attract and retain Drs. Rose, Weissman, Gage and Anderson, and to
expedite the progress of the Company's stem cell program, the Company awarded
these individuals options to acquire a total of approximately 1.6 million shares
of the Company's Common Stock, at an exercise price of $5.25 per share.
Approximately 100,000 of these options are exercisable immediately, 1,031,000 of
these options vest and become exercisable only on the achievement of specified
milestones related to the Company's stem cell development program, and the
remaining 469,000 options vest over eight years. If the milestones specified
relating to the 1,031,000 options are achieved, at that time the Company will
record compensation expense for the excess of the quoted market price of the
Common Stock over the exercise price of $5.25 per share for 562,000 options, and
the fair market value for 469,000 of such options determined using the Black-
Scholes method.
 
    Stem cells research will be conducted pursuant to the provisions of an
agreement between the Company and Drs. Weissman and Gage providing for a
two-year research plan. If the goals of the research plan are accomplished, the
Company has agreed to fund continuing stem cells research. Increases in stem
cells research funding of not more than 25% per year will be funded by the
Company (although the Company retains the right to fund such programs at a
higher level) as long as the goals of the research plan are being met, provided,
however, that the Company will retain the option of (i) ceasing or reducing
neural stem cell research even if all research plan goals are met by
accelerating the vesting of all still-achievable performance-based options and
(ii) ceasing or reducing non-neural stem cell research even if all plan goals
are being met by affording the scientific research founders the opportunity to
continue development of the non-neural stem cell research by licensing the
technology related to such research to the founders in exchange for a payment to
the Company equal to all funding for such research, plus royalty payments.
 
    In April 1997, CytoTherapeutics entered into an agreement with NeuroSpheres
Ltd. replacing all previous agreements and resolving its dispute with
NeuroSpheres. The pending action in the United States District Court, its
counterpart actions in Calgary, Alberta, Canada, as well as all arbitration
proceedings, have been discontinued. Under the terms of the settlement, the
Company has an exclusive royalty-bearing license to growth factor-responsive
neural stem/progenitor cells for transplantation. NeuroSpheres had an option to
acquire co-exclusive rights, but failed to exercise the option by the April 1998
deadline. Accordingly, the NeuroSpheres option to acquire co-exclusive rights
has lapsed, and the Company retains exclusive rights for transplantation. The
parties have no further research obligations to each other.
 
    In February 1997, the Company and Cognetix, Inc. entered into a
Collaboration and Development Agreement to screen selected peptides isolated by
Cognetix for possible development into therapeutic products aimed at a broad
range of human disease states using CytoTherapeutics' encapsulated cell-based
delivery technology. The Company and Cognetix have also entered into an option
agreement giving the Company the right to option up to three of Cognetix's
compounds for use in treating eye diseases. As part of the agreement with
Cognetix, CytoTherapeutics had purchased $250,000 of Cognetix preferred stock
and, subject to certain milestones, was obligated to purchase up to a total of
$1,750,000 of Cognetix's stock over the next year. In July 1997, the Company
loaned $250,000 to Cognetix that was repaid with interest in October 1997. In
October 1998, the Company sold the $250,000 of preferred stock back to Cognetix
for $298,914. The Company and Cognetix are presently discussing proposed
revisions to their relationship under the agreements.
 
    Under the terms of the Company's agreements with Genentech entered into in
November 1996 relating to the development of products using the Company's
technology to deliver certain of Genentech's proprietary growth factors to treat
Huntington's disease and ALS, the Company is responsible for conducting and
funding all pre-clinical and clinical development, subject to specified rights
of Genentech to participate in the development and marketing of the proposed
products. Should Genentech share in the development cost of the proposed
products, the Companies will share profits at a negotiated percentage upon
commercialization. Should Genentech elect not to participate in the development,
upon commercialization, the Company will pay Genentech an agreed-upon royalty
based upon sales. Under these agreements, the Company's license to Genentech's
proprietary growth factors is dependent upon the Company using reasonable
efforts to achieve certain development milestones within prescribed periods. The
 
                                       28
<PAGE>
Company does not presently intend to devote significant resources to the
continuing pursuit of these projects and thus does not currently expect to
maintain such licenses.
 
    In both the encapsulated cell and stem cell areas, substantial additional
funds will be required to support the Company's research and development
programs, for acquisition of technologies and intellectual property rights, for
preclinical and clinical testing of its anticipated products, pursuit of
regulatory approvals, acquisition of capital equipment, laboratory and office
facilities, establishment of production capabilities and for general and
administrative expenses. Until the Company's operations generate significant
revenues from product sales, cash reserves and proceeds from equity and debt
offerings, and funding from collaborative arrangements will be used to fund
operations.
 
    The Company intends to pursue opportunities to obtain additional financing
in the future through equity and debt financings, lease agreements related to
capital equipment, grants and collaborative research arrangements. The source,
timing and availability of any future financing will depend principally upon
equity market conditions, interest rates and, more specifically, on the
Company's continued progress in its exploratory, preclinical and clinical
development programs. There can be no assurance that such funds will be
available on favorable terms, if at all.
 
    The Company expects that its existing capital resources, revenues from
collaborative agreements and income earned on invested capital will be
sufficient to fund its operations into the first quarter of 2000. The Company's
cash requirements may vary, however, depending on numerous factors. Lack of
necessary funds may require the Company to delay, scale back or eliminate some
or all of its research and product development programs and/or its capital
expenditures or to license its potential products or technologies to third
parties.
 
YEAR 2000
 
    The year 2000 problem results from the fact that computer programs were
often written using two digits rather than four to define the applicable year.
Computer programs that have date-sensitive software may recognize a date using
"00" as the year 1900 rather than the year 2000. The Company has tested its
material software applications to determine whether each program is prepared to
accommodate date information for the year 2000 and beyond. The Company found all
of its material software programs to be year 2000 compliant and does not
anticipate any significant disruption of its operations as a result of the
failure of any of its software programs to be year 2000 compliant.
 
    The Company is also testing the status of its facilities systems such as
phones, voice mail, heating/air conditioning, electricity and security systems
and its laboratory and manufacturing equipment to determine if they are year
2000 compliant. The Company expects to complete this testing in the third
quarter of 1999. If any of the systems or equipment is found not to be year 2000
compliant, the Company intends to either seek to repair the systems or equipment
to cause it to be year 2000 compliant or replace such systems or equipment with
year 2000 compliant products. The cost to repair or replace any such system or
equipment that is not year 2000 compliant could be material. The Company is also
polling its major vendors and suppliers to determine if they are year 2000
compliant and to identify any potential issues. Each of the suppliers and
vendors that has responded to the Company's inquiry has confirmed either orally
or in writing that it does not believe that its sales of products or provision
of services to the Company will be interrupted as a result of the year 2000
issue. As a result of its investigations, the Company does not currently believe
that it is reasonably likely that its operations will be significantly impacted
by the year 2000 issue. Although the Company believes that the cost of
remediation associated with achieving year 2000 compliance or the costs
associated with systems failures will not be significant, there can be no
assurance that the failure of one or more of the Company's major suppliers to be
year 2000 compliant will not have an adverse effect on the Company's operations
or financial results.
 
                                       29
<PAGE>
ITEM 7A. QUANTITIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
    The Company is exposed to market risk from changes in interest rates with
respect to its investments in marketable securities. Interest rate risk with
respect to the Company short and long-term debt is considered to be immaterial.
 
    The Company maintains an investment portfolio of various issuers, types and
maturities. These securities are classified as available-for-sale, and
consequently, are recorded on the balance sheet at fair value with unrealized
gains or losses reported as accumulated other comprehensive income in
stockholders' equity, net of taxes. At any time, a sharp rise in interest rates
could adversely affect the fair value of the investment portfolio. The Company
currently does not hedge these interest rate exposures.
 
    The table below presents principal amounts and related weighted average
interest rates by year of maturity and fair value for the debt securities
included in the Company's investment portfolio. Such debt securities are
principally fixed rate financial instruments.
 
<TABLE>
<CAPTION>
                                                                                                         FAIR
                                                               1999          2000         TOTAL         VALUE
                                                           ------------  ------------  ------------  ------------
<S>                                                        <C>           <C>           <C>           <C>
Available-for-sale debt securities.......................    10,219,171       501,720    10,720,891    10,715,693
Average interest rate....................................          5.44%         5.61%
</TABLE>
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
                                       30
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
Stockholders and Board of Directors
CytoTherapeutics, Inc.
 
    We have audited the accompanying consolidated balance sheets of
CytoTherapeutics, Inc. as of December 31, 1998 and 1997, and the related
consolidated statements of operations, changes in redeemable common stock and
stockholders' equity, and cash flows for each of the three years in the period
ended December 31, 1998. Our audits also included the financial statement
schedule listed in the Index at Item 14(a). These financial statements and
schedule are the responsibility of the Company's management. Our responsibility
is to express an opinion on these financial statements and schedule based on our
audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
CytoTherapeutics, Inc. at December 31, 1998 and 1997, and the consolidated
results of its operations and its cash flows for each of the three years in the
period ended December 31, 1998, in conformity with generally accepted accounting
principles. Also, in our opinion, the related financial statement schedule, when
considered in relation to the basic financial statements taken as a whole,
presents fairly in all material respects the information set forth therein.
 
                                          Ernst & Young LLP
 
Boston, Massachusetts
February 12, 1999
 
                                       31
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31,
                                                                  -------------------------
                                                                      1998         1997
                                                                  -------------------------
<S>                                                               <C>           <C>
ASSETS
Current assets:
  Cash and cash equivalents.....................................  $  7,864,788  $15,941,701
  Marketable securities.........................................     9,520,939   13,108,497
  Accrued interest receivable...................................       206,609      553,186
  Other current assets..........................................       841,674      576,008
                                                                  -------------------------
Total current assets............................................    18,434,010   30,179,392
Property, plant and equipment, net..............................     8,356,009    7,922,751
Other assets, net...............................................     6,075,663    6,199,323
                                                                  -------------------------
Total assets....................................................    32,865,682  $44,301,466
                                                                  -------------------------
                                                                  -------------------------
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..............................................  $    710,622  $   867,804
  Accrued expenses..............................................     1,020,119    3,241,547
  Deferred revenue..............................................     2,500,000       16,144
  Current maturities of capitalized lease obligations...........       317,083      419,095
  Current maturities of long-term debt..........................     1,000,000      658,986
                                                                  -------------------------
Total current liabilities.......................................     5,547,824    5,203,576
Capitalized lease obligations, less current maturities..........     3,261,667    3,552,500
Long-term debt, less current maturities.........................       500,000      555,525
Deferred rent...................................................       222,673           --
Commitments and contingencies
Redeemable common stock, $.01 par value; 524,337 and 557,754
  shares issued and outstanding at December 31, 1998 and 1997,
  respectively..................................................     5,248,610    5,583,110
Common stock to be issued.......................................       187,500      506,600
Stockholders' equity:
  Convertible preferred stock, $.01 par value; 1,000,000 shares
    authorized; no shares issued and outstanding                            --           --
  Common stock, $.01 par value; 45,000,000 shares authorized;
    17,800,323 and 17,526,220 shares issued and outstanding at
    December 31, 1998 and 1997, respectively....................       178,003      175,262
  Additional paid-in capital....................................   122,861,606  121,472,844
  Accumulated deficit...........................................  (103,664,084) (91,036,254)
  Unrealized gains (losses) on marketable securities............        (5,198)      (8,877)
                                                                  ------------  -----------
  Accumulated other comprehensive income (loss).................  (103,669,282) (91,045,131)
                                                                  ------------  -----------
  Deferred compensation.........................................    (1,472,919)  (1,702,820)
                                                                  -------------------------
Total stockholders' equity......................................    17,897,408   28,900,155
                                                                  -------------------------
Total liabilities and stockholders' equity......................  $ 32,865,682  $44,301,466
                                                                  -------------------------
                                                                  -------------------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                       32
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                              YEAR ENDED DECEMBER 31,
                                                                   ----------------------------------------------
<S>                                                                <C>             <C>             <C>
                                                                        1998            1997            1996
                                                                   --------------  --------------  --------------
Revenue from collaborative agreements............................  $    8,803,163  $   10,617,443  $    7,104,284
Operating expenses:
  Research and development.......................................      17,658,530      18,603,523      17,130,392
  Acquired research and development..............................              --       8,343,684              --
  General and administrative.....................................       4,602,758       6,158,410       5,678,783
                                                                   ----------------------------------------------
                                                                       22,261,288      33,105,617      22,809,175
                                                                   ----------------------------------------------
LOSS FROM OPERATIONS.............................................     (13,458,125)    (22,488,174)    (15,704,891)
Other income (expense):
  Interest income................................................       1,253,781       1,931,260       2,259,886
  Interest expense...............................................        (472,400)       (437,991)       (618,213)
  Gain on partial sale of Modex..................................              --       3,386,808              --
  Loss on sale/leaseback.........................................              --        (342,014)             --
  Loss on equity investment......................................              --        (105,931)             --
  Other income (expense).........................................          48,914         (57,538)        404,128
  Currency exchange loss.........................................              --              --        (100,048)
                                                                   ----------------------------------------------
                                                                          830,295       4,374,594       1,945,753
                                                                   ----------------------------------------------
NET LOSS.........................................................  $  (12,627,830) $  (18,113,580) $  (13,759,138)
                                                                   ----------------------------------------------
                                                                   ----------------------------------------------
BASIC AND DILUTED NET LOSS PER SHARE.............................  $         (.69) $        (1.08) $         (.89)
                                                                   ----------------------------------------------
                                                                   ----------------------------------------------
SHARES USED IN COMPUTING BASIC AND DILUTED NET LOSS PER SHARE....      18,290,548      16,704,144      15,429,564
                                                                   ----------------------------------------------
                                                                   ----------------------------------------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                       33
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE COMMON STOCK AND STOCKHOLDERS'
                                     EQUITY
<TABLE>
<CAPTION>
                             REDEEMABLE                                                                  UNREALIZED
                            COMMON STOCK             COMMON STOCK        ADDITIONAL                    GAINS (LOSSES)  CUMULATIVE
                       -----------------------  ----------------------     PAID-IN      ACCUMULATED    ON MARKETABLE   TRANSLATION
                        SHARES       AMOUNT       SHARES      AMOUNT       CAPITAL        DEFICIT        SECURITIES    ADJUSTMENTS
                       ---------  ------------  -----------  ---------  -------------  --------------  --------------  -----------
<S>                    <C>        <C>           <C>          <C>        <C>            <C>             <C>             <C>
Balances, January 1,
  1996...............     --      $    --        15,176,997  $ 151,770  $ 104,271,658  $  (59,163,536)  $    131,486    $  --
Issuance of common
  stock..............     --           --           168,260      1,683      1,526,118        --              --            --
Issuance of common
  stock under the
  stock purchase
  plan...............     --           --            18,338        184        140,557        --              --            --
Exercise of
  warrants...........     --           --             6,128         61            (61)       --              --            --
Issuance of common
  stock to
  consultants and
  employees..........     --           --            48,700        487        429,079        --              --            --
Common stock issued
  pursuant to
  employee benefit
  plan...............     --           --            13,719        137        162,231        --              --            --
Issuance of
  redeemable common
  stock..............    829,171     8,300,000      --          --           --              --              --            --
Redeemable common
  stock lapses.......    (14,106)     (141,202)      14,106        141        141,061        --              --            --
Exercise of stock
  options............     --           --           168,085      1,681        979,016        --              --            --
Amortization of
  deferred
  compensation.......     --           --           --          --           --              --              --            --
Change in unrealized
  losses on
  marketable
  securities.........     --           --           --          --           --              --             (116,726)      --
Change in cumulative
  translation
  adjustment.........     --           --           --          --           --              --              --           (60,416)
Net loss.............     --           --           --          --           --           (13,759,138)       --            --
Comprehensive income
  (loss).............
                       -----------------------------------------------------------------------------------------------------------
Balances, December
  31, 1996...........    815,065     8,158,798   15,614,333    156,144    107,649,659     (72,922,674)        14,760      (60,416)
 
<CAPTION>
 
                                          TOTAL
                         DEFERRED     STOCKHOLDERS'
                       COMPENSATION      EQUITY
                       -------------  -------------
<S>                    <C>            <C>
Balances, January 1,
  1996...............   $   --        $  45,391,378
Issuance of common
  stock..............       --            1,527,801
Issuance of common
  stock under the
  stock purchase
  plan...............       --              140,741
Exercise of
  warrants...........       --             --
Issuance of common
  stock to
  consultants and
  employees..........      (185,201)        244,365
Common stock issued
  pursuant to
  employee benefit
  plan...............       --              162,368
Issuance of
  redeemable common
  stock..............       --             --
Redeemable common
  stock lapses.......       --              141,202
Exercise of stock
  options............       --              980,697
Amortization of
  deferred
  compensation.......        95,083          95,083
Change in unrealized
  losses on
  marketable
  securities.........       --             (116,726)
Change in cumulative
  translation
  adjustment.........       --              (60,416)
Net loss.............       --          (13,759,138)
                                      -------------
Comprehensive income
  (loss).............                   (13,936,280)
 
Balances, December
  31, 1996...........       (90,118)     34,747,355
</TABLE>
 
                                       34
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE COMMON STOCK AND STOCKHOLDERS'
                               EQUITY (CONTINUED)
<TABLE>
<CAPTION>
                                                                                             UNREALIZED
                                                                                               GAINS
                          REDEEMABLE                                                          (LOSSES)
                         COMMON STOCK           COMMON STOCK      ADDITIONAL                     ON       CUMULATIVE
                     ---------------------  --------------------    PAID-IN    ACCUMULATED   MARKETABLE   TRANSLATION   DEFERRED
                      SHARES      AMOUNT     SHARES     AMOUNT      CAPITAL      DEFICIT     SECURITIES   ADJUSTMENTS  COMPENSATION
                     -------------------------------------------------------------------------------------------------------------
<S>                  <C>        <C>         <C>        <C>        <C>          <C>          <C>           <C>          <C>
Issuance of common
  stock............     --          --        307,548      3,074    1,552,432      --           --            --           --
Issuance of common
  stock under the
  stock purchase
  plan.............     --          --         31,822        319      180,103      --           --            --           --
Deferred
  compensation
  recorded in
  connection with
  the granting of
  stock options....     --          --         --         --        1,750,000      --           --            --       (1,750,000)
Common stock issued
  pursuant to
  employee benefit
  plan.............     --          --         25,588        256      169,196      --           --            --           --
Issuance of common
 stock--StemCells..     --          --      1,219,381     12,194    7,381,206      --           --            --           --
Redeemable common
  stock lapses.....   (257,311) (2,575,688)   257,311      2,573    2,573,115      --           --            --           --
Exercise of stock
  options..........     --          --         75,237        752      244,427      --           --            --           --
Deferred
  compensation--
  amortization and
  cancellations....     --          --         (5,000)       (50)     (27,294)     --           --            --          137,298
Change in
  unrealized losses
  on marketable
  securities.......     --          --         --         --          --           --           (23,637 )     --           --
Change in
  cumulative
  translation
  adjustment.......     --          --         --         --          --           --           --            60,416       --
Net loss...........     --          --         --         --          --       (18,113,580)     --            --           --
Comprehensive
  income (loss)....
                     -------------------------------------------------------------------------------------------------------------
Balances, December
  31, 1997.........    557,754   5,583,110  17,526,220   175,262  121,472,844  (91,036,254)      (8,877 )     --       (1,702,820)
 
<CAPTION>
 
                        TOTAL
                     STOCKHOLDERS'
                       EQUITY
 
<S>                  <C>
Issuance of common
  stock............    1,555,506
Issuance of common
  stock under the
  stock purchase
  plan.............      180,422
Deferred
  compensation
  recorded in
  connection with
  the granting of
  stock options....      --
Common stock issued
  pursuant to
  employee benefit
  plan.............      169,452
Issuance of common
 stock--StemCells..    7,393,400
Redeemable common
  stock lapses.....    2,575,688
Exercise of stock
  options..........      245,179
Deferred
  compensation--
  amortization and
  cancellations....      109,954
Change in
  unrealized losses
  on marketable
  securities.......      (23,637)
Change in
  cumulative
  translation
  adjustment.......       60,416
Net loss...........  (18,113,580)
                     -----------
Comprehensive
  income (loss)....  (18,076,801)
 
Balances, December
  31, 1997.........   28,900,155
</TABLE>
 
                                       35
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE COMMON STOCK AND STOCKHOLDERS'
                               EQUITY (CONTINUED)
<TABLE>
<CAPTION>
                                                                                                        UNREALIZED
                                                                                                          GAINS
                                    REDEEMABLE                                                           (LOSSES)
                                   COMMON STOCK           COMMON STOCK      ADDITIONAL                      ON
                               ---------------------  --------------------    PAID-IN    ACCUMULATED    MARKETABLE    DEFERRED
                                SHARES      AMOUNT     SHARES     AMOUNT      CAPITAL      DEFICIT      SECURITIES   COMPENSATION
                               -------------------------------------------------------------------------------------------------
<S>                            <C>        <C>         <C>        <C>        <C>          <C>           <C>           <C>
Issuance of common stock
  under the stock purchase
  plan.......................     --          --         43,542        436       83,622
Common stock issued pursuant
  to employee benefit plan...     --          --         84,812        848      143,025       --           --            --
Issuance of common stock--
  StemCells..................     --          --        101,320      1,013      505,587       --           --            --
Redeemable common stock
  lapses.....................    (33,417)   (334,500)    33,417        334      334,166       --           --            --
Exercise of stock options....     --          --         11,012        110        1,254       --           --            --
Deferred compensation--
  amortization and
  cancellations..............     --          --         --         --          321,108       --           --           229,901
Change in unrealized losses
  on marketable securities...     --          --         --         --          --            --             3,679       --
Net loss.....................     --          --         --         --          --        (12,627,830)     --            --
Comprehensive income (loss)
                               -------------------------------------------------------------------------------------------------
Balances, December 31,
  1998.......................    524,337  $5,248,610  17,800,323 $ 178,003  $122,861,606 $(103,664,084) $    (5,198 ) $(1,472,919)
                               -------------------------------------------------------------------------------------------------
                               -------------------------------------------------------------------------------------------------
 
<CAPTION>
                                  TOTAL
                               STOCKHOLDERS'
                                 EQUITY
<S>                            <C>
Issuance of common stock
  under the stock purchase
  plan.......................       84,058
Common stock issued pursuant
  to employee benefit plan...      143,873
Issuance of common stock--
  StemCells..................      506,600
Redeemable common stock
  lapses.....................      334,500
Exercise of stock options....        1,364
Deferred compensation--
  amortization and
  cancellations..............      551,009
Change in unrealized losses
  on marketable securities...        3,679
Net loss.....................  (12,627,830)
                               -----------
Comprehensive income (loss)    (12,624,151)
Balances, December 31,
  1998.......................  $17,897,408
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                       36
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,
                                                   -------------------------------------
<S>                                                <C>          <C>          <C>
                                                      1998         1997         1996
                                                   -----------  -----------  -----------
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss.........................................  $(12,627,830) $(18,113,580) $(13,759,138)
Adjustments to reconcile net loss to net cash
  used for operating activities:
  Depreciation and amortization..................    2,244,146    1,968,234    1,671,068
  Acquired research and development..............           --    8,343,684           --
  Amortization of deferred compensation..........      551,009      109,954       95,083
  Other non cash charges.........................      410,173      105,931      406,733
  Loss (gain) on investment......................           --   (3,386,808)          --
  Loss on sale of fixed assets...................           --      413,856          871
  Changes in operating assets and liabilities:
    Accrued interest receivable..................      346,577      100,004      140,025
    Other current assets.........................     (265,665)    (232,604)     220,688
    Accounts payable and accrued expenses........   (2,378,613)  (1,233,501)   1,077,350
    Deferred revenue.............................    2,483,856   (1,842,948)     109,092
                                                   -------------------------------------
NET CASH USED IN OPERATING ACTIVITIES............   (9,236,347) (13,767,778) (10,038,228)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of Modex, net of cash
  disposed.......................................           --    2,958,199           --
Purchases of marketable securities...............  (18,982,387) (14,182,521)  (3,083,621)
Proceeds from sales of marketable securities.....   22,573,624   23,736,242   14,924,200
Purchase of property, plant and equipment........   (2,153,524)  (7,710,126)  (4,412,190)
Proceeds on sale of fixed assets.................           --    8,003,926        3,000
Purchase of other investment.....................           --     (250,000)          --
Acquisition of other assets......................     (400,219)  (1,599,418)    (811,305)
StemCells assets acquired........................           --     (640,490)          --
Advance to Cognetix..............................           --      250,000           --
Repayment from Cognetix..........................           --     (250,000)          --
                                                   -------------------------------------
NET CASH PROVIDED BY (USED IN) INVESTING
  ACTIVITIES.....................................    1,037,494   10,315,812    6,620,084
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of redeemable common
  stock..........................................           --           --    8,300,000
Proceeds from issuance of common stock...........      227,931    1,905,380    1,668,542
Proceeds from the exercise of stock options and
  warrants.......................................        1,364      245,179      980,697
Proceeds from debt financings....................    1,259,300           --    4,059,947
Repayments of debt and lease obligations.........   (1,366,655)  (2,496,849)  (1,171,926)
                                                   -------------------------------------
NET CASH PROVIDED BY (USED IN) FINANCING
  ACTIVITIES.....................................      121,940     (346,290)  13,837,260
Effect of exchange rate on cash and cash
  equivalents....................................           --     (181,627)     (46,111)
                                                   -------------------------------------
INCREASE (DECREASE) IN CASH AND CASH
  EQUIVALENTS....................................   (8,076,913)  (3,979,883)  10,373,005
Cash and cash equivalents, January 1.............   15,941,701   19,921,584    9,548,579
                                                   -------------------------------------
CASH AND CASH EQUIVALENTS, DECEMBER 31...........  $ 7,864,788  $15,941,701  $19,921,584
                                                   -------------------------------------
                                                   -------------------------------------
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
INTEREST PAID....................................  $   444,047  $   436,461  $   616,671
</TABLE>
 
Non-cash: During 1998, the Company issued 101,320 shares of common stock to
liquidate a common stock liability.
 
          See accompanying notes to consolidated financial statements.
 
                                       37
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
                  NOTES TO CONSOLIDATED FINANACIAL STATEMENTS
 
                               DECEMBER 31, 1998
 
1. NATURE OF BUSINESS
 
    CytoTherapeutics, Inc. (the "Company") is a biopharmaceutical company
engaged in the development of cell-based therapeutics designed to deliver
therapeutic substances to the central nervous system or regenerate damaged
tissue.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRINCIPLES OF CONSOLIDATION
 
    The 1998 and 1997 consolidated financial statements include accounts of the
Company and StemCells, Inc., a wholly owned subsidiary. The 1996 consolidated
financial statements include accounts of the Company and Modex Therapeutiques
S.A., a 50%-owned subsidiary. Significant intercompany accounts have been
eliminated in consolidation.
 
USE OF ESTIMATES
 
    The preparation of the consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in the consolidated financial
statements and accompanying notes. Actual results could differ from those
estimates.
 
CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
 
    Cash and cash equivalents include funds held in investments with original
maturities of three months or less. The Company's policy regarding selection of
investments, pending their use, is to insure safety, liquidity, and capital
preservation while obtaining a reasonable rate of return. Marketable securities
consist of investments in agencies of the U.S. government, investment grade
corporate notes and money market funds. The fair values for marketable
securities are based on quoted market prices.
 
    The Company determines the appropriate classification of cash equivalents
and marketable securities at the time of purchase and reevaluates such
designation as of each balance sheet date. The Company has classified such
holdings as available-for-sale securities, which are carried at fair value, with
unrealized gains and losses reported as a separate component of stockholders'
equity.
 
PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment, including that held under capitalized lease
obligations, is stated at cost and depreciated using the straight-line method
over the estimated life of the respective asset, as follows:
 
<TABLE>
<S>                                                              <C>
Building and improvements......................................  3-15 years
Machinery and equipment........................................  3-10 years
Furniture and fixtures.........................................  3-10 years
</TABLE>
 
PATENT COSTS
 
    The Company capitalizes certain patent costs related to patent applications.
Accumulated costs are amortized over the estimated economic life of the patents,
not to exceed 17 years, using the straight-line method, commencing at the time
the patent is issued. Costs related to patent applications are written off to
 
                                       38
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
expense at the time such patents are deemed to have no continuing value. At
December 31, 1998 and 1997, total costs capitalized were $4,285,000 and
$3,486,000 and the related accumulated amortization was $347,000 and $208,000,
respectively. Patent expense totaled $3,000, $365,000, and $249,000 in 1998,
1997 and 1996, respectively.
 
STOCK BASED COMPENSATION
 
    The Company grants qualified stock options for a fixed number of shares to
employees with an exercise price equal to the fair market value of the shares at
the date of grant. The Company accounts for stock option grants in accordance
with APB Opinion No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES, and,
accordingly, recognizes no compensation expense for qualified stock option
grants.
 
    For certain non-qualified stock options granted, the Company recognizes as
compensation expense the excess of the deemed fair value of the common stock
issuable upon exercise of such options over the aggregate exercise price of such
options. The compensation is amortized over the vesting period of each option or
the recipient's term of employment, if shorter.
 
INCOME TAXES
 
    The liability method is used to account for income taxes. Deferred tax
assets and liabilities are determined based on differences between financial
reporting and income tax bases of assets and liabilities as well as net
operating loss carryforwards and are measured using the enacted tax rates and
laws that are expected to be in effect when the differences reverse. Deferred
tax assets may be reduced by a valuation allowance to reflect the uncertainty
associated with their ultimate realization.
 
REVENUE FROM COLLABORATIVE AGREEMENTS
 
    Revenues from collaborative agreements are recognized as earned upon either
the incurrence of reimbursable expenses or the achievement of certain
milestones. Payments received in advance of research performed are designated as
deferred revenue. Substantially all of the Company's revenues and all of the
Company's long-lived assets attribute to research performed in the United
States; the Company derives significant revenues from its collaboration with
Astra AB, a company head-quartered in Sweden (See Note 15).
 
FOREIGN CURRENCY TRANSLATION
 
    Prior to the sale of a majority ownership position in Modex, assets and
liabilities of operations outside the United States are translated into United
States dollars using current exchange rates; revenue and expense items are
translated into United Stated dollars using a weighted average exchange rate for
the period. The gains and losses resulting from such translation are accumulated
as a separate component of shareholders' equity, whereas gains and losses
resulting from foreign currency transactions generally are included in results
of operations.
 
                                       39
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
NET LOSS PER SHARE
 
    Net loss per share is computed using the weighted average number of shares
of common stock outstanding. Common equivalent shares from stock options and
warrants are excluded, as their effect is antidilutive.
 
    In 1997, the Company adopted Statement of Accounting Standards No. 128,
EARNINGS PER SHARE (EPS), which is effective for both interim and annual
financial statements for periods ended after December 15, 1997. Under Statement
128, primary EPS computed in accordance with Opinion 15 has been replaced with a
simpler calculation called basic EPS. Basic EPS is calculated by dividing income
available to common stockholders by the weighted average common shares
outstanding. Fully dilutive EPS did not change significantly but has been
renamed diluted EPS. The adoption of Statement 128 had no effect on the
Company's financial statements since common equivalent shares from stock options
and warrants have been excluded as their effect is antidilutive.
 
IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
    As of January 1, 1998, the Company adopted Statement 130, REPORTING
COMPREHENSIVE INCOME. Statement 130 establishes new rules for the reporting and
display of comprehensive income and its components; however, the adoption of
this Statement had no impact on the Company's net income or shareholders'
equity. Statement 130 requires unrealized gains or losses on the Company's
available-for-sale securities and the foreign currency translation adjustments,
which prior to adoption were reported separately in shareholders' equity, to be
included in other comprehensive income. Prior year financial statements have
been reclassified to conform to the requirements of Statement 130.
 
    Effective January 1, 1998, the Company adopted the Financial Accounting
Standards Board's Statement of Financial Accounting Standards No. 131,
DISCLOSURES ABOUT SEGMENTS OF AN ENTERPRISE AND RELATED INFORMATION (Statement
131). Statement 131 superseded FASB Statement No. 14, Financial Reporting for
Segments of a Business Enterprise. Statement 131 establishes standards for the
way that public business enterprises report information about operating segments
in annual financial statements and requires that those enterprises report
selected information about operating segments in interim financial reports.
Statement 131 also establishes standards for related disclosures about products
and services, geographic areas, and major customers. Inasmuch as the Company's
activities are all directed toward research and development of cell-based
therapeutic projects that have similar basic and economic characteristics, the
Company believes that aggregation of all such projects is consistant with the
objectives and basic principles of Statement 131.
 
3. STEMCELLS, INC.
 
    In September 1997, a merger of a wholly owned subsidiary of the Company and
StemCells, Inc. was completed in the form of a purchase. Through the merger, the
Company acquired StemCells for a purchase price totaling approximately
$9,475,000, consisting of 1,320,691 shares of the Company's common stock and
options and warrants for the purchase of 259,296 common shares at nominal
consideration, valued at $7,900,000 in the aggregate, the assumption of certain
liabilities of $934,000 and transaction costs of $641,000. The purchase price
was allocated, based upon a valuation, to license agreements valued at
$1,131,000 to be amortized over three years and acquired research and
development of $8,344,000 which
 
                                       40
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
3. STEMCELLS, INC. (CONTINUED)
has been expensed. As part of the acquisition of StemCells, Richard M. Rose,
M.D., became President, a Chief Executive Officer and a director of the Company,
and Irving L. Weissman, M.D. became a director of the Company.
 
    Upon consummation of the merger, the Company entered into consulting
arrangements with the principal scientific founders of StemCells: Dr. Irving
Weissman, Fred H. Gage, Ph.D. and David Anderson, Ph.D. Additionally, in
connection with the merger, the Company was granted an option by the former
shareholders of StemCells to repurchase 500,000 of the Company's shares of
Common Stock exchanged for StemCells shares, upon the occurrence of certain
events as defined.
 
    To attract and retain Drs. Rose, Weissman, Gage and Anderson, and to
expedite the progress of the Company's stem cell program, the Company awarded
these individuals options to acquire a total of approximately 1.6 million shares
of the Company's Common Stock, at an exercise price of $5.25 per share, the
quoted market price at the grant date; approximately 100,000 of these options
are exercisable immediately, 1,031,000 of these options vest and become
exercisable only upon the achievement of specified milestones related to the
Company's stem cell development program and the remaining 469,000 options vest
over eight years. In connection with the 469,000 options issued to a
non-employee, Dr. Anderson, the Company has recorded deferred compensation of
$1,750,000, the fair value of such options at the date of grant, which will be
amortized over an eight-year period. If the milestones specified relating to the
1,031,000 option grant are achieved, at that time the Company will record
compensation expense for the excess of the quoted market price of the common
stock over the exercise price of $5.25 per share for 562,000 options and the
fair market value for 469,000 of such options determined using the Black-Scholes
method. The Company has also designated a pool of 400,000 options to be granted
to persons in a position to make a significant contribution to the success of
the stem cell program. Stem cell research will be conducted pursuant to the
provisions of an agreement between the Company and Drs. Weissman and Gage
providing for a two-year research plan. If the goals of the research plan are
accomplished, the Company has agreed to fund continuing stem cell research.
Increases in stem cells research funding of not more than 25% a year will be
funded by the Company as long as the goals of the research plan are being met.
However, the Company will retain the option of (i) ceasing or reducing neural
stem cell research even if all research plan goals are met but will be required
to accelerate the vesting of all still-achievable performance based stock
options, and (ii) ceasing or reducing non-neural stem cell research even if all
plan goals are being met by affording the scientific research founders the
opportunity to continue development of the non-neural stem cell research by
licensing the technology related to such research to the founders in exchange
for a payment to the Company equal to all prior Company funding for such
research, plus royalty payments.
 
4. MODEX
 
    In October 1997, the Company completed a series of transactions which
resulted in the establishment of its previously 50%-owned Swiss subsidiary,
Modex Therapeutiques, S.A. (Modex), as an independent company. In the
transactions, the Company reduced its ownership interest from 50% to
approximately 25% in exchange for $4 million cash and elimination of its prior
contingent obligation to contribute an additional Sfr 2.4 million (approximately
$1.7 million) to Modex in July 1998. In the transactions, all of the put and
call arrangements between the Company and other stockholders of Modex were
eliminated and the Company forgave $463,000 due from Modex to the Company. The
Company recorded a gain on the
 
                                       41
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
4. MODEX (CONTINUED)
transactions of $3,387,000 and accounted for its now approximately 25%
investment under the equity method.
 
    In April 1998, Modex completed an additional equity offering, in which the
Company did not participate. This resulted in a reduction in the Company's
ownership interest to less than 20%; therefore, the Company began to account for
this investment under the cost method.
 
    The Company and Modex also modified the terms of their existing
royalty-bearing 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, the treatment of hemophilia A and B utilizing Factor VIII and/or
Factor IX and two additional applications to be agreed to by the Company and
Modex; (ii) eliminate the requirement to make future milestone payments to Modex
of up to 300,000 shares of the Company's common stock; (iii) limit the scope of
the Company's technology licensed to Modex to existing and future encapsulation
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 the application of
diseases, conditions and disorders of the central nervous system to existing and
future encapsulation technology and certain additional existing technology.
 
                                       42
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
5. MARKETABLE SECURITIES
 
    The following is a summary of available-for-sale securities:
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31, 1998
                                                 -----------------------------------------------------------------
<S>                                              <C>            <C>                <C>               <C>
                                                                GROSS UNREALIZED   GROSS UNREALIZED    ESTIMATED
                                                     COST             GAINS             LOSSES        FAIR VALUE
                                                 -----------------------------------------------------------------
U.S. government securities.....................  $   1,500,994  $        1,720     $         (504  ) $   1,502,210
U.S. corporate securities......................      9,225,095           3,244             (9,658  )     9,218,681
                                                 -----------------------------------------------------------------
Total debt securities..........................  $  10,726,089  $        4,964     $      (10,162  )    10,720,891
                                                 --------------------------------------------------
                                                 --------------------------------------------------
Debt securities included in cash and cash
  equivalents..................................                                                         (1,199,952)
                                                                                                     -------------
                                                                                                     -------------
Debt securities included in marketable
  securities...................................                                                      $   9,520,939
                                                                                                     -------------
                                                                                                     -------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31, 1997
                                                ------------------------------------------------------------------
<S>                                             <C>            <C>                <C>               <C>
                                                               GROSS UNREALIZED   GROSS UNREALIZED    ESTIMATED
                                                    COST             GAINS             LOSSES         FAIR VALUE
                                                ------------------------------------------------------------------
U.S. government securities....................  $   3,153,834  $           92     $       (3,951  ) $    3,149,975
U.S. corporate securities.....................     21,261,850           1,645             (6,663  )     21,256,832
                                                ------------------------------------------------------------------
Total debt securities.........................  $  24,415,684  $        1,737     $      (10,614  )     24,406,807
                                                --------------------------------------------------
                                                --------------------------------------------------
Debt securities included in cash and cash
  equivalents.................................                                                         (11,298,310)
                                                                                                    --------------
                                                                                                    --------------
Debt securities included in marketable
  securities..................................                                                      $   13,108,497
                                                                                                    --------------
                                                                                                    --------------
</TABLE>
 
    Maturities of marketable securities held at December 31, 1998, are as
follows:
 
<TABLE>
<S>                                                                              <C>
Less than one year.............................................................  $10,219,171
One through five years.........................................................     501,720
                                                                                 ----------
                                                                                 $10,720,891
                                                                                 ----------
                                                                                 ----------
</TABLE>
 
6. OTHER INVESTMENT
 
    In December 1993, the Company sold substantially all of the assets of its
primary cell diabetes product development program, including related equipment,
and licensed related intellectual property to Neocrin Company in exchange for
preferred stock representing a then 10% ownership interest with a fair market
value of $2,030,748. The transaction resulted in a gain before closing expenses
of $1,957,913 and a net gain of $1,780,209. In February 1995, the Company
purchased an additional $500,100 of Neocrin's preferred stock at the current
market value, as required under the original purchase agreement.
 
                                       43
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
6. OTHER INVESTMENT (CONTINUED)
    In December 1995, Neocrin completed an equity offering in which the Company
did not participate, at a valuation substantially lower than prior financings.
As a result, the Company determined that the carrying value in its investment
had been permanently impaired and provided a $2,530,848 valuation reserve to
reduce the investment value to zero.
 
7. PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment consists of the following:
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31,
                                                                 ----------------------------
<S>                                                              <C>            <C>
                                                                     1998           1997
                                                                 -------------  -------------
Land...........................................................  $          --  $          --
Building and improvements......................................      5,665,077      4,977,906
Machinery and equipment........................................      9,887,251      8,549,405
Furniture and fixtures.........................................        869,831        717,377
Construction in progress.......................................             --         23,947
                                                                 -------------  -------------
                                                                    16,422,159     14,268,635
Less accumulated depreciation and amortization.................      8,066,150      6,345,884
                                                                 -------------  -------------
                                                                 $   8,356,009  $   7,922,751
                                                                 -------------  -------------
                                                                 -------------  -------------
</TABLE>
 
    Depreciation and amortization expense was $1,720,000, $1,778,000, and
$1,564,000 for the years ending December 31, 1998, 1997 and 1996, respectively.
 
    Certain property, plant and equipment have been acquired under capitalized
lease obligations. These assets totaled $6,587,000, at December 31, 1998 and
1997 with related accumulated amortization of $2,860,000 and $2,297,000 at
December 31, 1998 and 1997, respectively.
 
    In connection with the Company's new facility, the Company capitalized
$210,000 of interest costs in 1997.
 
                                       44
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
8. OTHER ASSETS
 
    Other assets are as follows:
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                    --------------------------
<S>                                                                 <C>           <C>
                                                                        1998          1997
                                                                    ------------  ------------
Patents, net......................................................  $  3,938,755  $  3,278,709
License agreements, net...........................................       659,750     1,036,750
Security deposit--building lease..................................       750,000       750,000
Restricted cash...................................................       603,457       552,357
Other investments.................................................            --       450,000
Deferred financing costs, net.....................................       123,701       131,507
                                                                    ------------  ------------
                                                                    $  6,075,663  $  6,199,323
                                                                    ------------  ------------
                                                                    ------------  ------------
</TABLE>
 
    At December 31, 1998 and 1997, accumulated amortization was $818,000 and
$302,000, respectively, for patents and license agreements.
 
9. ACCRUED EXPENSES
 
    Accrued expenses are as follows:
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                    --------------------------
<S>                                                                 <C>           <C>
                                                                        1998          1997
                                                                    ------------  ------------
External services.................................................  $    412,253  $  1,709,818
Employee compensation.............................................       262,679       755,951
Collaborative research............................................       196,505       499,575
Other.............................................................       148,682       276,203
                                                                    ------------  ------------
                                                                    $  1,020,119  $  3,241,547
                                                                    ------------  ------------
                                                                    ------------  ------------
</TABLE>
 
10. LEASES
 
    The Company has undertaken direct financing transactions with the State of
Rhode Island and received proceeds from the issuance of industrial revenue bonds
totaling $5,000,000 to finance the construction of its pilot manufacturing
facility. The related leases are structured such that lease payments will fully
fund all semiannual interest payments and annual principal payments through
maturity in August 2014. Fixed interest rates vary with the respective bonds'
maturities, ranging from 5.1% to 9.5%. The bonds contain certain restrictive
covenants which limit, among other things, the payment of cash dividends and the
sale of assets. In addition, the Company is required to maintain a debt service
reserve, which totals $583,000, until December 1999.
 
    In 1997, the Company completed construction of a new headquarters and
laboratory facility. In November 1997, the Company entered into sale and
leaseback agreement with a real estate investment trust. Under the terms of
these agreements, the Company sold its new facility for $8,000,000 incurring a
$342,000 loss on the sale. The Company simultaneously entered into a
fifteen-year lease for the facility. The lease agreement calls for minimum rent
of $750,000 for the first five years, $937,500 for years six to ten, $1,171,900
for years eleven to fourteen and $1,465,000 in year fifteen with a $750,000
security deposit
 
                                       45
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
10. LEASES (CONTINUED)
held for the term of the lease. The Company is recognizing rent expense on a
straight line basis. At December 31, 1998, the Company has incurred $223,000 in
deferred rent expense. Future minimum capitalized lease obligations with
noncancelable terms in excess of one year at December 31, 1998, are as follows:
 
<TABLE>
<S>                                                               <C>
1999............................................................  $ 623,614
2000............................................................    606,684
2001............................................................    589,217
2002............................................................    519,719
2003............................................................    436,909
Thereafter......................................................  3,150,294
                                                                  ---------
Total minimum lease payments....................................  5,926,437
Less amounts representing interest..............................  2,347,687
                                                                  ---------
Present value of minimum lease payments.........................  3,578,750
Less current maturities.........................................    317,083
                                                                  ---------
Capitalized lease obligations, less current maturities..........  $3,261,667
                                                                  ---------
                                                                  ---------
</TABLE>
 
    Rent expense for the years ended December 31, 1998, 1997 and 1996, was
$1,052,000, $499,000 and $495,000, respectively.
 
11. LONG-TERM DEBT
 
    Long-term debt is as follows:
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                    --------------------------
<S>                                                                 <C>           <C>
                                                                        1998          1997
                                                                    ------------  ------------
Term note payable, interest at the prime rate plus 1/2% (8.75% at
  December 31, 1998), principal payments commence in August 1998,
  due ratably through May 2000; secured by certain equipment......  $  1,500,000  $    740,700
Term note payable, interest at the prime rate plus 1/2% (8.75% at
  December 31, 1998), due ratably through December 1998; secured
  by certain equipment............................................            --       432,588
Other.............................................................            --        41,223
                                                                    ------------  ------------
                                                                       1,500,000     1,214,511
Current maturities of long-term debt..............................     1,000,000       658,986
                                                                    ------------  ------------
Long-term debt, less current maturities...........................  $    500,000  $    555,525
                                                                    ------------  ------------
                                                                    ------------  ------------
</TABLE>
 
    Both term note agreements include certain restrictive covenants that limit,
among other things, the payment of dividends, sale of assets and the incurrence
of additional indebtedness.
 
                                       46
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
11. LONG-TERM DEBT (CONTINUED)
    Maturities of long-term debt for the years ending December 31 are as
follows:
 
<TABLE>
<S>                                                               <C>
1999............................................................  $1,000,000
2000............................................................    500,000
                                                                  ---------
                                                                  $1,500,000
                                                                  ---------
                                                                  ---------
</TABLE>
 
12. REDEEMABLE COMMON STOCK
 
    Under a research agreement to fund development of products to treat
Parkinson's disease (see Note 15), Genentech, Inc. purchased 829,171 shares of
Common Stock for $8.3 million in December 1996. The agreement provided that if
the agreement is terminated and the funds received from the sale of Common Stock
exceed by more than $1 million the expenses incurred by the Company in
connection with such development, Genentech, Inc. has the right to require the
Company to repurchase shares of Common Stock having a value equal to the amount
of over funding, at the share price paid by Genentech. Accordingly, the Common
Stock is classified as redeemable Common Stock until such time as the related
funds are expended. At December 31, 1998, $3,051,000 had been spent on the
collaboration with Genentech and, accordingly, the Company has reclassified
those common shares and related value to stockholders' equity. On May 21, 1998,
Genentech exercised its right to terminate the Parkinson's collaboration and has
requested that the Company redeem, at a price of $10.01 per share, shares of the
Company's Common Stock having an aggregate value of at least $3.1 million. The
Company is negotiating with Genentech regarding the amount of such redemption
(which the Company currently expects may be approximately $3.1 million) and the
manner of payment for such redemption.
 
13. COMMON STOCK TO BE ISSUED
 
    In 1998, the Company entered into an agreement with a Company advisor, under
which the advisor prepared a strategic and business overview and provided
related implementation support for the Company. The advisor agreed to accept
cash and the Company's Common Stock as payment for its services. At December 31,
1998, the Company had paid the cash portion but had not issued the 85,258 shares
of Common Stock ($187,500) due to the advisor.
 
    In 1997, the merger with StemCells, Inc. required that StemCells
shareholders tender their StemCells shares and receive shares of
CytoTherapeutics in exchange. At December 31, 1997, 27,087 shares of StemCells
common stock and promissory notes totaling $168,750 remained to be tendered in
exchange for 101,310 shares of CytoTherapeutics Common Stock with a value of
$506,600 at the date of merger.
 
14. STOCKHOLDERS' EQUITY
 
STOCK OPTION AND EMPLOYEE STOCK PURCHASE PLANS
 
    The Company has adopted several stock plans which provide for the issuance
of incentive and nonqualified stock options, performance awards and stock
appreciation rights, at prices to be determined by the Board of Directors, as
well as the purchase of Common Stock under an employee stock purchase plan at a
discount to the market price. In the case of incentive stock options, such price
will not be less than the fair market value on the date of grant. Options
generally vest ratably over four years and are
 
                                       47
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
14. STOCKHOLDERS' EQUITY (CONTINUED)
exercisable for ten years from the date of grant or within three months of
termination. At December 31, 1998, the Company had reserved 3,560,826 shares of
common stock for the exercise of stock options. The following table presents the
combined activity of the Company's stock option plans (exclusive of the plans
noted below) for the years ended December 31:
 
<TABLE>
<CAPTION>
                                                   1998                         1997                         1996
                                       ----------------------------  ---------------------------  ---------------------------
<S>                                    <C>          <C>              <C>         <C>              <C>         <C>
                                                       WEIGHTED                     WEIGHTED                     WEIGHTED
                                                        AVERAGE                      AVERAGE                      AVERAGE
                                         OPTIONS    EXERCISE PRICE    OPTIONS    EXERCISE PRICE    OPTIONS    EXERCISE PRICE
                                       -----------  ---------------  ----------  ---------------  ----------  ---------------
Outstanding at January 1.............    2,446,573     $    7.48      2,423,025     $    8.34      1,921,284     $    7.72
Granted..............................    1,174,118          1.70        679,074          5.33        852,160          9.48
Exercised............................      (11,012)          .12        (82,737)         2.96       (168,085)         5.83
Canceled.............................   (1,955,553)         7.08       (572,789)         9.21       (182,334)         9.42
                                       -----------         -----     ----------         -----     ----------         -----
Outstanding at December 31...........    1,654,126     $    3.62      2,446,573     $    7.48      2,423,025     $    8.34
                                       -----------         -----     ----------         -----     ----------         -----
                                       -----------         -----     ----------         -----     ----------         -----
Options exercisable at December 31...    1,108,936     $    4.33      1,338,163     $    7.79      1,105,251     $    7.11
                                       -----------         -----     ----------         -----     ----------         -----
                                       -----------         -----     ----------         -----     ----------         -----
</TABLE>
 
    In addition to the options noted above, in conjunction with the StemCells
merger, StemCells' options were exchanged for options to purchase 250,344 shares
of the Company's Common Stock at $.01 per share originally issued under a prior
StemCells options plan; 75,384 of these options are exercisable at December 31,
1997, 96,750 of these options vest and become exercisable only upon achievement
of specified milestones, and the remaining 78,210 options vest over three years
from the date of grant. Additionally, the Company adopted the 1997
CytoTherapeutics, Inc. StemCells Research Stock Option Plan (the "StemCells
Research Plan") whereby an additional 2,000,000 shares of Common Stock has been
reserved. During 1997, the Company awarded options under the StemCells Research
Plan to purchase 1.6 million shares of the Company's Common Stock to the Chief
Executive Officer and scientific founders of StemCells at an exercise price of
$5.25 per share; approximately 100,000 of these options are exercisable
immediately, 1,031,000 of these options vest and become exercisable only upon
achievement of specified milestones and the remaining 469,000 options vest over
eight years.
 
    On July 10, 1998 the Company's Board of Directors approved a stock repricing
program for all permanent employees who held stock options. The price of the new
options was $1.281, the closing price on July 10, 1998. Options were exchanged
based on a .75 to 1 ratio. Employees surrendered 1,064,472 options for repricing
and the Company granted 751,018 repriced options, net of departures, in
accordance with this plan. All exchanged options were subject to a six month
blackout period that expired on February 12, 1999. The effect of this repricing
is reflected in the above rollforward.
 
    In July 1998, the Company adopted a shareholder rights plan, and the Board
of Directors declared a dividend consisting of one purchase right (a "Right")
for each share of Common Stock outstanding on August 4, 1998. Each share of
Common Stock issued after that date will be issued with an attached Right. Each
Right entitles the holder, upon the occurrence of certain events, to purchase
1/100th of a share of Junior Preferred Stock at an initial exercise price of
$10, subject to adjustments for stock dividends, splits and similar events. The
Rights are exercisable only if a person or group acquires 15 percent or more of
the Company's Common Stock or commences a tender of exchange offer, the
consummation of which would result in ownership by such person or group of 15
percent or more of the Company's Common Stock. The
 
                                       48
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
14. STOCKHOLDERS' EQUITY (CONTINUED)
Rights may be redeemed by the Board of Directors at any time prior to the
expiration of the rights plan on July 27, 2008 at the redemption price of $.01
each and may be amended by the Board at any time prior to becoming exercisable.
At March 31, 1999 there were 18,370,663 Junior Preferred Stock Purchase Rights
outstanding.
 
FAS 123 DISCLOSURES
 
    The Company has adopted the disclosure provisions only of Statement of
Financial Accounting Standards No. 123, ACCOUNTING FOR STOCK-BASED COMPENSATION
("FAS 123"), and will continue to account for its stock option plans in
accordance with the provisions of APB 25, ACCOUNTING FOR STOCK ISSUED TO
EMPLOYEES. The following table presents weighted average price and life
information about significant option groups outstanding at December 31, 1998:
 
<TABLE>
<CAPTION>
                                             OPTIONS OUTSTANDING               OPTIONS EXERCISABLE
                                  -----------------------------------------  -----------------------
<S>                               <C>          <C>              <C>          <C>         <C>
                                                  WEIGHTED
                                                   AVERAGE       WEIGHTED                 WEIGHTED
                                                  REMAINING       AVERAGE                  AVERAGE
            RANGE OF                NUMBER       CONTRACTUAL     EXERCISE      NUMBER     EXERCISE
        EXERCISE PRICES           OUTSTANDING    LIFE (YRS.)       PRICE     EXERCISABLE    PRICE
- --------------------------------  -----------  ---------------  -----------  ----------  -----------
Less than $5.00.................   1,180,750           7.44      $    1.30      689,246   $    1.25
$5.01 - $10.00..................     240,876           6.07           7.31      203,856        7.13
Greater than $10.00.............     232,500           4.97          11.59      215,834       11.50
                                  -----------                                ----------
                                   1,654,126                                  1,108,936
                                  -----------                                ----------
                                  -----------                                ----------
</TABLE>
 
    Pursuant to the requirements of FAS 123, the following are the pro forma net
loss and net loss per share for 1998, 1997, and 1996, as if the compensation
cost for the option plans and the stock purchase plan had been determined based
on the fair value at the grant date for grants in 1998, 1997, and 1996,
consistent with the provisions of FAS 123:
 
<TABLE>
<CAPTION>
                                        1998                            1997                            1996
                           ------------------------------  ------------------------------  ------------------------------
<S>                        <C>             <C>             <C>             <C>             <C>             <C>
                            AS REPORTED      PRO FORMA      AS REPORTED      PRO FORMA      AS REPORTED      PRO FORMA
                           --------------  --------------  --------------  --------------  --------------  --------------
Net loss.................  $  (12,627,830) $  (14,919,389) $  (18,113,580) $  (19,924,437) $  (13,759,138) $  (14,931,000)
Net loss per share.......  $         (.69) $         (.82) $        (1.08) $        (1.19) $         (.89) $         (.97)
</TABLE>
 
    The weighted average fair value per share of options granted during 1998,
1997 and 1996, was $0.82, $3.40, and $5.67, respectively. The fair value of
options and shares issued pursuant to the stock purchase plan at the date of
grant were estimated using the Black-Scholes model with the following weighted
average assumptions:
 
<TABLE>
<CAPTION>
                                                   OPTIONS                    STOCK PURCHASE PLAN
                                       -------------------------------  -------------------------------
<S>                                    <C>        <C>        <C>        <C>        <C>        <C>
                                         1998       1997       1996       1998       1997       1996
                                       ---------  ---------  ---------  ---------  ---------  ---------
Expected life (years)................          5          5          5         .5         .5          5
Interest rate........................        5.2%       6.2%       6.5%      4.64%       5.5%       6.5%
Volatility...........................       63.5%      59.0%      63.0%      63.5%      59.0%      63.0%
</TABLE>
 
                                       49
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
14. STOCKHOLDERS' EQUITY (CONTINUED)
    The Company has never declared nor paid dividends on any of its capital
stock and does not expect to do so in the foreseeable future.
 
    The effects on 1998, 1997 and 1996 pro forma net loss and net loss per share
of expensing the estimated fair value of stock options and shares issued
pursuant to the stock purchase plan are not necessarily representative of the
effects on reporting the results of operations for future years as the period
presented includes only one, two and three years, respectively, of option grants
under the Company's plans. As required by FAS 123, the Company has used the
Black-Scholes model for option valuation, which method may not accurately value
the options described.
 
STOCK WARRANTS
 
    In conjunction with StemCells merger, the Company has exchanged StemCells
warrants for warrants to purchase 8,952 shares of Company Common Stock at $4.71
per share. In conjunction with various equipment leasing agreements, the Company
has outstanding warrants to purchase 31,545 shares of Common Stock at prices
ranging from $4.00 to $9.00 per share. The warrants expire through October 2000.
In connection with a public offering of Common Stock in April 1995, the Company
issued warrants to purchase 434,500 shares of Common Stock at $8 per share. The
warrants are nontransferable and expire in April 2000, subject to certain
required exercise provisions. In addition to the foregoing rights, the holder of
such warrants has the right, in the event the Company issues additional shares
of Common Stock or other securities convertible into Common Stock, to purchase
at the then market price of such common stock, sufficient additional shares of
Common Stock to maintain the warrant holder's percentage ownership of the
Company's Common Stock at 15%. This right, subject to certain conditions and
limitations, expires in April 2000.
 
COMMON STOCK RESERVED
 
    The Company has reserved 7,818,936 shares of Common Stock for the exercise
of options, warrants and other contingent issuances of Common Stock.
 
15. RESEARCH AGREEMENTS
 
    In November 1997, StemCells, Inc., a wholly-owned subsidiary of the Company,
signed a Research Funding and Option Agreement with The Scripps Research
Institute ("Scripps") relating to research on certain stem-cell research. Under
the terms of the agreement, StemCells agreed to fund research in the total
amount of approximately $931,000 at Scripps over a period of three years.
StemCells has paid $77,000 at December 31, 1997. In addition, the Company agreed
to issue to Scripps 4,837 shares of the Company's common stock and a stock
option to purchase 9,674 shares of the Company's Common Stock with an exercise
price of $.01 per share upon the achievement of specified milestones. Under the
agreement, StemCells has an option for an exclusive license to the inventions
resulting from the sponsored research, subject to the payment of royalties and
certain other amounts, and is obligated to make payments totaling $425,000 for
achievement of certain milestones.
 
    In February 1997, the Company and Cognetix, Inc. entered into a
Collaboration and Development Agreement to screen selected peptides isolated by
Cognetix for possible development into therapeutic products aimed at a broad
range of human disease states using CytoTherapeutic's cell-based delivery
 
                                       50
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
15. RESEARCH AGREEMENTS (CONTINUED)
technology. Continuation of the agreement is contingent upon meeting an
agreed-upon proof of concept test. The companies will generally share expenses
associated with the development of any specific product candidate and any
resulting revenues, except as otherwise determined on a product-by-product
basis. As part of the agreement with Cognetix, the Company purchased $250,000 of
Cognetix preferred stock and, subject to certain milestones, was obligated to
purchase as much as $1,500,000 of additional Cognetix stock over the next year.
In July 1997, the Company loaned $250,000 to Cognetix which was repaid with
interest in October 1997. In October 1998, the Company sold the $250,000 of
preferred stock back to Cognetix for $298,914. The Company and Cognetix are
presently discussing proposed revisions to their relationship under the
agreement.
 
    In April 1997, the Company entered into an agreement with Neurospheres, Ltd.
which superseded all previous licensing agreements and settled a dispute with
Neurospheres. Under the terms of the settlement, the Company has an exclusive
royalty bearing license for growth-factor responsive stem cells for
transplantation. Neurospheres had an option to acquire co-exclusive rights but
did not exercise by the April 1998 deadline. The Company retains exclusive
rights for transplantation. The parties have no further research obligations to
each other.
 
    In November 1996, the Company signed collaborative development and licensing
agreements with Genentech, Inc. relating to the development of products using
the Company's technology to deliver certain of Genentech's proprietary growth
factors to treat certain diseases of the central nervous system.
 
    Under the terms of the agreement, Genentech purchased 829,171 shares of
redeemable common stock for $8.3 million to fund development of products to
treat Parkinson's disease. Genentech had the right, at its discretion to
terminate the Parkinson's program at specified milestones in the program. The
agreement provided that if the Parkinson's agreement was terminated and the
funds of the Company received from the sale of stock to Genentech pursuant to
the Parkinson's agreement exceed the expenses incurred by the Company in
connection with such studies by more than $1 million, Genentech had the right to
require the Company to repurchase from Genentech shares of the Company's common
stock having a value equal to the overfunding, based upon the share price paid
by Genentech. As such, the common stock purchased by Genentech is classified as
redeemable common stock until the funds are expended on the program. On May 21,
1998, Genentech, exercised its right to terminate the collaboration and
negotiations are currently underway to determine the balance of redeemable
common stock to be redeemed in accordance with the agreement. (See Note 12)
 
    The Company also licensed growth factors for the treatment of Huntington's
disease and for amyotrophic lateral sclerosis (ALS) from Genentech. Under the
terms of such agreements, the Company is responsible for conducting and funding
all preclinical and clinical development, subject to specified rights of
Genentech to participate in the development and marketing of the proposed
products. Should Genentech elect to share in the development costs of the
proposed products, the companies will share profits from certain territories at
negotiated percentages. Where Genentech does not participate in the development,
upon commercialization, the Company will pay Genentech an agreed upon royalty
based on sales.
 
    In March 1995, the Company signed a collaborative research and development
agreement with Astra AB for the development and marketing of encapsulated-cell
products to treat pain. Astra made an initial, nonrefundable payment of
$5,000,000, included in revenue from collaborative agreements in 1995, a
 
                                       51
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
15. RESEARCH AGREEMENTS (CONTINUED)
milestone payment of $3,000,000 in 1997 and may remit up to an additional
$13,000,000 subject to the achievement of certain development milestones. Under
the agreement, the Company is obligated to conduct certain research and
development pursuant to a four-year research plan agreed upon by the parties.
Over the term of the research plan, the Company expects to receive annual
payments of $5 million to $7 million from Astra which should approximate the
research and development costs incurred by the Company under the Plan. Subject
to successful product development and obtaining necessary regulatory approvals,
Astra is obligated to conduct all clinical trials of products arising from the
collaboration and to seek approval for their sale. Astra has the exclusive
worldwide right to market products covered by the agreement. Until the later of
either expiration of all patents included in the licensed technology or a
specified term, the Company is entitled to a royalty on the worldwide net sales
of such products in return for the marketing license granted to Astra and the
Company's obligation to manufacture and supply products. Astra has the right to
terminate the agreement after April 1, 1998.
 
    In May 1998, Astra AB agreed to increase annual research and development
payments from $7 million to $8.5 million for the calendar year 1998. This
increase in funding was recognized as revenue in the third and fourth quarters
of 1998. The current Phase II pain trial is expected to complete patient
enrollment by March 31, 1999, with efficacy data from the trial expected by the
third quarter of 1999. Astra AB has agreed to fund the first and second quarters
of 1999 at the rate of $2.5 million per quarter. Funding for the second half of
1999 is contingent on the results of the current Phase II trial. Should Astra
determine to discontinue funding for the Company's development of
encapsulated-cell products to treat pain, or to reduce such funding or otherwise
modify the terms of the Company's relationship with Astra, any such action could
have a material, adverse effect on the Company's liquidity and capital
resources, and, unless other funding sources were obtained, would likely result
in the Company's inability to continue to fund further development of its
proposed encapsulated-cell products.
 
    The Company has entered into other collaborative research agreements whereby
the Company funds specific research programs. Pursuant to such agreements, the
Company is typically granted rights to the related intellectual property or an
option to obtain such rights on terms to be agreed, in exchange for research
funding and specified royalties on any resulting product revenue. To date, the
Company's principal academic collaborations have been with Brown University and
Dr. Aebischer and Centre Hospitalier Universitaire Vaudois in Switzerland.
Research and development expenses incurred under these collaborations amounted
to approximately $1,259,000, $1,326,000, and $1,337,000 for the years ended
December 31, 1998, 1997 and 1996, respectively.
 
16. INCOME TAXES
 
    Due to net losses incurred by the Company in each year since inception, no
provision for income taxes has been recorded. At December 31, 1998, the Company
had tax net operating loss carryforwards of $26,966,000 and research and
development tax credit carryforwards of $3,646,000 which expire at various times
through 2012. Due to the "change in ownership" provisions of the Tax Reform Act
of 1986, the Company's utilization of its net operating loss carryforwards and
tax credits may be subject to annual limitation in future periods.
 
                                       52
<PAGE>
                             CYTOTHERAPEUTICS, INC.
 
            NOTES TO CONSOLIDATED FINANACIAL STATEMENTS (CONTINUED)
 
                               DECEMBER 31, 1998
 
16. INCOME TAXES (CONTINUED)
    Significant components of the Company's deferred tax assets and liabilities
are as follows:
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31,
                                                                ------------------------------
<S>                                                             <C>             <C>
                                                                     1998            1997
                                                                --------------  --------------
Deferred tax assets:
  Capitalized research and development costs..................  $   28,124,000  $   23,876,000
  Net operating losses........................................      10,786,000       9,977,000
  Research and development credits............................       3,646,000       2,963,000
  Other.......................................................         235,000         275,000
                                                                --------------  --------------
                                                                    42,791,000      37,091,000
Deferred tax liabilities:
  Patents.....................................................      (1,537,000)     (1,296,000)
                                                                --------------  --------------
                                                                    41,254,000      35,795,000
  Valuation allowance.........................................     (41,254,000)    (35,795,000)
                                                                --------------  --------------
Net deferred tax assets.......................................  $           --  $           --
                                                                --------------  --------------
                                                                --------------  --------------
</TABLE>
 
    Since there is uncertainty relating to the ultimate use of the loss
carryforwards and tax credits, a valuation allowance has been recognized at
December 31, 1998 and 1997, to fully offset the Company's deferred tax assets.
The valuation allowance increased $5,459,000 in 1998, due primarily to the
increases in capitalized research and development costs, net operating loss
carryforwards and tax credits.
 
17. EMPLOYEE RETIREMENT PLAN
 
    The Company has a qualified defined contribution plan covering substantially
all employees. Participants are allowed to contribute a fixed percentage of
their annual compensation to the plan and the Company may match a percentage of
that contribution. The Company matches 50% of employee contributions, up to 6%
of employee compensation, with the Company's common stock. The related expense
was $146,000, $169,000, and $162,000 for the years ended December 31, 1998, 1997
and 1996, respectively.
 
18. CONTINGENCIES
 
    The Company is routinely involved in arbitration, litigation and other
matters as part of the ordinary course of its business. While the resolution of
any matter may have an impact on the Company's financial results for a
particular reporting period, management believes the ultimate disposition of
these matters will not have a materially adverse effect on the Company's
consolidated financial position or results of operations.
 
                                       53
<PAGE>
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
  FINANCIAL DISCLOSURE
 
    None.
 
                                    PART III
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT, PROMOTERS AND
  CONTROL PERSONS
 
DIRECTORS AND EXECUTIVE OFFICERS
 
    The sections entitled "Election of Directors" and "Executive Officer" in the
Company's definitive proxy statement for its 1999 Annual Meeting of Shareholders
are hereby incorporated by reference.
 
ITEM 11. EXECUTIVE COMPENSATION
 
    The section entitled "Executive Compensation" in the Company's definitive
proxy statement for its 1999 Annual Meeting of Shareholders is hereby
incorporated by reference.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
    The section entitled "Share Ownership" in the Company's definitive proxy
statement for its 1999 Annual Meeting of Shareholders is hereby incorporated by
reference.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
    The section entitled "Certain Relationships and Related Transactions" in the
Company's definitive proxy statement for its 1999 Annual Meeting of Shareholders
is hereby incorporated by reference.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
 
    (A) DOCUMENTS FILED AS PART OF THIS FORM 10-K.
 
    (1) Financial Statement Schedules:
 
<TABLE>
<CAPTION>
ITEM                                                                                    LOCATION
- ------------------------------------------------------------------------------------  -------------
<S>                                                                                   <C>
Schedule II--Valuation and Qualifying Accounts......................................          S-1
</TABLE>
 
    Schedules not included herein are omitted because they are not applicable or
the required information appears in the Financial Statements or Notes thereto.
 
    (2) Exhibits.
 
<TABLE>
<CAPTION>
EXHIBIT NO.                                             TITLE OR DESCRIPTION
- -----------------  -----------------------------------------------------------------------------------------------
<C>                <S>
 
   3.1*            Restated Certificate of Incorporation of the Registrant.
 
   3.2++           Amended and Restated By-Laws of the Registrant.
 
   4.1*            Specimen Common Stock Certificate.
 
   4.2++++         Form of Warrant Certificate issued to a certain purchaser of the Registrant's Common Stock in
                   April 1995.
 
  10.4*            Amendment to Registration Rights dated as of February 14, 1992 among the Registrant and certain
                   of its stockholders.
</TABLE>
 
                                       54
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT NO.                                             TITLE OR DESCRIPTION
- -----------------  -----------------------------------------------------------------------------------------------
<C>                <S>
  10.5* **         Research Agreement dated March 1, 1989 between the Registrant and Brown University as amended
                   by Modification No. 1 dated December 21, 1990, Modification No. 2 dated February 22, 1991 and
                   Modification No. 3 dated November 1, 1991.
 
  10.5A*           Letter Agreement dated March 4, 1992 between the Registrant and Brown University.
 
  10.6*            License Agreement dated March 16, 1989 between the Registrant and Brown University, as amended
                   by Amendment Agreement dated May 2, 1991.
 
  10.7*            Research Agreement dated March 16, 1989 between Registrant and Washington University.
 
  10.12*           Employment Agreement dated January 3, 1991 between the Registrant and Dr. Seth A. Rudnick.
 
  10.15*           Form of at-will Employment Agreement between the Registrant and most of its employees.
 
  10.16*           Agreement for Consulting Services dated March 16, 1989 between the Registrant and Dr. Patrick
                   Aebischer.
 
  10.18*           Agreement for Consulting Services dated March 16, 1989 between the Registrant and Dr. Paul
                   Lacy.
 
  10.20*           Form of Agreement for Consulting Services between the Registrant and members of its Scientific
                   Advisory Board.
 
  10.21*           Form of Nondisclosure Agreement between the Registrant and its Contractors.
 
  10.22*           Funding Agreement dated June 22, 1989 between the Registrant and the Rhode Island Partnership
                   for Science and Technology.
 
  10.28*           Master Lease and Warrant Agreement dated April 23, 1991 between the Registrant and PacifiCorp
                   Credit, Inc.
 
  10.29*           1988 Stock Option Plan.
 
  10.30*           1992 Equity Incentive Plan.
 
  10.31*           1992 Stock Option Plan for Non-Employee Directors.
 
  10.32*           1992 Employee Stock Purchase Plan.
 
  10.35#           Consulting Agreement dated as of September 1, 1992 between Dr. Edwin C. Cadman and the
                   Registrant.
 
  10.36**#         Letter Agreement between Registrant and Dr. Patrick Aebischer dated October 13, 1992 as amended
                   by a letter agreement dated December 23, 1993.
 
  10.37+           Employment Agreement dated September 9, 1992 between Registrant and Frederic A. Eustis, III.
 
  10.41**!!!!      Development and Supply Agreement dated December 1993 between Registrant and AKZO Faser AG.
 
  10.42**!!!!      Asset Transfer Agreement dated as of December 23, 1994 between Registrant and Neocrin Company.
 
  10.43##**        Research Agreement dated as of February 1, 1994 between Genentech, Inc. and Registrant.
</TABLE>
 
                                       55
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT NO.                                             TITLE OR DESCRIPTION
- -----------------  -----------------------------------------------------------------------------------------------
<C>                <S>
  10.44##**        Research Agreement dated as of March 16, 1994 between NeuroSpheres, Ltd. and Registrant.
 
  10.46++          Termination Agreement dated as of August 4, 1994 between Registrant and Medtronic, Inc.
 
  10.47++          Term Loan Agreement dated as of September 30, 1994 between The First National Bank of Boston
                   and Registrant.
 
  10.48++          Lease Agreement between the Registrant and Rhode Island Industrial Facilities Corporation,
                   dated as of August 1, 1992.
 
  10.49++          First Amendment to Lease Agreement between Registrant and The Rhode Island Industrial
                   Facilities Corporation dated as of September 15, 1994.
 
  10.50++          Supplementary Agreement dated as of July 1, 1994 between Akzo Nobel Faser AG and the
                   Registrant.
 
  10.51**++++      Development, Marketing and License Agreement, dated as of March 30, 1995 between Registrant and
                   Astra AB.
 
  10.52++++        Form of Unit Purchase Agreement to be executed by the purchasers of the Common Stock and
                   Warrants offered in April 1995.
 
  10.53+++         Form of Common Stock Purchase Agreement to be executed among the Registrant and certain
                   purchasers of the Registrant's Common Stock.
 
  10.54!**         Research and Commercialization Agreement dated as of September 4, 1995 among the Company, Dr.
                   Patrick Aebischer and Canton of Vaud, Switzerland.
 
  10.55!!          Employment agreement dated as of July 2, 1996 between Dr. Sandra Nusinoff Lehrman and
                   Registrant.
 
  10.56!!          Consulting agreement dated as of September 1, 1996 between Dr. Edwin C. Cadman and the
                   Registrant.
 
  10.57!!          Convertible loan agreement dated as of July 10, 1996 between the Company and Modex
                   Therapeutiques SA.
 
  10.58###         Lease Agreement dated as of November 21, 1997 by and between Hub RI Properties Trust, as
                   Landlord, and CytoTherapeutics, Inc., as Tenant.
 
  10.59!!          Modex Therapeutiques SA stockholders voting agreement dated as of July 10, 1996 among Modex,
                   the Company, the Societe Financiere Valoria SA and the other stockholders listed therein.
 
  10.60!!          CTI individual stockholders option agreement dated as of July 10, 1996 among the Company and
                   the individuals listed therein.
 
  10.61!!          CTI Valoria option agreement dated of July 10, 1996 between the Company and the Societe
                   Financiere Valoria SA.
 
  10.62**!!!       Development Collaboration and License Agreement dated as of November 22, 1996 between
                   Genentech, Inc. and the Registrant.
 
  10.63!!!         Consulting Agreement dated as of December 1, 1996, between Peter Simon and the Registrant.
</TABLE>
 
                                       56
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT NO.                                             TITLE OR DESCRIPTION
- -----------------  -----------------------------------------------------------------------------------------------
<C>                <S>
  10.64!!!         Term Loan Agreement dated as of October 22, 1996 between The First National Bank of Boston and
                   the Registrant.
 
  10.65***         Agreement and Plan of Merger dated as of August 13, 1997 among StemCells, Inc., the Registrant
                   and CTI Acquisition Corp.
 
  10.67***         Consulting Agreement dated as of September 25, 1997 between Dr. Irving Weissman and the
                   Registrant.
 
  10.68###         Letter Agreement among each of Dr. Irving Weissman and Dr. Fred H. Gage and the Registrant.
 
  10.69**          Amended and Restated Cross License Agreement dated as of October 29, 1997 between Modex
                   Therapeutiques SA and the Registrant.
 
  10.70###         Letter Agreement dated as of September 30, 1997 between Dr. Seth Rudnick and the Registrant.
 
  10.71****        StemCells, Inc. 1996 Stock Option Plan.
 
  10.72****        1997 StemCells Research Stock Option Plan (the "1997 Plan").
 
  10.73****        Form of Performance-Based Incentive Option Agreement issued under the 1997 Plan.
 
  10.74###         Employment Agreement dated as of September 25, 1997 between Dr. Richard M. Rose and the
                   Registrant.
 
  10.75###         Employment agreement dated as of April 17, 1997, between John S. McBride and the Registrant.
 
  10.76###         Severance agreement dated as of July 21, 1997, between Dr. Sandra Nusinoff Lehrman and the
                   Registrant.
 
  10.77###         Severance agreement dated as of July 29, 1997 between Dr. E. Edward Baetge and the Registrant.
 
  10.78###         Loan Agreement dated as of May 15, 1996 between Fleet National Bank and the Registrant,
                   together with the related Promissory Note executed by the Registrant, and an amendatory
                   agreement dated as of May 15, 1997.
 
  10.79~           Rights Agreement, dated as of July 27, 1998 between Bank Boston, N.A. as Rights Agent and the
                   Registrant.
 
  10.80            Employment Agreement dated as of June 8, 1998 between Philip K. Yachmetz and the Registrant.
 
  10.81            Consulting Services Agreement dated as of July 27, 1998, as amended December 19, 1998 between
                   Dr. John J. Schwartz and the Registrant.
 
  10.82            Letter Agreement dated as of December 19, 1998 between John J. Schwartz and the Registrant.
 
  10.83**          License Agreement dated as of October 27, 1998 between The Scripps Research Institute and the
                   Registrant.
 
  10.84**          License Agreement dated as of October 27, 1998 between The Scripps Research Institute and the
                   Registrant.
 
  10.85**          License Agreement dated as of November 20, 1998 between The Scripps Research Institute and the
                   Registrant.
</TABLE>
 
                                       57
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT NO.                                             TITLE OR DESCRIPTION
- -----------------  -----------------------------------------------------------------------------------------------
<C>                <S>
  10.86            Employment Agreement dated as of March 20, 1998 between Billie M. York and the Registrant
 
  21               Subsidiaries of the Registrant.
 
  23.1             Consent of Ernst & Young LLP, Independent Auditors.
 
  27               Financial Data Schedule for fiscal year ended December 31, 1998.
 
  99               Cautionary Factors Relevant to Forward-Looking Information.
</TABLE>
 
- ------------------------
 
   ++ Previously filed with the Commission as Exhibits to, and incorporated
      herein by reference to, the Registrant's Registration Statement on Form
      S-1, File No. 33-85494.
 
  +++ Previously filed with the Commission as Exhibits to, and incorporated
      herein by reference to, the Registrant's Registration Statement on Form
      S-3, File No. 33-97272.
 
 ++++ Previously filed with the Commission as Exhibits to, and incorporated
      herein by reference to, the Registrant's Registration Statement on Form
      S-1, File No. 33-91228.
 
      * Previously filed with the Commission as Exhibits to, and incorporated
        herein by reference to, Registration Statement on Form S-1, File No.
        33-45739.
 
     # Previously filed with the Commission as Exhibits to, and incorporated
       herein by reference to, the Registrant's Annual Report on Form 10-K for
       fiscal year ended December 31, 1992 and filed March 30, 1993.
 
     ** Confidential treatment requested as to certain portions. The term
        "confidential treatment" and the mark "**" as used throughout the
        indicated Exhibits mean that material has been omitted and separately
        filed with the Commission.
 
   ## Previously filed with the Commission as Exhibits to, and incorporated
      herein by reference to, the Registrant's Quarterly Report on Form 10-Q for
      the quarter ended March 31, 1994 and filed on May 14, 1994.
 
     + Previously filed with the Commission as Exhibits to, and incorporated
       herein by reference to, the Registrant's Annual Report on Form 10-K for
       the fiscal year ended December 31, 1993 and filed on March 30, 1994.
 
      ! Previously filed with the Commission as an Exhibit to and incorporated
        by reference to, the Registrant's Quarterly Report on Form 10-Q for the
        quarter ended March 31, 1996.
 
     !! Previously filed with the Commission as an Exhibit to and incorporated
        by reference to, the Registrant's Quarterly Report on Form 10-Q for the
        quarter ended September 30, 1996.
 
     !!! Previously filed with the Commission as an Exhibit to, and incorporated
         herein by reference to, the Registrant's Annual Report on Form 10-K for
         the fiscal year ended December 31, 1996 and filed on March 31, 1997.
 
    !!!! Previously filed with the Commission as an Exhibit to, and incorporated
         herein by reference to, the Registrant's Annual Report on Form 10-K for
         the fiscal year ended December 31, 1995.
 
    *** Previously filed with the Commission as Exhibits to, and incorporated
        herein by reference to, the Registrant's Quarterly Report on Form 10-Q
        for the quarter ended September 30, 1997 and filed on November 14, 1997.
 
   **** Previously filed with the Commission as Exhibits to, and incorporated
        herein by reference to, the Registrant's Registration Statement on Form
        S-8, File No. 333-37313.
 
  ### Previously filed with the Commission as an Exhibit to, and incorporated
      herein by reference to, the Registrant's annual report on Form 10-K for
      the fiscal year ended December 31, 1997 and filed on March 30, 1998.
 
     ~ Previously filed with the Commission as an Exhibit to, and incorporated
       herein by reference to, the Registrant's current report on Form 8-K filed
       on August 3, 1998.
 
    (B) CURRENT REPORTS ON FORM 8-K.
 
    On December 29, 1998, the Company filed a Report on Form 8-K with the
Securities and Exchange Commission announcing the election of two new directors
and a new Chairman of the Board of Directors.
 
                                       58
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
behalf by the undersigned, thereunto duly authorized.
 
<TABLE>
<S>                             <C>  <C>
                                CYTOTHERAPEUTICS, INC.
 
                                BY:          /S/ RICHARD M. ROSE, M.D.
                                     -----------------------------------------
                                               Richard M. Rose, M.D.
                                       President and Chief Executive Officer
</TABLE>
 
Dated: March 31, 1999
 
    Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
          SIGNATURE                      CAPACITY                   DATE
- ------------------------------  ---------------------------  -------------------
<C>                             <S>                          <C>
                                President, Chief Executive
  /s/ RICHARD M. ROSE, M.D.       Officer, and Director
- ------------------------------    (principal executive         March 31, 1999
    Richard M. Rose, M.D.         officer)
 
                                Chief Financial Officer and
                                  Treasurer (principal
     /s/ JOHN S. MCBRIDE          financial and accounting
- ------------------------------    officer); Executive Vice     March 31, 1999
       John S. McBride            President, Business
                                  Operations
 
 /s/ PATRICK AEBISCHER, M.D.,   Director
            PH.D.
- ------------------------------                                 March 31, 1999
Patrick Aebischer, M.D., Ph.D.
 
   /s/ MOSES GODDARD, M.D.      Director
- ------------------------------                                 March 31, 1999
     Moses Goddard, M.D.
 
      /s/ MARK J. LEVIN         Director
- ------------------------------                                 March 31, 1999
        Mark J. Levin
 
    /s/ RICHARD J. RAMSDEN      Director
- ------------------------------                                 March 31, 1999
      Richard J. Ramsden
 
 /s/ JOHN J. SCHWARTZ, PH.D.    Director, Chairman of the
- ------------------------------    Board                        March 31, 1999
   John J. Schwartz, Ph.D.
 
 /s/ IRVING L. WEISSMAN, M.D.   Director
- ------------------------------                                 March 31, 1999
   Irving L. Weissman, M.D.
</TABLE>
 
                                       59

<PAGE>

                                                                   EXHIBIT 10.80


                                  EXHIBIT 10.80

                               PHILIP K. YACHMETZ
                              EMPLOYMENT AGREEMENT

<PAGE>

                                                                   EXHIBIT 10.80

                              EMPLOYMENT AGREEMENT

      THIS EMPLOYMENT AGREEMENT is made as of this 8th day of June, 1998 (the
"Effective Date"), by and between CYTOTHERAPEUTICS, INC., a Delaware corporation
("Employer") having its principal place of business at 701 George Washington
Highway, Lincoln, Rhode Island 02865 and PHILIP K. YACHMETZ ("Employee") with a
principal residence at 7 North Koewing Place, West Orange, New Jersey
07052-4014, collectively referred to as the "parties."

RECITALS

      Whereas Employer desires to employ Employee at its Lincoln, Rhode Island
Facility and Employee desires to be so employed,

      The parties enter this Agreement to set forth the terms and conditions of
Employee's employment by Employer, to address certain matters related to
Employee's employment with Employer, and Employee's loyalty and commitment to
Employer.

      NOW THEREFORE, in consideration of these promises and the parties'
material covenants, representations, and warranties made herein, the parties
agree as follows:

                             STATEMENT OF AGREEMENT

SECTION 1. EMPLOYMENT

      a. Position. Employer wishes to employ and Employee hereby accepts the
position of Senior Vice President - Business Development, General Counsel and
Secretary for the term of this Agreement. Employee shall report directly to
Employer's Chief Executive Officer.

      b. Employee's Commitment. Employee shall consider his employment by
Employer as his principal employment, shall devote his full business time and
attention to his duties and responsibilities under this Agreement, and shall
perform them to the best of his abilities. While subject to any provision of
this Agreement, Employee shall maintain loyalty to Employer, and shall take no
action that would directly or indirectly promote any competitor or injure
Employer's interests. Subject to the foregoing, employee may engage in other
charitable or business activities to the extent that they do not interfere or
create a conflict with his obligations under this Agreement; provided that
Employee first discloses any such activities to Employer, and that Employee's

<PAGE>

continued participation in any such activity shall be subject to Employer's
ongoing approval, which may be withheld at Employer's sole discretion.

      c. Duties. Employee's primary duties and responsibilities as Senior Vice
President - Business Development, General Counsel and Secretary shall be to:

      (1) Direct and oversee all legal matters pertaining to CTI, including
contractual relationships, general corporate and securities matters, patent,
copyright and the coordination of any legal matters handled by outside counsel.

      (2) Direct the research and analysis of such business opportunities,
strategic partnerships, alliances and collaborations, including the
establishment and recommendation of strategic initiatives as directed by the
Employer's CEO from time to time; responsible for implementation of such
strategic initiatives of Senior Management as directed by the Employer's CEO
from time to time, including the negotiation of agreements related to external
alliances, direct the policies and programs related to corporate licensing
objectives for the acquisition of licensing opportunities and techniques.

      (3) Serve as corporate secretary of the Company and its subsidiaries.

SECTION 2. COMPENSATION, BENEFITS AND EXPENSES

      a. Salary. Subject to Subsection 2b, Employer shall pay Employee as salary
of Two Hundred Fifty Thousand dollars ($250,000.00) annually, payable in
accordance with Employer's payroll practices in effect from time to time.

      b. Bonus.

            (1) Employee shall receive a "sign on" bonus of Fifteen Thousand
Dollars ($15,000) payable, $10,000 in cash and $5,000 in registered shares of
Employer's common stock (2,712 shares), calculated at the price per share of
$1.84375 ($1 27/32) per share, the closing price of the Employer's common stock
as quoted on the Nasdaq stock exchange for the Effective Date of Employment.

            (2) In addition, Employee shall be eligible (in the sole discretion
of the Employer) to receive performance related bonuses at the end of each
calendar year, including 1998, in a percentage amount of base salary similar to
that for which other members of the Employer's senior management are eligible or
are awarded under guidelines in effect at such time. Employee's bonus shall be
based on (i) the reduction in comparable outside legal fees versus the base
period of January 1, 1998 through June 30, 1998, (ii) the level of cash funding
received by Employer from business development transactions with third parties
in which Employee is materially involved, and (iii) the attainment of other
specific performance objectives mutually agreed with Employer's 

<PAGE>

Chief Executive Officer. The payment and amount of any such bonus shall be
determined in the sole discretion of the Employer and its Board of Directors.

      c. Stock Options. Through the Employer's 1992 Equity Incentive Plan (the
"Incentive Plan") and subject to the terms and conditions set forth herein,
Employee is hereby granted, as of the Effective Date of this Agreement, an
option to acquire 75,000 shares of the common stock of the Employer at a strike
price per share equal to the closing price of the Employer's common stock on the
date such option is approved by the Employer's Board of Directors or such other
strike price as may be specified by the Board of Directors. The time-based
option will vest as follows: (i) 30,000 of the shares will vest on the Effective
Date, and (ii) the remaining 45,000 shares shall vest at the rate of 3,000
shares per month on each monthly anniversary of the Effective Date so long as
Employee continues to be employed hereunder. Employee shall have one (1) year
from the last such vesting date within which to exercise such option. The
expiration of the Initial Term of this Agreement shall not effect the validity,
the vesting schedule or the exercise period of such option granted Employee.

The compensation set forth in Sections 2a, 2b and 2c may be increased from time
to time at the will and discretion of Employer.

      d. Relocation. As soon as reasonably practicable following the Effective
Date, Employee will establish his principal office at the Company's offices in
Lincoln, Rhode Island and a temporary residence within driving distance of such
office. The Employer shall pay or reimburse Employee up to an amount not to
exceed $2,500 per month for all costs of such temporary housing and related
expenses, including, but not limited to, apartment rent and security deposit,
furniture rental, utilities, cable television, basic telephone service and
similar expenses, for the term of this Agreement and for such additional period
while Employee is still rendering services to the Employer pursuant to Section
4.a.(1) (collectively the "Temporary Residence Period"). Employer shall also
during the Temporary Residence Period pay or reimburse Employee for two (2)
round trip airfares per month to the New Jersey/New York area for use by
Employee or his daughter. Until such time as Employee has established his
temporary residence in Rhode Island, Employer shall reimburse Employee for
hotel, travel, meal and related costs to and from New Jersey. The cost of
Employee's temporary housing and the cost of the two (2) round trips airfares
set forth above are hereinafter collectively referred to as the "Temporary
Relocation Expenses."

      e. Benefits. Employee will be entitled to participate in any and all
employee benefit plans from time to time in effect for senior management of the
Employer generally, including, but not limited to, medical, dental and
hospitalization plans, retirement and 401(k) savings plans, life insurance and
accidental death plans, disability plans, etc., except to the extent that such
plans provide duplicative benefits or a lower level of benefits than that
specifically provided Employee herein. Additionally, Employee shall be entitled
to participation similar to that provided other members of 

<PAGE>

Employer's senior management in any supplemental stock or option grants, stock
appreciation rights awards, phantom stock rights, "golden parachute" or "golden
handcuff" policies of the Employer in effect as of the Effective Date or adopted
by Employer thereafter for the general benefit of its senior management.
Employee's participation shall be subject to (i) the terms of the applicable
plan documents, (ii) generally applicable policies of the Employer, and (iii)
the discretion of the Board of Directors of the Employer and plan
administrators, as provided for or contemplated by such plan. Employee will be
entitled to four (4) weeks vacation per year. Employer will provide Employee
with a leased automobile at a cost to be approved by Employer's CEO, cover the
cost of up to three (3) state bar memberships per year and the cost of
professional association memberships consistent with Employer's policy for its
senior management.

      f. Withholdings, "Gross Up" of Compensation. Employer shall withhold from
any amounts payable as compensation all federal, state, municipal, or other
taxes as are required by any law, regulation, or ruling. Employer shall "gross
up" any and all Temporary Relocation Expenses paid or reimbursed to Employee
during the Temporary Residence Period by 36% in order to offset any and all
income tax liability to Employee for the payment or reimbursement of these
expenses by Employer. In addition, in the event Employee sustains an increased
state income tax liability due to the payment of state income taxes in both
Rhode Island and New Jersey versus Employee's paying only New Jersey state
income tax, then Employer shall "gross up" the compensation paid to Employee
hereunder in order to reimburse and offset any and all incremental increase in
Employee's state income tax liability.

      g. Business Expenses. Employer shall reimburse Employee for expenses
reasonably incurred in the course of his employment, in accordance with
Employer's policies in effect from time to time.

SECTION 3. TERM

      a. Initial Term. The term of Employee's employment shall commence on the
Effective Date and shall expire on June 7, 1999 (the "Initial Term") unless
extended as otherwise provided herein. Employer and Employee shall, on or about
the ninth (9th) monthly anniversary of the Effective Date, meet and discuss in
good faith whether it is in the best interests of both parties to extend the
term of this Agreement. In the event it is mutually agreed that the term of this
Agreement shall be extended (the "Renewal Term"), then the terms and conditions
for the Renewal Term shall be mutually agreed by Employer and Employee on or
before the eleventh (11th) monthly anniversary of the Effective Date. In the
event either party elects to not extend the term of this Agreement, or the
Employer and Employee are unable to mutually agree on the terms and conditions
for the Renewal Term on or before the eleventh (11th) monthly anniversary of the
Effective Date, then this Agreement shall expire on June 7, 1999 and the
provisions of Section 4 shall apply.

<PAGE>

      b. Termination. Notwithstanding any other provision of this Agreement,
Employee's employment shall terminate at any time, as follows:

      (1) Employer may terminate your employment upon thirty (30) days written
      notice to Employee in the event you become disabled during your employment
      through any illness, injury, accident or condition of either a physical or
      psychological nature and, as a result, you are unable to perform
      substantially all of your duties and responsibilities hereunder for ninety
      (90) consecutive days during the Initial Term. In that event, the Employer
      shall pay Employee the severance set forth in Section 4.

            (2) Employee's employment may also be terminated by Employer at any
time without prior notice upon a showing of "reasonable cause." Should Employee
be terminated by Employer for "reasonable cause," no severance pay will be paid
to Employee nor will his health insurance benefits be continued by Employer at
its expense for any period of time as addressed in Section 4 of this Agreement.
"Reasonable cause" shall be defined for the purposes of this Agreement as being:
(a) any act of fraud, embezzelement or other material dishonesty by Employee
with respect to the Employer which is proven to be directly detrimental to
Employer's best interest; (b) Employee's willful failure to perform material
duties and responsibilities described in Section 1 (c) above, after receiving
notice and a reasonable opportunity to cure; (d) Employee's conviction of, or
plea of nolo contendre to, any act that constitutes a felony under the laws of
the state of Rhode Island or the United States; or (e) Employee's material
breach of Section 5 of this Agreement.

SECTION 4. SEVERANCE

      a. Severance Payments and Benefits. In the event at the end of the Initial
Term either Employee chooses not to renew this Agreement, or Employer fails to
offer Employee employment in the capacity provided for herein at an annual
salary and related benefits at least equal to the salary and benefits provided
for herein and at a primary work location in the Northeastern United States
(subject to such travel as the Employer may reasonably request), or Employer and
Employee are unable to mutually agree to other terms and conditions for
Employee's continued employment during any such Renewal Term, Employee shall
receive the following Severance Payments and Benefits from Employer:

      (1) A continuation of Employee's salary equal to the amount of his regular
      salary as of the date of the expiration of the Initial Term for a period
      of three (3) months, during which Employee shall continue to devote no
      more than fifty percent (50%) of his time to performing or consulting with
      Employer with respect to his duties and responsibilities described in
      Section 1(c) above. In the event such part time services are rendered from
      Rhode Island, then Employer

<PAGE>

      will continue to pay or reimburse Employee for the Temporary Relocation
      Expenses for such three (3) month period pursuant to Section 2.d and
      provide the other benefits set forth in Sections 2.e., 2.f. and 2.g.

            (2) A lump sum payment equal to six (6) month's of Employee's
regular salary as of the date of the expiration of the Initial Term, such lump
sum to be payable no later than the expiration of the three (3) month period set
forth in Section 4.a.(1) above.

            (3) Payment of any accrued but unpaid bonus under Section 2.b.(2)
for the year in which the Initial Term expires, such bonus sum to be payable no
later than the expiration of the three (3) month period set forth in Section
4.a.(1) above.

      (4) During the nine (9) month period following the expiration of the
      Initial Term and to the extent allowed by the Employer's benefit plans,
      Employee shall continue to be eligible to participate in, and shall accrue
      benefits as does an active employee in all benefit plans, including, but
      not limited to, medical, dental and hospitalization plans, retirement and
      401(k) savings plans, life insurance and accidental death plans,
      disability plans, etc., in which Employee is enrolled as of the expiration
      of the Initial Term, and in each case as applicable during such period.
      Employee shall be treated as an employee of the Employer during the first
      three months of such nine month period for the purposes of Section 2.c,
      2.d., 2.e., 2.f and 2.g. of this Agreement.

      b. Payments Upon Employee's Disability. In the event of an early
termination of this Agreement pursuant to Section 3.b.(1) due to Employee's
disability then the Severance Pay and Benefits provided in Section 4.a. shall be
paid to Employee. If Severance Pay and Benefits are payable because of
Employee's disability, they shall be deemed to be made as compensation for
Employee's past services to Employer.

      c. Reference Letter Upon Separation of Employment. Employer agrees to
provide Employee with a letter of recommendation upon Employee's separation of
employment, granted that Employee's separation of employment from Employer is
for any reason other than "reasonable cause."

SECTION 5. CONFIDENTIALITY

      a. Confidential Information. "Confidential Information" means information
in whatever form, including information that is written, electronically stored,
orally transmitted, or memorized, that is of commercial value to Employer and
that was created, discovered, developed, or otherwise becomes known to Employee,
or in which property rights are held, assigned to, or otherwise acquired by or
conveyed to Employer, including any Employee Invention (as subsequently defined)
or idea, knowledge, know-how, process, system, method, technique research and
development, 

<PAGE>

technology, software, technical information, trade secret, as defined in state
statute, trademark, copyrighted material, reports, records, documentation, data,
customer or supplier lists, tax or financial information, business or marketing
plans, strategy or forecast. Confidential Information does not include
information that is or becomes generally known within Employer's industry
through no act or omission by Employee, provided, however, that the compilation,
manipulation, or other exploitation of generally known information may
constitute Confidential Information.

      b. Employee Invention. "Employee Invention" means any idea, invention,
software, technique, modification, process, improvement, or similar item,
whether or not reduced to writing or stored electronically or otherwise, and
whether or not protectible by patent, trademark, copyright, or other
intellectual property law, that is crated, conceived, or developed by Employee
or under his direction, whether solely or with others, during or after his
employment by Employer, that relates in any way to, or is useful in any manner
in, the business now or then conducted or proposed to be conducted by Employer
or which is based upon or otherwise derives from or makes use of the
Confidential Information.

      c. Ownership; Disclosure. Any Confidential Information, whether or not
developed by Employee, shall at all times be Employer's exclusive property.
Employee shall promptly disclose any Employee Invention to Employer in writing.

      d. Restrictions. During the term of this Agreement, and for ten (10) years
thereafter, Employee shall not, without Employer's prior written consent:

      (1) Use any Confidential Information for the benefit of himself of any
      other party other than Employer or disclose it to any other person or
      entity;

      (2) Remove any Confidential Information or other documentation, device,
      plan or other record or evidence pertaining to Employer's business from
      Employer's premises, except when specifically authorized to do so in
      pursuit of Employer's business; or

      e. Purpose. The parties acknowledge and agree that the Confidential
Information is a valuable business asset, and that this Section is necessary to
protect Employer's legitimate business interests.

SECTION 6. ADDITIONAL REPRESENTATIONS AND WARRANTIES

In addition to his other representation and warranties set forth in this
Agreement, Employee further represents and warrants as follows:

      a. Employee's performance of this Agreement shall not breach any agreement
to which he is or was a party that requires him to hold any information in
confidence or in trust;

<PAGE>

      b. Employee has not and shall not breach any such Agreement;

      c. Employee shall not bring to Employer or use in connection with his
employment any confidential or proprietary information belonging to another
entity without first delivering a written release of that information to
Employer; and

      d. Employee has provided Employer with an original or true copy of any
employment, non-competition, confidential or proprietary information, or similar
agreement to which he is or has been a party which is now in effect or which may
be in effect during the term of this Agreement.

SECTION 7. REMEDIES

      a. Irreparable Harm. The parties acknowledge and agree that irreparable
harm would result in the event of a breach or threat of a breach by Employee of
Section 5 or the making of any untrue representation or warranty by Employee in
this Agreement. Therefore, in such an event, and notwithstanding any other
provision of this Agreement:

      (1) Employer shall be entitled to a restraining order, order of specific
      performance, or other injunctive relief, without showing actual damage and
      without bond or other security; and

      (2) Employer's obligation to make any payment or provide any benefit under
      this Agreement, including without limitation any severance benefits, shall
      immediately cease.

      b. Remedies Not Exclusive. Employer's remedies under this Section are not
exclusive, and shall not prejudice or prohibit any other rights or remedies
under this Agreement or otherwise. To the extent required to be enforceable by
applicable law, the cessation of Employer's obligation to make payments or
continue benefits under this Section shall be deemed to be in the nature of
liquidated damages and not a penalty.

      c. Cessation of Payments. In the event Employer obtains relief as provided
in this Section, or in the event of Employee's breach of Section 5 or the making
of any untrue representation or warranty by Employee in this Agreement,
Employer's obligation to make any payment or provide any benefit under this
Agreement, including any severance benefits, shall immediately cease.

SECTION 8. LEGAL COUNSEL

      a. Understanding, Voluntary Agreement. Employee represents and warrants
that he has been afforded a reasonable opportunity to review this Agreement, 

<PAGE>

to understand its terms, and to discuss it with an attorney of his choice, and
that he knowingly and voluntarily enters this Agreement.

      b. Waiver of Separate Representation. To the extent Employee has not
engaged separate legal counsel to represent him in connection with this
Agreement, the parties acknowledge an agree that their respective interest in
this Agreement are in conflict, that they have the right to retain independent
counsel, that they have been fully informed about this right and conflicts of
interest that arise from retaining the same legal counsel to represent both of
them, and that this Section constitutes written disclosure of these conflicts.
The parties further affirm that they are waiving separate representation freely,
voluntarily, and with full knowledge of the effect of this waiver. NO party
shall at any time claim that this Agreement is void or unenforceable in any
respect because of the lack of use of independent counsel, or that the legal
counsel who prepared this Agreement acted improperly in doing so.

SECTION 9. CONFIDENTIAL AGREEMENT

This Agreement is confidential, Employee and Employer shall keep its provisions
confidential and shall not disclose them to anyone, including any past, present,
or prospective employee of Employer; provided, that this Section shall not
prohibit Employee from discussing this Agreement in confidential communications
with his family members, attorneys, accountants, or other professional advisors,
provided that the provisions of Section 5 shall at all times apply to
communications with any such persons, and provided Employer may disclose the
terms of this Agreement to the extent it is required by federal or state law,
rule or regulation.

SECTION 10. MISCELLANEOUS PROVISIONS

      a. Waivers. No assent, express or implied, by any party to any breach or
default under this Agreement shall constitute a waiver of or assent to any
breach or default of any other provision of this Agreement or any breach or
default of the same provision on any other occasion.

      b. Entire Agreement, Modification. This Agreement constitutes the entire
agreement of the parties concerning its subject matter and supersedes all other
oral or written understandings, discussions, and agreements, and may be modified
only in a writing signed by both parties.

      c. Binding Effect; No Third Party Beneficiaries This Agreement shall bind
and benefit the parties and their respective heirs, devisees, beneficiaries,
grantees, donees, legal representatives, successors, and assigns. Nothing in
this Agreement shall be construed to confer any rights or benefits on third
parties.

<PAGE>

      d. Assignment. Neither party may assign its interest in this Agreement
without the other's prior written consent; provided that Employer may assign its
interest to another entity which controls, is controlled by, or is under common
control with Employer.

      e. Severability. If any provision of this Agreement, including the
restriction on time and geographic area contained in the Covenant Not to Compete
and Confidential Information provisions of this Agreement, is found in binding
arbitration or by a court or other tribunal of competent jurisdiction to be
invalid or unenforceable, the attempt shall first be made to read that provision
in such a way to make it valid and enforceable in light of the parties' apparent
intent as evidenced by this Agreement. If such a reading is impossible, the
tribunal having jurisdiction may revise the provision in any reasonable manner,
to the extent necessary to make it binding and enforceable. If no such revision
is possible, the offending provision shall be deemed stricken from the
Agreement, and every other provision shall remain in full force and effect.

      f. Forum. All lawsuits, actions, and other proceedings arising from this
Agreement or the transactions it contemplates shall be prosecuted in the
appropriate court in New Jersey and all parties agree to both subject matter and
in personam jurisdiction in that forum.

      g. Governing Law. This Agreement shall be governed by and construed under
the laws of the State of Rhode Island.

      h. Legal Counsel. The parties acknowledge that they have read and fully
understand the contents of this Agreement and execute it after having had an
opportunity to consult with legal counsel.

      IN WITNESS WHEREOF, the partied have executed this Agreement to be
effective as specified above.

PHILIP K. YACHMETZ                          CYTOTHERAPEUTICS, INC.


BY: /S/ PHILIP K. YACHMETZ                  BY: /S/ RICHARD M. ROSE
- -----------------------------               ------------------------------------
    Philip K. Yachmetz                          Richard M. Rose, MD
                                                President  & CEO


<PAGE>

                                                                   EXHIBIT 10.81

                                  EXHIBIT 10.81

                                 JOHN SCHWARTZ
                   AMENDED AND RESTATED CONSULTING AGREEMENT


<PAGE>

                                                                   EXHIBIT 10.81

                      CONSULTING SERVICES AGREEMENT BETWEEN

                             CYTOTHERAPEUTICS, INC.
                                       AND
                                  JOHN SCHWARTZ

THIS CONSULTING SERVICES AGREEMENT (hereinafter referred to as the "Agreement")
effective as of the 27th day of July, 1998 (the "Effective Date"), as amended
and restated as of this 19th day of December, 1998, by and between
CytoTherapeutics, Inc., a corporation organized under the laws of the state of
Delaware with a place of business at 701 George Washington Highway, Lincoln,
Rhode Island 02865 (hereinafter referred to as "Company"), and John Schwartz, an
individual, with a place of business at 110 Atherton Avenue, Atherton,
California 94207 (hereinafter referred to as "Consultant").

In consideration of the promises and mutual covenants contained herein and on
the terms and conditions hereinafter set forth, it is agreed as follows:

1.    PROVISION OF SERVICES - Consultant shall provide to Company, at the
      direction of the Company's Chief Executive Officer and in cooperation with
      the Officers, employees and Directors of the Company, up to twenty (20)
      hours per month of strategic business advice and counsel ("Services"). In
      addition, when requested in writing by the Company's Chief Executive
      Officer, Consultant shall use his business judgment and experience to
      materially participate in the negotiation and consummation of a strategic
      collaboration transaction with third parties designated by the Company's
      Chief Executive Officer ("Additional Services"). Such Additional Services
      are not subject to the twenty (20) hours per month limit established for
      the Services.

2.    COMPENSATION - (a) Company agrees and shall compensate Consultant in
      consideration of his performance of the Services and the Additional
      Services as follows:

      (1)   Within ten (10) business days of the execution of this Agreement,
            and as compensation for Services rendered during the period of
            September 27, 1997 through July 26, 1998, the sum of Fifty Thousand
            Dollars ($50,000) in cash, plus a fully vested option, exercisable
            for a period of 10 years from the Effective Date, to purchase 20,000
            shares 

<PAGE>

            of Company's common stock with an exercise price equal to the
            closing bid price for the shares of the Company's common stock as
            quoted by the Nasdaq stock market for the Effective Date of this
            Agreement ($1.281 per share);

      (2)   For Services to be rendered during the Term of this Agreement,
            Consultant shall be paid the sum of Five Thousand Dollars ($5,000)
            in cash per month on each of the monthly anniversaries of the
            Effective Date, for a total cash compensation of One Hundred Twenty
            Thousand Dollars ($120,000) during the Term of this Agreement. In
            addition, Consultant shall receive upon execution of this Agreement
            an option to purchase 76,000 shares of the Company's common stock
            with an exercise price equal to the closing bid price for the shares
            of the Company's common stock as quoted by the Nasdaq stock market
            for the Effective Date of this Agreement (the "Initial Option"), and
            on July 27, 1999, the first anniversary of the Effective Date, an
            option to purchase 48,000 shares of the Company's common stock with
            an exercise price equal to the closing bid price for the shares of
            the Company's common stock as quoted by the Nasdaq stock market for
            the date of such grant (the "Supplemental Option"). The Initial
            Option shall vest at the rate of 3,167 shares per month for the
            first 23 months, with a final vesting of 3,159 shares in the 24th
            month. The Supplemental Option, when granted, will vest at the rate
            of 2,000 shares per month for 24 months. Both the Initial Option and
            the Supplemental Option shall be exercisable for a period of 10
            years from the date of the initial grant.

      (3)   For the Additional Services, upon the consummation of a strategic
            collaboration transaction with such third party designated by the
            Company's Chief Executive Officer in accordance with Section 1
            hereof (the "Collaboration Agreement"), Consultant shall be paid a
            fee equal to three percent (3%) of the Transaction Consideration, as
            defined below (the "Additional Fee"), in accordance with the
            following terms:

            (i)   Payment of the Additional Fee shall be made within thirty (30)
                  days of the end of each calendar year and each such Additional
                  Fee payment shall be calculated on the basis of the
                  Transaction Consideration actually received by the Company in
                  the immediately preceding calendar year.

            (ii)  The Additional Fee shall be paid fifty percent (50%) in cash
                  and fifty percent (50%) in the form of an option or warrant,
                  at the election of the Company (the "Option"), to purchase

<PAGE>

                  registered shares of the Company's common stock, each such
                  Option being based on the following terms:

            (A)   The number of shares included in each such Option shall be
                  calculated by dividing the sum equal to one and a half percent
                  (1.5%) of the Transaction Consideration actually received in
                  the immediately preceding calendar year by the average closing
                  bid price for the common stock of the Company as quoted by the
                  Nasdaq stock market for the ten (10) trading days beginning
                  thirty (30) days immediately preceding the first public
                  announcement by the Company to occur (the "Closing Bid Price")
                  concerning (x) the consummation of the Collaboration
                  Agreement, or (y) the execution of a Letter of Intent with
                  respect to the Collaboration Agreement, or (z) the
                  confirmation of the existence of any discussions concerning
                  the Collaboration Agreement;

            (B)   Each such Option shall be fully vested upon their issuance,
                  shall bear an exercise price of twenty cents ($ 0.20) per
                  share and shall be exercisable for a period of ten years from
                  the date of their respective issuance.

            (iii) The Additional Fee shall be due and payable to Consultant for
                  each calendar year, or portion thereof, of the original term
                  of the Collaboration Agreement, as envisaged and specified
                  under the terms thereof, provided the Company receives
                  Transaction Consideration within such calendar year or portion
                  thereof. No Additional Fee shall be due and payable to
                  Consultant for any renewal period or extension of the original
                  term of the Collaboration Agreement.

            (iv)  In the event of (a) the sale and transfer of all or
                  substantially all of the assets of the Company, or (b) any
                  transaction as a result of which any one individual or entity
                  owns thirty percent (30%) or more of the common stock of the
                  Company (hereinafter "Change of Control"), then any Additional
                  Fee which would be due to Consultant during the remaining
                  portion of the original term of the Collaboration Agreement,
                  as envisaged and specified under the terms of thereof, shall
                  be accelerated and become due and payable within thirty (30)
                  days of such Change of Control. Solely for the purposes of
                  this Section 2(a)(3)(iv), the accelerated Additional Fee shall
                  be calculated on all Transaction Consideration due during the
                  remaining portion of the original term of the Collaboration
                  Agreement, but shall exclude any contingent payments which
                  would only be due upon the occurrence of a milestone event.


<PAGE>

                  For purposes of this Agreement, "Transaction Consideration"
                  means the total proceeds and other consideration paid and to
                  be paid or contributed and to be contributed to the Company
                  pursuant to a Collaboration Agreement and any amendment,
                  modification, novation, accord and satisfaction thereof,
                  including: (i) cash; (ii) notes, loans, and letters of credit
                  at the face value thereof, (iii) securities, and other
                  tangible and intangible property at the fair market value
                  thereof; and (iv) payments to be made to Company in
                  installments, such as annual sponsored research payments and
                  milestone payments for the achievement of established
                  criteria, but excluding royalties.

      (b)   In addition to the compensation set forth in paragraph 2(a) above,
            the Company agrees to reimburse Consultant for reasonable
            out-of-pocket expenses actually incurred by Consultant in the
            performance of the Services and the Additional Services, including,
            but not limited to telephone and facsimile charges and calls, car
            rental, lodging, travel expenses, meals and associated expenses.

3.    TERM - This Agreement shall enter into force and effect as of the
      Effective Date and shall remain in force and effect for a period of
      twenty-four (24) months (the "Term"). In the event this Agreement shall
      not be renewed beyond such Term, any provisions which by their nature
      and/or provisions extend beyond the Term of this Agreement shall survive
      the expiration of this Agreement and be binding on the parties hereto with
      full force and effect.

4.    CONFIDENTIALITY OF INFORMATION AND DOCUMENTS - In the event that Company
      shall submit information and/or documents to Consultant in order to permit
      him to perform the Services required under this Agreement, Consultant
      shall keep such information and/or documents in the strictest confidence
      using the same degree of care that Consultant uses in safeguarding his own
      confidential information both during and after the completion of the
      services under this Agreement and for a period of ten (10) years after
      completion of the Services, unless it shall receive from Company the
      consent of Company in writing to disclose it. However, nothing herein
      shall be interpreted as preventing Consultant from disclosing and/or using
      said information or documents which (i) are already rightfully in the
      possession of Consultant without obligation of confidence, but were not
      obtained directly or indirectly from Company or its affiliates; or (ii)
      are independently developed by Consultant not as part of the Services
      rendered or called for under the terms of this Agreement; or (iii) are or
      become available to the general public without breach of this Agreement;
      or (iv) are rightfully received by Consultant from a third party who is
      not under obligation of confidence, but who 

<PAGE>

      did not obtain them directly or indirectly from Company or its affiliates;
      or (v) are required to be disclosed pursuant to law or court order, or as
      may be authorized by Company.

5.    LIABILITY OF CONSULTANT - In furnishing Company with the Services provided
      herein, Consultant shall not be liable to Company or its creditors for
      errors of judgment or for any matters, except for willful malfeasance, bad
      faith or gross negligence in the performance of the Services or Additional
      Services or the reckless disregard of its obligations and duties under the
      terms of this Agreement. It is further agreed and understood that
      Consultant may rely upon information furnished to it by Company which
      Consultant reasonably believes to be accurate and reliable and that,
      except as provided herein, Consultant shall not be accountable for any
      loss suffered by Company by the reason of Company's action or non-action
      on the basis of any advice, recommendation or approval of Consultant,
      except as provided above.

6.    INDEPENDENT CONTRACTOR - Execution of this Agreement in no way creates,
      nor shall this Agreement be interpreted or construed as creating, an
      employment, agency, partnership or joint venture relationship between
      Company and Consultant and it is understood Consultant will be acting as
      an independent contractor

7.    MISCELLANEOUS

      a.    OTHER ACTIVITIES OF CONSULTANT. Company recognizes that Consultant
            now renders and may continue to render management and other advisory
            services to other companies which may or may not have policies and
            conduct activities similar to those of Company. Consultant shall be
            free to render such advice and other services and Company hereby
            consents thereto. Consultant shall not be required to devote its
            full time and attention to the performance of the Services or the
            Additional Services hereunder to Company, but shall only devote so
            much of its time and attention as Company and Consultant mutually
            deem reasonable and necessary for such Services and Additional
            Services.

      b.    CONTROL. Nothing contained herein shall be deemed to require Company
            to take any action contrary to its Certificate of Incorporation or
            By-Laws, or any applicable statute or regulation, or to deprive its
            Officers and Board of Directors of their responsibility for any
            control of the conduct or the affairs of Company.


<PAGE>

      c.    This Agreement, read together with the letters addressed by the
            Company to Consultant dated July 27, 1998 and August 11, 1998
            (copies of which are attached hereto), shall constitute the entire
            agreement between Company and Consultant relating to the Services to
            be performed, and no representations, promises, understandings, or
            agreements, oral or otherwise, not herein contained shall be of any
            force or effect. No modification or waiver of any provision of this
            Agreement shall be valid unless it is in writing and signed by both
            Company and Consultant. This Agreement shall be binding upon the
            heirs, executors, administrators, successors and assigns of the
            parties hereto.

      d.    This Agreement shall be governed by, and construed in accordance
            with, the laws of the State of Delaware.

      e.    In the event of any litigation between the parties to declare or
            enforce any provision of this Agreement, the prevailing party shall
            be entitle to recover from the losing party, in addition to any
            other recovery and costs, reasonable attorney's fees and costs
            incurred in such litigation, in both the trial and in the appellate
            courts.

IN WITNESS WHEREOF, the parties hereto, by their duly authorized
representatives, have signed this Agreement as of the date first above written.


JOHN SCHWARTZ                                   CYTOTHERAPEUTICS, INC.


By:                                             By:
   ----------------------------                     Richard M. Rose, M.D.   
      John Schwartz                                 President &             
                                                    Chief Executive Officer 
                                                

<PAGE>

                                                                   EXHIBIT 10.82

                                  EXHIBIT 10.82

                                  JOHN SCHWARTZ
                              DIRECTOR'S AGREEMENT


<PAGE>

                                                                   EXHIBIT 10.82

                             CYTOTHERAPEUTICS, INC.
                         701 GEORGE WASHINGTON HIGHWAY
                          LINCOLN, RHODE ISLAND 02865
401.288.1000


                                          December 19, 1998


John Schwartz
110 Atherton Avenue
Atherton, California 94027


Dear John:

      This letter agreement (this "Agreement") will confirm our agreement with
      respect to your service with CytoTherapeutics, Inc. (the "Company") under
      the terms and conditions that follow:

            1. Position and Duties.

            (a) As soon as reasonably practicable following the receipt by the
Company of a copy of this Agreement signed by you (but in no event later than 30
days following such receipt), pursuant to the by-laws of the Company, the Board
of Directors (the "Board") shall (i) undertake to increase by one (1) the number
of seats on the Board, and within five (5) business days following such increase
in the number of seats, (ii) elect you to such seat and appoint you to serve as
Chairman of the Board. Commencing on the date of such election and appointment
(such date, the "Effective Date"), you shall serve as Chairman for a Term
expiring at the Annual Meeting of Stockholders in May, 2001. In addition, and
without further compensation, you agree to serve as a member of the Board and of
the Board of Directors of one or more of the Company's Affiliates, as defined
below, if so elected or appointed from time to time. While subject to any
provision of this Agreement, you shall perform your duties to the best of your
abilities, maintain loyalty to the Company, and shall take no action that would
directly or indirectly promote any competitor or injure the Company's interests.
Subject to the foregoing, you may engage in other business or charitable
activities to the extent that they do not interfere or create a conflict with
your obligations under this Agreement.

            (b) Specifically, but not exclusively, your duties and
responsibilities will be (i) to preside at all meetings of the Board and
stockholders; (ii) to create such committees of the Board as you deem prudent
and advisable for the management of the Company, to designate the membership of
such Board committees and to designate the powers of the Board that such
committees shall have and may exercise in the management of the affairs of the
Company, in each case subject to the approval of the full Board; (iii) to
nominate, in consultation with the President & Chief Executive Officer of the
Company, the two next successive qualified additional members (A) for election
to the Board by the Board prior to the next Annual Meeting of Stockholders, or
(B) for nomination by the Board for election to the Board at the next Annual
Meeting of Stockholders, or (C) for election to the Board by the Board
subsequent to the next Annual Meeting of Stockholders but prior to the Annual
Meeting of Stockholders in May, 2000, such nominees to be so elected or
nominated by the Board unless the Board reasonably determines that such nominees
are not qualified to serve as members of the Board; (iv) to provide strategic
guidance and advice to the senior management of the Company with respect to the
management of the operations of the Company; (v) and to provide support and
guidance to the senior management of the Company in their efforts (A) to manage
and direct the strategic development and implementation of the Company's
business plan, and (B) to secure, promote and maintain the appropriate financing
and capital structure of the Company. You will report directly to and serve at
the discretion of the Board.

            2. Compensation; Time Commitment.

            a. For all services that you perform for the Company and its
Affiliates as Chairman the Company will provide you as compensation (i) the
remaining compensation provided for inthat certain Consulting Services
Agreement, dated July 27, 1998, as amended contemporaneously herewith, between
you and the Company (the "Consulting Agreement"),(ii) any other compensation
provided for in Paragraphs 2 and 3 of this Agreement, , and (iii) Thirty Six
Thousand Dollars ($36,000) per year, plus a fee of One Thousand Five Hundred
Dollars ($1,500) per Board meeting or Committee meeting (if held at a date and
time separate from the Board meeting) where you are physically present, plus
Five Hundred Dollars ($500) per 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 (this cash compensation plus any other compensation
provided for herein shall be referred to as the "Compensation"). Notwithstanding
any provision of the Consulting Agreement to the contrary,for administrative
convenience purposes, the Company will aggregate all cash compensation due to
you under the Consulting Agreement and this Agreement in any calendar quarter
and issue one payment in arrears to you.

            b. As Chairman of the Board of Directors, you will be expected to
devote no less than fifteen (15) business days per calendar quarter to the
performance of your duties and responsibilities collectively under this
Agreement and the Consulting 

<PAGE>

Agreement (hereinafter "Duties and Responsibilities"). In the event you devote
more than fifteen (15) days in any calendar quarter to the performance of your
Duties and Responsibilities, you shall, within thirty (30) days of the end of
the calendar quarter, provide an accounting to the President and Chief Executive
Officer of the Company detailing the actual time spent during such preceding
calendar quarter. After review and approval by the President and Chief Executive
Officer of the Company you will be promptly further compensated for additional
days exceeding fifteen (15) in any calendar quarter at the rate of One Thousand
Five Hundred Dollars ($1,500) per day. All such additional payments made shall
be promptly reported by the President and Chief Executive Officer to the
Compensation Committee of the Board (the "Compensation Committee") for
subsequent ratification by such Compensation Committee, such ratification not to
delay the payment of any such additional payments.

            c. The elements of your duties, the respective time commitment
required for such duties and your Compensation will be periodically reviewed by
the Compensation Committee of the Board (the "Compensation Committee"), in no
event less than once annually, in order to determine whether under then present
circumstances any increase or decrease adjustment is required or appropriate.
Any such increase or decrease shall be made only by mutual agreement, confirmed
in writing.

            3. Stock Options. Through the CytoTherapeutics, Inc. 1992 Equity
Incentive Plan (the "Incentive Plan"), and subject to the terms and conditions
of the Incentive Plan, you will be granted effective as of the Effective Date an
option to acquire 40,000 shares of the common stock ("Common Stock") of the
Company (the "Time-Based Option") with an exercise price per share of Common
Stock subject to such Time-Based Option equal to the fair market value of a
share of Common Stock on the date of grant. Notwithstanding any provision of the
Incentive Plan, subject to your continued service as Chairman of the Company,
the Time-Based Option will vest over twenty-nine (29) months from the Effective
Date at the rate of one-twenty ninth (1/29) per month on the last day of each
month during the ensuing twenty-nine (29) months. Except as otherwise expressly
provided herein and in Paragraph 5 hereof, the Time-Based Option shall be
governed by the terms of the Incentive Plan, as in effect from time to time.

            4. Benefits. You will be entitled to participate in any and all
benefit plans from time to time in effect for members of the Board generally,
except to the extent that such plans are duplicative of benefits otherwise
provided to you under this Agreement. Such participation shall be subject to (a)
the terms of the applicable plan documents, (b) generally applicable policies of
the Company and (c) the discretion of the Board and plan administrators, as
provided for in or contemplated by such plans. The Company shall reimburse you
for all expenses reasonably incurred by you in connection with your performance
of your duties hereunder on a basis consistent with Company policies.

<PAGE>

            5. Term; Termination; Effect of Termination. Unless earlier
terminated pursuant to this Paragraph 5, your position as Chairman of the
Company shall commence on the Effective Date and shall expire at the Annual
Meeting of Stockholders of the Company held in May, 2001, unless extended
thereafter by mutual agreement between you and the Company at that time (such
period shall be referred to herein as the "Term" of this Agreement").

            a. The Company may remove you from your position as Chairman other
than for "Cause" at any time upon an affirmative vote of the majority of the
members of the Board.

            b. The Company may, by an affirmative vote of the majority of the
members of the Board then in office, remove you from your position as Chairman
upon written notice to you in the event that you become disabled during your
service through any illness, injury, accident or condition of either physical or
psychological nature and, as a result, you are unable to perform substantially
all of your duties and responsibilities hereunder for an aggregate of ninety
(90) days during any three hundred and sixty-five (365) calendar days.

            c. The Company may, by an affirmative vote of the majority of the
members of the Board then in office, terminate or remove you from your position
as Chairman for Cause at any time upon written notice to you setting forth in
reasonable detail the nature of such Cause. The following, as determined by the
Company in its reasonable judgment, shall constitute "Cause" for termination:
(i) your willful failure to perform your material duties and responsibilities to
the Company and its Affiliates (including, without limitation, those duties and
responsibilities described in Section 1) ; (ii) fraud, embezzlement or other
material dishonesty with respect to the Company or any of its Affiliates; or
(iii) your conviction of, or plea of nolo contendere to, a felony.

            d. You may resign from your position as Chairman at any time upon
written notice to the Company

e. The effect of termination under various circumstances shall be:

                  (i) In the event your service as Chairman is terminated
pursuant to this Paragraph 5, but you remain as a member of the Board, then for
the remainder of your Term as a Director, the Company will revise your
Compensation and provide you (A) cash compensation equal to the then current
cash compensation provided to other members of the Company's Board of Directors,
(B) revise the number of unvested shares subject to the Time-Based Option
granted hereunder to reduce the number of such unvested shares from that point
forward to the number of shares then provided to other members of the Company's
Board of Directors during the similar period, with no change to the exercise
price or vesting schedule (i.e.: the revised number of unvested shares shall be
based on the number of months remaining between the termination of your service
as Chairman and May, 2001 times 1/29th of the 20,000 shares currently 

<PAGE>

provided Directors in their Time-Based Option or 1/29th of such other amount
then provided to Directors), and (C) all of your compensation under the
Consulting Agreement shall continue to be paid in accordance with and subject to
the terms of the Consulting Agreement.

                  (ii) In the event your service as Chairman is terminated
pursuant to Paragraphs 5.a, 5.b, or 5.d and then you resign from the Board in
the entirety, or are removed from the Board pursuant to the By-Laws of the
Company, then (A) the Company shall have no further obligation to you other than
for Compensation earned through the date of such resignation, except that (B)
all of your compensation under the Consulting Agreement shall continue to be
paid in accordance with and subject to the terms of the Consulting Agreement and
(C) notwithstanding anything in this Agreement or in the Incentive Plan to the
contrary, any shares of Common Stock subject to the Time-Based Option shall
remain exercisable for a period of one (1) year from such date.

                  (iii) In the event your service as Chairman is terminated
pursuant to Paragraphs 5.c. and then you resign from the Board in the entirety,
or are removed from the Board pursuant to the By-Laws of the Company, then (A)
the Company shall have no further obligation to you other than for Compensation
earned through the date of such resignation, except that (B) all of your
compensation under the Consulting Agreement shall continue to be paid in
accordance with and subject to the terms of the Consulting Agreement.

            6. Indemnification; Legal Fees. During the Term and thereafter, the
Company shall indemnify you to the full extent permitted by law and the by-laws
of the Company for all expenses, costs, liabilities and legal fees which you may
incur in the discharge of your duties hereunder. In addition, the Company shall
pay any reasonable legal fees which you may incur related to the negotiation and
consummation of this Agreement, such payments to be made directly to your
counsel in accordance with the Company's normal accounting practices upon
receipt of a detailed copy of the bill for services rendered from your counsel.

            7. No Employment. Execution of this Agreement in no way creates, nor
shall this Agreement be interpreted as creating, an employment, agency,
partnership or joint venture between you and the Company.

            8. Assignment. Neither you nor the Company may make any assignment
of this Agreement or any interest herein, by operation of law or otherwise,
without the prior written consent of the other; provided, however, that the
Company may assign its rights and obligations under this Agreement without your
consent to any Person with whom the Company shall hereafter affect a
reorganization, consolidation or merger or to whom the Company transfers all or
substantially all of its properties or assets. This Agreement shall inure to the
benefit of and be binding upon you and the 

<PAGE>

Company and each of your respective successors, executors, administrators, heirs
and permitted assigns.

            9. Waiver. Except as otherwise expressly provided in this Agreement,
no waiver of any provision hereof shall be effective unless made in writing and
signed by the waiving party. The failure of either party to require performance
of any term or obligation of this Agreement, or the waiver by either party of
any breach of this Agreement, shall not prevent any subsequent enforcement of
such term or obligation or be deemed a waiver of any subsequent breach.

            10. Severability. If any portion or provision of this Agreement
shall to any extent be declared illegal or unenforceable by a court of competent
jurisdiction, then the remainder of this Agreement, or the application of such
portion or provision in circumstances other than those as to which it is so
declared illegal or unenforceable, shall not be affected thereby, and each
portion and provision of this Agreement shall be valid and enforceable to the
fullest extent permitted by law.

            11. Notices. Except as otherwise expressly provided herein, any
notices, requests, demands and other communications provided for by this
Agreement shall be in writing and shall be effective when delivered in person or
deposited in the United States mail, postage prepaid, registered or certified,
and addressed to you at your last known address on the books of the Company or,
in the case of the Company, at its main office, attention of the President &
Chief Executive Officer, with a copy to the Company's Secretary.

            12. Captions. The captions and headings in this Agreement are for
convenience only and in no way define or describe the scope or content of any
provision of this Agreement.

            13. Effect on Consulting Agreement. During the Term and
notwithstanding any termination, if any, of (a) this Agreement, (b) your service
as Chairman, and/or (c) your services as a member of the Board of Directors for
any reason whatsoever, or (d) any breach of this Agreement by you, the
compensation, terms and conditions of the Consulting Agreement shall continue in
full force and effect for the duration of the term of the Consulting Agreement.

            14. Entire Agreement. This Agreement sets forth the entire agreement
and understanding between you and the Company and supersedes all prior
communications, agreements and understandings, written and oral, with respect to
the terms and conditions of your position as Chairman of the Board of Directors.
This Agreement may not be amended or modified, except by an agreement in writing
signed by you and the President & Chief Executive Officer or other specifically
authorized representative of the Company.


<PAGE>

            15. Governing Law. This Agreement shall be governed, construed and
enforced in accordance with the laws of Delaware, without regard to the conflict
of laws principles thereof.

            16. No Conflicting Agreements. You hereby represent to the Company
that neither your execution and delivery of this Agreement nor your acceptance
of the position of Chairman of the Board of the Company nor your performance
under this Agreement will conflict with or result in a breach of any of the
terms, conditions or provisions of any agreement to which you are a party or are
bound or any order, injunction, judgment or decrees of any court or governmental
authority or any arbitration award applicable to you.

            17. Compliance with Agreement. The Company's obligations under this
Agreement and its obligation to deliver stock under the terms of the stock
options granted pursuant to the terms of this Agreement are conditioned on your
compliance with the terms and conditions of this Agreement.

If the foregoing is acceptable to you, please sign the enclosed copy of this
letter in the space provided below and return it to me, whereupon this letter
and such copy will constitute a binding agreement between you and the Company on
the basis set forth above as of the date first above written.

                                          Sincerely yours, 
                                          CYTOTHERAPEUTICS, INC.


                                          By:
                                          -------------------------------
                                                Richard M. Rose, M.D.
                                                President &
Accepted and Agreed:                            Chief Executive Officer


- -------------------------------
John J. Schwartz

                   Date:
                        -------------------------

<PAGE>

                                                                   EXHIBIT 10.83

                                  EXHIBIT 10.83

                           Scripps Research Institute
                               License Agreement
                                     98-086

<PAGE>

                                                                   EXHIBIT 10.83

                               LICENSE AGREEMENT

      This License Agreement is entered into and made effective as of this
____day of October, 1998, by and between THE SCRIPPS RESEARCH INSTITUTE, a
California nonprofit public benefit corporation ("Scripps") located at 10550
North Torrey Pines Road, La Jolla, California 92037, and STEMCELLS, INC., a
California corporation ("Licensee") with offices at 701 George Washington
Highway, Lincoln, Rhode Island 02865, a wholly-owned subsidiary of
CytoTherapeutics, Inc. ("CTI"), with respect to the facts set forth below.

                                    RECITALS

      A. Scripps and Licensee have entered into a Research Funding and Option
Agreement effective as of November 14, 1997 (the "Research Agreement"), pursuant
to which Licensee agreed to fund certain research conducted in Dr. Nora
Sarvetnick's laboratory at Scripps (the "Research Program").

      B. Scripps is engaged in fundamental scientific biomedical and biochemical
research, including research relating to pancreatic stem and progenitor cells,
as more particularly described herein.

      C. Licensee is engaged in research and development of stem and progenitor
cells for the diagnosis, treatment and prophylaxis of diseases and other
conditions in humans and animals.

      D. Scripps has disclosed to Licensee certain technology described in that
certain invention disclosure, a copy of which is attached hereto as Exhibit A
and incorporated herein by reference (the "Invention(s)")

      E. Scripps has the exclusive right to grant a license to the technology
described in Exhibit A, subject to certain rights of the U.S. Government to use
such technology for its own purposes, resulting from the receipt by Scripps of
certain funding from the U. S. Government.

      F. Scripps desires to grant to Licensee, and Licensee wishes to acquire,
an exclusive worldwide right and license to the technology described in the
Exhibit A and to certain patent rights and know-how of Scripps with respect
thereto, subject to the terms and conditions set forth herein, with a view to
developing and marketing products within the Field (as defined below).

                                    AGREEMENT

NOW, THEREFORE, in consideration of the mutual covenants and conditions set
forth herein, Scripps and Licensee hereby agree as follows:


<PAGE>

1. Definitions. Capitalized terms shall have the meaning set forth below.

      1.1 Affiliate. The term "Affiliate" shall mean any entity which directly
or indirectly controls, is controlled by or is under common control with
Licensee. The term "control" as used herein means the possession of the power to
direct or cause direction of the management and the policies of an entity,
whether through the ownership of a majority of the outstanding voting securities
or by contract or otherwise.

      1.2 Confidential Information. The term "Confidential Information" shall
mean any and all proprietary or confidential information of Scripps or Licensee
which may be exchanged between the parties at any time and from time to time
during the term of this Agreement. Information shall not be considered
confidential to the extent that it:

            (a) Is publicly disclosed through no fault of any party hereto,
      either before or after it becomes known to the receiving party; or

            (b) Was known to the receiving party prior to the date of this
      Agreement, which knowledge was acquired independently and not from another
      party hereto (or such party's employees); or

            (c) Is subsequently disclosed to the receiving party in good faith
      by a third party who has a right to make such disclosure; or

            (d) Has been published by a third party as a matter of right.

      1.3 Field. The term "Field" shall mean [*   ].

      1.4 Licensed Product. The term "Licensed Product" shall mean a product,
the manufacture, sale or use of which would but for the license granted herein,
infringe a Valid Claim in the country for which such product is sold. Without
limiting the foregoing, Licensed Product shall also include a product the
manufacture, sale or use of a particular product would but for the license
granted herein infringe a Valid Claim in the United States and at least two (2)
Major Countries, in such case irrespective of where such product is made, sold
or used and irrespective of whether such product is covered by a Valid Claim in
the country where sold.

      1.5 Major Countries. The term "Major Countries" shall mean France,
Germany, Italy and the United Kingdom.

      1.6 Net Sales. The term "Net Sales" shall mean the total amount invoiced
to third parties on sales of Licensed Products by Licensee, its Affiliates, or
Sublicensees, for which royalties are due under Article 3 below, less the
following reasonable and customary deductions to the extent applicable to such
invoiced amounts: (i) all trade, cash and quantity credits, discounts, refunds
or 



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

government rebates; (ii) amounts for claims, allowances or credits for returns,
retroactive price reductions, or chargebacks; (iii) packaging, handling fees and
prepaid freight, sales taxes, duties and other governmental charges (including
value added tax); and (iv) provisions for uncollectible accounts determined in
accordance with reasonable accounting practices, consistently applied to all
products of the selling party; provided, however, that in the case of 
Patient-Specific Licensed Products, "Net Sales" shall equal [*   ] of the 
foregoing amounts (after the deductions described in (i) through (iv) above). 
For purposes of the foregoing, it is understood that Net Sales shall include 
only the amount invoiced for materials consisting of Licensed Products (less 
the foregoing deductions and adjustments) and shall not include charges 
related to services (other than cell separation and expansion) performed in 
connection with the sale of such Licensed Products; accordingly, Net Sales 
shall not include, without limitation, charges for apheresis, reinfusion, 
surgical procedures, hospital stays or the like. For the removal of doubt, 
Net Sales shall not include sales by Licensee to its Affiliates for resale, 
provided that if Licensee sells a Licensed Product to an Affiliate for 
resale, Net Sales shall include the amounts invoiced by such Affiliate to 
third parties on the resale of such Licensed Product. In the event that 
Licensee grants a sublicense hereunder, and receives payments based upon the 
Sublicensee's sales of Licensed Products, Licensee may upon approval by 
Scripps, which approval shall not be unreasonably withheld, substitute the 
definition of "Net Sales," used by the Sublicensee to calculate payments to 
Licensee in place of the foregoing definition of "Net Sales" for purposes of 
calculating royalties payable to Scripps on such Sublicensee's sales.

      1.7 Patient-Specific Licensed Product. The term "Patient-Specific Licensed
Product shall mean a Licensed Product that includes either (i) autologous cells
from the patient; or (ii) nonautologous cells that otherwise are not intended
for use in all patients (such as Licensed Products that are fetal cells
expressing an HLA-type compatible with the particular patient but not optimally
compatible with patients who have a different HLA type).

      1.8 Scripps Patent Rights. The term "Scripps Patent Rights" shall mean all
rights resulting from:

            (a) all worldwide patent and patent applications claiming the
      Scripps Technology described in Exhibit A hereto (the "Existing Patents");
      and

            (b) all divisions, continuations, continuations-in-part, patents of
      addition, and substitutions of the Existing Patents, together with all
      registrations, reissues, reexaminations or extensions of any kind with
      respect to any of the foregoing patents to the extent the same claim
      Scripps Technology.

      From time to time during the term of this Agreement the parties agree to
record and update on Exhibit B all patents and patent applications within the
Scripps Patent Rights

      In the event that Scripps and Licensee are joint owners of an invention by
reason of the fact that personnel of both Scripps and Licensee are joint
inventors of such invention, it is understood 



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

that the Scripps Patent Rights include only Scripps' rights as a joint owner of
the patent applications and patents that claim such joint invention.

      1.9 Scripps Technology. The term "Scripps Technology" shall mean so much
of the technology as is proprietary to Scripps that was developed in performance
of the Research Program and in the disclosure provided to Licensee pursuant to
Section 3.2 or 3.3 of the Research Agreement, a copy of which is attached as
Exhibit A hereto and incorporated herein by reference, together with materials,
information and know-how related thereto from the Research Program as described
Exhibit A whether or not the same is eligible for protection under the patent
laws of the United States or elsewhere, and whether or not any such processes
and technology, or information related thereto, would be enforceable as a trade
secret or the copying of which would be enjoined or restrained by a court as
constituting unfair competition.

      1.10 Sublicensee. The term "Sublicensee" shall mean any non-Affiliate
third party to whom Licensee has granted the right to manufacture and sell
Licensed Products, with respect to Licensed Products made and sold by such third
party.

      1.11 Valid Claim. The term "Valid Claim" shall mean a claim of an issued
and unexpired patent or a claim of a pending patent application within the
Scripps Patent Rights which has not been held unpatentable, invalid or
unenforceable by a court or other government agency of competent jurisdiction
and has not been admitted to be invalid or unenforceable through reissue,
reexamination, disclaimer or otherwise; provided, however, that if the holding
of such court or agency is later reversed by a court or agency with overriding
authority, the claim shall be reinstated as a Valid Claim with respect to Net
Sales made after the date of such reversal. Notwithstanding the foregoing
provisions of this Section 1. 11, if a claim of a pending patent application
within the Scripps Patent Rights has not issued as a claim of an issued patent
within the Scripps Patent Rights, within five (5) years after the filing date
from which such claim takes priority, such pending claim shall not be a Valid
Claim for purposes of this Agreement.

2. License Terms and Conditions.

      2.1 Grant of License.

      (a) Scripps hereby grants to Licensee an exclusive, worldwide license,
including the right to sublicense, to: make, use, sell, import, export or
otherwise distribute Licensed Products; practice any method, process or
procedure, and otherwise exploit the Scripps Patent Rights; and to have any of
the foregoing performed on its behalf by a third party, in each case solely
within the Field, subject to the terms of this Agreement.

      (b) Scripps hereby grants to Licensee a non-exclusive, worldwide license,
including the right to sublicense to and under the Scripps Technology for the
purpose of exercising its rights and licenses under the Scripps Patent Rights.

<PAGE>

      2.2 Royalties. In consideration for the exclusive license granted pursuant
to Section 2.1 hereof, Licensee shall pay to Scripps a continuing royalty the
following percentages of Net Sales of each Licensed Product by Licensee, its 
Affiliates and Sublicensees: (i) [*   ] of Net Sales in Patent Countries and 
(ii) [*   ] in Non-Patent Countries. For purposes of calculating royalties 
due hereunder, a "Patent Country" shall mean, with respect to a particular 
Licensed Product, a country in which at the time of the sale of such Licensed 
Product in such country, the manufacture, use or sale of such Licensed 
Product would infringe a Valid Claim in such country; and a "Non-Patent 
Country" shall mean, with respect to such Licensed Product, a country which a 
the time of sale of such Licensed Product in such country is not a Patent 
Country.

      2.3 Milestone Payments. As additional consideration for the exclusive
license granted pursuant to Section 2.1 hereof, Licensee agrees to pay to
Scripps upon the first occurrence of each milestone specified below for the
first Licensed Product to meet such milestone:

                     MILESTONES                                   PAYMENT
                     ----------                                   -------

1.    First initiation of Phase II Trials for the first           $[*   ]
      Licensed Product.

2.    First initiation of Phase III Trials for the first          $[*   ]
      Licensed Product.

3.    First receipt of government approval to market and          $[*   ]
      distribute the first Licensed Product in the United 
      States or the first Major Country.

For purposes of the foregoing milestones, "Phase II Trials" shall mean that
portion of the clinical studies for the FDA submission and approval process
which provides for the initial trials of a Licensed Product for the purposes of
determining the efficacious therapeutic dose range and evaluating safety in the
proposed therapeutic indication as more fully defined in 21 C.F.R. ss.
312.21(b), or a similar clinical study in a country other than the United
States; and "Phase III Trials" shall mean that portion of the clinical studies
for the FDA submission and approval process which provides for trials of a
Licensed Product on sufficient numbers of patients to establish the safety and
efficacy of such Licensed Product to support regulatory approval in the proposed
application as more fully defined in 21 C.F.R. ss. 3122.21(c), or similar
clinical study in a country other than the United States.

      2.4   Combination Products.

            2.4.1 Definition of Combination Product. As used herein, the term
"Combination Product" shall mean a Licensed Product which cannot be
manufactured, used or sold without infringing Scripps Patent Rights licensed
hereunder in the country where sold which 



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

is sold with another product, component or service for which no royalty would be
due hereunder if sold separately.

            2.4.2 Royalty Payable on Combination Products. The royalty payable
on Combination Products shall be the royalty rate set forth in Section 2.2 above
based on a pro rata portion of Net Sales of Combination Products in accordance
with the following formula:

                                  A
                               X= -
                                  A + B, where

                        X = the pro rata portion of Net Sales attributable to
                        Scripps Patent Rights or other Scripps Technology
                        licensed herein (expressed as a percentage), and

                        A = the fair market value of the Licensed Product
                        component, and

                        B = the fair market value of all other components
                        (product, component or service) in the Combination
                        Product.

The fair market values described above shall be determined by the parties hereto
in good faith. Notwithstanding the foregoing, in the event that there is no
separate fair market values of the Licensed Product and such other product(s),
component(s) and/or services(s), then the Net Sales shall be as reasonably
allocated by Licensee between such Licensed Product and such other product(s),
component(s) and/or service(s), based upon their relative importance and
proprietary position, subject to the consent of Scripps, which consent shall not
be unreasonably withheld.

      2.5 Multiple Royalties. If Licensee, its Affiliate or Sublicensee is
required to pay a non-Affiliate third party amounts with respect to a Licensed
Product under agreements for patent rights or other technologies which Licensee,
its Affiliate or Sublicensee, in its reasonable judgment, determines are
necessary or desirable to license or acquire with respect to such Licensed
Product, Licensee may deduct such amount owing to such non-Affiliate third
parties (prior to any reductions) from the royalty owing to Scripps for the sale
of such Licensed Product pursuant to Section 2.2 above. Notwithstanding the
foregoing provisions of this Section 2.5, in no event shall the royalties due to
Scripps pursuant to Section 2.2 above be so reduced to less than fifty percent
(50%) of the amount that would otherwise be due Scripps thereunder.

      2.6   Quarterly Payments.

            2.6.1 Sales by Licensee. With regard to Net Sales made by Licensee
or its Affiliates, royalties shall be payable by Licensee quarterly, within
sixty (60) days after the end of each calendar quarter, based upon the Net Sales
of Licensed Products during such preceding calendar

<PAGE>

quarter, commencing with the calendar quarter in which the first commercial sale
of any Licensed Product is made.

            2.6.2 Sales by Sublicensees. With regard to Net Sales made by
Sublicensees of Licensee or its Affiliates, royalties shall be payable by
Licensee quarterly, within ninety (90) days after the end of each calendar
quarter, based upon the Net Sales of Licensed Products by such Sublicensee
during such preceding calendar quarter, commencing with the calendar quarter in
which the first commercial sale of any Licensed Product is made by such
Sublicensee.

      2.7 Term of License. Unless terminated sooner in accordance with the
provisions of this Agreement, the term of this license shall expire when the
last of the royalty obligations set forth has expired (i.e., until expiration,
revocation or invalidation of the last patent or the abandonment of the last
application within the Scripps Patent Rights, whichever is later).
Notwithstanding the foregoing, if applicable government regulations require a
shorter term and/or a shorter term of exclusivity than provided for herein, then
the term of this License Agreement shall be so shortened or this License
Agreement shall be amended to provide for a non-exclusive license, and, in such
event, the parties shall negotiate in good faith to reduce appropriately the
royalties payable as set forth under the section heading "Royalties" hereof.
Notwithstanding anything herein to the contrary, Licensee's license under
Section 2. l(b) with respect to the Scripps Technology shall survive the
expiration, (but not an earlier termination, except as provided in Section 8.6
below) of this Agreement.

      2.8 Sublicense. Licensee shall have the sole and exclusive right to grant
sublicenses to any party with respect to the rights conferred upon Licensee
under this Agreement, provided, however, that any such sublicense shall be
subject in all respects to the restrictions, exceptions, royalty obligations,
reports, termination provisions, and other provisions contained in this
Agreement. Wtthout limiting the foregoing, Licensee agrees to provide Scripps a
copy of each such sublicense agreement within thirty (30) days of the execution
thereof. Licensee shall pay Scripps, or cause its Affiliate or Sublicensee to
pay Scripps, the same royalties on all Net Sales of such Affiliate or
Sublicensee the same as if said Net Sales had been made by Licensee. Each
Affiliate and Sublicensee shall report its Net Sales to Scripps through
Licensee, which Net Sales shall be aggregated with any Net Sales of Licensee for
purposes of determining the Net Sales upon which royalties are to be paid to
Scripps.

      2.9 Reports. Licensee shall furnish to Scripps at the same time as each
royalty payment is made by Licensee, a detailed written report of Net Sales of
the Licensed Products and the royalty due and payable thereon, including a
description of any offsets or credits deducted therefrom, on a
product-by-product and country-by-country basis, for the calendar quarter upon
which the royalty payment is based.

      2.10 Records. Licensee shall keep, and cause its Affiliates and
Sublicensees to keep, full, complete and proper records and accounts of all
sales of Licensed Products in sufficient detail to enable the royalties payable
on Net Sales of each Licensed Product to be determined. Scripps shall have the
right to appoint an independent certified public accounting firm approved by
Licensee, which approval shall not be unreasonably withheld, to audit the
records of Licensee, its Affiliates and Sublicensees as necessary to verify the
royalties payable pursuant to 

<PAGE>

this Agreement. Licensee, its Affilliates and Sublicensees shall pay to Scripps
an amount equal to any additional royalties to which Scripps is entitled as
disclosed by the audit, plus interest thereon at the rate of one and one-half
percent (1.5%) per month. Such audit shall be at Scripps' expense; provided,
however, that if the audit discloses that Scripps was underpaid royalties with
respect to the period covered by the audit by at least five percent (5%), then
Licensee, its Affiliates or Sublicensee, as the case may be, shall reimburse
Scripps for all reasonable out-of-pocket audit costs. Scripps may exercise its
right of audit as to each of Licensee, its Affiliates or Sublicensees no more
frequently than once in any calendar year. The accounting firm shall disclose to
Scripps only information relating to the accuracy of the royalty payments.
Licensee, its Affiliates and Sublicensees shall preserve and maintain all such
records required for audit for a period of three (3) years after the calendar
quarter to which the record applies.

      2.11 Foreign Sales. The remittance of royalties payable on sales outside
the United States shall be payable to Scripps in United States Dollar
equivalents at the official rate of exchange of the currency of the country from
which the royalties are payable, as quoted in the Wall Street Journal for the
last business day of the calendar quarter in which the royalties are payable. If
the transfer of or the conversion into the United States Dollar equivalents of
any such remittance in any such instance is not lawful or possible, the payment
of such part of the royalties as is necessary shall be made by the deposit
thereof, in the currency of the county where the sale was made on which the
royalty was based to the credit and account of Scripps or its nominee in any
commercial bank or trust company of Scripps' choice located in that country,
prompt written notice of which shall be given by Licensee to Scripps and except
as set forth in Section 2.10 above, Licensee shall have no further obligation
with respect to such royalties.

      2.12 Foreign Taxes. Any tax required to be withheld by Licensee under the
laws of any foreign country for the accounts of Scripps shall be promptly paid
by Licensee for and on behalf of Scripps to the appropriate governmental
authority, and Licensee shall use its best efforts to furnish Scripps with proof
of payment of such tax together with official or other appropriate evidence
issued by the applicable government authority. Any such tax actually paid on
Scripps' behalf shall be deducted from royalty payments due Scripps hereunder.

      2.13 Single Payments. The parties hereto acknowledge that the parties may
enter into multiple license agreements with respect to technologies arising out
of the Research Agreement, including this Agreement (collectively, the "Scripps
License Agreements") pursuant to which Licensee will owe royalties and milestone
payments. Notwithstanding anything herein to the contrary, with respect to any
unit of Licensed Product only a single royalty shall be due to Scripps at the
highest applicable rate for such unit regardless if such Licensed Product is
covered by more than one Valid Claim or would be a Licensed Product under more
than one Scripps License Agreement. (For example, if a product sold by Licensee
is a Licensed Product under this Agreement for which Licensee owes Scripps a
royalty of [*   ] of Net Sales and Licensee would otherwise owe Scripps a 
royalty of [*   ] of Net Sales of such product under another Scripps License 
Agreement, Licensee's royalty obligation to Scripps shall be fulfilled by 
paying Scripps [*   ] of Net Sales with respect to sales of such License 
Product.) Likewise, with respect to the milestone payments under Section 2.3 
above, once such milestone payment has been paid for a Licensed Product under 
any Scripps License Agreement then Licensee's obligation to pay such 
milestone shall be deemed to be fulfilled with respect to all Scripps License 
Agreement, regardless of whether the product for which such a milestone 
payment was paid was a "Licensed Product" for purposes of a particular 
Scripps License Agreement or not. (For example, if a



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

Licensee initiates Phase II Trials for a product, which product falls within the
definition of "Licensed Product" under this Agreement and pays Scripps the
corresponding [*   ] payment, Licensee shall have no further obligation to pay
any amounts to Scripps with respect to any other product under any Scripps
License Agreement upon the initiation of Phase II Trials for a Licensed Product
whether or not the product for which Licensee initially paid such milestone
payment is a Licensed Product for purposes of any other Scripps License
Agreement.)

3. Patent Matters.

      3.1 Patent Prosecution and Maintenance. From and after the date of this
Agreement, the provisions of this Section 3 shall control the prosecution and
maintenance of any patent or patent application included within Scripps Patent
Rights. Subject to the requirements, limitations and conditions set forth in
this Agreement, Scripps shall direct and control (i) the preparation, filing and
prosecution of the United States and foreign patent applications within Scripps
Patent Rights (including any interferences and foreign oppositions) and (ii)
maintain the patents issuing therefrom. Scripps shall select the patent
attorney, subject to Licensee's written approval, which approval shall not be
unreasonably withheld. Both parties hereto agree that Scripps may, at its sole
discretion, utilize Scripps' Office of Patent Counsel in lieu of outside counsel
for patent prosecution and maintenance described herein, and the fees and
expenses incurred by Scripps with respect to work done by such Office of Patent
Counsel shall be paid as set forth below. Licensee shall have full rights of
consultation with the patent attorney so selected on all matters relating to
Scripps Patent Rights. Scripps shall use its best efforts to implement all
reasonable requests made by Licensee with regard to the preparation, filing,
prosecution and/or maintenance of the patent applications and/or patents within
Scripps Patent Rights.

      3.2 Information to Licensee. Scripps agrees to use reasonable efforts to
(i) keep Licensee informed as to the filing, prosecution and maintenance of
patents and patent applications within the Scripps Patent Rights, (ii) furnish
to Licensee copies of documents relevant to any such filing, prosecution and
maintenance and (iii) allow Licensee reasonable opportunity to comment on
documents filed with any patent office which would affect the Scripps Patent
Rights or Licensee' rights hereunder.

      3.3 Patent Costs. Licensee acknowledges and agrees that Scripps does not
have independent funding to cover patent costs, and that the license granted
hereunder is in part in consideration for Licensee's assumption of patent costs
and expenses as described herein. Licensee shall pay for all expenses incurred
by Scripps pursuant to Section 3.1 hereof. In addition, Licensee connection with
Scripps Patent Rights licensed hereunder. Licensee agrees to pay all such past
and future patent expenses directly or to reimburse Scripps for the payment of
such expenses within sixty (60) days after Licensee receives an itemized invoice
therefor. In the event Licensee elects to discontinue payment for the filing,
prosecution and/or maintenance of any patent application and/or patent within
Scripps Patent Rights, any such patent application or patent shall be excluded
from the definition of Scripps Patent Rights and from the scope of the license
granted under this Agreement, and all rights relating thereto shall revert to
Scripps and may be freely licensed by Scripps. Licensee shall give Scripps at
least sixty (60) days' prior written notice of such election. No such notice
shall have any effect on Licensee's obligations to pay expenses incurred up to
the effective date of such election.



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  Commission

<PAGE>

      3.4 Ownership. Subject to any joint or mutual ownership of Licensee by
virtue of joint inventorship of inventions covered therein, the patent
applications filed and patent applications obtained by Scripps pursuant to
Section 3.1 hereof shall be owned solely by Scripps, assigned to Scripps and
deemed a part of Scripps Patent Rights.

      3.5 Scripps Right to Pursue Patent. If at any time during the term of this
Agreement, Licensee's rights with respect to Scripps Patent Rights are
terminated, Scripps shall have the right to take whatever action Scripps deems
appropriate to obtain or maintain the corresponding patent protection at its own
expense. If Scripps pursues patents under this Section 3.5, Licensee agrees to
cooperate fully, including by providing, at no charge to Scripps, all
appropriate technical data and executing all necessary legal documents.

      3.6 Prosecution by Licensee. If Scripps elects not to file, prosecute or
maintain any patent application or patent within the Scripps Patent Rights or
pay any fee related thereto, in any country Scripps shall promptly notify
Licensee of such election, but in no case later than sixty (60) prior to any
required action relating to the filing, prosecution or maintenance of such
patent application or patent. In such event, if Licensee elects to take over the
filing, prosecution and/or maintenance of one or more patents or patent
applications within the Scripps Patent Rights, Licensee shall have the right, at
its option, to control the filing, prosecution and/or maintenance of any such
patent applications or patents within the Scripps Patent Rights at its own
expense. In which case Licensee shall keep Scripps reasonably informed on
matters regarding such filing, prosecution and maintenance.

      3.7 Infringement.

      3.7.1 Enforcement. If either party determines that a third party is
making, using or selling a product that may infringe the Scripps Patent Rights,
that party shall notify the other party in writing.

            (a) Licensee shall have the first right (itself or through others),
at its sole option, to bring suit to enforce the Scripps Patent Rights, and/or
to defend any declaratory judgment action with respect thereto, in each case
with respect to the manufacture, sale or use of a product within the Field;
provided, however, that Licensee shall keep Scripps reasonably informed as to
the defense and/or settlement of such action. Scripps shall have the right to
participate in any such action with counsel of its own choice at its own
expense.

            (b) In the event Licensee elects not to initiate an action to
enforce the Scripps Patent Rights against a commercially significant
infringement by a third party within the Field, within one (1) year of a request
by Scripps to do so, (or within such shorter period which may be required to
preserve the legal rights of Scripps under the laws of the relevant government),
Scripps may initiate such action at its expense with Licensee' prior written
consent, which consent shall not be unreasonably withheld. Licensee shall have
the right to participate in any such action with counsel of its own choice at
its own expense.

            (c) All recoveries received by a party from an action to enforce the
Scripps Patent Rights shall be first applied to reimburse the controlling
party's and then the non-controlling party's unreimbursed expenses, including
without limitation, reasonable attorney's fees and court costs. Any remainder
shall, to the extent the same pertains to an infringement of 

<PAGE>

the Scripps Patent Rights, be divided [*   ] to Licensee and [*   ] to 
Scripps.

            3.7.2 Defense. If Licensee, its Affiliate, Sublicensee, distributor
or other customer is sued by a third party charging infringement of patent
rights that dominate a claim of the Scripps Patent Rights or that cover other
Related Material with respect to the manufacture, use, distribution or sale of a
Licensed Product, Licensee will promptly notify Scripps. As between the parties
to this Agreement, Licensee will be entitled to control the defense in any such
action(s) and withhold [*   ] of the royalties related to such Licensed
Product otherwise payable to Scripps and use the withheld royalties to reimburse
the legal defense costs, attorneys' fees and liability incurred in such
infringement suit(s). Notwithstanding the foregoing, Licensee agrees to withhold
only that portion of such royalties as may reasonably be necessary to reimburse
amounts in accordance with this Section 3 .7.2. If Licensee is required to pay a
royalty to a third party to make and/or sell a Licensed Product as a result of a
final judgment or settlement, such amounts may be deducted from the running
royalties payable to Scripps hereunder in relation to such Licensed Product;
provided that such royalties shall not be so reduced by more than [*   ]. 
Subject to the provisions of Section 4.3 below, Licensee agrees to indemnify 
and hold Scripps harmless from any costs, expenses or liability arising out 
of all such infringements or charges of infringement.

            3.7.3 Cooperation. In any suit, action or other proceeding in
connection with enforcement and/or defense of the Scripps Patent Rights, each
party hereto agrees to cooperate fully, including without limitation by joining
as a party plaintiff and executing such documents as the other party may
reasonably request. Without limiting the foregoing, upon the request of and, at
the expense of a party controlling any suit, action or other proceeding pursuant
to this Article 3, the other party shall make available at reasonable times and
under appropriate conditions all relevant personnel, records, papers,
information, samples, specimens and other similar materials in such other
party's possession.

            3.7.4 No Implied Obligations. Except as expressly provided in this
Section 3.7, neither party has any obligation to bring or prosecute actions or
suits against any third party for patent infringement.

4. Obligations Related to Commercialization.

      4.1 Commercial Development Obligation. In order to maintain the license
granted hereunder in force, Licensee shall use reasonable efforts and due
diligence to develop Scripps Technology and Scripps Patent Rights which are
licensed hereunder into commercially viable Licensed Products, as promptly as is
reasonably and commercially feasible, and thereafter to produce and sell
reasonable quantities of Licensed Products. Licensee shall keep Scripps
generally informed as to Licensee's progress in such development, production and
sale, including its efforts, if any, to sublicense Scripps Technology and
Scripps Patent Rights, and Licensee shall deliver to Scripps an annual written
report and such other reports as Scripps may reasonably request. The parties
hereto acknowledge and agree that achievement of mutually agreeable milestones
shall be evidence of compliance by Licensee with its commercial development
obligations hereunder. Notwithstanding the foregoing, if Licensee believes that
it cannot, within the exercise of prudent and reasonable business judgment,
perform any mutually agreed upon milestones within the time period required
therefor, Licensee may request an 



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

extension of time for the performance date to a date that Licensee believes to
be reasonable and prudent and Scripps shall agree to any requested extension
which is not more than one (l) year in length from the originally required date
and will not unreasonably withhold consent to requests for longer extensions. In
the event Scripps has a reasonable basis to believe that Licensee is not using
reasonable efforts and due diligence as required hereunder, upon notice by
Scripps to Licensee which specifies the basis for such belief, Scripps and
Licensee shall negotiate in good faith to attempt to mutually resolve the issue.
In the event Scripps and Licensee cannot agree upon any matter related to
Licensee's commercial development obligations, the parties agree to utilize
arbitration pursuant to Section 10.2 hereof in order to resolve the matter. If
the arbitrator determines that Licensee has not complied with its obligations
hereunder, and such default is not cured within sixty (60) days after the
arbitrator's decision, Scripps may terminate Licensee's rights under this
Agreement.

      4.2 Governmental Approvals and Marketing of Licensed Products. Licensee
shall be responsible for obtaining all necessary governmental approvals for the
development, production, distribution, sale and use of any Licensed Product, at
Licensee's expense, including, without limitation, any safety studies. Licensee
shall have sole responsibility for any warning labels, packaging and
instructions as to the use of Licensed Products and for the quality control for
any Licensed Product.

      4.3 Indemnity. Licensee hereby agrees to indemnify, defend and hold
harmless Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents from and against any
liability or expense arising from any product liability claim asserted by any
party as to any Licensed Product or any claims arising from the use of any
Scripps Patent Rights or Scripps Technology pursuant to this Agreement. Such
indemnity and defense obligation shall apply to any product liability or other
claims, including without limitation, personal injury, death or property damage,
made by employees, subcontractors, sublicensees, or agents of Licensee, as well
as any member of the general public. Notwithstanding the foregoing, Licensee's
obligation to provide indemnification under this Section 4 3 shall be subject to
each party seeking indemnification hereunder (i) promptly notify Licensee in
writing of any claim, suit or proceeding with respect to which the party intends
to claim such indemnification, (ii) give Licensee sole control of the defense
and/or settlement thereof, and (iii) provide Licensee, at Licensee's expense,
with reasonable assistance and full information with respect to such claim, suit
or proceeding. Licensee shall not settle any claim, suit or proceeding subject
to this Section 4.3 or otherwise consent to an adverse judgment in such claim,
suit or proceeding if the same materially diminishes the rights or interests of
the indemnified party without the express written consent of such party.
Licensee shall have no obligation for any claim, suit or proceeding if the party
seeking indemnification makes any settlement regarding such claim, suit or
proceeding without the prior written consent of Licensee, which consent shall
not be unreasonably withheld. Licensee shall use its best efforts to have
Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents named as additional insured
parties on any product liability insurance policies maintained by Licensee, its
Affiliates and sublicensees applicable to Licensed Products.

      4.4 Patent Marking. To the extent required by applicable law, Licensee
shall mark all Licensed Products or their containers in accordance with the
applicable patent marking laws.

<PAGE>

      4 5 No Use of Name. Except as required by law, the use of the name "The
Scripps Research Institute", " Scripps", or any variation thereof in connection
with the advertising or sale of Licensed Products is expressly prohibited.

      4.6 U.S. Manufacture. To the extent required by applicable United States
laws, if at all, Licensee agrees that Licensed Products will be manufactured in
the United States, or its territories, subject to such waivers as may be
required, or obtained, if at all, from the United States Department of Health
and Human Services, or its designee.

      4 7 Foreign Registration. Licensee agrees to register this Agreement with
any foreign governmental agency which requires such registration, and Licensee
shall pay all costs and legal fees in connection therewith. In addition,
Licensee shall assure that all foreign laws affecting this Agreement or the sale
of Licensed Products are fully satisfied.

5. Limited Warranty. Scripps hereby represents and warrants that subject to the
rights of the United States Government (i) it has sole right and power to enter
into this Agreement and grant the rights and licenses granted herein; (ii)
Scripps is and shall be the owner of the entire right, title, and interest in
and to the Scripps Patent Rights; (iii) Scripps has not previously granted and
will not grant any rights in the Scripps Patent Rights that are inconsistent
with the rights and licenses granted to Licensee herein; and (iv) to the best of
its knowledge, there are no claims of third parties that would call into
question the rights of Scripps to grant to Licensee the rights contemplated
hereunder. EXCEPT AS PROVIDED IN THIS SECTION 5, NEITHER PARTY MAKES ANY
WARRANTIES OR CONDITIONS (EXPRESS, IMPLIED, STATUTORY OR OTHERWISE) WITH RESPECT
TO THE SUBJECT MATTER HEREOF. SPECIFICALLY, SCRIPPS MAKES NO OTHER WARRANTIES
CONCERNING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT, INCLUDING WITHOUT LIMITATION, ANY EXPRESS OR IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AS TO SCRIPPS PATENT RIGHTS,
SCRIPPS TECHNOLOGY OR ANY LICENSED PRODUCT. SCRIPPS MAKES NO WARRANTY OR
REPRESENTATION AS TO THE VALIDITY OR SCOPE OF SCRIPPS PATENT RIGHTS, OR THAT ANY
LICENSED PRODUCT WILL BE FREE FROM AN INFRINGEMENT ON PATENTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES, OR THAT NO THIRD PARTIES ARE IN
ANY WAY INFRINGING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT.

6. Interests in Intellectual Property Rights.

      6.1 Preservation of Title. Scripps shall retain full ownership and title
to Scripps Technology, and Scripps Patent Rights licensed hereunder and shall
use its reasonable best efforts to preserve and maintain such full ownership and
title, subject to Licensee fully performing all of its obligations under this
Agreement.

      6 2 Rovalty-free License to Improvements. Licensee hereby grants to
Scripps a non-exclusive, royalty-free license to any improvement to Scripps
Technology developed by Licensee during the term of this Agreement, to use for
Scripps own non-cornmercial research purposes or grant to other nonprofit
institutions for their non-commercial research purposes.

<PAGE>

      6.3 Governmental Interest. Licensee and Scripps acknowledge that Scripps
has received, and expects to continue to receive, funding from the United States
Government in support of Scripps' research activities. Licensee and Scripps
acknowledge and agree that their respective rights and obligations pursuant to
this Agreement shall be subject to Scripps' obligations and the rights of the
United States Government, if any, which arise or result from Scripps' receipt of
research support from the United States Government, including without
limitation, the grant by Scripps to the United States a non-exclusive,
irrevocable, royalty-free license to Scripps Technology and Scripps Patent
Rights licensed hereunder for governmental purposes.

      6.4 Reservation of Rights. Scripps reserves the right to use for any
non-commercial research purposes and the right to allow other nonprofit
institutions to use for any non-commercial research purposes any Scripps
Technology and Scripps Patent Rights licensed hereunder, without Scripps or such
other institutions being obligated to pay Licensee any royalties or other
compensation.

7. Confidentiality and Publication.

      7.1 Treatment of Confidential Information. The parties agree that during
the term of this Agreement and for ten ( 10) years thereafter, a party receiving
Confidential Information of the other party will (i) maintain in confidence such
Confidential Information to the same extent such party maintains its own
proprietary industrial information, (ii) not disclose such Confidential
Information to any third party without prior written consent of the other party
and (iii) not use such Confidential Information for any purpose except those
permitted by this Agreement.

      7.2 Permitted Usage. Notwithstanding the provisions of Section 7.1 above,
the receiving party may use or disclose Confidential Information of the
disclosing party to the extent necessary to exercise its rights hereunder
(including commercialization and/or sublicensing of Scripps Patent Rights and
Scripps Technology) or fulfill its obligations and/or duties hereunder and in
filing for, prosecuting or maintaining any proprietary rights, prosecuting or
defending litigation, complying with applicable governmental regulations and/or
submitting information to tax or other governmental authorities; provided that
if the receiving party is required by law to make any public disclosures of
Confidential Information of the disclosing party, to the extent it may legally
do so, it will give reasonable advance notice to the disclosing party of such
disclosure and will use its reasonable efforts to secure confidential treatment
of Confidential Information prior to its disclosure (whether through protective
crders or otherwise).

      7.3 Publications. Licensee agrees that Scripps shall have a right to
publish in accordance with its general policies and subject to Section 6.2 of
the Research Agreement.

      7.4 Publicity. Except as otherwise provided herein or required by law, no
party shall originate any publication, news release or other public
announcement, written or oral, whether in the public press, stockholders'
reports, or otherwise, relating to this Agreement or to any sublicense
hereunder, or to the performance hereunder or any such agreements, without the
prior written approval of the other party, which approval shall not be
unreasonably withheld. Scientific publications published in accordance with
Section 7.3 of this Agreement shall not be construed as publicity governed by
this Section 7.4.

<PAGE>

8. Term and Termination.

      8.1 Term. Unless terminated sooner in accordance with the terms set forth
herein, this Agreement, and the license granted hereunder, shall terminate as
provided in Section 2.7 hereof.

      8.2 Termination Upon Default. Any one or more of the following events
shall constitute an event of default hereunder: (i) the failure of a party to
pay any amounts when due hereunder and the expiration of thirty (30) days after
receipt of a written notice requesting the payment of such amount; (ii) the
failure of a party to perform any material obligation required of its to be
performed hereunder, and the failure to cure within sixty (60) days after
receipt of notice from the other party specifying in reasonable detail the
nature of such default. Upon the occurrence of any event of default, the
non-defaulting party may deliver to the defaulting party written notice of
intent to terminate, such termination to be effective upon the date set forth in
such notice.

      Such termination rights shall be in addition to and not in substitution
for any other remedies that may be available to the non-defaulting party.
Termination pursuant to this Section 8.2 shall not relieve the defaulting party
from liability and damages to the other party for breach of this Agreement.
Waiver by either party of a single default or a succession of defaults shall not
deprive such party of any right to terminate this Agreement arising by reason of
any subsequent default.

      Notwithstanding the foregoing provisions of this Section 8.2, if the party
alleged to be in default of this Agreement disputes in good faith such default
within the applicable cure period, the other party's right to terminate shall be
stayed until it has been determined in accordance with Section 10 2 below of
this Agreement that the party alleged to be in default was actually in default
and such defaulting party fails to comply with its obligations hereunder within
the applicable cure period.

      8 3 Termination Upon Bankruptcy or Insolvency. This Agreement may be
terminated by Scripps giving written notice of termination to Licensee upon the
filing of bankruptcy or bankruptcy of Licensee or the appointment of a receiver
of any of Licensee's assets, or the making by Licensee of any assignment for the
benefit of creditors, or the institution of any proceedings against Licensee
under any bankruptcy law which proceeding is not dismissed with prejudice within
ninety (90) days from its initiation. Termination shall be effective upon the
date specified in such notice.

      8.4 Termination by Licensee. Any provision herein notwithstanding,
Licensee may terminate this Agreement, in its entirety or as to any particular
patent or patent application within the Scripps Patent Rights, or as to any
particular Licensed Product, at any time by giving Scripps at least ninety (90)
days prior written notice. From and after the effective date of a termination
under this Section 8 4 with respect to a particular patent or application, such
patent(s) and patent application(s) in the particular country shall cease to be
within the Scripps Patent Rights for all purposes of this Agreement, and all
rights and obligations of Licensee with respect to such patent(s) and patent
application(s) shall terminate. From and after the effective date of a
termination under this Section 8.3 with respect to a particular Licensed
Product, the license 

<PAGE>

granted under Section 2.1 above shall terminate with respect to such Licensed
Product, and the same shall cease to be a Licensed Product for all purposes of
this Agreement. Upon a termination of this Agreement in its entirety under this
Section 8.4, all rights and obligations of the parties shall terminate, except
as provided in Section 8.5 below.

      8.5 Rights Upon Expiration. Neither party shall have any further rights or
obligations upon the expiration of this Agreement upon its regularly scheduled
expiration date with respect to this Agreement, other than the obligation of
Licensee to make any and all reports and payments for the final quarter period.
Provided, however, that upon such expiration, each party shall be required to
continue to abide by its non-use and non-disclosure obligations as described in
Section 7.1, and Licensee shall continue to maintain records under Section 2.10
and abide by its obligation to indemnify Scripps as described in Section 4.3 and
by its obligations under Section 6.2 hereof.

      8.6   Rights Upon Termination.

            8.6.1 Accrued Obligations. Termination of this Agreement for any
reason shall not release either party hereto from any liability which at the
time of such termination has already accrued to the other party.

            8.6.2 Inventory. In the event this Agreement is terminated for any
reason, Licensee shall provide Scripps with a written inventory of all Licensed
Products that Licensee and its Affiliates have in process of manufacture, in use
or in stock and Licensee and its Affiliates shall have the right to sell or
otherwise dispose of such Licensed Products for a period not to exceed six (6)
months from the effective date of such termination, all subject to the payment
to Scripps royalties and provision of reports pursuant to this Agreement.

            8.6.3 Sublicenses. Upon termination of this Agreement by Scripps for
any reason, any sublicense granted by Licensee hereunder shall survive, provided
that upon request by Scripps, such Sublicensee promptly agrees in writing to be
bound by the applicable terms of this Agreement.

            8.6.4 Survival. Sections 2.10,4.3,6.2,7.1 and 10 shall survive any
termination of this Agreement. Except as otherwise provided in this Section 8,
all rights and obligations of the parties under this Agreement shall terminate
upon termination of this Agreement.

9. Assignment: Successors.

      9.1 Assignment. Neither this Agreement nor any rights granted hereunder
may be assigned or transferred by Licensee except (i) to an Affiliate of
Licensee or (ii) to a successor in interest to all or substantially all of the
business assets of Licensee, whether by way of a merger, consolidation, sale of
all or substantially all of Licensee's assets, change of control or similar
transaction, without the prior written consent of Scripps.

      9.2 Binding Upon Successors and Assigns. Subject to the limitations on
assignment herein, this Agreement shall be binding upon and inure to the benefit
of any successors in interest and assigns of Scripps and Licensee. Any such
successor or assignee of Licensee's

<PAGE>

interest shall expressly assume in writing the performance of all the terms and
conditions of this Agreement to be performed by Licensee.

10. General Provisions.

      10.1 Independent Contractors. The relationship between Scripps and
Licensee is that of independent contractors. Scripps and Licensee are not joint
venturers, partners, principal and agent, master and servant, employer or
employee, and have no other relationship other than independent contracting
parties. Scripps and Licensee shall have no power to bind or obligate each other
in any manner, other than as is expressly set forth in this Agreement.

      10 2 Arbitration. Any controversy or claim arising out of or relating to
this Agreement, or the breach thereof, shall be settled by binding arbitration
in accordance with the Commercial Arbitration Rules of the American Arbitration
Association ("AAA"), and the procedures set forth below. In the event of any
inconsistency between the Rules of AAA and the procedures set forth below, the
procedures set forth below shall control. Judgment upon the award rendered by
the arbitrators may be enforced in any court having jurisdiction thereof.

      10.2.1 Location. The location of the arbitration shall be in the County of
San Diego in the State of California.

      10.2.2 Selection of Arbitrators. The arbitration shall be conducted by a
panel of three neutral arbitrators who are independent and disinterested with
respect to the parties, this Agreement, and the outcome of the arbitration. Each
party shall appoint one neutral arbitrator, and these two arbitrators so
selected by the parties shall then select the third arbitrator. If one party has
given written notice to the other party as to the identity of the arbitrator
appointed by the party, and the party thereafter makes a written demand on the
other party to appoint its designated arbitrator within the next ten days, and
the other party fails to appoint its designated arbitrator within ten days after
receiving said written demand, then the arbitrator who has already been
designated shall appoint the other two arbitrators.

      10.2.3 Discovery. Unless the parties mutually agree in writing to some
additional and specific pre-hearing discovery, the only pre-hearing discovery
shall be (a) reasonably limited production of relevant and non-privileged
documents, and (b) the identification of witnesses to be called at the hearing,
which identification shall give the witness's name, general qualifications and
position, and a brief statement as to the general scope of the testimony to be
given by the witness. The arbitrators shall decide any disputes and shall
control the process concerning these pre-hearing discovery matters. Pursuant to
the Rules of AAA, the parties may subpoena witnesses and documents for
presentation at the hearing.

      10.2.4 Case Management. Prompt resolution of any dispute is important to
both parties; and the parties agree that the arbitration of any dispute shall be
conducted expeditiously. The arbitrators are instructed and directed to assume
case management initiative and control over the arbitration process (including
scheduling of events, pre-hearing discovery and activities, and the conduct of
the hearing), in order to complete the arbitration as expeditiously as is
reasonably practical for obtaining a just resolution of the dispute.

<PAGE>

      10 2 5 Remedies. The arbitrators may grant any legal or equitable remedy
or relief that the arbitrators deem just and equitable, to the same extent that
remedies or relief could be granted by a state or federal court, provided
however, that no punitive damages may be awarded. No court action may be
maintained seeking punitive damages. The decision of any two of the three
arbitrators appointed shall be binding upon the parties.

      10.2.6 Expenses. The expenses of the arbitration, including the
arbitrators' fees, expert witness fees, and attorney's fees, may be awarded to
the prevailing party, in the discretion of the arbitrators, or may be
apportioned between the parties in any manner deemed appropriate by the
arbitrators. Unless and until the arbitrators decide that one party is to pay
for all (or a share) of such expenses, both parties shall share equally in the
payment of the arbitrators' fees as and when billed by the arbitrators.

      10.2.7 Confidentiality. Except as set forth below, the parties shall keep
confidential the fact of the arbitration, the dispute being arbitrated, and the
decision of the arbitrators. Notwithstanding the foregoing, the parties may
disclose information about the arbitration to persons who have a need to know,
such as directors, trustees, management employees, witnesses, experts,
investors, attorneys, lenders, insurers, and others who may be directly
affected. Additionally, if a party has stock which is publicly traded, the party
may make such disclosures as are required by applicable securities laws.
Further, if a party is expressly asked by a third party about the dispute or the
arbitration, the party may disclose and acknowledge in general and limited terms
that there is a dispute with the other party which is being (or has been)
arbitrated. Once the arbitration award has become final, if the arbitration
award is not promptly satisfied, then these confidentiality provisions shall no
longer be applicable.

      10.3 Entire Agreement Modification. This Agreement sets forth the entire
agreement and understanding between the parties as to the subject matter hereof.
There shall be no amendments or modifications to this Agreement, except by a
written document which is signed by both parties. It is understood that the
Research Agreement is separate and independent from this Agreement and
termination of either agreement shall not operate to terminate or otherwise
effect the rights and obligations of the parties under the other agreement.

      10.4 California Law. This Agreement shall be construed and enforced in
accordance with the laws of the State of California.

      10. 5 Limitation of Liability. NEITHER PARTY SHALL BE LIABLE TO THE OTHER
PARTY OR ANY THIRD PARTY FOR ANY SPECIAL, CONSEQUENTIAL, EXEMPLARY OR INCIDENTAL
DAMAGES (INCLUDING LOST OR ANTICIPATED REVENUES OR PROFITS RELATING TO THE
SAME), ARISING FROM ANY CLAIM RELATING TO THIS AGREEMENT, WHETHER SUCH CLAIM IS
BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE) OR OTHERWISE, EVEN IF AN
AUTHORIZED REPRESENTATIVE OF SUCH PARTY IS ADVISED OF THE POSSIBILITY OR
LIKELIHOOD OF SAME.

      10.6 No Implied Obligations. Licensee's sole obligation to exploit the
Scripps Patent Rights and Scripps Technology is as set forth in Section 4.1.
Nothing in this Agreement shall be deemed to require Licensee to otherwise
exploit the Scripps Patent Rights or Scripps Technology 

<PAGE>

nor prevent Licensee from commercializing products similar to or competitive
with a Licensed Product.

      10.7 Headings. The headings for each article and section in this Agreement
have been inserted for convenience of reference only and are not intended to
limit or expand on the meaning of the language contained in the particular
article or section.

      10.8 Severability. Should any one or more of the provisions of this
Agreement be held invalid or unenforceable by a court of competent jurisdiction,
it shall be considered severed from this Agreement and shall not serve to
invalidate the remaining provisions thereof. The parties shall make a good faith
effort to replace any invalid or unenforceable provision with a valid and
enforceable one such that the objectives contemplated by them when entering this
Agreement may be realized.

      10.9 No Waiver. Any delay in enforcing a party's rights under this
Agreement or any waiver as to a particular default or other matter shall not
constitute a waiver of such party's rights to the future enforcement of its
rights under this Agreement, excepting only as to an express written and signed
waiver as to a particular matter for a particular period of time.

      10.10 Name. Whenever there has been an assignment by Licensee as permitted
by this Agreement, the term "Licensee" as used in this Agreement shall also
include and refer to, if appropriate, such assignee.

      10.11 Notices. Any notices required by this Agreement shall be in writing,
shall specifically refer to this Agreement and shall be sent by registered or
certified airmail, postage prepaid, or by telefax, telex or cable, charges
prepaid, or by overnight courier, postage prepaid and shall be forwarded to the
respective addresses set forth below unless subsequently changed by written
notice to the other party:

      For Scripps       The Scripps Research Institute
                        10550 North Torrey Pines Road, TPC-9
                        La Jolla, California 92037
                        Attn: Director, Technology Development
                        Fax No.: (619) 784-9910

      For Licensee:     StemCells, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: Research Director
                        Fax No.: (401) 333-0684

      with a copy to:   CytoTherapeutics, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: General Counsel
                        Fax No.: (401) 334-9152

<PAGE>

Notice shall be deemed delivered upon the earlier of (i) when received, (ii)
three (3) days after deposit into the mail, or (iii) the date notice is sent via
telefax, telex or cable, (iv) the day immediately following delivery to
overnight courier (except Sunday and holidays).

      10.12 Compliance with U. S. Laws. Nothing contained in this Agreement
shall require or permit Scripps or Licensee to do any act inconsistent with the
requirements of any United States law, regulation or executive order as the same
may be in effect from time to time.

      IN WITNESS WHEREOF, the parties have executed this Agreement by their duly
authorized representatives as of the date set forth above.


SCRIPPS:                               LICENSEE:


THE SCRIPPS RESEARCH INSTITUTE         STEMCELLS, INC.


By:                                    By:                                
- -------------------------------        -----------------------------------


Title:                                 Title:
- -------------------------------        -----------------------------------

<PAGE>

                                    EXHIBIT A

                            DISCLOSURE OF TECHNOLOGY

[*   ]

























* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

                                    EXHIBIT B

                              SCRIPPS PATENT RIGHTS

[*   ]




















* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

                                                                   EXHIBIT 10.84


                           Scripps Research Institute
                                License Agreement
                                     98-058


<PAGE>

                                                                   EXHIBIT 10.84


                                LICENSE AGREEMENT

      This License Agreement is entered into and made effective as of this
____day of October, 1998, by and between THE SCRIPPS RESEARCH INSTITUTE, a
California nonprofit public benefit corporation ("Scripps") located at 10550
North Torrey Pines Road, La Jolla, California 92037, and STEMCELLS, INC., a
California corporation ("Licensee") with offices at 701 George Washington
Highway, Lincoln, Rhode Island 02865, a wholly-owned subsidiary of
CytoTherapeutics, Inc. ("CTI"), with respect to the facts set forth below.

                                    RECITALS

      A. Scripps and Licensee have entered into a Research Funding and Option
Agreement effective as of November 14, 1997 (the "Research Agreement"), pursuant
to which Licensee agreed to fund certain research conducted in Dr. Nora
Sarvetnick's laboratory at Scripps (the "Research Program").

      B. Scripps is engaged in fundamental scientific biomedical and biochemical
research, including research relating to pancreatic stem and progenitor cells,
as more particularly described herein.

      C. Licensee is engaged in research and development of stem and progenitor
cells for the diagnosis, treatment and prophylaxis of diseases and other
conditions in humans and animals.

      D. Scripps has disclosed to Licensee certain technology described in that
certain invention disclosure, a copy of which is attached hereto as Exhibit A
and incorporated herein by reference (the "Invention(s)")

      E. Scripps has the exclusive right to grant a license to the technology
described in Exhibit A, subject to certain rights of the U.S. Government to use
such technology for its own purposes, resulting from the receipt by Scripps of
certain funding from the U. S. Government.

      F. Scripps desires to grant to Licensee, and Licensee wishes to acquire,
an exclusive worldwide right and license to the technology described in the
Exhibit A and to certain patent rights and know-how of Scripps with respect
thereto, subject to the terms and conditions set forth herein, with a view to
developing and marketing products within the Field (as defined below).

                                    AGREEMENT

      NOW, THEREFORE, in consideration of the mutual covenants and conditions
set forth herein, Scripps and Licensee hereby agree as follows:

<PAGE>

1. Definitions. Capitalized terms shall have the meaning set forth below.

      1.1 Affiliate. The term "Affiliate" shall mean any entity which directly
or indirectly controls, is controlled by or is under common control with
Licensee. The term "control" as used herein means the possession of the power to
direct or cause direction of the management and the policies of an entity,
whether through the ownership of a majority of the outstanding voting securities
or by contract or otherwise.

      1.2 Confidential Information. The term "Confidential Information" shall
mean any and all proprietary or confidential information of Scripps or Licensee
which may be exchanged between the parties at any time and from time to time
during the term of this Agreement. Information shall not be considered
confidential to the extent that it:

            (a) Is publicly disclosed through no fault of any party hereto,
      either before or after it becomes known to the receiving party; or

            (b) Was known to the receiving party prior to the date of this
      Agreement, which knowledge was acquired independently and not from another
      party hereto (or such party's employees); or

            (c) Is subsequently disclosed to the receiving party in good faith
      by a third party who has a right to make such disclosure; or

            (d) Has been published by a third party as a matter of right.

      1.3 Field. The term "Field" shall mean [*              ]

      1.4 Licensed Product. The term "Licensed Product" shall mean a product,
the manufacture, sale or use of which would but for the license granted herein,
infringe a Valid Claim in the country for which such product is sold. Without
limiting the foregoing, Licensed Product shall also include a product the
manufacture, sale or use of a particular product would but for the license
granted herein infringe a Valid Claim in the United States and at least two (2)
Major Countries, in such case irrespective of where such product is made, sold
or used and irrespective of whether such product is covered by a Valid Claim in
the country where sold.

      1.5 Major Countries. The term "Major Countries" shall mean France,
Germany, Italy and the United Kingdom.

      1.6 Net Sales. The term "Net Sales" shall mean the total amount invoiced
to third parties on sales of Licensed Products by Licensee, its Affiliates, or
Sublicensees, for which royalties are due under Article 3 below, less the
following reasonable and customary deductions to the extent applicable to such
invoiced amounts: (i) all trade, cash and quantity credits, discounts, refunds
or

*This confidential portion has been omitted and filed separately with the 
 Commission

<PAGE>

government rebates; (ii) amounts for claims, allowances or credits for returns,
retroactive price reductions, or chargebacks; (iii) packaging, handling fees and
prepaid freight, sales taxes, duties and other governmental charges (including
value added tax); and (iv) provisions for uncollectible accounts determined in
accordance with reasonable accounting practices, consistently applied to all
products of the selling party; provided, however, that in the case of
Patient-Specific Licensed Products, "Net Sales" shall equal [*] of the 
foregoing amounts (after the deductions described in (i) through (iv) above). 
For purposes of the foregoing, it is understood that Net Sales shall include 
only the amount invoiced for materials consisting of Licensed Products
(less the foregoing deductions and adjustments) and shall not include charges
related to services (other than cell separation and expansion) performed in
connection with the sale of such Licensed Products; accordingly, Net Sales shall
not include, without limitation, charges for apheresis, reinfusion, surgical
procedures, hospital stays or the like. For the removal of doubt, Net Sales
shall not include sales by Licensee to its Affiliates for resale, provided that
if Licensee sells a Licensed Product to an Affiliate for resale, Net Sales shall
include the amounts invoiced by such Affiliate to third parties on the resale of
such Licensed Product. In the event that Licensee grants a sublicense hereunder,
and receives payments based upon the Sublicensee's sales of Licensed Products,
Licensee may upon approval by Scripps, which approval shall not be unreasonably
withheld, substitute the definition of "Net Sales," used by the Sublicensee to
calculate payments to Licensee in place of the foregoing definition of "Net
Sales" for purposes of calculating royalties payable to Scripps on such
Sublicensee's sales.

      1.7 Patient-Specific Licensed Product. The term "Patient-Specific Licensed
Product shall mean a Licensed Product that includes either (i) autologous cells
from the patient; or (ii) nonautologous cells that otherwise are not intended
for use in all patients (such as Licensed Products that are fetal cells
expressing an HLA-type compatible with the particular patient but not optimally
compatible with patients who have a different HLA type).

      1.8 Scripps Patent Rights. The term "Scripps Patent Rights" shall mean all
rights resulting from:

            (a) all worldwide patent and patent applications claiming the
      Scripps Technology described in Exhibit A hereto (the "Existing Patents");
      and

            (b) all divisions, continuations, continuations-in-part, patents of
      addition, and substitutions of the Existing Patents, together with all
      registrations, reissues, reexaminations or extensions of any kind with
      respect to any of the foregoing patents to the extent the same claim
      Scripps Technology.

      From time to time during the term of this Agreement the parties agree to
record and update on Exhibit B all patents and patent applications within the
Scripps Patent Rights

      In the event that Scripps and Licensee are joint owners of an invention by
reason of the fact that personnel of both Scripps and Licensee are joint
inventors of such invention, it is understood that the Scripps Patent Rights
include only Scripps' rights as a joint owner of the patent applications and
patents that claim such joint invention.

*This confidential portion has been omitted and filed separately with the 
 Commission


<PAGE>

      1.9 Scripps Technology. The term "Scripps Technology" shall mean so much
of the technology as is proprietary to Scripps that was developed in performance
of the Research Program and in the disclosure provided to Licensee pursuant to
Section 3.2 or 3.3 of the Research Agreement, a copy of which is attached as
Exhibit A hereto and incorporated herein by reference, together with materials,
information and know-how related thereto from the Research Program as described
Exhibit A whether or not the same is eligible for protection under the patent
laws of the United States or elsewhere, and whether or not any such processes
and technology, or information related thereto, would be enforceable as a trade
secret or the copying of which would be enjoined or restrained by a court as
constituting unfair competition.

      1.10 Sublicensee. The term "Sublicensee" shall mean any non-Affiliate
third party to whom Licensee has granted the right to manufacture and sell
Licensed Products, with respect to Licensed Products made and sold by such third
party.

      1.11 Valid Claim. The term "Valid Claim" shall mean a claim of an issued
and unexpired patent or a claim of a pending patent application within the
Scripps Patent Rights which has not been held unpatentable, invalid or
unenforceable by a court or other government agency of competent jurisdiction
and has not been admitted to be invalid or unenforceable through reissue,
reexamination, disclaimer or otherwise; provided, however, that if the holding
of such court or agency is later reversed by a court or agency with overriding
authority, the claim shall be reinstated as a Valid Claim with respect to Net
Sales made after the date of such reversal. Notwithstanding the foregoing
provisions of this Section 1. 11, if a claim of a pending patent application
within the Scripps Patent Rights has not issued as a claim of an issued patent
within the Scripps Patent Rights, within five (5) years after the filing date
from which such claim takes priority, such pending claim shall not be a Valid
Claim for purposes of this Agreement.

2. License Terms and Conditions.

      2.1 Grant of License.

      (a) Scripps hereby grants to Licensee an exclusive, worldwide license,
including the right to sublicense, to: make, use, sell, import, export or
otherwise distribute Licensed Products; practice any method, process or
procedure, and otherwise exploit the Scripps Patent Rights; and to have any of
the foregoing performed on its behalf by a third party, in each case solely
within the Field, subject to the terms of this Agreement.

      (b) Scripps hereby grants to Licensee a non-exclusive, worldwide license,
including the right to sublicense to and under the Scripps Technology for the
purpose of exercising its rights and licenses under the Scripps Patent Rights.

<PAGE>

      2.2 Royalties. In consideration for the exclusive license granted pursuant
to Section 2.1 hereof, Licensee shall pay to Scripps a continuing royalty the
following percentages of Net Sales of each Licensed Product by Licensee, its
Affiliates and Sublicensees: (i) [*          ] of Net Sales in Patent
Countries and (ii) [*        ] in Non-Patent Countries. For purposes of
calculating royalties due hereunder, a "Patent Country" shall mean, with respect
to a particular Licensed Product, a country in which at the time of the sale of
such Licensed Product in such country, the manufacture, use or sale of such
Licensed Product would infringe a Valid Claim in such country; and a "Non-Patent
Country" shall mean, with respect to such Licensed Product, a country which a
the time of sale of such Licensed Product in such country is not a Patent
Country.

      2.3 Milestone Payments. As additional consideration for the exclusive
license granted pursuant to Section 2.1 hereof, Licensee agrees to pay to
Scripps upon the first occurrence of each milestone specified below for the
first Licensed Product to meet such milestone:

                    MILESTONES                                    PAYMENT
                    ----------                                    -------

1.    First initiation of Phase II Trials for the first           [*     ]
      Licensed Product.

2.    First initiation of Phase III Trials for the first          [*     ]
      Licensed Product.

3.    First receipt of government approval to market and          [*     ]
      distribute the first Licensed Product in the United 
      States or the first Major Country.

For purposes of the foregoing milestones, "Phase II Trials" shall mean that
portion of the clinical studies for the FDA submission and approval process
which provides for the initial trials of a Licensed Product for the purposes of
determining the efficacious therapeutic dose range and evaluating safety in the
proposed therapeutic indication as more fully defined in 21 C.F.R. ss.
312.21(b), or a similar clinical study in a country other than the United
States; and "Phase III Trials" shall mean that portion of the clinical studies
for the FDA submission and approval process which provides for trials of a
Licensed Product on sufficient numbers of patients to establish the safety and
efficacy of such Licensed Product to support regulatory approval in the proposed
application as more fully defined in 21 C.F.R. ss. 3122.21(c), or similar
clinical study in a country other than the United States.

      2.4 Combination Products.

            2.4.1 Definition of Combination Product. As used herein, the term
"Combination Product" shall mean a Licensed Product which cannot be
manufactured, used or sold without infringing Scripps Patent Rights licensed
hereunder in the country where sold which 

*This confidential portion has been omitted and filed separately with the 
 Commission


<PAGE>

is sold with another product, component or service for which no royalty would be
due hereunder if sold separately.

            2.4.2 Royalty Payable on Combination Products. The royalty payable
on Combination Products shall be the royalty rate set forth in Section 2.2 above
based on a pro rata portion of Net Sales of Combination Products in accordance
with the following formula:

                                  A
                               X= -
                                  A + B, where

                        X = the pro rata portion of Net Sales attributable to
                        Scripps Patent Rights or other Scripps Technology
                        licensed herein (expressed as a percentage), and

                        A = the fair market value of the Licensed Product
                        component, and

                        B = the fair market value of all other components
                        (product, component or service) in the Combination
                        Product.

The fair market values described above shall be determined by the parties hereto
in good faith. Notwithstanding the foregoing, in the event that there is no
separate fair market values of the Licensed Product and such other product(s),
component(s) and/or services(s), then the Net Sales shall be as reasonably
allocated by Licensee between such Licensed Product and such other product(s),
component(s) and/or service(s), based upon their relative importance and
proprietary position, subject to the consent of Scripps, which consent shall not
be unreasonably withheld.

      2. 5 Multiple Royalties. If Licensee, its Affiliate or Sublicensee is
required to pay a non-Affiliate third party amounts with respect to a Licensed
Product under agreements for patent rights or other technologies which Licensee,
its Affiliate or Sublicensee, in its reasonable judgment, determines are
necessary or desirable to license or acquire with respect to such Licensed
Product, Licensee may deduct such amount owing to such non-Affiliate third
parties (prior to any reductions) from the royalty owing to Scripps for the sale
of such Licensed Product pursuant to Section 2.2 above. Notwithstanding the
foregoing provisions of this Section 2.5, in no event shall the royalties due to
Scripps pursuant to Section 2.2 above be so reduced to less than fifty percent
(50%) of the amount that would otherwise be due Scripps thereunder.

      2.6 Quarterly Payments.

            2.6.1 Sales by Licensee. With regard to Net Sales made by Licensee
or its Affiliates, royalties shall be payable by Licensee quarterly, within
sixty (60) days after the end of each calendar quarter, based upon the Net Sales
of Licensed Products during such preceding calendar quarter, commencing with the
calendar quarter in which the first commercial sale of any Licensed Product is
made.

            2.6.2 Sales by Sublicensees. With regard to Net Sales made by
Sublicensees of Licensee or its Affiliates, royalties shall be payable by
Licensee quarterly, within ninety (90) days after the end of each calendar
quarter, based upon the Net Sales of Licensed Products by 

<PAGE>

such Sublicensee during such preceding calendar quarter, commencing with the
calendar quarter in which the first commercial sale of any Licensed Product is
made by such Sublicensee.

      2. 7 Term of License. Unless terminated sooner in accordance with the
provisions of this Agreement, the term of this license shall expire when the
last of the royalty obligations set forth has expired (i.e., until expiration,
revocation or invalidation of the last patent or the abandonment of the last
application within the Scripps Patent Rights, whichever is later).
Notwithstanding the foregoing, if applicable government regulations require a
shorter term and/or a shorter term of exclusivity than provided for herein, then
the term of this License Agreement shall be so shortened or this License
Agreement shall be amended to provide for a non-exclusive license, and, in such
event, the parties shall negotiate in good faith to reduce appropriately the
royalties payable as set forth under the section heading "Royalties" hereof.
Notwithstanding anything herein to the contrary, Licensee's license under
Section 2. l(b) with respect to the Scripps Technology shall survive the
expiration, (but not an earlier termination, except as provided in Section 8.6
below) of this Agreement.

      2.8 Sublicense. Licensee shall have the sole and exclusive right to grant
sublicenses to any party with respect to the rights conferred upon Licensee
under this Agreement, provided, however, that any such sublicense shall be
subject in all respects to the restrictions, exceptions, royalty obligations,
reports, termination provisions, and other provisions contained in this
Agreement. Wtthout limiting the foregoing, Licensee agrees to provide Scripps a
copy of each such sublicense agreement within thirty (30) days of the execution
thereof. Licensee shall pay Scripps, or cause its Affiliate or Sublicensee to
pay Scripps, the same royalties on all Net Sales of such Affiliate or
Sublicensee the same as if said Net Sales had been made by Licensee. Each
Affiliate and Sublicensee shall report its Net Sales to Scripps through
Licensee, which Net Sales shall be aggregated with any Net Sales of Licensee for
purposes of determining the Net Sales upon which royalties are to be paid to
Scripps.

      2.9 Reports. Licensee shall furnish to Scripps at the same time as each
royalty payment is made by Licensee, a detailed written report of Net Sales of
the Licensed Products and the royalty due and payable thereon, including a
description of any offsets or credits deducted therefrom, on a
product-by-product and country-by-country basis, for the calendar quarter upon
which the royalty payment is based.

      2.10 Records. Licensee shall keep, and cause its Affiliates and
Sublicensees to keep, full, complete and proper records and accounts of all
sales of Licensed Products in sufficient detail to enable the royalties payable
on Net Sales of each Licensed Product to be determined. Scripps shall have the
right to appoint an independent certified public accounting firm approved by
Licensee, which approval shall not be unreasonably withheld, to audit the
records of Licensee, its Affiliates and Sublicensees as necessary to verify the
royalties payable pursuant to this Agreement. Licensee, its Affilliates and
Sublicensees shall pay to Scripps an amount equal to any additional royalties to
which Scripps is entitled as disclosed by the audit, plus interest thereon at
the rate of one and one-half percent (1.5%) per month. Such audit shall be at
Scripps' expense; provided, however, that if the audit discloses that Scripps
was underpaid royalties with respect to the period covered by the audit by at
least five percent (5%), then Licensee, its Affiliates or Sublicensee, as the
case may be, shall reimburse Scripps for all reasonable out-of-pocket audit
costs. Scripps may exercise its right of audit as to each of Licensee, its
Affiliates or Sublicensees no more frequently than once in any calendar year.
The accounting firm shall 

<PAGE>

disclose to Scripps only information relating to the accuracy of the royalty
payments. Licensee, its Affiliates and Sublicensees shall preserve and maintain
all such records required for audit for a period of three (3) years after the
calendar quarter to which the record applies.

      2.11 Foreign Sales. The remittance of royalties payable on sales outside
the United States shall be payable to Scripps in United States Dollar
equivalents at the official rate of exchange of the currency of the country from
which the royalties are payable, as quoted in the Wall Street Journal for the
last business day of the calendar quarter in which the royalties are payable. If
the transfer of or the conversion into the United States Dollar equivalents of
any such remittance in any such instance is not lawful or possible, the payment
of such part of the royalties as is necessary shall be made by the deposit
thereof, in the currency of the county where the sale was made on which the
royalty was based to the credit and account of Scripps or its nominee in any
commercial bank or trust company of Scripps' choice located in that country,
prompt written notice of which shall be given by Licensee to Scripps and except
as set forth in Section 2.10 above, Licensee shall have no further obligation
with respect to such royalties.

      2.12 Foreign Taxes. Any tax required to be withheld by Licensee under the
laws of any foreign country for the accounts of Scripps shall be promptly paid
by Licensee for and on behalf of Scripps to the appropriate governmental
authority, and Licensee shall use its best efforts to furnish Scripps with proof
of payment of such tax together with official or other appropriate evidence
issued by the applicable government authority. Any such tax actually paid on
Scripps' behalf shall be deducted from royalty payments due Scripps hereunder.

      2.13 Single Payments. The parties hereto acknowledge that the parties 
may enter into multiple license agreements with respect to technologies 
arising out of the Research Agreement, including this Agreement 
(collectively, the "Scripps License Agreements") pursuant to which Licensee 
will owe royalties and milestone payments. Notwithstanding anything herein to 
the contrary, with respect to any unit of Licensed Product only a single 
royalty shall be due to Scripps at the highest applicable rate for such unit 
regardless if such Licensed Product is covered by more than one Valid Claim 
or would be a Licensed Product under more than one Scripps License Agreement. 
(For example, if a product sold by Licensee is a Licensed Product under this 
Agreement for which Licensee owes Scripps a royalty of [*] of Net Sales and 
Licensee would otherwise owe Scripps a royalty of [*] of Net Sales of such 
product under another Scripps License Agreement, Licensee's royalty 
obligation to Scripps shall be fulfilled by paying Scripps [*] of Net Sales 
with respect to sales of such License Product.) Likewise, with respect to the 
milestone payments under Section 2.3 above, once such milestone payment has 
been paid for a Licensed Product under any Scripps License Agreement then 
Licensee's obligation to pay such milestone shall be deemed to be fulfilled 
with respect to all Scripps License Agreement, regardless of whether the 
product for which such a milestone payment was paid was a "Licensed Product" 
for purposes of a particular Scripps License Agreement or not. (For example, 
if a Licensee initiates Phase II Trials for a product, which product falls 
within the definition of "Licensed Product" under this Agreement and pays 
Scripps the corresponding [*   ] payment, Licensee shall have no further 
obligation to pay any amounts to Scripps with respect to any other product 
under any Scripps License Agreement upon the initiation of Phase II Trials 
for a Licensed Product whether or not the product for which Licensee 
initially paid such milestone payment is a Licensed Product for purposes of 
any other Scripps License Agreement.)

3. Patent Matters.

*This confidential portion has been omitted and filed separately with the 
 Commission


<PAGE>

      3.1 Patent Prosecution and Maintenance. From and after the date of this
Agreement, the provisions of this Section 3 shall control the prosecution and
maintenance of any patent or patent application included within Scripps Patent
Rights. Subject to the requirements, limitations and conditions set forth in
this Agreement, Scripps shall direct and control (i) the preparation, filing and
prosecution of the United States and foreign patent applications within Scripps
Patent Rights (including any interferences and foreign oppositions) and (ii)
maintain the patents issuing therefrom. Scripps shall select the patent
attorney, subject to Licensee's written approval, which approval shall not be
unreasonably withheld. Both parties hereto agree that Scripps may, at its sole
discretion, utilize Scripps' Office of Patent Counsel in lieu of outside counsel
for patent prosecution and maintenance described herein, and the fees and
expenses incurred by Scripps with respect to work done by such Office of Patent
Counsel shall be paid as set forth below. Licensee shall have full rights of
consultation with the patent attorney so selected on all matters relating to
Scripps Patent Rights. Scripps shall use its best efforts to implement all
reasonable requests made by Licensee with regard to the preparation, filing,
prosecution and/or maintenance of the patent applications and/or patents within
Scripps Patent Rights.

      3.2 Information to Licensee. Scripps agrees to use reasonable efforts to
(i) keep Licensee informed as to the filing, prosecution and maintenance of
patents and patent applications within the Scripps Patent Rights, (ii) furnish
to Licensee copies of documents relevant to any such filing, prosecution and
maintenance and (iii) allow Licensee reasonable opportunity to comment on
documents filed with any patent office which would affect the Scripps Patent
Rights or Licensee' rights hereunder.

      3.3 Patent Costs. Licensee acknowledges and agrees that Scripps does not
have independent funding to cover patent costs, and that the license granted
hereunder is in part in consideration for Licensee's assumption of patent costs
and expenses as described herein. Licensee shall pay for all expenses incurred
by Scripps pursuant to Section 3.1 hereof. In addition, Licensee connection with
Scripps Patent Rights licensed hereunder. Licensee agrees to pay all such past
and future patent expenses directly or to reimburse Scripps for the payment of
such expenses within sixty (60) days after Licensee receives an itemized invoice
therefor. In the event Licensee elects to discontinue payment for the filing,
prosecution and/or maintenance of any patent application and/or patent within
Scripps Patent Rights, any such patent application or patent shall be excluded
from the definition of Scripps Patent Rights and from the scope of the license
granted under this Agreement, and all rights relating thereto shall revert to
Scripps and may be freely licensed by Scripps. Licensee shall give Scripps at
least sixty (60) days' prior written notice of such election. No such notice
shall have any effect on Licensee's obligations to pay expenses incurred up to
the effective date of such election.

      3.4 Ownership. Subject to any joint or mutual ownership of Licensee by
virtue of joint inventorship of inventions covered therein, the patent
applications filed and patent applications obtained by Scripps pursuant to
Section 3.1 hereof shall be owned solely by Scripps, assigned to Scripps and
deemed a part of Scripps Patent Rights.

      3.5 Scripps Right to Pursue Patent. If at any time during the term of this
Agreement, Licensee's rights with respect to Scripps Patent Rights are
terminated, Scripps shall have the right to take whatever action Scripps deems
appropriate to obtain or maintain the corresponding patent protection at its own
expense. If Scripps pursues patents under this Section 3.5, Licensee 

<PAGE>

agrees to cooperate fully, including by providing, at no charge to Scripps, all
appropriate technical data and executing all necessary legal documents.

      3.6 Prosecution by Licensee. If Scripps elects not to file, prosecute or
maintain any patent application or patent within the Scripps Patent Rights or
pay any fee related thereto, in any country Scripps shall promptly notify
Licensee of such election, but in no case later than sixty (60) prior to any
required action relating to the filing, prosecution or maintenance of such
patent application or patent. In such event, if Licensee elects to take over the
filing, prosecution and/or maintenance of one or more patents or patent
applications within the Scripps Patent Rights, Licensee shall have the right, at
its option, to control the filing, prosecution and/or maintenance of any such
patent applications or patents within the Scripps Patent Rights at its own
expense. In which case Licensee shall keep Scripps reasonably informed on
matters regarding such filing, prosecution and maintenance.

      3 .7  Infringement.

      3 .7.1 Enforcement. If either party determines that a third party is
making, using or selling a product that may infringe the Scripps Patent Rights,
that party shall notify the other party in writing.

            (a) Licensee shall have the first right (itself or through others),
at its sole option, to bring suit to enforce the Scripps Patent Rights, and/or
to defend any declaratory judgment action with respect thereto, in each case
with respect to the manufacture, sale or use of a product within the Field;
provided, however, that Licensee shall keep Scripps reasonably informed as to
the defense and/or settlement of such action. Scripps shall have the right to
participate in any such action with counsel of its own choice at its own
expense.

            (b) In the event Licensee elects not to initiate an action to
enforce the Scripps Patent Rights against a commercially significant
infringement by a third party within the Field, within one (1) year of a request
by Scripps to do so, (or within such shorter period which may be required to
preserve the legal rights of Scripps under the laws of the relevant government),
Scripps may initiate such action at its expense with Licensee' prior written
consent, which consent shall not be unreasonably withheld. Licensee shall have
the right to participate in any such action with counsel of its own choice at
its own expense.

            (c) All recoveries received by a party from an action to enforce the
Scripps Patent Rights shall be first applied to reimburse the controlling
party's and then the non-controlling party's unreimbursed expenses, including
without limitation, reasonable attorney's fees and court costs. Any remainder
shall, to the extent the same pertains to an infringement of the Scripps Patent
Rights, be divided [*                ] to Licensee and [*                ] to
Scripps.

            3.7.2 Defense. If Licensee, its Affiliate, Sublicensee, distributor
or other customer is sued by a third party charging infringement of patent
rights that dominate a claim of the Scripps Patent Rights or that cover other
Related Material with respect to the manufacture, use, distribution or sale of a
Licensed Product, Licensee will promptly notify Scripps. As between the parties
to this Agreement, Licensee will be entitled to control the defense in any such
action(s) and withhold [*          ] of the royalties related to such Licensed
Product 

*This confidential portion has been omitted and filed separately with the 
 Commission


<PAGE>

otherwise payable to Scripps and use the withheld royalties to reimburse the
legal defense costs, attorneys' fees and liability incurred in such infringement
suit(s). Notwithstanding the foregoing, Licensee agrees to withhold only that
portion of such royalties as may reasonably be necessary to reimburse amounts in
accordance with this Section 3 .7.2. If Licensee is required to pay a royalty to
a third party to make and/or sell a Licensed Product as a result of a final
judgment or settlement, such amounts may be deducted from the running royalties
payable to Scripps hereunder in relation to such Licensed Product; provided that
such royalties shall not be so reduced by more than [*               ]. Subject
to the provisions of Section 4.3 below, Licensee agrees to indemnify and hold
Scripps harmless from any costs, expenses or liability arising out of all such
infringements or charges of infringement.

            3.7.3 Cooperation. In any suit, action or other proceeding in
connection with enforcement and/or defense of the Scripps Patent Rights, each
party hereto agrees to cooperate fully, including without limitation by joining
as a party plaintiff and executing such documents as the other party may
reasonably request. Without limiting the foregoing, upon the request of and, at
the expense of a party controlling any suit, action or other proceeding pursuant
to this Article 3, the other party shall make available at reasonable times and
under appropriate conditions all relevant personnel, records, papers,
information, samples, specimens and other similar materials in such other
party's possession.

            3.7.4 No Implied Obligations. Except as expressly provided in this
Section 3.7, neither party has any obligation to bring or prosecute actions or
suits against any third party for patent infringement.

4. Obligations Related to Commercialization.

      4.1 Commercial Development Obligation. In order to maintain the license
granted hereunder in force, Licensee shall use reasonable efforts and due
diligence to develop Scripps Technology and Scripps Patent Rights which are
licensed hereunder into commercially viable Licensed Products, as promptly as is
reasonably and commercially feasible, and thereafter to produce and sell
reasonable quantities of Licensed Products. Licensee shall keep Scripps
generally informed as to Licensee's progress in such development, production and
sale, including its efforts, if any, to sublicense Scripps Technology and
Scripps Patent Rights, and Licensee shall deliver to Scripps an annual written
report and such other reports as Scripps may reasonably request. The parties
hereto acknowledge and agree that achievement of mutually agreeable milestones
shall be evidence of compliance by Licensee with its commercial development
obligations hereunder. Notwithstanding the foregoing, if Licensee believes that
it cannot, within the exercise of prudent and reasonable business judgment,
perform any mutually agreed upon milestones within the time period required
therefor, Licensee may request an extension of time for the performance date to
a date that Licensee believes to be reasonable and prudent and Scripps shall
agree to any requested extension which is not more than one (l) year in length
from the originally required date and will not unreasonably withhold consent to
requests for longer extensions. In the event Scripps has a reasonable basis to
believe that Licensee is not using reasonable efforts and due diligence as
required hereunder, upon notice by Scripps to Licensee which specifies the basis
for such belief, Scripps and Licensee shall negotiate in good faith to attempt
to mutually resolve the issue. In the event Scripps and Licensee cannot agree
upon any matter related to Licensee's commercial development obligations, the
parties agree to utilize arbitration pursuant to Section 10.2 hereof in order to
resolve the matter. If the arbitrator

*This confidential portion has been omitted and filed separately with the 
 Commission


<PAGE>

determines that Licensee has not complied with its obligations hereunder, and
such default is not cured within sixty (60) days after the arbitrator's
decision, Scripps may terminate Licensee's rights under this Agreement.

      4.2 Governmental Approvals and Marketing of Licensed Products. Licensee
shall be responsible for obtaining all necessary governmental approvals for the
development, production, distribution, sale and use of any Licensed Product, at
Licensee's expense, including, without limitation, any safety studies. Licensee
shall have sole responsibility for any warning labels, packaging and
instructions as to the use of Licensed Products and for the quality control for
any Licensed Product.

      4.3 Indemnity. Licensee hereby agrees to indemnify, defend and hold
harmless Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents from and against any
liability or expense arising from any product liability claim asserted by any
party as to any Licensed Product or any claims arising from the use of any
Scripps Patent Rights or Scripps Technology pursuant to this Agreement. Such
indemnity and defense obligation shall apply to any product liability or other
claims, including without limitation, personal injury, death or property damage,
made by employees, subcontractors, sublicensees, or agents of Licensee, as well
as any member of the general public. Notwithstanding the foregoing, Licensee's
obligation to provide indemnification under this Section 4 3 shall be subject to
each party seeking indemnification hereunder (i) promptly notify Licensee in
writing of any claim, suit or proceeding with respect to which the party intends
to claim such indemnification, (ii) give Licensee sole control of the defense
and/or settlement thereof, and (iii) provide Licensee, at Licensee's expense,
with reasonable assistance and full information with respect to such claim, suit
or proceeding. Licensee shall not settle any claim, suit or proceeding subject
to this Section 4.3 or otherwise consent to an adverse judgment in such claim,
suit or proceeding if the same materially diminishes the rights or interests of
the indemnified party without the express written consent of such party.
Licensee shall have no obligation for any claim, suit or proceeding if the party
seeking indemnification makes any settlement regarding such claim, suit or
proceeding without the prior written consent of Licensee, which consent shall
not be unreasonably withheld. Licensee shall use its best efforts to have
Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents named as additional insured
parties on any product liability insurance policies maintained by Licensee, its
Affiliates and sublicensees applicable to Licensed Products.

      4.4 Patent Marking. To the extent required by applicable law, Licensee
shall mark all Licensed Products or their containers in accordance with the
applicable patent marking laws.

      4 5 No Use of Name. Except as required by law, the use of the name "The
Scripps Research Institute", " Scripps", or any variation thereof in connection
with the advertising or sale of Licensed Products is expressly prohibited.

      4.6 U.S. Manufacture. To the extent required by applicable United States
laws, if at all, Licensee agrees that Licensed Products will be manufactured in
the United States, or its territories, subject to such waivers as may be
required, or obtained, if at all, from the United States Department of Health
and Human Services, or its designee.

<PAGE>

      4 7 Foreign Registration. Licensee agrees to register this Agreement with
any foreign governmental agency which requires such registration, and Licensee
shall pay all costs and legal fees in connection therewith. In addition,
Licensee shall assure that all foreign laws affecting this Agreement or the sale
of Licensed Products are fully satisfied.

5 . Limited Warranty. Scripps hereby represents and warrants that subject to the
rights of the United States Government (i) it has sole right and power to enter
into this Agreement and grant the rights and licenses granted herein; (ii)
Scripps is and shall be the owner of the entire right, title, and interest in
and to the Scripps Patent Rights; (iii) Scripps has not previously granted and
will not grant any rights in the Scripps Patent Rights that are inconsistent
with the rights and licenses granted to Licensee herein; and (iv) to the best of
its knowledge, there are no claims of third parties that would call into
question the rights of Scripps to grant to Licensee the rights contemplated
hereunder. EXCEPT AS PROVIDED IN THIS SECTION 5, NEITHER PARTY MAKES ANY
WARRANTIES OR CONDITIONS (EXPRESS, IMPLIED, STATUTORY OR OTHERWISE) WITH RESPECT
TO THE SUBJECT MATTER HEREOF. SPECIFICALLY, SCRIPPS MAKES NO OTHER WARRANTIES
CONCERNING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT, INCLUDING WITHOUT LIMITATION, ANY EXPRESS OR IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AS TO SCRIPPS PATENT RIGHTS,
SCRIPPS TECHNOLOGY OR ANY LICENSED PRODUCT. SCRIPPS MAKES NO WARRANTY OR
REPRESENTATION AS TO THE VALIDITY OR SCOPE OF SCRIPPS PATENT RIGHTS, OR THAT ANY
LICENSED PRODUCT WILL BE FREE FROM AN INFRINGEMENT ON PATENTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES, OR THAT NO THIRD PARTIES ARE IN
ANY WAY INFRINGING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT.

6. Interests in Intellectual Property Rights.

      6.1 Preservation of Title. Scripps shall retain full ownership and title
to Scripps Technology, and Scripps Patent Rights licensed hereunder and shall
use its reasonable best efforts to preserve and maintain such full ownership and
title, subject to Licensee fully performing all of its obligations under this
Agreement.

      6 2 Rovalty-free License to Improvements. Licensee hereby grants to
Scripps a non-exclusive, royalty-free license to any improvement to Scripps
Technology developed by Licensee during the term of this Agreement, to use for
Scripps own non-cornmercial research purposes or grant to other nonprofit
institutions for their non-commercial research purposes.

      6.3 Governmental Interest. Licensee and Scripps acknowledge that Scripps
has received, and expects to continue to receive, funding from the United States
Government in support of Scripps' research activities. Licensee and Scripps
acknowledge and agree that their respective rights and obligations pursuant to
this Agreement shall be subject to Scripps' obligations and the rights of the
United States Government, if any, which arise or result from Scripps' receipt of
research support from the United States Government, including without
limitation, the grant by Scripps to the United States a non-exclusive,
irrevocable, royalty-free license to Scripps Technology and Scripps Patent
Rights licensed hereunder for governmental purposes.

<PAGE>

      6.4 Reservation of Rights. Scripps reserves the right to use for any
non-commercial research purposes and the right to allow other nonprofit
institutions to use for any non-commercial research purposes any Scripps
Technology and Scripps Patent Rights licensed hereunder, without Scripps or such
other institutions being obligated to pay Licensee any royalties or other
compensation.

7. Confidentiality and Publication.

      7.1 Treatment of Confidential Information. The parties agree that during
the term of this Agreement and for ten ( 10) years thereafter, a party receiving
Confidential Information of the other party will (i) maintain in confidence such
Confidential Information to the same extent such party maintains its own
proprietary industrial information, (ii) not disclose such Confidential
Information to any third party without prior written consent of the other party
and (iii) not use such Confidential Information for any purpose except those
permitted by this Agreement.

      7.2 Permitted Usage. Notwithstanding the provisions of Section 7.1 above,
the receiving party may use or disclose Confidential Information of the
disclosing party to the extent necessary to exercise its rights hereunder
(including commercialization and/or sublicensing of Scripps Patent Rights and
Scripps Technology) or fulfill its obligations and/or duties hereunder and in
filing for, prosecuting or maintaining any proprietary rights, prosecuting or
defending litigation, complying with applicable governmental regulations and/or
submitting information to tax or other governmental authorities; provided that
if the receiving party is required by law to make any public disclosures of
Confidential Information of the disclosing party, to the extent it may legally
do so, it will give reasonable advance notice to the disclosing party of such
disclosure and will use its reasonable efforts to secure confidential treatment
of Confidential Information prior to its disclosure (whether through protective
crders or otherwise).

      7.3 Publications. Licensee agrees that Scripps shall have a right to
publish in accordance with its general policies and subject to Section 6.2 of
the Research Agreement.

      7.4 Publicity. Except as otherwise provided herein or required by law, no
party shall originate any publication, news release or other public
announcement, written or oral, whether in the public press, stockholders'
reports, or otherwise, relating to this Agreement or to any sublicense
hereunder, or to the performance hereunder or any such agreements, without the
prior written approval of the other party, which approval shall not be
unreasonably withheld. Scientific publications published in accordance with
Section 7.3 of this Agreement shall not be construed as publicity governed by
this Section 7.4.

8. Term and Termination.

      8.1 Term. Unless terminated sooner in accordance with the terms set forth
herein, this Agreement, and the license granted hereunder, shall terminate as
provided in Section 2.7 hereof.

      8.2 Termination Upon Default. Any one or more of the following events
shall constitute an event of default hereunder: (i) the failure of a party to
pay any amounts when due 

<PAGE>

hereunder and the expiration of thirty (30) days after receipt of a written
notice requesting the payment of such amount; (ii) the failure of a party to
perform any material obligation required of its to be performed hereunder, and
the failure to cure within sixty (60) days after receipt of notice from the
other party specifying in reasonable detail the nature of such default. Upon the
occurrence of any event of default, the non-defaulting party may deliver to the
defaulting party written notice of intent to terminate, such termination to be
effective upon the date set forth in such notice.

      Such termination rights shall be in addition to and not in substitution
for any other remedies that may be available to the non-defaulting party.
Termination pursuant to this Section 8.2 shall not relieve the defaulting party
from liability and damages to the other party for breach of this Agreement.
Waiver by either party of a single default or a succession of defaults shall not
deprive such party of any right to terminate this Agreement arising by reason of
any subsequent default.

      Notwithstanding the foregoing provisions of this Section 8.2, if the party
alleged to be in default of this Agreement disputes in good faith such default
within the applicable cure period, the other party's right to terminate shall be
stayed until it has been determined in accordance with Section 10 2 below of
this Agreement that the party alleged to be in default was actually in default
and such defaulting party fails to comply with its obligations hereunder within
the applicable cure period.

      8 3 Termination Upon Bankruptcy or Insolvency. This Agreement may be
terminated by Scripps giving written notice of termination to Licensee upon the
filing of bankruptcy or bankruptcy of Licensee or the appointment of a receiver
of any of Licensee's assets, or the making by Licensee of any assignment for the
benefit of creditors, or the institution of any proceedings against Licensee
under any bankruptcy law which proceeding is not dismissed with prejudice within
ninety (90) days from its initiation. Termination shall be effective upon the
date specified in such notice.

      8.4 Termination by Licensee. Any provision herein notwithstanding,
Licensee may terminate this Agreement, in its entirety or as to any particular
patent or patent application within the Scripps Patent Rights, or as to any
particular Licensed Product, at any time by giving Scripps at least ninety (90)
days prior written notice. From and after the effective date of a termination
under this Section 8 4 with respect to a particular patent or application, such
patent(s) and patent application(s) in the particular country shall cease to be
within the Scripps Patent Rights for all purposes of this Agreement, and all
rights and obligations of Licensee with respect to such patent(s) and patent
application(s) shall terminate. From and after the effective date of a
termination under this Section 8.3 with respect to a particular Licensed
Product, the license granted under Section 2.1 above shall terminate with
respect to such Licensed Product, and the same shall cease to be a Licensed
Product for all purposes of this Agreement. Upon a termination of this Agreement
in its entirety under this Section 8.4, all rights and obligations of the
parties shall terminate, except as provided in Section 8.5 below.

      8.5 Rights Upon Expiration. Neither party shall have any further rights or
obligations upon the expiration of this Agreement upon its regularly scheduled
expiration date with respect to this Agreement, other than the obligation of
Licensee to make any and all reports and payments for the final quarter period.
Provided, however, that upon such expiration, each

<PAGE>

party shall be required to continue to abide by its non-use and non-disclosure
obligations as described in Section 7.1, and Licensee shall continue to maintain
records under Section 2.10 and abide by its obligation to indemnify Scripps as
described in Section 4.3 and by its obligations under Section 6.2 hereof.

      8.6   Rights Upon Termination.

            8.6.1 Accrued Obligations. Termination of this Agreement for any
reason shall not release either party hereto from any liability which at the
time of such termination has already accrued to the other party.

            8.6.2 Inventory. In the event this Agreement is terminated for any
reason, Licensee shall provide Scripps with a written inventory of all Licensed
Products that Licensee and its Affiliates have in process of manufacture, in use
or in stock and Licensee and its Affiliates shall have the right to sell or
otherwise dispose of such Licensed Products for a period not to exceed six (6)
months from the effective date of such termination, all subject to the payment
to Scripps royalties and provision of reports pursuant to this Agreement.

            8.6.3 Sublicenses. Upon termination of this Agreement by Scripps for
any reason, any sublicense granted by Licensee hereunder shall survive, provided
that upon request by Scripps, such Sublicensee promptly agrees in writing to be
bound by the applicable terms of this Agreement.

            8.6.4 Survival. Sections 2.10,4.3,6.2,7.1 and 10 shall survive any
termination of this Agreement. Except as otherwise provided in this Section 8,
all rights and obligations of the parties under this Agreement shall terminate
upon termination of this Agreement.

9. Assignment: Successors.

      9.1 Assignment. Neither this Agreement nor any rights granted hereunder
may be assigned or transferred by Licensee except (i) to an Affiliate of
Licensee or (ii) to a successor in interest to all or substantially all of the
business assets of Licensee, whether by way of a merger, consolidation, sale of
all or substantially all of Licensee's assets, change of control or similar
transaction, without the prior written consent of Scripps.

      9.2 Binding Upon Successors and Assigns. Subject to the limitations on
assignment herein, this Agreement shall be binding upon and inure to the benefit
of any successors in interest and assigns of Scripps and Licensee. Any such
successor or assignee of Licensee's interest shall expressly assume in writing
the performance of all the terms and conditions of this Agreement to be
performed by Licensee.

10. General Provisions.

      10.1 Independent Contractors. The relationship between Scripps and
Licensee is that of independent contractors. Scripps and Licensee are not joint
venturers, partners, principal and agent, master and servant, employer or
employee, and have no other relationship other than independent contracting
parties. Scripps and Licensee shall have no power to bind or obligate each other
in any manner, other than as is expressly set forth in this Agreement.

<PAGE>

      10 2 Arbitration. Any controversy or claim arising out of or relating to
this Agreement, or the breach thereof, shall be settled by binding arbitration
in accordance with the Commercial Arbitration Rules of the American Arbitration
Association ("AAA"), and the procedures set forth below. In the event of any
inconsistency between the Rules of AAA and the procedures set forth below, the
procedures set forth below shall control. Judgment upon the award rendered by
the arbitrators may be enforced in any court having jurisdiction thereof.

      10.2.1 Location. The location of the arbitration shall be in the County of
San Diego in the State of California.

      10.2.2 Selection of Arbitrators. The arbitration shall be conducted by a
panel of three neutral arbitrators who are independent and disinterested with
respect to the parties, this Agreement, and the outcome of the arbitration. Each
party shall appoint one neutral arbitrator, and these two arbitrators so
selected by the parties shall then select the third arbitrator. If one party has
given written notice to the other party as to the identity of the arbitrator
appointed by the party, and the party thereafter makes a written demand on the
other party to appoint its designated arbitrator within the next ten days, and
the other party fails to appoint its designated arbitrator within ten days after
receiving said written demand, then the arbitrator who has already been
designated shall appoint the other two arbitrators.

      10.2.3 Discovery. Unless the parties mutually agree in writing to some
additional and specific pre-hearing discovery, the only pre-hearing discovery
shall be (a) reasonably limited production of relevant and non-privileged
documents, and (b) the identification of witnesses to be called at the hearing,
which identification shall give the witness's name, general qualifications and
position, and a brief statement as to the general scope of the testimony to be
given by the witness. The arbitrators shall decide any disputes and shall
control the process concerning these pre-hearing discovery matters. Pursuant to
the Rules of AAA, the parties may subpoena witnesses and documents for
presentation at the hearing.

      10.2.4 Case Management. Prompt resolution of any dispute is important to
both parties; and the parties agree that the arbitration of any dispute shall be
conducted expeditiously. The arbitrators are instructed and directed to assume
case management initiative and control over the arbitration process (including
scheduling of events, pre-hearing discovery and activities, and the conduct of
the hearing), in order to complete the arbitration as expeditiously as is
reasonably practical for obtaining a just resolution of the dispute.

      10 2 5 Remedies. The arbitrators may grant any legal or equitable remedy
or relief that the arbitrators deem just and equitable, to the same extent that
remedies or relief could be granted by a state or federal court, provided
however, that no punitive damages may be awarded. No court action may be
maintained seeking punitive damages. The decision of any two of the three
arbitrators appointed shall be binding upon the parties.

      10.2.6 Expenses. The expenses of the arbitration, including the
arbitrators' fees, expert witness fees, and attorney's fees, may be awarded to
the prevailing party, in the discretion of the arbitrators, or may be
apportioned between the parties in any manner deemed appropriate by the
arbitrators. Unless and until the arbitrators decide that one party is to pay
for all (or a share) of

<PAGE>

such expenses, both parties shall share equally in the payment of the
arbitrators' fees as and when billed by the arbitrators.

      10.2.7 Confidentiality. Except as set forth below, the parties shall keep
confidential the fact of the arbitration, the dispute being arbitrated, and the
decision of the arbitrators. Notwithstanding the foregoing, the parties may
disclose information about the arbitration to persons who have a need to know,
such as directors, trustees, management employees, witnesses, experts,
investors, attorneys, lenders, insurers, and others who may be directly
affected. Additionally, if a party has stock which is publicly traded, the party
may make such disclosures as are required by applicable securities laws.
Further, if a party is expressly asked by a third party about the dispute or the
arbitration, the party may disclose and acknowledge in general and limited terms
that there is a dispute with the other party which is being (or has been)
arbitrated. Once the arbitration award has become final, if the arbitration
award is not promptly satisfied, then these confidentiality provisions shall no
longer be applicable.

      10.3 Entire Agreement Modification. This Agreement sets forth the entire
agreement and understanding between the parties as to the subject matter hereof.
There shall be no amendments or modifications to this Agreement, except by a
written document which is signed by both parties. It is understood that the
Research Agreement is separate and independent from this Agreement and
termination of either agreement shall not operate to terminate or otherwise
effect the rights and obligations of the parties under the other agreement.

      10.4 California Law. This Agreement shall be construed and enforced in
accordance with the laws of the State of California.

      10. 5 Limitation of Liability. NEITHER PARTY SHALL BE LIABLE TO THE OTHER
PARTY OR ANY THIRD PARTY FOR ANY SPECIAL, CONSEQUENTIAL, EXEMPLARY OR INCIDENTAL
DAMAGES (INCLUDING LOST OR ANTICIPATED REVENUES OR PROFITS RELATING TO THE
SAME), ARISING FROM ANY CLAIM RELATING TO THIS AGREEMENT, WHETHER SUCH CLAIM IS
BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE) OR OTHERWISE, EVEN IF AN
AUTHORIZED REPRESENTATIVE OF SUCH PARTY IS ADVISED OF THE POSSIBILITY OR
LIKELIHOOD OF SAME.

      10.6 No Implied Obligations. Licensee's sole obligation to exploit the
Scripps Patent Rights and Scripps Technology is as set forth in Section 4.1.
Nothing in this Agreement shall be deemed to require Licensee to otherwise
exploit the Scripps Patent Rights or Scripps Technology nor prevent Licensee
from commercializing products similar to or competitive with a Licensed Product.

      10.7 Headings. The headings for each article and section in this Agreement
have been inserted for convenience of reference only and are not intended to
limit or expand on the meaning of the language contained in the particular
article or section.

      10.8 Severability. Should any one or more of the provisions of this
Agreement be held invalid or unenforceable by a court of competent jurisdiction,
it shall be considered severed from this Agreement and shall not serve to
invalidate the remaining provisions thereof. The parties shall make a good faith
effort to replace any invalid or unenforceable provision with a 

<PAGE>

valid and enforceable one such that the objectives contemplated by them when
entering this Agreement may be realized.

      10.9 No Waiver. Any delay in enforcing a party's rights under this
Agreement or any waiver as to a particular default or other matter shall not
constitute a waiver of such party's rights to the future enforcement of its
rights under this Agreement, excepting only as to an express written and signed
waiver as to a particular matter for a particular period of time.

      10.10 Name. Whenever there has been an assignment by Licensee as permitted
by this Agreement, the term "Licensee" as used in this Agreement shall also
include and refer to, if appropriate, such assignee.

      10.11 Notices. Any notices required by this Agreement shall be in writing,
shall specifically refer to this Agreement and shall be sent by registered or
certified airmail, postage prepaid, or by telefax, telex or cable, charges
prepaid, or by overnight courier, postage prepaid and shall be forwarded to the
respective addresses set forth below unless subsequently changed by written
notice to the other party:

      For Scripps       The Scripps Research Institute
                        10550 North Torrey Pines Road, TPC-9
                        La Jolla, California 92037
                        Attn: Director, Technology Development
                        Fax No.: (619) 784-9910

      For Licensee:     StemCells, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: Research Director
                        Fax No.: (401) 333-0684

      with a copy to:   CytoTherapeutics, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: General Counsel
                        Fax No.: (401) 334-9152

Notice shall be deemed delivered upon the earlier of (i) when received, (ii)
three (3) days after deposit into the mail, or (iii) the date notice is sent via
telefax, telex or cable, (iv) the day immediately following delivery to
overnight courier (except Sunday and holidays).

      10.12 Compliance with U. S. Laws. Nothing contained in this Agreement
shall require or permit Scripps or Licensee to do any act inconsistent with the
requirements of any United States law, regulation or executive order as the same
may be in effect from time to time.

      IN WITNESS WHEREOF, the parties have executed this Agreement by their duly
authorized representatives as of the date set forth above.

<PAGE>

SCRIPPS:                               LICENSEE:


THE SCRIPPS RESEARCH INSTITUTE         STEMCELLS, INC.


By:                                    By:                                
- -------------------------------        -----------------------------------


Title:                                 Title:
- -------------------------------        -----------------------------------

<PAGE>

                                    EXHIBIT A

                            DISCLOSURE OF TECHNOLOGY

[*        ]

*This confidential portion has been omitted and filed separately with the 
 Commission



<PAGE>

                                    EXHIBIT B

                              SCRIPPS PATENT RIGHTS

              [To be updated once patent applications are filed]

<PAGE>

                                                                   EXHIBIT 10.85

                                  EXHIBIT 10.85

                           Scripps Research Institute
                                License Agreement
                                     98-126

<PAGE>

                                                                   Exhibit 10.85

                                LICENSE AGREEMENT

      This License Agreement is entered into and made effective as of this
____day of November, 1998, by and between THE SCRIPPS RESEARCH INSTITUTE, a
California nonprofit public benefit corporation ("Scripps") located at 10550
North Torrey Pines Road, La Jolla, California 92037, and STEMCELLS, INC., a
California corporation ("Licensee") with offices at 701 George Washington
Highway, Lincoln, Rhode Island 02865, a wholly-owned subsidiary of
CytoTherapeutics, Inc. ("CTI"), with respect to the facts set forth below.

                                    RECITALS

      A. Scripps and Licensee have entered into a Research Funding and Option
Agreement effective as of November 14, 1997 (the "Research Agreement"), pursuant
to which Licensee agreed to fund certain research conducted in Dr. Nora
Sarvetnick's laboratory at Scripps (the "Research Program").

      B. Scripps is engaged in fundamental scientific biomedical and biochemical
research, including research relating to pancreatic stem and progenitor cells,
as more particularly described herein.

      C. Licensee is engaged in research and development of stem and progenitor
cells for the diagnosis, treatment and prophylaxis of diseases and other
conditions in humans and animals.

      D. Scripps has disclosed to Licensee certain technology described in that
certain invention disclosure, a copy of which is attached hereto as Exhibit A
and incorporated herein by reference (the "Invention(s)")

      E. Scripps has the exclusive right to grant a license to the technology
described in Exhibit A, subject to certain rights of the U.S. Government to use
such technology for its own purposes, resulting from the receipt by Scripps of
certain funding from the U. S. Government.

      F. Scripps desires to grant to Licensee, and Licensee wishes to acquire,
an exclusive worldwide right and license to the technology described in the
Exhibit A and to certain patent rights and know-how of Scripps with respect
thereto, subject to the terms and conditions set forth herein, with a view to
developing and marketing products within the Field (as defined below).

<PAGE>

                                    AGREEMENT

      NOW, THEREFORE, in consideration of the mutual covenants and conditions
set forth herein, Scripps and Licensee hereby agree as follows:

1. Definitions. Capitalized terms shall have the meaning set forth below.

      1.1 Affiliate. The term "Affiliate" shall mean any entity which directly
or indirectly controls, is controlled by or is under common control with
Licensee. The term "control" as used herein means the possession of the power to
direct or cause direction of the management and the policies of an entity,
whether through the ownership of a majority of the outstanding voting securities
or by contract or otherwise.

      1.2 Confidential Information. The term "Confidential Information" shall
mean any and all proprietary or confidential information of Scripps or Licensee
which may be exchanged between the parties at any time and from time to time
during the term of this Agreement. Information shall not be considered
confidential to the extent that it:

            (a) Is publicly disclosed through no fault of any party hereto,
      either before or after it becomes known to the receiving party; or

            (b) Was known to the receiving party prior to the date of this
      Agreement, which knowledge was acquired independently and not from another
      party hereto (or such party's employees); or

            (c) Is subsequently disclosed to the receiving party in good faith
      by a third party who has a right to make such disclosure; or

            (d) Has been published by a third party as a matter of right.

      1.3 Field. The term "Field" shall mean [*                         ].

      1.4 Licensed Product. The term "Licensed Product" shall mean a product,
the manufacture, sale or use of which would but for the license granted herein,
infringe a Valid Claim in the country for which such product is sold. Without
limiting the foregoing, Licensed Product shall also include a product the
manufacture, sale or use of a particular product would but for the license
granted herein infringe a Valid Claim in the United States and at least two (2)
Major Countries, in such case irrespective of where such product is made, sold
or used and irrespective of whether such product is covered by a Valid Claim in
the country where sold.

      1.5 Major Countries. The term "Major Countries" shall mean France,
Germany, Italy and the United Kingdom.




* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

      1.6 Net Sales. The term "Net Sales" shall mean the total amount invoiced
to third parties on sales of Licensed Products by Licensee, its Affiliates, or
Sublicensees, for which royalties are due under Article 3 below, less the
following reasonable and customary deductions to the extent applicable to such
invoiced amounts: (i) all trade, cash and quantity credits, discounts, refunds
or government rebates; (ii) amounts for claims, allowances or credits for
returns, retroactive price reductions, or chargebacks; (iii) packaging, handling
fees and prepaid freight, sales taxes, duties and other governmental charges
(including value added tax); and (iv) provisions for uncollectible accounts
determined in accordance with reasonable accounting practices, consistently
applied to all products of the selling party; provided, however, that in the
case of Patient-Specific Licensed Products, "Net Sales" shall equal 
[*           ] of the foregoing amounts (after the deductions described in (i)
through (iv) above). For purposes of the foregoing, it is understood that Net
Sales shall include only the amount invoiced for materials consisting of
Licensed Products (less the foregoing deductions and adjustments) and shall not
include charges related to services (other than cell separation and expansion)
performed in connection with the sale of such Licensed Products; accordingly,
Net Sales shall not include, without limitation, charges for apheresis,
reinfusion, surgical procedures, hospital stays or the like. For the removal of
doubt, Net Sales shall not include sales by Licensee to its Affiliates for
resale, provided that if Licensee sells a Licensed Product to an Affiliate for
resale, Net Sales shall include the amounts invoiced by such Affiliate to third
parties on the resale of such Licensed Product. In the event that Licensee
grants a sublicense hereunder, and receives payments based upon the
Sublicensee's sales of Licensed Products, Licensee may upon approval by Scripps,
which approval shall not be unreasonably withheld, substitute the definition of
"Net Sales," used by the Sublicensee to calculate payments to Licensee in place
of the foregoing definition of "Net Sales" for purposes of calculating royalties
payable to Scripps on such Sublicensee's sales.

      1.7 Patient-Specific Licensed Product. The term "Patient-Specific Licensed
Product shall mean a Licensed Product that includes either (i) autologous cells
from the patient; or (ii) nonautologous cells that otherwise are not intended
for use in all patients (such as Licensed Products that are fetal cells
expressing an HLA-type compatible with the particular patient but not optimally
compatible with patients who have a different HLA type).

      1.8 Scripps Patent Rights. The term "Scripps Patent Rights" shall mean all
rights resulting from:

            (a) all worldwide patent and patent applications claiming the
      Scripps Technology described in Exhibit A hereto (the "Existing Patents");
      and

            (b) all divisions, continuations, continuations-in-part, patents of
      addition, and substitutions of the Existing Patents, together with all
      registrations, reissues, reexaminations or extensions of any kind with
      respect to any of the foregoing patents to the extent the same claim
      Scripps Technology.



* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

      From time to time during the term of this Agreement the parties agree to
record and update on Exhibit B all patents and patent applications within the
Scripps Patent Rights

      In the event that Scripps and Licensee are joint owners of an invention by
reason of the fact that personnel of both Scripps and Licensee are joint
inventors of such invention, it is understood that the Scripps Patent Rights
include only Scripps' rights as a joint owner of the patent applications and
patents that claim such joint invention.

      1.9 Scripps Technology. The term "Scripps Technology" shall mean so much
of the technology as is proprietary to Scripps that was developed in performance
of the Research Program and in the disclosure provided to Licensee pursuant to
Section 3.2 or 3.3 of the Research Agreement, a copy of which is attached as
Exhibit A hereto and incorporated herein by reference, together with materials,
information and know-how related thereto from the Research Program as described
Exhibit A whether or not the same is eligible for protection under the patent
laws of the United States or elsewhere, and whether or not any such processes
and technology, or information related thereto, would be enforceable as a trade
secret or the copying of which would be enjoined or restrained by a court as
constituting unfair competition.

      1.10 Sublicensee. The term "Sublicensee" shall mean any non-Affiliate
third party to whom Licensee has granted the right to manufacture and sell
Licensed Products, with respect to Licensed Products made and sold by such third
party.

      1.11 Valid Claim. The term "Valid Claim" shall mean a claim of an issued
and unexpired patent or a claim of a pending patent application within the
Scripps Patent Rights which has not been held unpatentable, invalid or
unenforceable by a court or other government agency of competent jurisdiction
and has not been admitted to be invalid or unenforceable through reissue,
reexamination, disclaimer or otherwise; provided, however, that if the holding
of such court or agency is later reversed by a court or agency with overriding
authority, the claim shall be reinstated as a Valid Claim with respect to Net
Sales made after the date of such reversal. Notwithstanding the foregoing
provisions of this Section 1.11, if a claim of a pending patent application
within the Scripps Patent Rights has not issued as a claim of an issued patent
within the Scripps Patent Rights, within five (5) years after the filing date
from which such claim takes priority, such pending claim shall not be a Valid
Claim for purposes of this Agreement.

2. License Terms and Conditions.

      2.1 Grant of License.

      (a) Scripps hereby grants to Licensee an exclusive, worldwide license,
including the right to sublicense, to: make, use, sell, import, export or
otherwise distribute Licensed Products; practice any method, process or
procedure, and otherwise exploit the Scripps Patent Rights; and to have any of
the foregoing performed on its

<PAGE>

behalf by a third party, in each case solely within the Field, subject to the
terms of this Agreement.

      (b) Scripps hereby grants to Licensee a non-exclusive, worldwide license,
including the right to sublicense to and under the Scripps Technology for the
purpose of exercising its rights and licenses under the Scripps Patent Rights.

      2.2 Royalties. In consideration for the exclusive license granted pursuant
to Section 2.1 hereof, Licensee shall pay to Scripps a continuing royalty the
following percentages of Net Sales of each Licensed Product by Licensee, its
Affiliates and Sublicensees: (i) [*               ] of Net Sales in Patent
Countries and (ii) [*             ] in Non-Patent Countries. For purposes of
calculating royalties due hereunder, a "Patent Country" shall mean, with respect
to a particular Licensed Product, a country in which at the time of the sale of
such Licensed Product in such country, the manufacture, use or sale of such
Licensed Product would infringe a Valid Claim in such country; and a "Non-Patent
Country" shall mean, with respect to such Licensed Product, a country which a
the time of sale of such Licensed Product in such country is not a Patent
Country.

      2.3 Milestone Payments. As additional consideration for the exclusive
license granted pursuant to Section 2.1 hereof, Licensee agrees to pay to
Scripps upon the first occurrence of each milestone specified below for the
first Licensed Product to meet such milestone:

                   MILESTONES                                PAYMENT
                   ----------                                -------

1.    First initiation of Phase II Trials for the first      [*        ]
      Licensed Product.

2.    First initiation of Phase III Trials for the first     [*        ]
      Licensed Product.

3.    First receipt of government approval to market and     [*        ]
      distribute the first Licensed Product in the United 
      States or the first Major Country.

For purposes of the foregoing milestones, "Phase II Trials" shall mean that
portion of the clinical studies for the FDA submission and approval process
which provides for the initial trials of a Licensed Product for the purposes of
determining the efficacious therapeutic dose range and evaluating safety in the
proposed therapeutic indication as more fully defined in 21 C.F.R. ss.
312.21(b), or a similar clinical study in a country other than the United
States; and "Phase III Trials" shall mean that portion of the clinical studies
for the FDA submission and approval process which provides for trials of a
Licensed Product on sufficient numbers of patients to establish the safety and
efficacy of such Licensed Product to support regulatory approval in the proposed
application as 



* This confidential portion has been omitted and filed separately with the 
  Commission


<PAGE>

more fully defined in 21 C.F.R. ss. 3122.21(c), or similar clinical study in a
country other than the United States.

      2.4 Combination Products.

            2.4.1 Definition of Combination Product. As used herein, the term
"Combination Product" shall mean a Licensed Product which cannot be
manufactured, used or sold without infringing Scripps Patent Rights licensed
hereunder in the country where sold which is sold with another product,
component or service for which no royalty would be due hereunder if sold
separately.

            2.4.2 Royalty Payable on Combination Products. The royalty payable
on Combination Products shall be the royalty rate set forth in Section 2.2 above
based on a pro rata portion of Net Sales of Combination Products in accordance
with the following formula:

                                  A
                               X= -
                                  A + B, where

                        X = the pro rata portion of Net Sales attributable to
                        Scripps Patent Rights or other Scripps Technology
                        licensed herein (expressed as a percentage), and

                        A = the fair market value of the Licensed Product
                        component, and

                        B = the fair market value of all other components
                        (product, component or service) in the Combination
                        Product.

The fair market values described above shall be determined by the parties hereto
in good faith. Notwithstanding the foregoing, in the event that there is no
separate fair market values of the Licensed Product and such other product(s),
component(s) and/or services(s), then the Net Sales shall be as reasonably
allocated by Licensee between such Licensed Product and such other product(s),
component(s) and/or service(s), based upon their relative importance and
proprietary position, subject to the consent of Scripps, which consent shall not
be unreasonably withheld.

      2. 5 Multiple Royalties. If Licensee, its Affiliate or Sublicensee is
required to pay a non-Affiliate third party amounts with respect to a Licensed
Product under agreements for patent rights or other technologies which Licensee,
its Affiliate or Sublicensee, in its reasonable judgment, determines are
necessary or desirable to license or acquire with respect to such Licensed
Product, Licensee may deduct such amount owing to such non-Affiliate third
parties (prior to any reductions) from the royalty owing to Scripps for the sale
of such Licensed Product pursuant to Section 2.2 above. Notwithstanding the
foregoing provisions of this Section 2.5, in no event shall the

<PAGE>

royalties due to Scripps pursuant to Section 2.2 above be so reduced to less
than fifty percent (50%) of the amount that would otherwise be due Scripps
thereunder.

      2.6 Quarterly Payments.

            2.6.1 Sales by Licensee. With regard to Net Sales made by Licensee
or its Affiliates, royalties shall be payable by Licensee quarterly, within
sixty (60) days after the end of each calendar quarter, based upon the Net Sales
of Licensed Products during such preceding calendar quarter, commencing with the
calendar quarter in which the first commercial sale of any Licensed Product is
made.

            2.6.2 Sales by Sublicensees. With regard to Net Sales made by
Sublicensees of Licensee or its Affiliates, royalties shall be payable by
Licensee quarterly, within ninety (90) days after the end of each calendar
quarter, based upon the Net Sales of Licensed Products by such Sublicensee
during such preceding calendar quarter, commencing with the calendar quarter in
which the first commercial sale of any Licensed Product is made by such
Sublicensee.

      2. 7 Term of License. Unless terminated sooner in accordance with the
provisions of this Agreement, the term of this license shall expire when the
last of the royalty obligations set forth has expired (i.e., until expiration,
revocation or invalidation of the last patent or the abandonment of the last
application within the Scripps Patent Rights, whichever is later).
Notwithstanding the foregoing, if applicable government regulations require a
shorter term and/or a shorter term of exclusivity than provided for herein, then
the term of this License Agreement shall be so shortened or this License
Agreement shall be amended to provide for a non-exclusive license, and, in such
event, the parties shall negotiate in good faith to reduce appropriately the
royalties payable as set forth under the section heading "Royalties" hereof.
Notwithstanding anything herein to the contrary, Licensee's license under
Section 2.l(b) with respect to the Scripps Technology shall survive the
expiration, (but not an earlier termination, except as provided in Section 8.6
below) of this Agreement.

      2.8 Sublicense. Licensee shall have the sole and exclusive right to grant
sublicenses to any party with respect to the rights conferred upon Licensee
under this Agreement, provided, however, that any such sublicense shall be
subject in all respects to the restrictions, exceptions, royalty obligations,
reports, termination provisions, and other provisions contained in this
Agreement. Without limiting the foregoing, Licensee agrees to provide Scripps a
copy of each such sublicense agreement within thirty (30) days of the execution
thereof. Licensee shall pay Scripps, or cause its Affiliate or Sublicensee to
pay Scripps, the same royalties on all Net Sales of such Affiliate or
Sublicensee the same as if said Net Sales had been made by Licensee. Each
Affiliate and Sublicensee shall report its Net Sales to Scripps through
Licensee, which Net Sales shall be aggregated with any Net Sales of Licensee for
purposes of determining the Net Sales upon which royalties are to be paid to
Scripps.

<PAGE>

      2.9 Reports. Licensee shall furnish to Scripps at the same time as each
royalty payment is made by Licensee, a detailed written report of Net Sales of
the Licensed Products and the royalty due and payable thereon, including a
description of any offsets or credits deducted therefrom, on a
product-by-product and country-by-country basis, for the calendar quarter upon
which the royalty payment is based.

      2.10 Records. Licensee shall keep, and cause its Affiliates and
Sublicensees to keep, full, complete and proper records and accounts of all
sales of Licensed Products in sufficient detail to enable the royalties payable
on Net Sales of each Licensed Product to be determined. Scripps shall have the
right to appoint an independent certified public accounting firm approved by
Licensee, which approval shall not be unreasonably withheld, to audit the
records of Licensee, its Affiliates and Sublicensees as necessary to verify the
royalties payable pursuant to this Agreement. Licensee, its Affiliates and
Sublicensees shall pay to Scripps an amount equal to any additional royalties to
which Scripps is entitled as disclosed by the audit, plus interest thereon at
the rate of one and one-half percent (1.5%) per month. Such audit shall be at
Scripps' expense; provided, however, that if the audit discloses that Scripps
was underpaid royalties with respect to the period covered by the audit by at
least five percent (5%), then Licensee, its Affiliates or Sublicensee, as the
case may be, shall reimburse Scripps for all reasonable out-of-pocket audit
costs. Scripps may exercise its right of audit as to each of Licensee, its
Affiliates or Sublicensees no more frequently than once in any calendar year.
The accounting firm shall disclose to Scripps only information relating to the
accuracy of the royalty payments. Licensee, its Affiliates and Sublicensees
shall preserve and maintain all such records required for audit for a period of
three (3) years after the calendar quarter to which the record applies.

      2.11 Foreign Sales. The remittance of royalties payable on sales outside
the United States shall be payable to Scripps in United States Dollar
equivalents at the official rate of exchange of the currency of the country from
which the royalties are payable, as quoted in the Wall Street Journal for the
last business day of the calendar quarter in which the royalties are payable. If
the transfer of or the conversion into the United States Dollar equivalents of
any such remittance in any such instance is not lawful or possible, the payment
of such part of the royalties as is necessary shall be made by the deposit
thereof, in the currency of the county where the sale was made on which the
royalty was based to the credit and account of Scripps or its nominee in any
commercial bank or trust company of Scripps' choice located in that country,
prompt written notice of which shall be given by Licensee to Scripps and except
as set forth in Section 2.10 above, Licensee shall have no further obligation
with respect to such royalties.

      2.12 Foreign Taxes. Any tax required to be withheld by Licensee under the
laws of any foreign country for the accounts of Scripps shall be promptly paid
by Licensee for and on behalf of Scripps to the appropriate governmental
authority, and Licensee shall use its best efforts to furnish Scripps with proof
of payment of such tax together with official or other appropriate evidence
issued by the applicable government 

<PAGE>

authority. Any such tax actually paid on Scripps' behalf shall be deducted from
royalty payments due Scripps hereunder.

      2.13 Single Payments. The parties hereto acknowledge that the parties 
may enter into multiple license agreements with respect to technologies 
arising out of the Research Agreement, including this Agreement 
(collectively, the "Scripps License Agreements") pursuant to which Licensee 
will owe royalties and milestone payments. Notwithstanding anything herein to 
the contrary, with respect to any unit of Licensed Product only a single 
royalty shall be due to Scripps at the highest applicable rate for such unit 
regardless if such Licensed Product is covered by more than one Valid Claim 
or would be a Licensed Product under more than one Scripps License Agreement. 
(For example, if a product sold by Licensee is a Licensed Product under this 
Agreement for which Licensee owes Scripps a royalty of [*  ] of Net Sales and 
Licensee would otherwise owe Scripps a royalty of [*  ] of Net Sales of such 
product under another Scripps License Agreement, Licensee's royalty 
obligation to Scripps shall be fulfilled by paying Scripps [*   ] of Net Sales 
with respect to sales of such License Product.) Likewise, with respect to the 
milestone payments under Section 2.3 above, once such milestone payment has 
been paid for a Licensed Product under any Scripps License Agreement then 
Licensee's obligation to pay such milestone shall be deemed to be fulfilled 
with respect to all Scripps License Agreement, regardless of whether the 
product for which such a milestone payment was paid was a "Licensed Product" 
for purposes of a particular Scripps License Agreement or not. (For example, 
if a Licensee initiates Phase II Trials for a product, which product falls 
within the definition of "Licensed Product" under this Agreement and pays 
Scripps the corresponding $[*      ] payment, Licensee shall have no further 
obligation to pay any amounts to Scripps with respect to any other product 
under any Scripps License Agreement upon the initiation of Phase II Trials 
for a Licensed Product whether or not the product for which Licensee 
initially paid such milestone payment is a Licensed Product for purposes of 
any other Scripps License Agreement.)

3. Patent Matters.

      3.1 Patent Prosecution and Maintenance. From and after the date of this
Agreement, the provisions of this Section 3 shall control the prosecution and
maintenance of any patent or patent application included within Scripps Patent
Rights. Subject to the requirements, limitations and conditions set forth in
this Agreement, Scripps shall direct and control (i) the preparation, filing and
prosecution of the United States and foreign patent applications within Scripps
Patent Rights (including any interferences and foreign oppositions) and (ii)
maintain the patents issuing therefrom. Scripps shall select the patent
attorney, subject to Licensee's written approval, which approval shall not be
unreasonably withheld. Both parties hereto agree that Scripps may, at its sole
discretion, utilize Scripps' Office of Patent Counsel in lieu of outside counsel
for patent prosecution and maintenance described herein, and the fees and
expenses incurred by Scripps with respect to work done by such Office of Patent
Counsel shall be paid as set forth below. Licensee shall have full rights of
consultation with the patent attorney so selected on all matters relating to
Scripps Patent Rights. 




* This confidential portion has been omitted and filed separately with the 
  Commission


<PAGE>

Scripps shall use its best efforts to implement all reasonable requests made by
Licensee with regard to the preparation, filing, prosecution and/or maintenance
of the patent applications and/or patents within Scripps Patent Rights.

      3.2 Information to Licensee. Scripps agrees to use reasonable efforts to
(i) keep Licensee informed as to the filing, prosecution and maintenance of
patents and patent applications within the Scripps Patent Rights, (ii) furnish
to Licensee copies of documents relevant to any such filing, prosecution and
maintenance and (iii) allow Licensee reasonable opportunity to comment on
documents filed with any patent office which would affect the Scripps Patent
Rights or Licensee' rights hereunder.

      3.3 Patent Costs. Licensee acknowledges and agrees that Scripps does not
have independent funding to cover patent costs, and that the license granted
hereunder is in part in consideration for Licensee's assumption of patent costs
and expenses as described herein. Licensee shall pay for all expenses incurred
by Scripps pursuant to Section 3.1 hereof. In addition, Licensee agrees to
reimburse Scripps for all patent costs and expenses paid or incurred by Scripps
to date in connection with Scripps Patent Rights licensed hereunder. Licensee
agrees to pay all such past and future patent expenses directly or to reimburse
Scripps for the payment of such expenses within sixty (60) days after Licensee
receives an itemized invoice therefor. In the event Licensee elects to
discontinue payment for the filing, prosecution and/or maintenance of any patent
application and/or patent within Scripps Patent Rights, any such patent
application or patent shall be excluded from the definition of Scripps Patent
Rights and from the scope of the license granted under this Agreement, and all
rights relating thereto shall revert to Scripps and may be freely licensed by
Scripps. Licensee shall give Scripps at least sixty (60) days' prior written
notice of such election. No such notice shall have any effect on Licensee's
obligations to pay expenses incurred up to the effective date of such election.

      3.4 Ownership. Subject to any joint or mutual ownership of Licensee by
virtue of joint inventorship of inventions covered therein, the patent
applications filed and patent applications obtained by Scripps pursuant to
Section 3.1 hereof shall be owned solely by Scripps, assigned to Scripps and
deemed a part of Scripps Patent Rights.

      3.5 Scripps Right to Pursue Patent. If at any time during the term of this
Agreement, Licensee's rights with respect to Scripps Patent Rights are
terminated, Scripps shall have the right to take whatever action Scripps deems
appropriate to obtain or maintain the corresponding patent protection at its own
expense. If Scripps pursues patents under this Section 3.5, Licensee agrees to
cooperate fully, including by providing, at no charge to Scripps, all
appropriate technical data and executing all necessary legal documents.

      3.6 Prosecution by Licensee. If Scripps elects not to file, prosecute or
maintain any patent application or patent within the Scripps Patent Rights or
pay any fee related thereto, in any country Scripps shall promptly notify
Licensee of such

<PAGE>

election, but in no case later than sixty (60) prior to any required action
relating to the filing, prosecution or maintenance of such patent application or
patent. In such event, if Licensee elects to take over the filing, prosecution
and/or maintenance of one or more patents or patent applications within the
Scripps Patent Rights, Licensee shall have the right, at its option, to control
the filing, prosecution and/or maintenance of any such patent applications or
patents within the Scripps Patent Rights at its own expense. In which case
Licensee shall keep Scripps reasonably informed on matters regarding such
filing, prosecution and maintenance.

      3.7 Infringement.

            3 .7.1 Enforcement. If either party determines that a third party is
making, using or selling a product that may infringe the Scripps Patent Rights,
that party shall notify the other party in writing.

            (a) Licensee shall have the first right (itself or through others),
at its sole option, to bring suit to enforce the Scripps Patent Rights, and/or
to defend any declaratory judgment action with respect thereto, in each case
with respect to the manufacture, sale or use of a product within the Field;
provided, however, that Licensee shall keep Scripps reasonably informed as to
the defense and/or settlement of such action. Scripps shall have the right to
participate in any such action with counsel of its own choice at its own
expense.

            (b) In the event Licensee elects not to initiate an action to
enforce the Scripps Patent Rights against a commercially significant
infringement by a third party within the Field, within one (1) year of a request
by Scripps to do so, (or within such shorter period which may be required to
preserve the legal rights of Scripps under the laws of the relevant government),
Scripps may initiate such action at its expense with Licensee's prior written
consent, which consent shall not be unreasonably withheld. Licensee shall have
the right to participate in any such action with counsel of its own choice at
its own expense.

            (c) All recoveries received by a party from an action to enforce the
Scripps Patent Rights shall be first applied to reimburse the controlling
party's and then the non-controlling party's unreimbursed expenses, including
without limitation, reasonable attorney's fees and court costs. Any remainder
shall, to the extent the same pertains to an infringement of the Scripps Patent
Rights, be divided [*              ] to Licensee and [*                 ] to
Scripps.

            3.7.2 Defense. If Licensee, its Affiliate, Sublicensee, distributor
or other customer is sued by a third party charging infringement of patent
rights that dominate a claim of the Scripps Patent Rights or that cover other
Related Material with respect to the manufacture, use, distribution or sale of a
Licensed Product, Licensee will promptly notify Scripps. As between the parties
to this Agreement, Licensee will be entitled to control the defense in any such
action(s) and withhold [*         ] of the royalties related to such Licensed
Product otherwise payable to Scripps and use the withheld 




* This confidential portion has been omitted and filed separately with the 
  Commission


<PAGE>

royalties to reimburse the legal defense costs, attorneys' fees and liability
incurred in such infringement suit(s). Notwithstanding the foregoing, Licensee
agrees to withhold only that portion of such royalties as may reasonably be
necessary to reimburse amounts in accordance with this Section 3.7.2. If
Licensee is required to pay a royalty to a third party to make and/or sell a
Licensed Product as a result of a final judgment or settlement, such amounts may
be deducted from the running royalties payable to Scripps hereunder in relation
to such Licensed Product; provided that such royalties shall not be so reduced
by more than [*               ]. Subject to the provisions of Section 4.3
below, Licensee agrees to indemnify and hold Scripps harmless from any costs,
expenses or liability arising out of all such infringements or charges of
infringement.

            3.7.3 Cooperation. In any suit, action or other proceeding in
connection with enforcement and/or defense of the Scripps Patent Rights, each
party hereto agrees to cooperate fully, including without limitation by joining
as a party plaintiff and executing such documents as the other party may
reasonably request. Without limiting the foregoing, upon the request of and, at
the expense of a party controlling any suit, action or other proceeding pursuant
to this Article 3, the other party shall make available at reasonable times and
under appropriate conditions all relevant personnel, records, papers,
information, samples, specimens and other similar materials in such other
party's possession.

            3.7.4 No Implied Obligations. Except as expressly provided in this
Section 3.7, neither party has any obligation to bring or prosecute actions or
suits against any third party for patent infringement.

4. Obligations Related to Commercialization.

      4.1 Commercial Development Obligation. In order to maintain the license
granted hereunder in force, Licensee shall use reasonable efforts and due
diligence to develop Scripps Technology and Scripps Patent Rights which are
licensed hereunder into commercially viable Licensed Products, as promptly as is
reasonably and commercially feasible, and thereafter to produce and sell
reasonable quantities of Licensed Products. Licensee shall keep Scripps
generally informed as to Licensee's progress in such development, production and
sale, including its efforts, if any, to sublicense Scripps Technology and
Scripps Patent Rights, and Licensee shall deliver to Scripps an annual written
report and such other reports as Scripps may reasonably request. The parties
hereto acknowledge and agree that achievement of mutually agreeable milestones
shall be evidence of compliance by Licensee with its commercial development
obligations hereunder. Notwithstanding the foregoing, if Licensee believes that
it cannot, within the exercise of prudent and reasonable business judgment,
perform any mutually agreed upon milestones within the time period required
therefor, Licensee may request an extension of time for the performance date to
a date that Licensee believes to be reasonable and prudent and Scripps shall
agree to any requested extension which is not more than one (l) year in length
from the originally required date and will not unreasonably withhold consent to
requests for longer 




* This confidential portion has been omitted and filed separately with the
  Commission

<PAGE>

extensions. In the event Scripps has a reasonable basis to believe that Licensee
is not using reasonable efforts and due diligence as required hereunder, upon
notice by Scripps to Licensee which specifies the basis for such belief, Scripps
and Licensee shall negotiate in good faith to attempt to mutually resolve the
issue. In the event Scripps and Licensee cannot agree upon any matter related to
Licensee's commercial development obligations, the parties agree to utilize
arbitration pursuant to Section 10.2 hereof in order to resolve the matter. If
the arbitrator determines that Licensee has not complied with its obligations
hereunder, and such default is not cured within sixty (60) days after the
arbitrator's decision, Scripps may terminate Licensee's rights under this
Agreement.

      4.2 Governmental Approvals and Marketing of Licensed Products. Licensee
shall be responsible for obtaining all necessary governmental approvals for the
development, production, distribution, sale and use of any Licensed Product, at
Licensee's expense, including, without limitation, any safety studies. Licensee
shall have sole responsibility for any warning labels, packaging and
instructions as to the use of Licensed Products and for the quality control for
any Licensed Product.

      4.3 Indemnity. Licensee hereby agrees to indemnify, defend and hold
harmless Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents from and against any
liability or expense arising from any product liability claim asserted by any
party as to any Licensed Product or any claims arising from the use of any
Scripps Patent Rights or Scripps Technology pursuant to this Agreement. Such
indemnity and defense obligation shall apply to any product liability or other
claims, including without limitation, personal injury, death or property damage,
made by employees, subcontractors, sublicensees, or agents of Licensee, as well
as any member of the general public. Notwithstanding the foregoing, Licensee's
obligation to provide indemnification under this Section 4.3 shall be subject to
each party seeking indemnification hereunder (i) promptly notify Licensee in
writing of any claim, suit or proceeding with respect to which the party intends
to claim such indemnification, (ii) give Licensee sole control of the defense
and/or settlement thereof, and (iii) provide Licensee, at Licensee's expense,
with reasonable assistance and full information with respect to such claim, suit
or proceeding. Licensee shall not settle any claim, suit or proceeding subject
to this Section 4.3 or otherwise consent to an adverse judgment in such claim,
suit or proceeding if the same materially diminishes the rights or interests of
the indemnified party without the express written consent of such party.
Licensee shall have no obligation for any claim, suit or proceeding if the party
seeking indemnification makes any settlement regarding such claim, suit or
proceeding without the prior written consent of Licensee, which consent shall
not be unreasonably withheld. Licensee shall use its best efforts to have
Scripps and any parent, subsidiary or other affiliated entity and their
trustees, officers, employees, scientists and agents named as additional insured
parties on any product liability insurance policies maintained by Licensee, its
Affiliates and sublicensees applicable to Licensed Products.

      4.4 Patent Marking. To the extent required by applicable law, Licensee
shall mark all Licensed Products or their containers in accordance with the
applicable patent marking laws.

<PAGE>

      4.5 No Use of Name. Except as required by law, the use of the name "The
Scripps Research Institute", " Scripps", or any variation thereof in connection
with the advertising or sale of Licensed Products is expressly prohibited.

      4.6 U.S. Manufacture. To the extent required by applicable United States
laws, if at all, Licensee agrees that Licensed Products will be manufactured in
the United States, or its territories, subject to such waivers as may be
required, or obtained, if at all, from the United States Department of Health
and Human Services, or its designee.

      4.7 Foreign Registration. Licensee agrees to register this Agreement with
any foreign governmental agency which requires such registration, and Licensee
shall pay all costs and legal fees in connection therewith. In addition,
Licensee shall assure that all foreign laws affecting this Agreement or the sale
of Licensed Products are fully satisfied.

5. Limited Warranty. Scripps hereby represents and warrants that subject to the
rights of the United States Government (i) it has sole right and power to enter
into this Agreement and grant the rights and licenses granted herein; (ii)
Scripps is and shall be the owner of the entire right, title, and interest in
and to the Scripps Patent Rights; (iii) Scripps has not previously granted and
will not grant any rights in the Scripps Patent Rights that are inconsistent
with the rights and licenses granted to Licensee herein; and (iv) to the best of
its knowledge, there are no claims of third parties that would call into
question the rights of Scripps to grant to Licensee the rights contemplated
hereunder. EXCEPT AS PROVIDED IN THIS SECTION 5, NEITHER PARTY MAKES ANY
WARRANTIES OR CONDITIONS (EXPRESS, IMPLIED, STATUTORY OR OTHERWISE) WITH RESPECT
TO THE SUBJECT MATTER HEREOF. SPECIFICALLY, SCRIPPS MAKES NO OTHER WARRANTIES
CONCERNING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT, INCLUDING WITHOUT LIMITATION, ANY EXPRESS OR IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AS TO SCRIPPS PATENT RIGHTS,
SCRIPPS TECHNOLOGY OR ANY LICENSED PRODUCT. SCRIPPS MAKES NO WARRANTY OR
REPRESENTATION AS TO THE VALIDITY OR SCOPE OF SCRIPPS PATENT RIGHTS, OR THAT ANY
LICENSED PRODUCT WILL BE FREE FROM AN INFRINGEMENT ON PATENTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES, OR THAT NO THIRD PARTIES ARE IN
ANY WAY INFRINGING SCRIPPS PATENT RIGHTS OR SCRIPPS TECHNOLOGY COVERED BY THIS
AGREEMENT.

6. Interests in Intellectual Property Rights.

      6.1 Preservation of Title. Scripps shall retain full ownership and title
to Scripps Technology, and Scripps Patent Rights licensed hereunder and shall
use its reasonable best efforts to preserve and maintain such full ownership and
title, subject to Licensee fully performing all of its obligations under this
Agreement.

<PAGE>

      6.2 Royalty-free License to Improvements. Licensee hereby grants to
Scripps a non-exclusive, royalty-free license to any improvement to Scripps
Technology developed by Licensee during the term of this Agreement, to use for
Scripps own non-commercial research purposes or grant to other nonprofit
institutions for their non-commercial research purposes.

      6.3 Governmental Interest. Licensee and Scripps acknowledge that Scripps
has received, and expects to continue to receive, funding from the United States
Government in support of Scripps' research activities. Licensee and Scripps
acknowledge and agree that their respective rights and obligations pursuant to
this Agreement shall be subject to Scripps' obligations and the rights of the
United States Government, if any, which arise or result from Scripps' receipt of
research support from the United States Government, including without
limitation, the grant by Scripps to the United States a non-exclusive,
irrevocable, royalty-free license to Scripps Technology and Scripps Patent
Rights licensed hereunder for governmental purposes.

      6.4 Reservation of Rights. Scripps reserves the right to use for any
non-commercial research purposes and the right to allow other nonprofit
institutions to use for any non-commercial research purposes any Scripps
Technology and Scripps Patent Rights licensed hereunder, without Scripps or such
other institutions being obligated to pay Licensee any royalties or other
compensation.

7. Confidentiality and Publication.

      7.1 Treatment of Confidential Information. The parties agree that during
the term of this Agreement and for ten ( 10) years thereafter, a party receiving
Confidential Information of the other party will (i) maintain in confidence such
Confidential Information to the same extent such party maintains its own
proprietary industrial information, (ii) not disclose such Confidential
Information to any third party without prior written consent of the other party
and (iii) not use such Confidential Information for any purpose except those
permitted by this Agreement.

      7.2 Permitted Usage. Notwithstanding the provisions of Section 7.1 above,
the receiving party may use or disclose Confidential Information of the
disclosing party to the extent necessary to exercise its rights hereunder
(including commercialization and/or sublicensing of Scripps Patent Rights and
Scripps Technology) or fulfill its obligations and/or duties hereunder and in
filing for, prosecuting or maintaining any proprietary rights, prosecuting or
defending litigation, complying with applicable governmental regulations and/or
submitting information to tax or other governmental authorities; provided that
if the receiving party is required by law to make any public disclosures of
Confidential Information of the disclosing party, to the extent it may legally
do so, it will give reasonable advance notice to the disclosing party of such
disclosure and will use its reasonable efforts to secure confidential treatment
of Confidential Information prior to its disclosure (whether through protective
orders or otherwise).

<PAGE>

      7.3 Publications. Licensee agrees that Scripps shall have a right to
publish in accordance with its general policies and subject to Section 6.2 of
the Research Agreement.

      7.4 Publicity. Except as otherwise provided herein or required by law, no
party shall originate any publication, news release or other public
announcement, written or oral, whether in the public press, stockholders'
reports, or otherwise, relating to this Agreement or to any sublicense
hereunder, or to the performance hereunder or any such agreements, without the
prior written approval of the other party, which approval shall not be
unreasonably withheld. Scientific publications published in accordance with
Section 7.3 of this Agreement shall not be construed as publicity governed by
this Section 7.4.

8. Term and Termination.

      8.1 Term. Unless terminated sooner in accordance with the terms set forth
herein, this Agreement, and the license granted hereunder, shall terminate as
provided in Section 2.7 hereof.

      8.2 Termination Upon Default. Any one or more of the following events
shall constitute an event of default hereunder: (i) the failure of a party to
pay any amounts when due hereunder and the expiration of thirty (30) days after
receipt of a written notice requesting the payment of such amount; (ii) the
failure of a party to perform any material obligation required of its to be
performed hereunder, and the failure to cure within sixty (60) days after
receipt of notice from the other party specifying in reasonable detail the
nature of such default. Upon the occurrence of any event of default, the
non-defaulting party may deliver to the defaulting party written notice of
intent to terminate, such termination to be effective upon the date set forth in
such notice.

      Such termination rights shall be in addition to and not in substitution
for any other remedies that may be available to the non-defaulting party.
Termination pursuant to this Section 8.2 shall not relieve the defaulting party
from liability and damages to the other party for breach of this Agreement.
Waiver by either party of a single default or a succession of defaults shall not
deprive such party of any right to terminate this Agreement arising by reason of
any subsequent default.

      Notwithstanding the foregoing provisions of this Section 8.2, if the party
alleged to be in default of this Agreement disputes in good faith such default
within the applicable cure period, the other party's right to terminate shall be
stayed until it has been determined in accordance with Section 10.2 below of
this Agreement that the party alleged to be in default was actually in default
and such defaulting party fails to comply with its obligations hereunder within
the applicable cure period.

      8.3 Termination Upon Bankruptcy or Insolvency. This Agreement may be
terminated by Scripps giving written notice of termination to Licensee upon the
filing of 

<PAGE>

bankruptcy or bankruptcy of Licensee or the appointment of a receiver of any of
Licensee's assets, or the making by Licensee of any assignment for the benefit
of creditors, or the institution of any proceedings against Licensee under any
bankruptcy law which proceeding is not dismissed with prejudice within ninety
(90) days from its initiation. Termination shall be effective upon the date
specified in such notice.

      8.4 Termination by Licensee. Any provision herein notwithstanding,
Licensee may terminate this Agreement, in its entirety or as to any particular
patent or patent application within the Scripps Patent Rights, or as to any
particular Licensed Product, at any time by giving Scripps at least ninety (90)
days prior written notice. From and after the effective date of a termination
under this Section 8.4 with respect to a particular patent or application, such
patent(s) and patent application(s) in the particular country shall cease to be
within the Scripps Patent Rights for all purposes of this Agreement, and all
rights and obligations of Licensee with respect to such patent(s) and patent
application(s) shall terminate. From and after the effective date of a
termination under this Section 8.3 with respect to a particular Licensed
Product, the license granted under Section 2.1 above shall terminate with
respect to such Licensed Product, and the same shall cease to be a Licensed
Product for all purposes of this Agreement. Upon a termination of this Agreement
in its entirety under this Section 8.4, all rights and obligations of the
parties shall terminate, except as provided in Section 8.5 below.

      8.5 Rights Upon Expiration. Neither party shall have any further rights or
obligations upon the expiration of this Agreement upon its regularly scheduled
expiration date with respect to this Agreement, other than the obligation of
Licensee to make any and all reports and payments for the final quarter period.
Provided, however, that upon such expiration, each party shall be required to
continue to abide by its non-use and non-disclosure obligations as described in
Section 7.1, and Licensee shall continue to maintain records under Section 2.10
and abide by its obligation to indemnify Scripps as described in Section 4.3 and
by its obligations under Section 6.2 hereof.

      8.6 Rights Upon Termination.

            8.6.1 Accrued Obligations. Termination of this Agreement for any
reason shall not release either party hereto from any liability which at the
time of such termination has already accrued to the other party.

            8.6.2 Inventory. In the event this Agreement is terminated for any
reason, Licensee shall provide Scripps with a written inventory of all Licensed
Products that Licensee and its Affiliates have in process of manufacture, in use
or in stock and Licensee and its Affiliates shall have the right to sell or
otherwise dispose of such Licensed Products for a period not to exceed six (6)
months from the effective date of such termination, all subject to the payment
to Scripps royalties and provision of reports pursuant to this Agreement.

            8.6.3 Sublicenses. Upon termination of this Agreement by Scripps for
any reason, any sublicense granted by Licensee hereunder shall survive, provided
that 

<PAGE>

upon request by Scripps, such Sublicensee promptly agrees in writing to be bound
by the applicable terms of this Agreement.

            8.6.4 Survival. Sections 2.10, 4.3, 6.2, 7.1 and 10 shall survive
any termination of this Agreement. Except as otherwise provided in this Section
8, all rights and obligations of the parties under this Agreement shall
terminate upon termination of this Agreement.

<PAGE>

9. Assignment; Successors.

      9.1 Assignment. Neither this Agreement nor any rights granted hereunder
may be assigned or transferred by Licensee except (i) to an Affiliate of
Licensee or (ii) to a successor in interest to all or substantially all of the
business assets of Licensee, whether by way of a merger, consolidation, sale of
all or substantially all of Licensee's assets, change of control or similar
transaction, without the prior written consent of Scripps.

      9.2 Binding Upon Successors and Assigns. Subject to the limitations on
assignment herein, this Agreement shall be binding upon and inure to the benefit
of any successors in interest and assigns of Scripps and Licensee. Any such
successor or assignee of Licensee's interest shall expressly assume in writing
the performance of all the terms and conditions of this Agreement to be
performed by Licensee.

10. General Provisions.

      10.1 Independent Contractors. The relationship between Scripps and
Licensee is that of independent contractors. Scripps and Licensee are not joint
venturers, partners, principal and agent, master and servant, employer or
employee, and have no other relationship other than independent contracting
parties. Scripps and Licensee shall have no power to bind or obligate each other
in any manner, other than as is expressly set forth in this Agreement.

      10.2 Arbitration. Any controversy or claim arising out of or relating to
this Agreement, or the breach thereof, shall be settled by binding arbitration
in accordance with the Commercial Arbitration Rules of the American Arbitration
Association ("AAA"), and the procedures set forth below. In the event of any
inconsistency between the Rules of AAA and the procedures set forth below, the
procedures set forth below shall control. Judgment upon the award rendered by
the arbitrators may be enforced in any court having jurisdiction thereof.

            10.2.1 Location. The location of the arbitration shall be in the
County of San Diego in the State of California.

            10.2.2 Selection of Arbitrators. The arbitration shall be conducted
by a panel of three neutral arbitrators who are independent and disinterested
with respect to the parties, this Agreement, and the outcome of the arbitration.
Each party shall appoint one neutral arbitrator, and these two arbitrators so
selected by the parties shall then select the third arbitrator. If one party has
given written notice to the other party as to the identity of the arbitrator
appointed by the party, and the party thereafter makes a written demand on the
other party to appoint its designated arbitrator within the next ten days, and
the other party fails to appoint its designated arbitrator within ten days after
receiving said written demand, then the arbitrator who has already been
designated shall appoint the other two arbitrators.

<PAGE>

            10.2.3 Discovery. Unless the parties mutually agree in writing to
some additional and specific pre-hearing discovery, the only pre-hearing
discovery shall be (a) reasonably limited production of relevant and
non-privileged documents, and (b) the identification of witnesses to be called
at the hearing, which identification shall give the witness's name, general
qualifications and position, and a brief statement as to the general scope of
the testimony to be given by the witness. The arbitrators shall decide any
disputes and shall control the process concerning these pre-hearing discovery
matters. Pursuant to the Rules of AAA, the parties may subpoena witnesses and
documents for presentation at the hearing.

            10.2.4 Case Management. Prompt resolution of any dispute is
important to both parties; and the parties agree that the arbitration of any
dispute shall be conducted expeditiously. The arbitrators are instructed and
directed to assume case management initiative and control over the arbitration
process (including scheduling of events, pre-hearing discovery and activities,
and the conduct of the hearing), in order to complete the arbitration as
expeditiously as is reasonably practical for obtaining a just resolution of the
dispute.

            10.2.5 Remedies. The arbitrators may grant any legal or equitable
remedy or relief that the arbitrators deem just and equitable, to the same
extent that remedies or relief could be granted by a state or federal court,
provided however, that no punitive damages may be awarded. No court action may
be maintained seeking punitive damages. The decision of any two of the three
arbitrators appointed shall be binding upon the parties.

            10.2.6 Expenses. The expenses of the arbitration, including the
arbitrators' fees, expert witness fees, and attorney's fees, may be awarded to
the prevailing party, in the discretion of the arbitrators, or may be
apportioned between the parties in any manner deemed appropriate by the
arbitrators. Unless and until the arbitrators decide that one party is to pay
for all (or a share) of such expenses, both parties shall share equally in the
payment of the arbitrators' fees as and when billed by the arbitrators.

            10.2.7 Confidentiality. Except as set forth below, the parties shall
keep confidential the fact of the arbitration, the dispute being arbitrated, and
the decision of the arbitrators. Notwithstanding the foregoing, the parties may
disclose information about the arbitration to persons who have a need to know,
such as directors, trustees, management employees, witnesses, experts,
investors, attorneys, lenders, insurers, and others who may be directly
affected. Additionally, if a party has stock which is publicly traded, the party
may make such disclosures as are required by applicable securities laws.
Further, if a party is expressly asked by a third party about the dispute or the
arbitration, the party may disclose and acknowledge in general and limited terms
that there is a dispute with the other party which is being (or has been)
arbitrated. Once the arbitration award has become final, if the arbitration
award is not promptly satisfied, then these confidentiality provisions shall no
longer be applicable.

<PAGE>

      10.3 Entire Agreement Modification. This Agreement sets forth the entire
agreement and understanding between the parties as to the subject matter hereof.
There shall be no amendments or modifications to this Agreement, except by a
written document which is signed by both parties. It is understood that the
Research Agreement is separate and independent from this Agreement and
termination of either agreement shall not operate to terminate or otherwise
effect the rights and obligations of the parties under the other agreement.

      10.4 California Law. This Agreement shall be construed and enforced in
accordance with the laws of the State of California.

      10. 5 Limitation of Liability. NEITHER PARTY SHALL BE LIABLE TO THE OTHER
PARTY OR ANY THIRD PARTY FOR ANY SPECIAL, CONSEQUENTIAL, EXEMPLARY OR INCIDENTAL
DAMAGES (INCLUDING LOST OR ANTICIPATED REVENUES OR PROFITS RELATING TO THE
SAME), ARISING FROM ANY CLAIM RELATING TO THIS AGREEMENT, WHETHER SUCH CLAIM IS
BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE) OR OTHERWISE, EVEN IF AN
AUTHORIZED REPRESENTATIVE OF SUCH PARTY IS ADVISED OF THE POSSIBILITY OR
LIKELIHOOD OF SAME.

      10.6 No Implied Obligations. Licensee's sole obligation to exploit the
Scripps Patent Rights and Scripps Technology is as set forth in Section 4.1.
Nothing in this Agreement shall be deemed to require Licensee to otherwise
exploit the Scripps Patent Rights or Scripps Technology nor prevent Licensee
from commercializing products similar to or competitive with a Licensed Product.

      10.7 Headings. The headings for each article and section in this Agreement
have been inserted for convenience of reference only and are not intended to
limit or expand on the meaning of the language contained in the particular
article or section.

      10.8 Severability. Should any one or more of the provisions of this
Agreement be held invalid or unenforceable by a court of competent jurisdiction,
it shall be considered severed from this Agreement and shall not serve to
invalidate the remaining provisions thereof. The parties shall make a good faith
effort to replace any invalid or unenforceable provision with a valid and
enforceable one such that the objectives contemplated by them when entering this
Agreement may be realized.

      10.9 No Waiver. Any delay in enforcing a party's rights under this
Agreement or any waiver as to a particular default or other matter shall not
constitute a waiver of such party's rights to the future enforcement of its
rights under this Agreement, excepting only as to an express written and signed
waiver as to a particular matter for a particular period of time.

<PAGE>

      10.10 Name. Whenever there has been an assignment by Licensee as permitted
by this Agreement, the term "Licensee" as used in this Agreement shall also
include and refer to, if appropriate, such assignee.

      10.11 Notices. Any notices required by this Agreement shall be in writing,
shall specifically refer to this Agreement and shall be sent by registered or
certified airmail, postage prepaid, or by telefax, telex or cable, charges
prepaid, or by overnight courier, postage prepaid and shall be forwarded to the
respective addresses set forth below unless subsequently changed by written
notice to the other party:

      For Scripps       The Scripps Research Institute
                        10550 North Torrey Pines Road, TPC-9
                        La Jolla, California 92037
                        Attn: Director, Technology Development
                        Fax No.: (619) 784-9910

      For Licensee:     StemCells, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: Research Director
                        Fax No.: (401) 333-0684

      with a copy to:   CytoTherapeutics, Inc.
                        701 George Washington Highway
                        Lincoln, Rhode Island 02865
                        Attn: General Counsel
                        Fax No.: (401) 334-9152

Notice shall be deemed delivered upon the earlier of (i) when received, (ii)
three (3) days after deposit into the mail, or (iii) the date notice is sent via
telefax, telex or cable, (iv) the day immediately following delivery to
overnight courier (except Sunday and holidays).

<PAGE>

      10.12 Compliance with U. S. Laws. Nothing contained in this Agreement
shall require or permit Scripps or Licensee to do any act inconsistent with the
requirements of any United States law, regulation or executive order as the same
may be in effect from time to time.

      IN WITNESS WHEREOF, the parties have executed this Agreement by their duly
authorized representatives as of the date set forth above.


SCRIPPS:                                  LICENSEE:


THE SCRIPPS RESEARCH INSTITUTE            STEMCELLS, INC.


By:                                       By:     
   ------------------------------            ------------------------------

Name:                                     Philip K. Yachmetz
     ----------------------------                                          

Title:                                    Senior Vice President
      ---------------------------           

<PAGE>

                                    EXHIBIT A

                            DISCLOSURE OF TECHNOLOGY

[*       ]



















* This confidential portion has been omitted and filed separately with the 
  Commission

<PAGE>

                                    EXHIBIT B

                              SCRIPPS PATENT RIGHTS

              [To be updated once patent applications are filed]

<PAGE>

                                                                   EXHIBIT 10.86

                                  EXHIBIT 10.86

                                    BILL YORK
                              EMPLOYMENT AGREEMENT

<PAGE>

                                                                   Exhibit 10.86

                             CYTOTHERAPEUTICS, INC.
                          701 George Washington Highway
                                Lincoln, RI 02865
                                  401-288-1000

                                 March 20, 1998

Billie M. York, Ph.D.
6532 Castle Pines Road
Fort Worth, TX  76132

Dear Bill:

      This letter will confirm our offer to you of employment with
CytoTherapeutics, Inc. (the "Company") under the terms and conditions that
follow:

      1. Position and Duties. As of the date of this letter, you will become an
employee of the Company, available to answer questions and provide advice to the
Company from your current location or while traveling, as your current schedule
permits. As of April 20, 1998, (the "Full-Time Date"), you will be employed by
the Company hereunder on a full-time basis as Executive Vice President. As
Executive Vice President, you will exert your full-time best efforts to promote
and protect the business interests of the Company. Your initial responsibility
will be to oversee the Company's efforts to apply our encapsulated cell and stem
cell technologies toward possible development of treatments for certain diseases
and disorders of the eye and ear. If the Company determines to conduct such
efforts through a subsidiary, you shall serve as chief executive officer of such
subsidiary. More generally, you shall fulfill such responsibilities as the
Company may reasonably determine consistent with your position as an Executive
Vice President. You will report directly to the Company's Chief Executive
Officer.

      2. Salary and Bonus. For all services that you perform for the Company and
its Affiliates (as defined in Section 6(g)(ii)), the Company will compensate you
during your employment in accordance with this Paragraph 2. For the period
between now and the Full-Time Date, you will be paid Two Thousand Dollars
($2,000). Thereafter, your base salary will be at the rate of Two Hundred Thirty
Thousand Dollars ($230,000) per year. Your performance and compensation will be
reviewed at least annually by the Chief Executive Officer and the Compensation
Committee of the Board. In addition to your base salary, you will be eligible,
at the end of each calendar year, beginning with calendar 1998, during your
employment hereunder, for a bonus of up to twenty percent (20%) of your base
salary, the amount of each such bonus being determined by the Board in its
discretion on the basis of

<PAGE>

your performance hereunder or (if mutually agreed) on the basis of the
attainment of specific performance objectives, provided, however, that the
Company hereby agrees that, with respect to calendar year 1998, you shall
receive the full amount of such bonus ($46,000).

      3. Stock Options. Through the Company's 1992 Equity Incentive Plan (the
"Incentive Plan"), and subject to the terms and conditions of such Plan, you are
hereby granted, as of the date of this letter, an option to acquire 150,000
shares of the common stock of the Company at the fair market value of such
shares on the date of this letter, as determined by the Board. Subject to your
continued employment by the Company, the Time-Based Option will vest as follows:
(i) 37,500 of the shares will vest on the Full-Time Date and (ii) the remaining
112,500 shares shall vest at the rate of 2,344 shares per month (2,332 shares in
the final month) on the last day of each month during the ensuing forty-eight
months. Except as otherwise expressly provided herein, the Time-Based Option
shall be governed by the terms of the Incentive Plan, as in effect from time to
time.

      4. Relocation and Relocation Allowance. Promptly following the Full-Time
Date, you will establish your principal office at the Company's offices in Rhode
Island and a temporary residence for yourself within driving distance of such
office. When the Company has determined the principal location for the
activities you will be managing, you will relocate permanently to such location.
The Company will cover all reasonable costs of your temporary housing and
related expenses for so long as such principal location is undefined and shall
pay you $50,000 for your permanent relocation at the time of such relocation.

      5. Benefits. Commencing as of the Full-Time Date, you will be entitled to
participate in any and all employee benefit plans from time to time in effect
for senior management of the Company generally, except to the extent that such
plans are duplicative of benefits otherwise provided to you under this
Agreement. Such participation shall be subject to (i) the terms of the
applicable plan documents, (ii) generally applicable policies of the Company and
(iii) the discretion of the Board and plan administrators, as provided for in or
contemplated by such plan. The Company will provide you with a leased automobile
and cover the cost of professional memberships to the extent consistent with
Company policy for its senior executives. Prior to your permanent relocation to
within driving distance of the Company's principal offices, the Company will
reimburse you for the cost of one round trip per month to Texas. The Company
expects that these trips will, to the extent possible, be scheduled to coincide
with Company business. The Company will provide you with four weeks vacation per
year. The Company shall reimburse you for all expenses reasonably incurred by
you in connection with your performance of your duties hereunder on a basis
consistent with Company policies.

      6. Confidentiality and Restricted Activities. You agree that some
restrictions on your activities during and after employment are necessary to
protect the goodwill, Confidential Information and other legitimate interests of
the Company:

            a. During your employment and for 10 years thereafter, except as
required by applicable law or for the proper performance of your duties and
responsibilities to the 

<PAGE>

Company, you shall not use or disclose to any Person any Confidential
Information, as defined below. This restriction shall continue to apply for 10
years after your employment terminates, regardless of the reason for such
termination.

            b. While you are employed by the Company and for a period of one (1)
year thereafter, you will not, directly or indirectly, engage in any activity,
whether as owner, partner, investor, consultant, employee, agent or otherwise,
that is competitive with the business of the Company or its Affiliates,
provided, however, that nothing contained in this paragraph shall prohibit you
from owning up no more than one percent (1%) of the outstanding stock of any
publicly traded company.

            c. While you are employed by the Company and for a period of one (1)
year thereafter, you will not, directly or indirectly, hire or attempt to hire
any employee of the Company or its Affiliates, assist in such hiring by any
Person or otherwise solicit, induce or encourage any employee of the Company or
any of its Affiliates to terminate his or her relationship with them.

            d. You agree that you will not, during your employment with the
Company, improperly use or disclose any proprietary information or trade secrets
of any former or concurrent employer or other Person with whom you have an
agreement or duty to keep in confidence information acquired by you in
confidence, if any. You also agree that you will not bring onto Company premises
any unpublished document or proprietary information belonging to any such
employer or other Person, unless consented to in writing by such employer or
other Person.

            e. All documents, records, tapes, software and other media of every
kind and description relating to the business, present or otherwise, of the
Company and its Affiliates and any copies, in whole or in part, thereof (the
"Documents"), whether or not prepared by you, shall be the sole and exclusive
property of the Company and its Affiliates. You agree to safeguard all Documents
and to surrender to the Company at the time your employment terminates, or at
such earlier time or times as the Board may specify, all Documents and other
property of the Company and its Affiliates (including without limitation,
devices and equipment) then in your possession or control.

            f. You agree that the Company shall, in addition to any other
remedies available to it, be entitled to preliminary and permanent injunctive
relief against any breach by you of the covenants contained in this Paragraph 6,
without having to post bond. In the event that any provision of this Paragraph 6
shall be determined by a court of competent jurisdiction to be unenforceable by
reason of its being extended over too great a time, too large a geographic area
or too great a range of activities, it shall be interpreted to extend only over
the maximum period of time, geographic area or range of activities as to which
it may be enforceable.

            g. For purposes of this Agreement:

<PAGE>

                  i. A business shall be deemed to be competitive with the
Company or its Affiliates if it engages or proposes to engage in any business
activity which is (A) utilizing or seeking to develop technology capable of
utilizing the transplantation of cells as a therapeutic agent for the diagnosis,
prevention or treatment of human disease, injury or condition or (B) in any
field the Company or any of its Affiliates is then pursuing or then has in
contemplation or planning.

                  ii. "Affiliates" means all persons and entities directly or
indirectly controlling, controlled by or under common control with the Company,
where control may be by management authority, equity interest or otherwise.

                  iii. "Confidential Information" means any and all information
of the Company and its Affiliates that is not generally known by others with
whom they compete or do business or with whom they plan to compete or do
business and any and all information, publicly known in whole or in part or not,
which, if disclosed by the Company or its Affiliates, would assist in
competition against them. Confidential Information includes without limitation
such information relating to (i) the development, research, testing, production
and marketing activities of the Company and its Affiliates, (ii) the products
and services of the Company and its Affiliates, (iii) their patents, trade
secrets, licenses and intellectual property, patients and clinical trials; (iv)
the costs, sources of supply, financial performance and strategic plans of the
Company and its Affiliates, (v) the identity and special needs of the customers
of the Company and its Affiliates and (vi) the people and organizations with
whom the Company and its Affiliates have business relationships and those
relationships. Confidential Information also includes information that the
Company or any of its Affiliates has received belonging to others with any
understanding, express or implied, that it would not be disclosed. Confidential
Information does not include, however, information that has become publicly
known and generally available other than through a wrongful act by you.

                  iv. "Person" means an individual, a corporation, an
association, a partnership, an estate, a trust and any other entity or
organization, other than the Company or any of its Affiliates.

<PAGE>

      7. Inventions.

            a. You hereby represent to the Company and agree that, except as
described in Schedule A hereof, you have no invention, original work of
authorship, development, improvement or trade secret that was made by you prior
to your employment with the Company and which relates to the Company's current
or proposed business, products or research and development.

            b. You will promptly make full written disclosure to the Company,
hold in trust for the Company's sole right and benefit and hereby assign and
agree to assign to the Company or its designee all of your right, title and
interest in any and all Inventions. As used in this Agreement, "Inventions"
means inventions, discoveries, developments, methods, processes, compositions,
works, concepts and ideas (whether or not patentable or copyrightable or
constituting trade secrets) conceived, made, created, developed or reduced to
practice by you (whether alone or with others and whether or not during normal
business hours or on or off Company premises) during your employment that relate
in any way to the business, products or services of the Company or any of its
Affiliates or to any prospective activity of the Company or any of its
Affiliates or for which the Confidential Information or the Company's facilities
have been utilized. You further acknowledge and agree that all original works of
authorship made by you solely or jointly with others within the scope of your
employment and eligible for protection by copyright are "works made for hire,"
as that term is defined in the United States Copyright Act. You agree to keep
and maintain adequate and current records of all Inventions made by you solely
or jointly with others during your employment with the Company. Such records
will be in the form of notes, sketches, drawings or any other format that may be
specified by the Company These records will be available to, and remain the sole
property of, the Company at all times. You agree to assist the Company or its
designee, at the Company's expense, in every proper way, to secure the Company's
rights in the Inventions and copyrights, including without limitation disclosure
to the Company of all pertinent information and data with respect thereto, the
execution of all applications, specifications, oaths, assignments and all other
instruments that the Company shall deem necessary or desirable in order to apply
for and obtain such rights, and in order to assign and convey to the Company,
its successors, designees and nominees the sole and exclusive right, title and
interest in and to such Inventions, and any copyrights, patents, or other
intellectual property rights relating thereto, both during your employment by
the Company and thereafter. In the event that the Company is unable for any
reason to secure or to prosecute any patent application with respect to any of
such Inventions (including without limitation, renewals, extensions,
continuations, divisions or continuations in part thereof), you hereby
irrevocably designate and appoint the Company and its duly authorized officers
and agents as your agents and attorney-in-fact to act for and in your behalf and
instead of you, to execute and file any such application and to do all other
lawfully permitted acts to further the prosecution and issuance of patents
thereof with the same legal force and effect as if executed by you. You agree
that you will assist the Company in the prosecution and enforcement of the
Company's rights to the Inventions and copyrightable materials after termination
of your employment, at the Company's expense.

<PAGE>

      8. Termination and Termination Benefits. Your employment with the Company
is "at will," which means that either you or the Company may terminate your
employment at any time, with or without cause or good reason.

            a. The Company may terminate your employment other than for "cause"
at any time upon written notice to you and, in that event, the Company will pay
you a lump sum amount equal to one year's base salary (determined by reference
to your base salary as in effect at the time of such termination), such lump sum
amount to be payable within 30 days of such notice of termination.

            b. The Company may terminate your employment upon written notice to
you in the event that you become disabled during your employment through any
illness, injury, accident or condition of either physical or psychological
nature and, as a result, you are unable to perform substantially all of your
duties and responsibilities hereunder for ninety (90) days during any three
hundred and sixty-five (365) calendar days. In that event, the Company will
continue to pay you your base salary (i) for a period of six (6) months
following such termination or (ii) until you obtain other employment or (iii)
until you become eligible for disability income under any disability income plan
provided by the Company, whichever of these events shall first occur.

            c. The Company may terminate your employment hereunder for cause at
any time upon written notice to you setting forth in reasonable detail the
nature of such cause. The following, as determined by the Company in its
reasonable judgment, shall constitute "cause" for termination: (i) your willful
failure to perform your material duties and responsibilities to the Company and
its Affiliates (including, without limitation, those duties and responsibilities
described in Section 1); (ii) your material breach of Paragraph 6 or Paragraph 7
of this Agreement; (iii) fraud, embezzlement or other material dishonesty with
respect to the Company or any of its Affiliates; or (iv) your conviction of, or
plea of nolo contendere to, a felony.

            d. You may terminate your employment at any time, with or without
good reason, upon written notice to the Company. If you decide to terminate your
employment without good reason, you agree to give the Company three months'
notice of termination. You may terminate your employment hereunder with good
reason at any time upon written notice to the Company. The following shall
constitute "good reason" for termination: material breach by the Company of any
provision of this Agreement, which breach continues for more than thirty (30)
business days following receipt by the Company of written notice from you
setting forth in reasonable detail the nature of such breach. If you terminate
your employment with good reason, the Company will be obligated to you under
Paragraph 8.a hereof as if the Company had terminated your employment other than
for cause.

            e. If you resign without good reason or your employment is
terminated by the Company for cause, the Company shall have no further
obligation to you other than for base

<PAGE>

salary earned through the date of termination. No severance pay or other
benefits of any kind will be provided.

      9. Withholding. All payments and reimbursements made by the Company under
this Agreement shall be reduced by any tax or other amounts required to be
withheld by the Company under applicable law.

      10. Assignment. Neither you nor the Company may make any assignment of
this Agreement or any interest herein, by operation of law or otherwise, without
the prior written consent of the other; provided, however, that the Company may
assign its rights and obligations under this Agreement without your consent to
one of its Affiliates or to any Person with whom the Company shall hereafter
affect a reorganization, consolidation or merger or to whom the Company
transfers all or substantially all of its properties or assets. This Agreement
shall inure to the benefit of and be binding upon you and the Company and each
of your respective successors, executors, administrators, heirs and permitted
assigns.

      11. Waiver. Except as otherwise expressly provided in this Agreement, no
waiver of any provision hereof shall be effective unless made in writing and
signed by the waiving party. The failure of either party to require performance
of any term or obligation of this Agreement, or the waiver by either party of
any breach of this Agreement, shall not prevent any subsequent enforcement of
such term or obligation or be deemed a waiver of any subsequent breach.

      12. Severability. If any portion or provision of this Agreement shall to
any extent be declared illegal or unenforceable by a court of competent
jurisdiction, then the remainder of this Agreement, or the application of such
portion or provision in circumstances other than those as to which it is so
declared illegal or unenforceable, shall not be affected thereby, and each
portion and provision of this Agreement shall be valid and enforceable to the
fullest extent permitted by law.

      13. Notices. Except as otherwise expressly provided herein, any notices,
requests, demands and other communications provided for by this Agreement shall
be in writing and shall be effective when delivered in person or deposited in
the United States mail, postage prepaid, registered or certified, and addressed
to you at your last known address on the books of the Company or, in the case of
the Company, at its main office, attention of the Chairman of the Board.

      14. Captions. The captions and headings in this Agreement are for
convenience only and in no way define or describe the scope or content of any
provision of this Agreement.

      15. Entire Agreement. This Agreement sets forth the entire agreement and
understanding between you and the Company and supersedes all prior
communications, agreements and understandings, written and oral, with respect to
the terms and conditions of 

<PAGE>

your employment. This Agreement may not be amended or modified, except by an
agreement in writing signed by you and the Chairman of the Board or other
specifically authorized representative of the Company.

      16. Governing Law. This Agreement shall be governed, construed and
enforced in accordance with the laws of Rhode Island, without regard to the
conflict of laws principles thereof.

      17. No Conflicting Agreements. You hereby represent to the Company that
neither your execution and delivery of this Agreement nor your acceptance of
employment with the Company nor your performance under this Agreement will
conflict with or result in a breach of any of the terms, conditions or
provisions of any agreement to which you are a party or are bound or any order,
injunction, judgment or decrees of any court or governmental authority or any
arbitration award applicable to you.

      18. Compliance with Agreement. The Company's obligations under this
Agreement and its obligation to deliver stock under the terms of the stock
options granted pursuant to the terms of this Agreement (or otherwise granted
you during the course of your employment) are conditioned on your compliance
with the terms and conditions of this Agreement and the accuracy of the
representations made to the Company by you herein.

<PAGE>

      If the foregoing is acceptable to you, please sign the enclosed copy of
this letter in the space provided below and return it to me, whereupon this
letter and such copy will constitute a binding agreement between you and the
Company on the basis set forth above as of the date first above written.

                                Sincerely yours,
                                CYTOTHERAPEUTICS, INC.


                                By:

                                    Richard M. Rose, M.D.
                                    Chairman
Accepted and agreed:


Billie M. York, Ph.D.

Date:  
     --------------------

<PAGE>

                                                                      Schedule A

                                Prior Inventions

      [See attached list]

<PAGE>

                                                                   Exhibit 21


                    SUBSIDIARIES OF CYTOTHERAPEUTICS, INC.


<TABLE>
<CAPTION>
Name                                   Jurisdiction of Incorporation
- ----                                   -----------------------------
<S>                                    <C>
StemCells, Inc.                        California
</TABLE>








<PAGE>




                                                            Exhibit 23.1



                       Consent of Independent Auditors

We consent to the incorporation by reference in the Registration Statement 
(Form S-8 No. 33-49524 and 333-29335) pertaining to the 1998 Incentive Stock 
Plan, 1992 Equity Incentive Plan, 1992 Employee Stock Purchase Plan and 1992 
Stock Option Plan for Non-Employee Directors, in the Registration Statement 
(Form S-8 No. 333-10773) pertaining to the 1992 Equity Incentive Plan, in the 
Registration Statement (Form S-8 No. 333-37313) pertaining to the 1996 
StemCells, Inc. Stock Option Plan and the 1997 CytoTherapeutics, Inc. 
StemCells Research Stock Option Plan and in the Registration Statements 
(Form S-3 No. 33-68900 and No. 333-91228) of CytoTherapeutics, Inc. and in the
related Prospectuses of our report dated February 12, 1999, with respect to 
the consolidated financial statements and schedule included in the Annual 
Report (Form 10-K) of CytoTherapeutics, Inc. for the year ended December 31, 
1998.

                                                              Ernst & Young LLP


Boston, Massachusetts
March 29, 1999


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                       7,864,788
<SECURITIES>                                 9,520,939
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            18,434,010
<PP&E>                                      16,422,159
<DEPRECIATION>                             (8,066,150)
<TOTAL-ASSETS>                              32,865,082
<CURRENT-LIABILITIES>                        5,547,824
<BONDS>                                      3,761,667
                                0
                                          0
<COMMON>                                       178,003
<OTHER-SE>                                  17,719,405
<TOTAL-LIABILITY-AND-EQUITY>                32,865,682
<SALES>                                              0
<TOTAL-REVENUES>                             8,803,163
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                            22,261,288
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             472,400
<INCOME-PRETAX>                           (12,627,830)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (12,627,830)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (12,637,830)
<EPS-PRIMARY>                                    (.69)
<EPS-DILUTED>                                    (.69)
        

</TABLE>

<PAGE>


                                   EXHIBIT 99



           CAUTIONARY FACTORS RELEVANT TO FORWARD-LOOKING INFORMATION

         CYTOTHERAPEUTICS, INC. (THE "COMPANY") WISHES TO CAUTION READERS 
THAT THE FOLLOWING IMPORTANT FACTORS, AMONG OTHERS, IN SOME CASES HAVE 
AFFECTED AND IN THE FUTURE COULD AFFECT THE COMPANY'S RESULTS AND COULD CAUSE 
ACTUAL RESULTS AND THE NEEDS AND FINANCIAL CONDITION OF THE COMPANY TO VARY 
MATERIALLY FROM FORWARD-LOOKING STATEMENTS MADE BY THE COMPANY ON THE BASIS 
OF MANAGEMENT'S CURRENT EXPECTATIONS. THE BUSINESS IN WHICH THE COMPANY IS 
ENGAGED IS DEPENDENT ON UNPROVEN TECHNOLOGY, RAPIDLY CHANGING, EXTREMELY 
COMPETITIVE AND INVOLVES A HIGH DEGREE OF RISK, AND ACCURACY WITH RESPECT TO 
FORWARD-LOOKING STATEMENTS IS DIFFICULT.

         DEPENDENCE ON ASTRA AND RESULTS OF PHASE IIB CLINICAL TRIAL. The 
Company's ability to continue development of its encapsulated-cell therapy 
products is dependent on the willingness of Astra AB to continue to support 
further development of the Company's encapsulated-cell product for the 
treatment of chronic pain. While Astra increased its support for this program 
during 1998 and the first half of 1999 in order to facilitate completion of 
the Phase IIB clinical trial for this product, Astra has the right to 
terminate the agreement providing for its support for this product at any 
time. The Company expects that the results from the Phase IIB clinical trial 
for this product will be available about mid-1999. The Company expects Astra 
to make a decision on continued support for the Company's chronic pain 
program based in substantial part on Astra's review of the results of this 
trial. Should Astra determine to terminate the program or seek to reduce its 
support for the program or to otherwise adversely modify the terms of the 
Company's relationship with Astra, any such action would have a material, 
adverse effect on the Company's liquidity and capital resources and would 
likely result in the Company's inability to continue to fund further 
development of its proposed encapsulated-cell products.

         NEED TO OBTAIN CORPORATE PARTNER OR PARTNERS TO SUPPORT STEM CELL 
DEVELOPMENT EFFORTS. The Company's ability to continue to fund the 
development of its neural and other stem cell technologies will be dependent 
on the Company's ability to reach appropriate partnering arrangements 
providing support for the Company's discovery and development efforts. While 
the Company has engaged, and expects to continue to engage, in discussions 
regarding such arrangements, the Company has not reached any agreement 
regarding any such arrangements and there can be no assurance that the 
Company will be able to obtain any such agreement.

         LACK OF LIQUIDITY AND CAPITAL RESOURCES. The Company has limited 
liquidity and capital resources and must obtain significant additional 
capital resources in order to sustain its product development efforts. The 
Company's ability to obtain additional capital will be substantially 
dependent on Astra's decision regarding continuation of support for the 
Company's chronic pain product and the Company's ability to obtain partnering 
support for its stem cell technology. The Company's liquidity and capital 
resources will be adversely affected to the extent that the Company is 
required to redeem common stock of the Company held by Genentech, Inc. under 
the terms of the Company's partnering agreement with Genentech regarding 
possible development of an encapsulated-cell product for the treatment of 
Parkinson's disease, which was terminated by Genentech in May 1998. Under 
this agreement, if upon termination of the agreement the $8.3 million 
received by the Company from the sale of the Company's Common Stock to 
Genentech at the commencement of the agreement exceeds by more than $1 
million the funds expended by the Company in developing the proposed 
Parkinson's product, the Company is obligated to repurchase from Genentech 
for cash consideration shares of the Company's common stock having a value 
equal to the amount of the overfunding, at the same per share price 
originally paid by Genentech ($10.01 per share). Genentech has requested that 
the Company redeem shares of the Common Stock having an aggregate value of at 
least $3.1 million. The Company is negotiating with Genentech regarding the 
terms and amount of such redemption (which the Company currently expects may 
be approximately $3.1 million).

         EARLY STAGE DEVELOPMENT; HISTORY OF OPERATING LOSSES - Substantially
all of the Company's revenues to date have been derived, and for the foreseeable
future substantially all of the Company's revenues will be derived, from
collaborative agreements, research grants and income earned on invested funds.
The Company will incur substantial operating losses in the future as the Company
conducts its research, development, clinical trial and manufacturing activities.
There can be no assurance that the Company will achieve revenues from product
sales or become profitable.

         FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING - The
development of the Company's products will require the commitment of substantial
resources to conduct the time-consuming research, preclinical development and
clinical trials that are necessary for regulatory approvals and to establish
production and marketing capabilities, if such approvals are obtained. The
Company will need to raise substantial additional funds to continue its product
development efforts and intends to seek such additional funds through
partnership, collaborative or other arrangements with corporate sponsors, public
or private equity or debt financings, or from other sources. Future cash
requirements may vary from projections based on changes in the Company's
research and development programs, progress in preclinical and clinical testing,
the Company's ability to enter into, and perform successfully under,
collaborative agreements, competitive and technological advances, the need to
obtain proprietary rights owned by third parties, facilities requirements,
changes in regulations and other factors. Lack of necessary funds may require
the Company to delay, reduce or eliminate some or all of its research and
product development programs or to license its potential products or
technologies to third parties. No assurance can be given that funding will be
available when needed, if at all, or on terms acceptable to the Company.

         UNCERTAINTIES OF CLINICAL DEVELOPMENT AND NEW MODE OF THERAPY - None of
the Company's proposed products has been approved for commercial sale or entered
Phase III clinical trials. Even if the Company's proposed products appear to be
promising at an early stage of research or development such products may later
prove to be ineffective, have adverse side effects, fail to receive necessary
regulatory approvals, be difficult or uneconomical to manufacture or market on a
commercial scale, be adversely affected by government price controls or
limitations on reimbursement, be precluded from commercialization by proprietary
rights of third parties, by regulatory restrictions, or be subject to
significant competition from other products. There can be no assurance that the
Company will be able to demonstrate, as required, that its implants, on a
consistent basis and on a commercial scale, among other things: (i) successfully
isolate transplanted cells from the recipient's immune system; (ii) remain
biocompatible with the tissue into which they are implanted, including, for
certain implants, brain tissue; (iii) adequately maintain the viability of cells
contained within the membrane for a sufficiently long time to be efficacious and
commercially viable; (iv) safely permit the therapeutic substances produced by
the cells within the membrane to pass through the membrane unto the patient in
controlled doses for extended periods; and (v) are sufficiently durable for the
intended indication. While clinicians have generally had little difficulty in
retrieving the Company's implants, there have been cases where the implant broke
on attempted explant. The Company has changed its implantation procedure and its
implants and is continuing a program of developing stronger implants. In
addition, the viability of implanted

                                                                              39
<PAGE>

encapsulated cells varies depending of the cell type, the implantation location
and other factors. Lack of viability could restrict certain of the Company's
programs to indications where long-term delivery of the therapeutics substances
is not required. There can also be no assurance that the products that may be
generated in the Company's stem cell programs will: (i) survive and persist in
the desired locations, (ii) provide the therapeutic benefits intended, (iii)
properly differentiate and integrate into existing tissue in the desired manner,
or (iv) not cause tumors or other side effects.

         There has been increasing regulatory concern about the risks of cell 
transplantation. Certain of these concerns have focused on the use of cells 
derived from cows (such as are used in the Company's pain program) and cells 
from primates and pigs. The United Kingdom has adopted a moratorium on all 
xenotransplantation pending further research and discussion; the EC 
Commission has introduced a ban on the use of "high-risk material" from 
cattle and sheep in the Member States of the European Union in the 
manufacture of pharmaceuticals. In addition, the FDA has proposed guidelines 
that impose significant constraints on the conduct of clinical trials 
utilizing xenotransplantion and are likely to significantly affect the cost 
of producing the Company's products using non-human cells; such costs could 
make the Company's products cost more to produce than the Company receives 
for their production. Furthermore, the FDA has published a "Proposed Approach 
to Regulation of Cellular and Tissue-Based Products" which relates to the use 
of human cells. The Company cannot presently determine the effects of such 
actions or what other actions might be taken. Restrictions on the testing or 
use of cells, whether human or non-human, as human therapeutics, could 
adversely affect the Company's product development programs and the Company 
itself and could prevent the Company from producing and/or selling products 
or make the cost of production by the Company prohibitively high. See 
"Government Regulation."

         DEPENDENCE ON OUTSIDE PARTIES - The Company's strategy for the 
research, development, commercialization and marketing of its products 
contemplates that the Company will enter into various arrangements with 
corporate sponsors, pharmaceutical companies, universities, research groups 
and others. There is no assurance that the Company will be able to maintain 
its existing arrangements or to enter into any additional arrangements on 
terms acceptable to the Company, or successfully perform its obligations 
under its existing or any additional arrangements. If any of the Company's 
collaborators terminates its relationship with the Company or fails to 
perform its obligations in a timely manner, the development or 
commercialization of the Company's product candidate or research program 
under such collaborative agreement may be adversely affected. Moreover, as 
noted above, the Company is particularly dependent on its pain program 
partner, Astra AB.

         NEED FOR AND UNCERTAINTY OF OBTAINING PATENT PROTECTION - Patent 
protection for products such as those the Company proposes to develop is 
highly uncertain and involves complex factual and evolving legal questions. 
No assurance can be given that any patents issued or licensed to the Company 
will not be challenged, invalidated or circumvented, or that the rights 
granted under such patents will provide competitive advantages to the 
Company. On the other hand, it is important for the Company to obtain patent 
protection. This is particularly true in the case of the Company's stem cell 
technology where the first person or entity to discover and patent a 
particular stem or progenitor cell may effectively block all others, meaning 
that it will be critically important to the Company's stem cell development 
efforts for the Company or its collaborators to be the first to discover any 
stem cell which the Company is seeking to discover. Failure to be the first 
to make such a discovery would likely force the Company to terminate or 
substantially modify its efforts directed toward the discovery of the 
discovered stem cell, and would likely have a substantial adverse effect on 
the Company.

         EXISTENCE OF THIRD PARTY PATENTS AND PROPRIETARY RIGHTS; NEED TO OBTAIN
LICENSE - A number of pharmaceutical, biotechnology and other companies,
universities and research institutions have filed patent applications or have
been issued patents relating to cell therapy and encapsulation and other
technologies potentially relevant to or required by the Company's expected
products. The Company cannot predict which, if any, of such applications will
issue as patents or the claims that might be allowed. The Company is aware that
a number of entities have filed applications relating to stem and/or progenitor
cells. The Company is also aware of a number of third-party patent applications
and patents relating to cell encapsulation or claiming use of genetically
modified cells to treat disease, disorder or injury. In particular, the Company
is aware of a third-party U.S. patent which relates the use of cells for
alleviating chronic pain in humans and of two issued U. S. patents claiming
certain methods for treating defective, diseased or damaged cells in the
mammalian

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CNS by grafting genetically modified cells. The Company cannot predict the
effect of existing patent applications and patents on future unencapsulated
products. In addition, the Company is aware of third-party patents and patent
applications claiming rights to the neurotrophic factors (such as CNTF, NT 4/5,
Neurturin, and CT-1) which the Company hopes to deliver with its technology, and
to the production of these factors through the use of genetically modified
cells. The Company expects to use genetically modified cells to produce these
factors for use in its encapsulated products and expects that it may wish to
genetically modify its stem/progenitor cells. The Company may also be required
to seek licenses in regard to other cell lines, the techniques used in creating,
obtaining or maintaining such cell lines, the materials used in the manufacture
of its implants or otherwise. There can be no assurance that the Company will be
able to establish collaborative arrangements or obtain licenses to the foregoing
technology or to other necessary or desirable technology on acceptable terms, if
at all, or that the patents underlying any such licenses will be valid and
enforceable. See "Patents, Proprietary Rights and Licenses" in the Company's
Annual Report on Form 10-K.

         GOVERNMENT REGULATION - The Company's research, preclinical development
and clinical trials, as well as the manufacturing and marketing of its potential
products, are subject to extensive regulation by governmental authorities in the
United States and other countries. The process of obtaining FDA and other
required regulatory approvals is lengthy, expensive and uncertain. There can be
no assurance that the Company or its collaborators will be able to obtain the
necessary approvals to commence or continue clinical testing or to manufacture
or market its potential products in anticipated time frames, if at all. In
addition, several legislative proposals have been made to reform the FDA. If
such proposals are enacted they may result in significant changes in the
regulatory environment the Company faces. These changes could result in
different, more costly or more time consuming approval requirements for the
Company's products, in the dilution of FDA resources available to review the
Company's products, or in other unpredictable consequences. See "Government
Regulation" in the Company's Annual Report on Form 10-K.

         SOURCES OF CELLS AND OTHER MATERIALS - The Company's potential products
require genetically engineered cell lines or living cells harvested from animal
or human sources. There can be no assurance that the Company will successfully
identify or develop sources of the cells required for its potential products and
obtain such cells in quantities sufficient to satisfy the commercial
requirements of its potential products. These supply limitations may apply, in
particular, to primary cells that must be drawn directly from animal or human
sources, such as the bovine adrenal chromaffin cells currently used in the
Company's product for the treatment of pain. As an alternative to primary cells,
the Company is developing products based on the use of genetically altered
cells. Intellectual property rights to important genetic constructs used in
developing such cells, including the constructs used to develop cells producing
neurotrophic factors, are or may be claimed by one or more companies, which
could prevent the Company from using such cells. In addition, many suppliers of
materials used by the Company in its media, implants, and other components have
restricted the use of such materials for implantation into humans; if the
Company cannot obtain the necessary materials for its implants, the Company
would be adversely affected.

         MANUFACTURING UNCERTAINTIES - The Company's pilot manufacturing plant,
may not have sufficient capacity to permit the Company to produce all the
products for all of the clinical trials it anticipates developing. In addition,
the Company has not developed the capability to commercially manufacture any of
its proposed products and is unaware of any other company that has manufactured
any membrane-encapsulated cell product on a commercial scale. There can be no
assurance that the Company will be able to develop the capability of
manufacturing any of its proposed products at a cost or in the quantities
necessary to make a commercially viable product, if at all.

         COMPETITION - Competitors of the Company are numerous and include major
pharmaceutical and chemical companies, biotechnology companies, universities and
other research institutions. Currently, several of these competitors market and
sell therapeutic products for the treatment of chronic pain, Parkinson's disease
and other CNS conditions. In addition, most of the Company's competitors have
substantially greater capital resources, experience in obtaining regulatory
approvals and, in the case of commercial entities,

                                                                              41

<PAGE>

experience in manufacturing and marketing pharmaceutical products, than the
Company. A number of other companies are attempting to develop methods of
delivering therapeutic substances within or across the blood brain barrier.
There can be no assurance that the Company's competitors will not succeed in
developing technologies and products that are more effective than those being
developed by the Company or that would render the Company's technology and
products obsolete or non-competitive. See "Competition" in the Company's Annual
Report on Form 10-K.

         DEPENDENCE ON KEY PERSONNEL - The Company is highly dependent on the
principal members of its management and scientific staff and certain of its
outside consultants. Loss of the services of any of these individuals could have
a material adverse effect on the Company's operations. In addition, the
Company's operations are dependent upon its ability to attract and retain
additional qualified scientific and management personnel. There can be no
assurance the Company will be able to attract and retain such personnel on
acceptable terms given the competition among pharmaceutical, biotechnology and
health care companies, universities and research institutions for experienced
personnel.

         REIMBURSEMENT AND HEALTH CARE REFORM - In both domestic and foreign
markets, sales of the Company's potential products will depend in part upon the
availability and amounts of reimbursement from third-party health care payor
organizations, including government agencies, private health care insurers and
other health care payors such as health maintenance organizations and
self-insured employee plans. There is considerable pressure to reduce the cost
of therapeutic products. There can be no assurance that reimbursement will be
provided by such payors at all or without substantial delay, or, if such
reimbursement is provided, that the approved reimbursement amounts will provide
sufficient funds to enable the Company to sell its products on a profitable
basis. See "Reimbursement and Health Cost Control" in the Company's Annual
Report on Form 10-K.


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