CYTOTHERAPEUTICS INC/DE
10-K405, 1997-03-31
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
                                   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, 1996 

                                       OR

          [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
               SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

                         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
    of incorporation or organization)              Identification No.)

               2 RICHMOND SQUARE, PROVIDENCE, RHODE ISLAND 02906
              (Address of principal executive offices) (zip code)

       Registrant's telephone number, including area code: (401) 272-3310
        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
                                 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. [x]

     Aggregate market value of Common Stock held by non-affiliates at March 10,
1997: $140,832,286. Exclusion 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 10, 1997: 16,485,840 shares.

     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]

                      DOCUMENTS INCORPORATED BY REFERENCE
     Portions of the Registrant's Definitive Proxy Statement for its 1997 Annual
Meeting of Shareholders are incorporated by reference into Part III of this
Report.

                           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 product development and clinical programs, the need for, and timing
of, additional capital and capital expenditures, partnering prospects, the need
for additional intellectual property rights, 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,
development and clinical testing programs, obsolescence of the Company's
technology, lack of available funding, competition from third parties, failure
of the Company's collaborators to perform, regulatory constraints, litigation
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 and Management's Discussion and Analysis of
Financial Condition and Results of Operations.
<PAGE>   2

PART 1

                                   FORM 10-K
                             CYTOTHERAPEUTICS, INC.
                    For Fiscal Year Ended December 31, 1996

ITEM 1: BUSINESS

THE COMPANY

        CytoTherapeutics, Inc. ("CytoTherapeutics" or the "Company") is a
leader in the development of novel cell therapy systems designed to deliver
therapeutic substances to the central nervous system ("CNS"). The Company
believes that its core technology, based on cell-containing, biocompatible
implants, may be used to deliver a variety of therapeutic substances. The
Company focuses on treatment of CNS diseases using its capsules to deliver
proteins within the central nervous system, bypassing the blood brain barrier,
a fundamental obstacle to effective treatment of many CNS diseases. The Company
is currently developing products for the treatment of chronic pain, Parkinson's
disease and amyotrophic lateral sclerosis ("ALS") with additional research
efforts directed to several other CNS disorders including Huntington's disease.
The Company has also begun to develop products for treatment of certain
ophthalmologic diseases. The Company has two product candidates in clinical
trials: an implant to treat chronic pain and an implant to treat ALS.

     CytoTherapeutics, Inc. was incorporated in Delaware in 1989 and has one
subsidiary, Modex Therapeutiques S.A., a Swiss company fifty percent owned by
the Company.

The Unmet Need for CNS Therapies

     Diseases such as Parkinson's disease, ALS, pain and other degenerative
diseases of the CNS affect a significant portion of the U.S. population,
particularly the rapidly increasing older segment of the U.S. population. There
are generally few effective treatments for these diseases and their cost to
society is very high. Development of treatments for these diseases has been
constrained by the difficulty of delivering potential drugs to the CNS locations
where the drugs are needed. CytoTherapeutics believes that its encapsulated cell
therapy can overcome this constraint. If the Company can successfully develop
its cell therapy technology, it believes that its technology can provide the
platform for treatment of many presently untreatable CNS diseases.

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 ALS, is associated with impaired cellular function.

     Biotechnology has created major advances in the development of therapeutic
products. In particular, genetic engineering has allowed the production of
specific proteins which may be inadequately produced by the body's own cells,
whether as a result of genetic defect, disease or injury. Such advances have
overcome some of the limitations of traditional pharmaceuticals, such as lack of
specificity, but do not reproduce the natural ability of cells to secrete
substances at the precise sites of action and in the appropriate physiological
quantities or for the duration required. As a result, investigators have
considered replacing vital cells which are failing by implanting cells which
carry the ability to provide a needed critical molecule. 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.

                                       2
<PAGE>   3

The Potential of Cell Therapy

     Cell therapy, which is the use of cells to treat diseases, has the
potential to provide a broad therapeutic approach of comparable importance to
traditional pharmaceuticals and the more recently developed genetically
engineered biologics. However, autologous cells (cells from the individual to
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 effects
such as increased risk of infection or cancer. While transplantation of
autologous cells, such as those now used in some gene therapy, may not require
immunosuppression, these cells cannot be retrieved once administered, even if
medically necessary, and it appears to be difficult to control the level and
stable output of therapeutic substances which these unencapsulated cells
produce. CytoTherapeutics believes its encapsulation technology will reduce or
eliminate the need for immunosuppression, and allow site-specific delivery and
relative control of cell output, thus unlocking the potential of cell therapy.

CYTOTHERAPEUTICS' PLATFORM TECHNOLOGY: 
ENCAPSULATED CELL THERAPY

     Encapsulated cell therapy may provide the basis for treating a number of
currently poorly treated or untreatable diseases, especially those of the CNS.
The Company is employing its proprietary encapsulation techniques to develop
cell-containing, semipermeable polymer implants designed to be placed into
selected sites in the body to treat specific diseases or conditions. These
membranes are designed to restrict passage into the implant of substances above
a certain size, thereby protecting the transplanted cells by reducing their
exposure to the recipient's immune system. 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. Typical rejection mechanisms
are not activated or are muted because most of the elements of the recipient's
immune system, particularly complement and lymphocytes, generally are too large
to enter the capsules through the membrane and do not contact the transplanted
cells, which remain protected within the encapsulating membrane.

     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 cells contained within the membrane
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 provide the desired
therapeutic effect.

ADVANTAGES OF THE COMPANY'S PLATFORM TECHNOLOGY

     Many CNS diseases have no satisfactory treatment today, largely because
substances generally do not reach the CNS in therapeutic concentrations when
administered by conventional routes. The Company believes that its technology
represents an approach that may offer a number of advantages over other forms of
delivery for therapeutics, especially with regard to diseases and disorders of
the CNS or other so-called immunologically privileged sites.

Site-Specific CNS Delivery

     Researchers have identified a number of substances which may be beneficial
in the treatment of CNS disorders. However, it has been difficult or impossible
to find a safe and effective way to deliver many of these substances across the
blood brain barrier at the required concentrations. The blood brain barrier is a
tightly woven network of endothelial cells which protects the CNS. This barrier
restricts the molecules that can enter the brain tissue and excludes many
compounds that would otherwise pass from the bloodstream into the brain,
including a large number of therapeutics. These therapeutics are generally given
by systemic administration, which necessarily distributes the compound
throughout the body and results in only a small fraction of the compound
reaching the CNS. Systemic delivery may also cause significant side effects
since very potent molecules are being delivered to sites in the body where they
are not normally present. This is especially likely where large amounts are
administered systemically to provide higher levels in the CNS. A recent clinical
trial of a new protein, CNTF, for example, resulted in significant systemic side
effects after peripheral administration.


                                       3

<PAGE>   4



     In contrast, CytoTherapeutics' cell-containing devices are designed to
deliver these therapeutic substances within the brain, spinal column, the
surrounding fluid-filled spaces or the eye, bypassing the blood brain barrier
(or the blood retina barrier) and directing the therapeutic substances to the
site or sites where they are needed. With this site-specific delivery, the
Company believes that its devices may be capable of delivering the required
amount of therapeutic substance in the locations where it is actually 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 the therapeutic substances are produced by living cells
sustained within the implant, these doses potentially may be delivered over
extended periods of time. The production of these substances at the site of
action eliminates the problems of drug stability which hamper delivery from
pumps and polymers. 

Retrievability

     The Company's implants are designed to be retrievable. If complications
arise, or if a new implant is desired, a physician should be able to retrieve
and replace the capsule. This retrievability also offers a potential safety
advantage over unencapsulated cells, which may be difficult or impossible to
recover from the recipient. Moreover, the capsule keeps the cells in the
location intended as opposed to unencapsulated cells which cannot be so
constrained.

Delivery of Multiple Substances

     The Company's implants may provide the advantage of delivering multiple
therapeutic substances at a single site. In many instances, the body naturally
produces at a single location a number of substances vital to normal function of
cells and the body. The Company believes that the ability to provide multiple
substances simultaneously could lead to development of improved therapies. The
Company's implant to treat chronic pain is one such example of delivery of
multiple substances. In addition, preclinical research suggests that multiple
proteins may be better than any single factor in the treatment of certain
diseases such as ALS. In the CNS, in particular, the Company believes that the
simultaneous delivery of multiple neurotrophic factors may be useful for
treatment of certain chronic CNS disorders, and the Company is developing
methods to deliver such multiple factors.

     There can be no assurance that the Company will successfully develop its
encapsulation technology commercially or that, if successfully developed, it
will achieve the benefits described above or that the advantages of such
technology will be greater than the potential disadvantages. 

PRODUCT DEVELOPMENT PROGRAMS AND RESEARCH EFFORTS 

Overview of Research and Product Development Strategy

     The Company's product development strategy is based on the Company's belief
that its technology can be used to deliver a wide variety of therapeutic
substances across the blood brain barrier and the blood retina barrier. 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
to the CNS. The Company is evaluating development of implants delivering other
agents of known activity. The next group of proposed products in the Company's
pipeline seeks to build on the Company's expertise in cell encapsulation to
deliver to the CNS genetically engineered therapeutics, such as neurotrophic
factors, for the treatment of such chronic and disabling CNS disorders as ALS,
Parkinson's and Huntington's disease. The Company has also established a program
to treat diseases of the eye. In addition, the Company is investigating the use
of encapsulated and unencapsulated neural stem cells for the treatment of
various CNS disorders.

        The following table lists the potential therapeutic indications for and
current status of CytoTherapeutics' primary product development programs and
research 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 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. 

                                       4


<PAGE>   5



<TABLE>
====================================================================================================================================
                                                    PRODUCT DEVELOPMENT PROGRAMS
                                                    AND RESEARCH PROGRAMS PROGRAM
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
        PROGRAM                         CELL TYPE(1)                     STATUS(2)                            PARTNER
- ------------------------------------------------------------------------------------------------------------------------------------
   <S>                            <C>                          <C>                                       <C>    
      Chronic pain                    Bovine adrenal            Phase I studies completed in                  Astra AB
                                     chromaffin cells            approximately 50 patients;        
                                                                Phase II start in cancer pain     
                                                                  and/or neuropathic pain           
                                                               anticipated in first half of 1997 
                                ----------------------------------------------------------------------------------------------------
                                     Engineered cells                     Research                            Astra AB
                                   releasing analgesics 

- ------------------------------------------------------------------------------------------------------------------------------------
   Parkinson's disease               Engineered cells                    Preclinical                       Genentech, Inc.
                                        releasing                        development
                                   neurotrophic factor(s)             
- ------------------------------------------------------------------------------------------------------------------------------------
   Amyotrophic lateral               Engineered cells                Swiss pilot clinical                CytoTherapeutics, Inc.
        sclerosis                     releasing CNTF                   study under way     
                                ----------------------------------------------------------------------------------------------------
                                     Engineered cells                    Preclinical                        Genentech, Inc.*
                                   releasing NT4/5 and                   development
                                          CT-1                           
- ------------------------------------------------------------------------------------------------------------------------------------
   Huntington's disease               Engineered cells                    Research                          Genentech, Inc.*
                                   releasing neurotrophic
                                         factor(s)             
- ------------------------------------------------------------------------------------------------------------------------------------
      Ophthalmologic                  Engineered cells                   Preclinical                      CytoTherapeutics, Inc.
         diseases                        releasing                       development
                                   neurotrophic factor(s),                 
                                    anti-inflammatory(s)    
                                  and/or antiangiogenic(s)
- ------------------------------------------------------------------------------------------------------------------------------------
    Multiple sclerosis               Neural stem cells                    Research                        CytoTherapeutics, Inc. 
                                      (unencapsulated) 
====================================================================================================================================

<FN>

(1)  All cells are encapsulated unless otherwise indicated. Engineered cells are
     genetically altered xenogeneic cells generally derived from rodents.

(2)  "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.
     "Pilot clinical study" refers to an initial clinical study in a small
     number of patients.

     *Genentech has commercialization options in these programs; they are funded
     by CytoTherapeutics.

</TABLE>

                                       5



<PAGE>   6

Chronic Pain Program

     The Company estimates that more than 1,200,000 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 including 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.
Patients may become intolerant of or unresponsive to narcotics such as morphine,
and may experience undesirable side effects. Narcotics must also be carefully
monitored to prevent overdosage. Surgical intervention to relieve severe,
chronic pain is often irreversible, can have severe side effects and does not
always provide relief.

     The Company believes that its technologies can be used to treat chronic
pain by implanting encapsulated cells which release 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 for the treatment of chronic pain. The
Company believes that encapsulating properly chosen cell types may provide more
effective pain relief than traditional approaches and/or may allow treatment of
patients who experience little relief with today's therapies.

     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, at Centre Hospitalier Universitaire Vaudois in
Switzerland. The study 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 and 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. The protocol called for patient treatment to extend for the
remaining life of the patient. 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 28, 1997, two of the four patients had completed the
study. The two patients that remain in the study have each had a device in place
for nearly one year without any related significant safety issues.

        Based upon the safety profile obtained in the Phase I study, the Company
and Astra have elected to move forward into Phase IIA and IIB studies.

     After extensive discussions of draft submissions with FDA, in February
1997, the Company submitted two protocols to conduct additional trials under the
current Company-sponsored IND in the United States. The first proposed study is
a clinical trial in neuropathic pain patients who are opioid unresponsive. This
study will serve as the starting point of an expanded Phase II program, provided
that it demonstrates safety and retrievability of a modified device. The second
proposed study is a Phase II clinical trial in patients suffering from cancer or
cancer-related pain.

     The Company expects to conduct a further clinical trial of its pain implant
in neuropathic pain patients following completion of the Phase II study
described above.

     All trials are being run in collaboration with Astra Pain Control, the
Company's partner.

     The Company is also working to develop a second-generation implant for the
treatment of chronic pain based on a cell line. The cell line is expected to
secrete a number of known analgesic substances.

     There can be no assurance that the Company will timely receive the
regulatory approvals necessary to commence such clinical trials or that such
clinical trials will be successfully completed or that, if successfully
completed, will lead to the commercialization of such 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. See "Corporate Collaborations -- Astra
AB."


                                        6
<PAGE>   7

Parkinson's Disease Program

     Parkinson's disease ("PD") is a progressively debilitating neurological
disorder characterized by tremor, rigidity and slowness of spontaneous movement.
The symptoms of PD result from low levels of the neurotransmitter dopamine in
the striatum (a portion of the brain) due to the death of dopamine-producing
cells in the substantia nigra, a related area of the brain. The causes of the
disease are unknown. There is no known cure for PD nor is there any known method
for arresting or reversing the fundamental neurodegenerative process that
results in the death of dopamine-producing cells.

     PD affects approximately 500,000 individuals in the United States, and it
is estimated that one in 500 people over 50 years of age will develop this
disorder. It is thought that approximately 50,000 new cases are diagnosed
annually in the United States, and this number is expected to increase as the
population ages. The Company's proposed product will initially be targeted for
use by the estimated 300,000 mid-to-late-stage PD patients in the United States.

     Currently approved therapies for PD include the systemic oral
administration of drugs such as L-dopa (a dopamine precursor), compounds that
stimulate the cellular receptors activated by dopamine (receptor agonists),
deprenyl (an inhibitor of a dopamine degradative enzyme), and related
medications. These agents generally provide adequate treatment of the disease
for a limited period. As the disease progresses, however, patients become
increasingly resistant to the benefits of the medications while concurrently
becoming susceptible to a variety of motor and cognitive side effects. Under
these circumstances, they often require extensive supportive care.

     The Company is developing an implant to treat PD. The goal of this program
is to slow or prevent progression of the underlying degeneration of dopaminergic
neurons by delivering neurotrophic factors to the brain. The initial focus of
the program is the delivery of Neurturin, a neurotrophic factor with partial
homology to GDNF, a factor which has shown promise in preclinical models of PD.
The Company believes that, if successfully developed, its implants will be
capable of delivering effective, low doses of Neurturin to the areas of the
brain where they are required.

     The Company has entered into an agreement with Genentech for the
development of implants releasing neurotrophic factor(s) to treat PD. See
"Corporate Collaborations - Genentech, Inc."

ALS Program

     Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is
characterized by progressive loss of motor control and death due to degeneration
of neurons in the motor system. The Company estimates that approximately 25,000
patients have ALS in the United States. The cause of ALS is unknown in most
cases. There is no known cure for the disease.

     The Company is sponsoring research to evaluate the feasibility and
tolerability of using encapsulated cells to deliver neurotrophic factors into
the CNS to treat ALS. Dr. Aebischer and his colleagues have conducted
preclinical studies that showed that encapsulated cells delivering CNTF, a
neurotrophic factor, slowed the degeneration of the motor neurons affected in
ALS.

       In March 1995, Dr. Aebischer began an investigator-sponsored pilot (or
feasibility) trial of CNTF-releasing, encapsulated cells in ALS patients. The
trial, which enrolled 10 patients, was intended to show that these devices could
be safely implanted in patients, that devices could safely deliver a recombinant
protein (CNTF) directly into the cerebral spinal fluid ("CSF") for a period of
three months or longer and that no significant side effects would be
experienced. In November 1995, the Company reported that all of these objectives
had been achieved. The Company believes that this was the first demonstration
that genetically engineered xenogeneic cells can deliver a neurotrophic factor
in the CSF for up to three months. There have been no significant safety issues
in these patients; however, the membrane/cell combination chosen did lead to
some signs of immune recognition to the xenogeneic cells in some patients. In
December 1996, Dr. Aebischer initiated a second ALS trial to test modifications
of the implant used in the initial pilot study. The results of such trial are
not yet available.

     Two other companies have conducted clinical trials of systemic rather than
direct CNS administration of CNTF to treat ALS. Both such trials have been
halted, reportedly because of side effects or lack of efficacy. A third company
conducted clinical trials of systemically administered BDNF, another
neurotrophic factor, to treat ALS. This trial was considered unsuccessful,
reportedly due to lack of efficacy.

     The Company believes that administration of growth factors directly to the
CNS is preferable to the systemic administration that was utilized in prior
clinical trials and that its encapsulation approach may diminish or eliminate
the significant side effects reported in other trials while achieving
therapeutic levels of growth factors within the CNS. Recently published research
suggests that delivery of multiple neurotrophic factors may be required for
effective treatment of ALS. The Company believes its technology may be a
particularly promising way to deliver multiple neurotrophic factors.


                                       7


<PAGE>   8

     In November 1996, the Company signed a license agreement with Genentech,
Inc., that licensed to the Company rights to develop encapsulated cell delivery
of NT4/5 and CT-1 to treat ALS (see "Corporate Collaborations - Genentech,
Inc."). CT-1 is related CNTF and the Company believes CT-1 could be a promising
factor for the treatment of ALS. In addition, both CT-1 and NT4/5 have shown
promise in promoting growth and survival of motor neurons in preclinical
research experiments, and evidence suggests that the combined effects of these
factors, when administered together, are greater than effects of the factors
administered alone. If preclinical experiments continue to be encouraging, the
Company expects to shift from clinical trials of CNTF to trials of the
combination of NT4/5 and CT-1 to treat ALS. See "Patents, Proprietary Rights and
Licenses." 

Huntington's Research

     Huntington's disease ("HD") is an autosomal dominant, progressive
neurodegenerative disease resulting in movement disorders, psychiatric
disturbances, and death. The symptoms of HD are caused primarily by the death of
striatal neurons. In 1993, there were approximately 25,000 patients with
symptomatic HD in the United States. The genetic abnormalities that cause HD
have been identified, allowing definitive diagnosis of the disorder and
identification of at-risk individuals. The manner in which these genetic
abnormalities cause HD is unknown. There is no known cure or treatment for the
disease.

     The Company has conducted studies demonstrating the ability of
neurotrophic-factor releasing, encapsulated cells to slow or halt neuronal death
in certain animal models of HD. In these models, the Company has shown that
implants releasing NGF or CNTF have the ability to reduce the neuronal death
implicated in HD and that dysfunction normally associated with striatal neuronal
damage could be significantly attenuated. A pilot clinical trial, scheduled to
begin in 1997 in Europe, will evaluate the feasibility and tolerability of
implanting encapsulated cells that produce CNTF into the CNS of HD patients.

     In November 1996, CytoTherapeutics entered into an agreement with
Genentech, Inc. for the development and marketing of implants that release CT-1
to treat HD (see "Corporate Collaborations - Genentech, Inc."). CT-1, also known
as cardiotropin, is a recently identified member of the cytokine family of
growth factors with shared similarities in receptor binding to CNTF. Members of
this family have, in preclinical studies, demonstrated direct protective actions
on motor-neuron populations affected in ALS. The Company believes that CT-1's
activity will be similar to that observed previously with CNTF. If the results
of additional experiments and the planned European safety trial are encouraging,
the Company intends to test the possibility of using CT-1 to treat HD.

Ophthalmology Program

     Many diseases of the eye are presently ineffectively treated, frequently
leading to blindness. 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 because they occur in the posterior portion of the eye, an area
that is essentially unreachable with 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 retina 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.

     The Company is designing its ocular implants to release a number of
different factors depending on the disease being treated. Thus, the Company is
evaluating neurotrophic factors for neurodegenerative diseases (e.g., glaucoma
and retinitis pigmentosa), antiangiogenics for treatment of excessive
neovascularization (e.g., macular degeneration and diabetic retinopathy), and
anti-inflammatories for ocular inflammation (e.g., uveitis). The complicated
nature of the underlying disease processes make it likely that multiple factors
may be required for effective treatment. The Company is evaluating the various
eye diseases to determine which to address first and to choose and obtain access
to the most appropriate factor(s). As part of its assessment, the Company is
considering both existing products with known therapeutic action and novel
factors, such as neurotrophic factors whose activities and therapeutic utility
in humans are promising, but unproven at the present time. The Company does not
have rights to any such factors for the ophthalmologic use at present. See
"Patents, Proprietary Rights and Licenses."

     CytoTherapeutics has begun constructing implants adapted for use in the eye
and has started preclinical testing. The Company expects to undertake
preclinical animal tests to evaluate the safety and potential efficacy of these
implants in 1997.


                                       8

<PAGE>   9

OTHER AREAS OF RESEARCH AND EVALUATION


Neurotrophic Factors

     An important recent advance in neurobiology has been the identification and
production of a number of neurotrophic factors; these factors are natural
proteins essential for the development, survival and function of a number of
critical neuronal cells. Neurotrophic factors may be significant because
neurons, the basic functional cells of the nervous system, do not regenerate if
lost or damaged. The survival of these neurons in certain stressful conditions
may be dependent on the presence of these factors.

     Specifically, the progressive death of neurons is characteristic of a
number of neurodegenerative disorders, including Parkinson's disease,
Huntington's disease, ALS and Alzheimer's disease, and is also characteristic of
several important eye diseases. It is generally believed that application of
appropriate neurotrophic factors to the neurons associated with these diseases
could slow or halt their degeneration and/or death and hence slow disease
progression.

     A number of biotechnology companies have developed techniques for producing
naturally occurring neurotrophic factors by genetically engineering cells to
produce these factors. Neurotrophic factors, however, do not easily cross the
blood brain barrier or blood retina barrier. This obstacle, among others, has so
far hindered the practical use of neurotrophic factors as treatments for
neurodegenerative diseases of the CNS.

     The Company believes that its technology may represent a practical means of
delivering neurotrophic factors across the blood brain barrier or the blood
retina barrier. The Company is developing implants which encapsulate cells
secreting neurotrophic factors for application to a number of neurodegenerative
diseases. The ability to deliver a combination of neurotrophic factors singly or
in combination may be important, because no single neurotrophic factor has been
shown to protect all classes of neurons, and the Company believes certain
neurotrophic factors may act jointly to provide increased biological activity.

     The Company is exploring the development of a number of implants based on
cells which could secrete various neurotrophic factors. The Company believes its
technology may be the best way to deliver these factors, both alone and in
combination. All of the cell lines under investigation by the Company for
inclusion in these implants are subject to issued patents or patent claims held
by third parties and, with the exception of its agreements with Genentech, the
Company currently has no rights under patent or patent applications of third
parties to use these cell lines in a commercial product. There can be no
assurance that the Company will be able to obtain licenses for these cell lines.
See "Patents, Proprietary Rights and Licenses" and "Corporate Collaborations."

Conopeptides

     CytoTherapeutics is also investigating a series of very potent compounds,
called conopeptides, derived from hunting snails. These molecules appear to be
highly specific for certain CNS receptors and channels. The Company believes
these compounds may represent novel ways to address certain CNS disorders when
provided using the Company's technology. The Company's efforts in this area are
undertaken as part of its collaboration with Cognetix, Inc. See "Corporate
Collaborations - Cognetix, Inc."

Neural Stem Cells

     The Company is investigating use of neural stem cells for two distinct
purposes. First, since these cells are native to the CNS, they could represent
an ideally adapted cell for encapsulated use in the CNS environment. These
cells, though not transformed, may be genetically manipulated and subsequently
expanded in large numbers.

     In addition, these stem cells may be useful for direct grafting into the
CNS. Preliminary experiments indicate, that at least in some cases, these cells
may be able to repopulate depleted glial cell populations such as those lost in
multiple sclerosis. Thus, these cells, which can be differentiated into the
major neuronal and glial cells of the CNS, might form the basis for replacement
of cells lost in certain neurodegenerative diseases.

                                       9

<PAGE>   10

     In 1994, the Company entered into a contract research and license agreement
with NeuroSpheres, Ltd. for the development of therapeutic products involving
the implantation of neural stem cells. See "Corporate Collaborations -
NeuroSpheres, Ltd." The Company's neural stem cell program is at an early stage
and there can be no assurance that it will result in any commercial product or
that its license from NeuroSpheres will have commercial value. The Company is
arbitrating a dispute under the agreement. See "Corporate Collaborations -
NeuroSpheres, Ltd" and "Item 3 - Legal Proceedings." 

Gene Therapy

     Developments in biotechnology have opened the new field of genetic therapy
in which cells are transformed with specific DNA sequences to produce substances
that may be useful in treating human disease. However, commercialization of such
genetic constructs to treat diseases faces a number of hurdles. Among the more
significant of these hurdles is the general inability to sustain or control the
dose of the protein introduced into the patient by such a genetic construct or
to reverse therapy when it is no longer needed or wanted. In addition, although
the risk may be small, the disabled viruses most commonly used in gene therapy
may, in rare instances, become competent to release viral particles, thereby
providing a chance for the infection of the host.

     Under certain circumstances, the Company's technology may be preferred to
unencapsulated, autologous cell gene therapy, such as when site-specific,
sustained output is important or reversibility is valuable. The Company's
encapsulation techniques, if successfully developed and applied in conjunction
with gene therapy, should allow cells placed into the body to be removed when
desired or necessary. The Company is continuing to investigate the use of its
technology for gene therapy. 

FURTHER DEVELOPMENT OF CORE TECHNOLOGY 

Core Technology Development

     The Company continues to develop and extend its core technology. Through
its cell biology program, the Company is developing genetically engineered cell
lines that will function optimally when encapsulated. The encapsulating membrane
must typically be customized for each cell line selected and for each intended
therapeutic application. Similarly, the medium (which bathes the cells with
required nutrients) and, when appropriate, the matrix (materials within the
membrane which provide a framework for cell growth and viability) must also be
selected for each cell line.

     The Company is developing cell lines which may represent important
components in second-generation products (e.g., an engineered cell line
secreting analgesics in its pain program) or new products (such as a single
device delivering multiple therapeutic substances). It is also conducting
research to improve cell line expression levels, as well as regulation and
consistency of output. While to date the cells used in the Company's programs
have been derived from animals (xenotransplants), in recognition of the
international concern focused on the risks of xenotransplantation as well as to
optimize the function of implants, the Company is investigating the use of human
cell lines. There can be no assurance such development will be successful or of
regulatory benefit.

     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, better handling characteristics, better transport qualities
and greater biocompatibility. These efforts are undertaken internally as well as
externally with Akzo Nobel Faser AG. See "Corporate Collaborations - Akzo Nobel
Faser AG."

     The Company is expanding the range of matrices it evaluates for use in its
implants. The Company's goals in this area are to develop matrices with longer
life, greater stability and enhanced effects in controlling cell viability
and/or productivity.

     The Company believes that its growing knowledge of how effectively to
combine diverse cell lines, media, matrices and membranes and how to utilize
diverse sites for implantation represent important aspects of its proprietary
base technology, and this knowledge may allow the Company to develop a variety
of products capable of producing a wide range of substances that may be useful
for the treatment of a number of diseases.

     The Company is also assessing and developing distribution, handling and
insertion systems that will 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. The Company views the
proprietary techniques it is developing to sustain the living cells contained
within its implants through the manufacturing process and their subsequent
distribution to and surgical implantation by clinicians as an additional,
important element of its evolving core technology. See "Manufacturing." 

                                       10

<PAGE>   11

Modex Therapeutiques S.A.

     In July 1996, CytoTherapeutics established Modex Therapeutiques S.A. as a
50%-owned, Swiss biotherapeutics company to pursue extensions of
CytoTherapeutics' broad-based, encapsulated-cell technology for 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), and 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.

     CytoTherapeutics has invested $2 million in Modex, with a commitment to
invest Sfr 2.4 million on the second anniversary of the agreement if Modex has,
prior to that time, achieved one or more specified scientific milestones, in
exchange for a 50% stake in Modex. An investment fund managed by Lombard Odier &
Cie, a Swiss private bank, invested $2 million in Modex, with a commitment to
invest Sfr 1.2 million on the second anniversary of the agreement, in exchange
for a 15% stake in Modex. The balance of the Company is held by the scientific
founders.

     CytoTherapeutics has granted to Modex an exclusive, royalty-bearing license
to CytoTherapeutics' proprietary encapsulated-cell technology for three
applications outside the central nervous system (diabetes, obesity and anemia).
Modex has granted to CTI an exclusive royalty-bearing license to any technology
developed or obtained by Modex for application to diseases, conditions and
disorders which affect the central nervous system. In addition to its royalty
obligations, CTI is also obligated under this agreement to issue to Modex up to
300,000 shares of CTI Common Stock on the achievement by Modex of certain
scientific milestones. Substantially all of these shares are expected to be
awarded by Modex as incentive compensation to Modex's founding scientists and
other researchers upon the achievement of such milestones.

     During the first two years following closing, the Company has the right to
acquire the fund's interest in Modex for the greater of a 30% annual return or
Sfr 3.6 million. Following this two-year period, CytoTherapeutics has the right
to purchase the fund's interest in Modex at 110% of fair market value. Following
the second anniversary of the agreement and prior to the tenth anniversary of
the agreement, if no public market exists for the Common Stock of Modex, the
fund has the right to require CytoTherapeutics to purchase the fund's interest
in Modex for 90% of the fair market value of such interest. Any purchase made by
CytoTherapeutics under any of the circumstances described in this paragraph may
be made, at CytoTherapeutics' option, in cash or shares of CytoTherapeutics
Common Stock valued at the market price at the time of purchase.

     The scientific founders of Modex are Patrick Aebischer, M.D., Ph.D.,
Professor of Surgery and Director of Surgical Research and the Gene Therapy
Center at the CHUV; Max Wilhelm, Ph.D., who serves as Modex's Chief Executive
Officer and was previously Director of Pharmaceutical Research and Development
at Ciba-Geigy Corporation where he was responsible for worldwide research and
development operations; Bernard Thorens, Ph.D., Professor at the Institute of
Pharmacology at the University of Lausanne; and Shimon Efrat, Ph.D., Associate
Professor at the Department of Molecular Pharmacology at Albert Einstein College
of Medicine at Yeshiva University. Dr. Aebischer is Chairman of Modex and also a
scientific founder of CytoTherapeutics and a member of its Board of Directors.

     Under the terms of the agreement between CytoTherapeutics and the
scientific founders of Modex, CytoTherapeutics has the right to acquire, and the
founders have the right to require CytoTherapeutics to acquire, the founders'
initial equity interest in Modex in exchange for the issuance of an aggregate of
approximately 92,000 shares of CytoTherapeutics Common Stock. 

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, nonrefundable 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 $5
million-$7 million, which the Company expects should approximate the research
and development costs incurred by the Company under the plan. Approximately
$18,865,000 has been received by the Company through December 31, 1996. Subject
to the successful development of potential products and obtaining necessary
regulatory approvals, Astra is obligated to conduct clinical trials of such
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 entitled to
a royalty on the worldwide net sales of such products in return for the 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.

                                       11

<PAGE>   12

Genentech, Inc.

     On November 25, 1996 the Company entered into three agreements with
Genentech, Inc. ("Genentech") to develop treatments for Parkinson's disease,
Huntington's disease and amyotrophic lateral sclerosis ("ALS"). Under the
agreements the Company and Genentech will pursue treatments for these diseases
that utilize the Company's encapsulated cell technology to deliver several of
Genentech's growth factors, potentially including neurotrophin-4/5 ("NT-4/5"),
cardiotrophin-1 ("CT-1") and Neurturin. These agreements supersede the
Development Collaboration and License Agreement between the Company and
Genentech entered into in March 1994 which related in part to the development of
a product for the treatment of Alzheimer's disease using NGF.

          The following is a brief overview of each of the agreements:

Parkinson's Agreement

     The initial focus of the research under the Development Collaboration and
License Agreement relating to Parkinson's disease (the "Parkinson's Agreement")
is the development of a treatment for Parkinson's disease using Neurturin. Under
the Parkinson's Agreement, the Company is obligated to perform certain
preclinical studies and a pilot Phase I clinical study using Neurturin (unless
another growth factor is agreed upon by the parties). Genentech purchased $8.3
million of the Company's Common Stock (829,171 shares at $10.01 per share) to
fund the Company's expenses associated with such preclinical and pilot clinical
studies. If the parties agree that additional funds are required to complete
such studies, Genentech will purchase additional shares of the Company's Common
Stock (at the then current market price of the Company's Common Stock) to
provide the Company the additional required funding.

     Genentech has the right to terminate development under the Parkinson's
Agreement after the completion of each of (i) the preclinical studies, (ii) the
pilot Phase I clinical trial and (iii) a specified Phase II clinical trial.
Should Genentech decide to proceed to Phase II clinical trials, Genentech will
purchase additional shares of the Company's Common Stock (at the then current
market price of the Company's Common Stock) to fund such study. If following
completion of the preclinical studies, the pilot clinical study or the Phase II
study, Genentech decides to terminate further development under the Parkinson's
Agreement or if Genentech terminates the Parkinson's Agreement as a result of a
breach of the Parkinson's Agreement by the Company, and the funds 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 has the right to require the Company
to repurchase from Genentech shares of Company Common Stock having a value equal
to the amount of overfunding (based on the per share price at which Genentech
purchased such shares of Common Stock from the Company). The Company is
obligated to use reasonable efforts to complete its development obligations
under the Parkinson's Agreement within a prescribed period.

     In the event Genentech decides to continue with Phase III clinical trials,
Genentech and the Company will share the cost of United States Phase III
clinical trials and Genentech will pay for any clinical testing required to sell
products developed under the Parkinson's Agreement outside the United States.
Genentech will extend the Company a line of credit to provide the Company cash
to fund the Company's share of the expenses of the Phase III trials in the
United States. The line of credit, together with interest thereon, is repayable,
at the option of the Company, in either cash or through the issuance of shares
of the Company's Common Stock having a value (based on the then current market
price of the Company's Common Stock) equal to the outstanding amount of the
loan.

     Upon commercialization, Genentech and the Company will share profits in the
United States at an agreed-upon percentage, and Genentech will pay the Company a
royalty based on sales outside the United States. The Company will retain
manufacturing rights and will be paid manufacturing costs for products sold. In
the event the Parkinson's Agreement is terminated because of the Company's
default or bankruptcy, the Company is required to grant Genentech a license to
the Company's cell encapsulation technology and transfer to Genentech related
technology for use solely with the products developed under the Parkinson's
Agreement.

     Under the Parkinson's Agreement, the Company has granted Genentech an
exclusive license to use the Company's cell encapsulation technology, with
certain of Genentech's growth factors for the treatment of Parkinson's disease.
Under the Parkinson's Agreement, the Company is also prohibited from entering
into certain agreements relating to the development of treatments for
Parkinson's disease using certain compounds. 

                                       12

<PAGE>   13

ALS Agreement

     Pursuant to the License Agreement Between the Company and Genentech
relating to Treatment of Amyotrophic Lateral Sclerosis (the "ALS Agreement")
Genentech has granted the Company a license to CT-1 and NT-4/5 to develop
products for the treatment of ALS using the Company's cell encapsulation
technology. Subject to certain limitations discussed below, the Company is
responsible for all expenses associated with the preclinical and clinical
development under the ALS Agreement and is obligated to pay Genentech royalties
on net sales of products developed under the ALS Agreement. The Company's
license to CT-1 and NT-4/5 is dependent upon the Company using reasonable
efforts to achieve certain development milestones within prescribed periods.

     The Company has the right to commercialize the product(s) outside the
United States. Upon the successful completion of a specified Phase II clinical
trial, Genentech has the option to obtain exclusive rights to sell products
developed under the ALS Agreement in the United States by agreeing to pay an
agreed upon percentage of the expenses of United States Phase III clinical
development of such products. If Genentech makes such an election, the parties
will share profits on sales of such products in the United States. In all
events, the Company would continue to have the exclusive right to sell products
developed under the ALS Agreement outside the United States, subject to a
royalty payable to Genentech. In the event the ALS Agreement is terminated
because of the Company's default or bankruptcy, the Company is required to grant
Genentech a license to the Company's cell encapsulation technology and transfer
to Genentech related technology for use solely with the products developed under
the ALS Agreement.

Huntington's Agreement

     Under the License Agreement Relating to Treatment of Huntington's Disease
(the "Huntington's Agreement"), Genentech has granted the Company an exclusive
license to CT-1 to develop, make, use and sell products for the treatment of
Huntington's disease that utilize CT-1 and the Company's cell encapsulation
technology. The Company is responsible for all preclinical and clinical
development under the Huntington's Agreement, including all expenses associated
with such development. The Company will pay Genentech a royalty based on net
sales of any products developed under the Huntington's Agreement. The Company's
license to CT-1 is dependent upon the Company using reasonable efforts to
achieve certain development milestones within prescribed periods.

     Upon the earlier of (i) the Company declining to grant a third-party
sublicense under the Huntington's Agreement, and (ii) the successful completion
of the specified Phase II trial on a product developed under the Huntington's
Agreement, Genentech has the option to require the Company to negotiate
exclusively with Genentech for a limited period regarding Genentech codeveloping
and comarketing products developed under the Huntington's Agreement. In the
event the parties are unable to reach an agreement, the Company would have the
right to sublicense its rights under the Huntington's Agreement to a third
party, provided such third-party offers the Company terms more favorable to the
Company than the terms of Genentech's last offer. In the event the Huntington's
Agreement is terminated because of the Company's default or bankruptcy, the
Company is required to grant Genentech a license to the Company's cell
encapsulation technology and transfer to Genentech related technology for use
solely with products developed under the Huntington's Agreement.

Akzo Nobel Faser AG

     To develop additional new membranes to be used in the Company's 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 Faser AG ("Akzo") dated December 1, 1993. Akzo is the world's
largest supplier of medical grade membranes. Under the terms of the agreement,
Akzo and the Company are evaluating Akzo's existing membranes to determine if
the membranes can be used in connection with the Company's proposed products. In
addition, 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. In such
event, Akzo would 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.


                                       13

<PAGE>   14

     For the years ending December 31, 1996, 1995 and 1994, the Company paid
Akzo under the terms of the agreement $294,545, $118,000 and $146,000,
respectively. 

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. The Company is exploring use of these cells both as sources of
differentiated neuronal cells and as genetically engineered cells that secrete
selected therapeutic substances.

     Upon the execution of the agreement, the Company paid $310,000 to
NeuroSpheres. In addition, the Company is required to provide research funding
to NeuroSpheres totaling $875,000 through February 1998, of which $625,000 had
been paid through December 31, 1996. Upon the achievement of certain milestones,
the Company is obligated to make payments to NeuroSpheres totaling a maximum of
$3,750,000, payable at NeuroSpheres' option in cash or in shares of the
Company's Common Stock, at a price of $12.50 per share. Upon commercial sale of
a product utilizing the licensed technology, the Company is obligated to pay a
range of royalties based on product revenues and market share, subject to
certain minimum royalties. In order to maintain exclusivity, the Company is also
obligated to expend an additional amount to support research related to
development of products under the agreement. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations - Liquidity and
Capital Resources."

     The Company has filed for arbitration of a dispute that has arisen between
it and NeuroSpheres, Ltd under the agreement. NeuroSpheres has sued
CytoTherapeutics in Alberta, Canada, seeking to add arbitration issues.
CytoTherapeutics has also filed suit in Rhode Island to prevent NeuroSpheres
from licensing rights to third parties which have been exclusively licensed to
the Company. The Company believes that position taken by NeuroSpheres is without
merit. See "Item 3. Legal Proceedings."

Cognetix, Inc.

     In February 1997, CytoTherapeutics, Inc. 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.

     Cognetix is developing proprietary conopeptides and similar compounds that
are believed to act on specific target receptors in the CNS. Under the
agreement, CytoTherapeutics will have access to these proprietary compounds and
Cognetix's ongoing research for the purpose of selecting therapeutic molecules
that could be produced with genetically modified cells and delivered to the CNS
through gene therapy approaches including the use of the Company's encapsulation
technology.

     Under the agreement, CytoTherapeutics expects to invest approximately
$1,750,000 over the next 12 months to acquire approximately a 19.9% ownership
position in Cognetix. Cognetix has agreed to work exclusively with
CytoTherapeutics in regard to the delivery of its proprietary peptides through
the transplantation of genetically engineered cells and CytoTherapeutics has
agreed to work exclusively with Cognetix in regard to such delivery of such
peptides.

     In the collaboration, CytoTherapeutics and Cognetix expect initially to
focus on several conopeptides that are believed to act in a highly specific way
as calcium, sodium and potassium channel blockers. Additionally, the companies
plan to target a subfamily of conopeptides known as conantokins, which are
believed to function as potent NMDA receptor antagonists. The Companies believe
that, because of their high potency and selectivity for specific receptors, the
conantokins and other selected conopeptides represent attractive therapeutic
candidates for a broad range of neurological disorders, such as epilepsy,
Parkinson's disease, chronic pain, stroke and spinal ischemia as well as
ophthalmologic diseases.

     Based on in vitro data, a screening committee comprised of an equal number
of representatives from each of CTI and Cognetix will determine which compounds
to select for IN VIVO studies and possible clinical trials. 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. 

                                       14

<PAGE>   15

Neocrin Company

     In December 1993, the Company transferred substantially all of the assets
of its program for the treatment of Type I diabetes by primary cells to Neocrin
Company. In exchange for such assets, the Company received preferred stock
representing a 10% ownership interest in Neocrin at the time of the transaction,
and Neocrin assumed certain liabilities related to the transferred assets.

     The Company has retained rights to its proprietary membrane technology,
which were not included in the agreement with Neocrin. The Company also agreed
not to compete with Neocrin through the use or licensing of its membrane
technology for the treatment of diabetes through the encapsulation of primary
islet cells. In February 1995, CytoTherapeutics purchased warrants and shares of
Neocrin's preferred stock for $500,000 as required in its agreement with
Neocrin.

     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 $2,331,000 valuation
reserve to reduce the investment value to $200,000.

OTHER ARRANGEMENTS

     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 $1,337,000, $1,008,000 and $864,000 for the years ended December
31, 1996, 1995 and 1994, respectively. The Company also has a number of
collaborative relationships with other academic institutions and academic
researchers.

     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. 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.

MANUFACTURING     

     The Company believes the ability to manufacture encapsulated cell products
which are safe and effective will be a key source of competitive advantage.
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 are now in operation.

     Implants for clinical trials are currently made in small quantities. The
commercial scale manufacture of these products is expected to require
specialized automated or semiautomated equipment. The Company's current
manufacturing process has been designed to facilitate the incorporation of
additional automation over time. Over the last year, modifications of the
process have been introduced to allow manufacture at greater volume to support
pivotal efficacy trials.

     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, may 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 which 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 or to

                                       15

<PAGE>   16

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. There can be no assurance that
the Company will be able to develop the capability of manufacturing any of its
proposed products, or to identify and contract with manufacturers to produce
such products, at a cost, consistency or in the quantities necessary to make a
commercially viable product.

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 will seek to retain
limited marketing rights in specific markets, particularly where the product may
be addressed by a limited, directed 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 nonexclusive rights to a portfolio of patents
and patent applications related to the encapsulation of cells and related
technologies. In general, these 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.
Currently, the Company's U.S. patent portfolio includes rights to 21 issued
patents and a number of pending patent applications.

     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 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 and other technologies
potentially relevant to or required by the Company's expected products. In
particular, a third party has informed the Company that it will receive 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 which might be allowed. The Company is aware
that a number of companies have filed applications relating to cell
encapsulation. The Company is also aware of a number of patent applications and
patents relating to cell encapsulation or 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 one issued patent 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 (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 products.


                                       16

<PAGE>   17

     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, 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 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, Genentech, Inc. and NeuroSpheres, Ltd. to
certain patents and know-how regarding present and certain future developments
in encapsulation technology and neural stem cells, respectively. The Company's
licenses may be canceled or converted to nonexclusive 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, Parkinson's
disease, ALS and other diseases for which the Company's technology may be
applicable, and several companies are developing methods to deliver products
into the CNS. 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, alter the prognosis of these diseases or prevent
their onset.

     The market for therapeutic products that address such 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,
may experience competition from epidural and intrathecal opiates, such as
morphine and its analogs, and from adjuvant analgesics, antidepressants and
anticonvulsants, as well as from 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.


                                       17
  

<PAGE>   18

     The Company's products to treat Parkinson's disease, if successfully
developed, may compete with orally administered drugs which contain L-dopa, cell
transplantation, ablative and stimulation procedures and new drugs under
development. Neurotrophic factors delivered to the patient other than with the
Company's encapsulation technology, such as by gene therapy, also represent
potential products that may compete with the Company's products. In addition,
certain companies are attempting to develop gene therapies including products
(which may or may not involve neurotrophic factors) for the treatment of a
number of neurodegenerative diseases, including Parkinson's disease.

     The FDA has recently approved a drug to treat ALS and applications for
approval of other products are pending. CytoTherapeutics believes that the only
approved drug for ALS, Riluzole, will not represent significant competition for
any product that demonstrates reasonable efficacy.

     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 noncompetitive. 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.

     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 premarket 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
xenotransplantation of 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 (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.


                                       18

<PAGE>   19

     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 in patients under the supervision of a qualified principal 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.
In certain instances, as may be the case with the Company's potential products,
the FDA permits Phase I clinical trials to be conducted using a small number of
patients instead of healthy volunteers. 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
postmarketing 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.

     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 expects to 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.


                                       19

<PAGE>   20

     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 significant concern by regulatory agencies about the risks
of cell transplantation. For example, the United Kingdom has adopted a
moratorium on xenotransplantation pending further research and discussion and
the EC Commission has introduced a ban in the Member Countries of the European
Union on the use of "high risk material" from cattle and sheep in the
manufacture of pharmaceuticals (this ban would apparently include the cells used
in the Company's pain program). The FDA has also recently published proposed
guidelines which impose significant constraints on the conduct of clinical
trials utilizing xenotransplantation. These actions have been taken pursuant to
the expressed need to protect against the spread of diseases from nonhuman cells
to humans. In addition, the FDA has published a "Proposed Approach to Regulation
of Cellular and Tissue-Based Products" in which the FDA proposes a plan for
regulating certain products based on human cells. The Company cannot presently
determine the effect of such actions nor what other actions may be taken;
restrictions on the testing or use of cells (whether nonhuman or human) as human
therapeutics could adversely affect the Company's product development programs
and the Company.

     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 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 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 HEALTHCARE 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 healthcare 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 healthcare 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 healthcare-related companies may be
affected by the continuing efforts of governmental and third-party payers to
contain or reduce the cost of healthcare 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 healthcare 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 has engendered could have a material adverse
effect on the Company. 

                                       20

<PAGE>   21

EMPLOYEES

        As of March 10, 1997, the Company had 127 full-time employees,
including 27 employees with Ph.D. or M.D. degrees. Approximately 100 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 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:

     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 S.A.

     James M. Anderson, M.D., Ph.D., Professor of Pathology, Institute of
Pathology, Case Western Reserve University, Cleveland, Ohio.

     Donald B. Calne, Ph.D., Professor of Neurology, University of Vancouver,
Vancouver, Canada.

     Constance L. Cepko, Ph.D., Professor, Department of Genetics, Harvard
Medical School, Boston, Massachusetts.

     William F. Hickey, M.D., Chairman of Pathology, Dartmouth-Hitchcock Medical
Center, Lebanon, New Hampshire.

     Rakesh K. Jain, Ph.D., Professor of Health Science & Technology, Harvard
Medical School, Massachusetts General Hospital and Massachusetts Institute of
Technology, Boston, Massachusetts.

     Alan Michaels, Sc.D., Distinguished University Professor, Emeritus, North
Carolina State University, Durham, North Carolina.

     Peter Morris, Ph.D., Department of Surgery, Oxford University, Oxford,
England.

     Richard Penn, M.D., Professor of Neurosurgery, Rush Presbyterian, Chicago,
Illinois.

     David A. Tirrell, Ph.D., Professor of Polymer Science, University of
Massachusetts, Amherst, Massachusetts.

     Tony L. Yaksh, Ph.D., Professor and Vice Chairman for Research, Department
of Anesthesiology, University of California, San Diego, California.


                                       21

<PAGE>   22

ITEM 2.

PROPERTIES

     The Company's research laboratories and administrative offices are located
in two adjacent leased facilities in Providence, Rhode Island, where it occupies
approximately 33,000 s.f. The facilities are leased pursuant to agreements which
the Company may terminate upon nine months' notice. In addition, the Company has
leased a 21,000 s.f. pilot manufacturing facility and a 3,000 s.f. 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.

     Due to an anticipated increase in the number of employees, the Company's
current facilities may not be sufficient to accommodate the Company's needs past
the end of 1997.

     As a result of the need for more space, the Company has purchased land and
a building in Lincoln, Rhode Island, near its pilot plant facility and has begun
renovation of the purchased building and construction of a second building to
provide 63,000 square feet of new space. The Company expects the new facilities
to be ready for occupancy in the fourth quarter of 1997. The renovation and
construction are being financed under a bank loan. The Company expects that the
new facilities will provide sufficient space for at least the next two years.

ITEM 3. 

LEGAL PROCEEDINGS

     The Company has filed an arbitration proceeding with the International
Chamber of Commerce in Toronto, Canada, against NeuroSpheres, Ltd. pursuant to
the dispute settlement provisions of the Research Agreement between the Company
and NeuroSpheres. The Company is seeking a determination of the particular kinds
of cells CytoTherapeutics has licensed under the agreement. There is a court
proceeding brought by NeuroSpheres to add claims to the arbitration in the Court
of Queen's bench, Calgary, Alberta. In addition, the Company has filed a
complaint and request for injunctive relief to prevent NeuroSpheres from
licensing to third parties' rights NeuroSpheres has licensed exclusively to
CytoTherapeutics. This action was filed in the U.S. District Court for the
District of Rhode Island.

     CytoTherapeutics believes that NeuroSpheres' proposed interpretation of the
definition of the cells that are licensed to the Company under the Research
Agreement, which is the basis of the dispute, is legally and scientifically
without merit.

ITEM 4.

SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     None.


                                       22


<PAGE>   23

PART II

ITEM 5.

MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDERS MATTERS

<TABLE>
     The Company's Common Stock is listed on the NASDAQ National Market under
the Symbol "CTII". The following table sets forth, for the periods indicated,
the high and low sales price as reported by the NASDAQ National Market for the
Company's Common Stock.
<CAPTION>

                                                                                High              Low
                                                                               ------------------------
             1997

             Quarter Ended

             <S>                                                               <C>              <C>
                 March 31, 1997 (through March 10, 1997) ....................  $10 7\8          $ 8 7\8


- -------------------------------------------------------------------------------------------------------
             1996
             Quarter Ended

                 December 31, 1996 ..........................................  $11              $ 7 5\8

                 September 30, 1996 .........................................   12 5\8            7 1\8

                 June 30, 1996 ..............................................   15 1\2           10 5\8

                 March 31, 1996 .............................................   18 3\4           12 3\4

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

             1995

             Quarter Ended

                 December 31, 1995 ..........................................  $18 1\4          $ 8 1\4

                 September 30, 1995 .........................................   11 3\8            6 1\4

                 June 30, 1995                                                   7 5\8            5 3\4

                 March 31, 1995 .............................................    7 1\8            3 1\4

- -------------------------------------------------------------------------------------------------------
</TABLE>

     As of March 10, 1997, there were approximately 226 holders of record of the
Common Stock. The Company estimates that there are approximately 3,800
beneficial holders of the Company's 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 in a transaction exempt
from registration pursuant to Section 4(2) of the Securities Act.

                                       23

<PAGE>   24

ITEM 6.
SELECTED FINANCIAL DATA


<TABLE>
<CAPTION>
                                                                                         Year Ended December 31,
(in thousands, except per share amounts)                              1996          1995          1994          1993         1992
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>             <C>         <C>            <C>           <C>    
STATEMENT OF OPERATIONS DATA
        Revenue from collaborative agreements ..................   $  7,104        $11,761     $  1,250       $    190      $   325

        Research and development expenses ......................     17,130         14,730       13,514         11,807        8,204

        Loss on other investment ...............................         --         (2,331)          --             --           --

        Gain on sale of technology .............................         --             --           --          1,780           --
        
        Net loss ...............................................    (13,759)        (8,891)     (16,461)       (12,544)      (9,975)
        
        Net loss per share (1) .................................      (0.89)         (0.69)       (1.52)         (1.47)       (1.33)

        Shares used in computing net loss per share (1) ........     15,430         12,799       10,833          8,541        7,474

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

<CAPTION>


                                                                                               December 31,
(in thousands)                                                        1996          1995          1994          1993         1992
- ------------------------------------------------------------------------------------------------------------------------------------
BALANCE SHEET DATA

        Cash, cash equivalents and marketable securities .......   $ 42,607        $44,192     $ 19,138        $30,855      $27,208

        Total assets ...........................................     58,397         56,808       32,194         40,996       35,239

        Long-term debt, including capitalized leases ...........      8,223          5,441        5,641          3,428        3,896

        Redeemable common stock ................................      8,159             --           --             --           --

        Stockholders' equity ...................................     34,747         45,391       22,637         34,509       29,203

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

<FN>

(1) See Note 2 to consolidated financial statements.

</TABLE>

                                       24

<PAGE>   25

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 consolidated 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, nonrecurring licensing payments. 

RESULTS OF OPERATIONS 
YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994

     Revenues from collaborative agreements totaled $7,104,000, $11,761,000 and
$1,250,000 for the years ending December 31, 1996, 1995 and 1994, respectively.
Revenues in 1996 and 1995 were earned solely from a Development, Marketing and
License Agreement with Astra AB, which was signed in March 1995. Included in the
1995 revenue was a one-time licensing fee from Astra of $5,000,000. During 1994,
the Company derived research revenue from an agreement with Genentech, Inc.

     Research and development expenses totaled $17,130,000 in 1996, as compared
to $14,730,000 in 1995 and $13,514,000 in 1994. The increase of $2,400,000, or
16%, from 1995 to 1996 was primarily attributable to increases in the number of
research, development and production staff, spending for company-sponsored
research at academic and other institutions and scientific consulting. The
increase of $1,216,000, or 9%, from 1994 to 1995 was principally due to an
increase in the number of research and development staff, as well as increased
occupancy costs related to the expansion of pilot manufacturing and research
facilities.

     General and administrative expenses were $5,679,000 for the year ended
December 31, 1996, compared with $4,620,000 in 1995 and $4,723,000 in 1994. The
increase of $1,059,000, or 23%, from 1995 to 1996 was principally due to
increases in the number of administrative personnel, one-time hiring bonuses, as
well as, consulting costs attributable to the establishment of Modex
Therapeutiques S.A., a 50%-owned Swiss subsidiary. The decrease of $103,000, or
2%, from 1994 to 1995 was primarily attributable to the absence of a one-time
expense of $275,000 incurred in 1994 related to the exercise of a release from
the Company's further obligations in connection with its collaboration with
Medtronic, partially offset by legal expenses incurred in 1995 in connection
with the closing of the collaborative agreement with Astra.

     Interest income for the years ended December 31, 1996, 1995 and 1994
totaled $2,260,000, $1,714,000 and $963,000, respectively. The average cash and
investment balances were $37,600,000, $26,907,000 and $24,537,000 in 1996, 1995
and 1994, respectively. The increase in interest income from 1995 to 1996 was
principally due to higher average balances. The increase in interest income from
1995 to 1994 was attributable to significantly higher interest rates, as well as
higher average balances.

     In 1996, interest expense was $618,000, compared with $685,000 in 1995 and
$437,000 in 1994. The decrease in 1995 to 1996 is principally due to decreasing
balances of capitalized lease obligations only partially offset by additional
collateralized loan obligations. The increases in 1995 and 1994 were primarily
attributable to additional facility and equipment financings related to the
construction and expansion of the Company's pilot manufacturing facilities
through capitalized leases, collateralized loans and direct financing
transactions.

     In December 1995, the Company recognized a loss on its investment in
Neocrin Company of $2,330,848, as it determined that the carrying value in its
investment had been permanently impaired. The valuation reserve of $2,330,848
reduced the valuation of the investment to $200,000.


                                       25


<PAGE>   26

     The net loss in 1996, 1995 and 1994 was $13,759,000, $8,891,000 and
$16,461,000, respectively. The loss per share was $0.89, $0.69 and $1.52 in
1996, 1995 and 1994, respectively. The decreased loss in 1996 and 1995 is
principally due to revenue earned for research funding under the Company's
agreement with Astra. The 1995 loss also contains revenue for the nonrecurring
licensing payment of $5,000,000 from Astra. 

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 $42,607,000 at December 31, 1996. Cash equivalents and
marketable securities are invested in agencies of the United States government,
investment grade corporate bonds and money market funds.

     The Company currently occupies all of its laboratory and administrative
office space, other than that at its pilot manufacturing site, under the terms
of operating leases subject to termination upon nine months' notice by the
Company. As a result of an anticipated increase in the number of employees, the
Company's current facilities will not be sufficient to accommodate the Company's
needs past the end of 1997. The Company has purchased land and a building and
began construction of a new headquarters and laboratory facility in the fourth
quarter of 1996. The total cost of the project is estimated to be $7,600,000.

     In October 1996, the Company obtained financing of $5,500,000 from a bank,
secured by a mortgage on the new facility. The Company had borrowed $1,450,000
under this agreement as of December 31, 1996. Any unused commitment expires
October 31, 1997. Quarterly principal payments of 1/40 of the loan balance
commence September 30, 1997 with the balance due at maturity, October 2001. The
loan agreement requires the Company provide cash collateral in the amount of 25%
of the obligation if the Company's unencumbered cash balance falls below
$25,000,000, 50% cash collateral if the Company's unencumbered cash balance
falls below $20,000,000 and full cash collateral if the Company's unencumbered
cash balance falls below $15,000,000. The Company expects to pay the remaining
costs from its funds.

     In May 1996, the Company secured an equipment loan facility with a bank in
the amount of $2,000,000. The Company has borrowed $741,000 under this agreement
as of December 31, 1996. The loan requires interest payments only for the first
year; principal payments are payable over a three-year period beginning August
1997. Any unused commitment expires on May 15, 1997. The loan is secured by
equipment purchased with the proceeds of the credit facility.

     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. Based on IN VITRO data, a screening committee comprised of an equal
number of representatives from each of CytoTherapeutics and Cognetix will
determine which compounds to select for IN VIVO studies and possible clinical
trials. 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, CytoTherapeutics has purchased $250,000 of Cognetix preferred
stock and subject to certain milestones, is obligated to purchase a total of
$1,750,000 of Cognetix stock over the next year.

     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 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 common stock for $8,300,000 to fund development of
products to treat Parkinson's disease. Additional equity purchases and other
funding by Genentech is available for future clinical development as determined
by the parties. If the Parkinson's program is terminated and the funds 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 has the right to require the Company
to repurchase from Genentech shares of Company Common Stock having a value equal
to the amount of 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 such time as the related funds are expended on the program.
Upon commercialization, Genentech and the Company will share profits in the
United States at an agreed-upon percentage, and Genentech will pay the Company a
royalty based upon deals outside the United States. The Company retains
manufacturing rights and will be paid manufacturing costs for products sold.


                                       26

<PAGE>   27

     The Company also licensed certain growth factors for the treatment of both
Huntington's disease and amyotrophic lateral sclerosis ("ALS"). Under the terms
of the 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 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. These
agreements supersede the Development Collaboration and License Agreement between
the Company and Genentech entered into in March 1994.

     In July 1996, the Company invested $2 million in Modex, a 50%-owned Swiss
subsidiary, to pursue extensions of the Company's encapsulated-cell technology
for specific applications outside the central nervous system, with a commitment
to invest Sfr 2.4 million on the second anniversary of the agreement if Modex
has, prior to that time, achieved one or more specified scientific milestones.
An investment fund, managed by a Swiss private bank, has invested $2 million in
Modex, with a commitment to invest Sfr 1.2 million on the second anniversary of
the agreement, in exchange for a 15% stake in the company. The remaining 35% of
Modex is owned by the scientific founders of Modex. The Company has granted to
Modex an exclusive, royalty-bearing license to the Company's proprietary
encapsulated-cell technology for three applications outside the central nervous
system: diabetes, obesity and anemia. Modex granted the Company an exclusive
royalty-bearing license to any technology developed or obtained by Modex for
application to diseases, conditions and disorders which affect the central
nervous system. In addition to its royalty obligations, the Company is also
obligated to issue to Modex up to 300,000 shares of the Company's Common Stock
on the achievement by Modex of certain scientific milestones. Substantially all
of these shares are expected to be awarded by Modex as incentive compensation to
Modex's founding scientists and other researchers upon achievement of such
milestones.

     Under the terms of its agreement with the investment fund, during the first
two years following closing, the Company has the right to acquire the fund's
interest in Modex for the greater of a 30% annual return or Sfr 3.6 million.
Following this two-year period, the Company has the right to purchase the fund's
interest at 110% of fair market value. Following the second anniversary of the
agreement and prior to the tenth anniversary of the agreement, if no public
market exists for the common stock of Modex, the fund has the right to require
the Company to purchase the fund's interest in Modex for 90% of the fair market
value of such interest. Any purchase made by the Company under any of the
circumstances described in this paragraph may be made at the Company's option in
cash or shares of the Company's Common Stock valued at the market price at the
time of purchase. The Company also has the right to acquire, and the founders
have the right to require the Company to acquire, the founders' initial equity
interest in Modex in exchange for the issuance of an aggregate of approximately
92,000 shares of the Company's Common Stock.

     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, nonrefundable
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 $5 million to $7 million, which the Company expects should
approximate the research and development costs incurred by the Company under the
plan. Subject to the successful development of such products 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 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
entitled to a royalty on the worldwide net sales of such products in return for
the 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 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. Terms of the agreement provide future research funding of up to
$250,000 through February 1998 based upon performance of certain obligations by
NeuroSpheres. Upon the achievement of certain milestones, the Company will make
payments to NeuroSpheres totaling a maximum of $3,750,000, payable at
NeuroSpheres' option, in cash or in shares of the Company's common stock at a
price of $12.50 per share. Upon commercial sale of a product utilizing the
licensed technology, the Company is obligated to pay a range of royalties based
on product revenues and market share, subject to certain minimum royalties. In
order to maintain exclusivity, the Company is also obligated to expend
additional amounts to support research related to development of products under
the agreement.

                                       27


<PAGE>   28

     The Company has instituted an arbitration proceeding in Alberta, Canada,
against NeuroSpheres, Ltd. pursuant to the dispute settlement provisions of the
research agreement between the Company and NeuroSpheres. The Company is seeking
a determination of the definition of the cells to which CytoTherapeutics has
rights under the agreement. In addition, the Company has filed a complaint and
request for injunctive relief to prevent NeuroSpheres from licensing to third
parties rights it has licensed exclusively to CytoTherapeutics. This action was
filed in the United States District Court for the District of Rhode Island.
CytoTherapeutics believes that NeuroSpheres proposed interpretation of the
definition of the cells licensed is legally and scientifically without merit.
  
     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, expansion of 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 second half of 1998. 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 or to license its
potential products or technologies to third parties. 

CAUTIONARY FACTORS RELEVANT TO FORWARD-LOOKING INFORMATION

     A number of factors have affected and in the future could affect the
Company's results and could cause actual results and needs of the Company to
vary materially from forward-looking statements made in this Annual Report by
the Company on the basis of management's current expectations. The business in
which the Company is engaged is rapidly changing, extremely competitive and
involves a high degree of risk, and accuracy with respect to forward-looking
projections is difficult.

     There can be no assurance that the substantial funding required by the
Company will be available (whether from new or existing corporate partnerships,
equity offerings or otherwise) when needed, if at all, or on terms acceptable to
the Company. None of the Company's products or proposed products has been
approved for commercial sale or entered Phase II or 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, be
subject to significant competition from other products or suffer delays in
development that could adversely affect their value. Cell transplantation is
subject to increasing regulation which may adversely affect the Company; in
particular, the use of xenogeneic cells has come under much more restrictive
regulation recently. Patent protection for the Company's products is important,
but highly uncertain. In addition, there can be no assurance that the Company
will be able to obtain the intellectual property needed to commercialize its
proposed products. For further information, see Exhibit 99 to the Company's
Annual Report on Form 10-K.


                                       28

<PAGE>   29

ITEM 8.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                         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, 1996 and 1995, and the related
     consolidated statements of operations, changes in redeemable stock and
     stockholders' equity and cash flows for each of the three years in the
     period ended December 31, 1996. These financial statements are the
     responsibility of the Company's management. Our responsibility is to
     express an opinion on these financial statements 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, 1996 and 1995, and the
     consolidated results of its operations and its cash flows for each of the
     three years in the period ended December 31, 1996, in conformity with
     generally accepted accounting principles.



     /s/Ernst + Young LLP


     
     Boston, Massachusetts 


     February 6, 1997, except for Note 17, as 
     to which the date is February 13, 1997

                                       29

<PAGE>   30


                             CytoTherapeutics, Inc.
<TABLE>

                                                    CONSOLIDATED BALANCE SHEETS
<CAPTION>


                                                                                     December 31,
                                                                              1996                 1995
                                                                          ---------------------------------  
<S>                                                                       <C>                  <C>         
ASSETS
Current assets:
    Cash and cash equivalents .........................................   $ 19,921,584         $  9,548,579
    Marketable securities .............................................     22,685,855           34,643,160
    Accrued interest receivable .......................................        653,190              793,215
    Other current assets ..............................................        491,582              678,070
                                                                          ---------------------------------  
Total current assets ..................................................     43,752,211           45,663,024

Property, plant and equipment, net ....................................     10,732,102            7,892,763

Other assets, net .....................................................      3,912,430            3,251,718
                                                                          ---------------------------------  
Total assets                                                              $ 58,396,743         $ 56,807,505
                                                                          =================================  


LIABILITIES AND STOCKHOLDERS' EQUITY 
Current liabilities:
    Accounts payable ..................................................   $  1,850,925         $    623,968
    Accrued expenses ..................................................      2,308,844            2,458,451
    Deferred revenue ..................................................      1,859,092            1,750,000
    Current maturities of capitalized lease obligations ...............        553,557              668,325
    Current maturities of long-term debt ..............................        695,570              474,245
                                                                          ---------------------------------  
Total current liabilities .............................................      7,267,988            5,974,989

Capitalized lease obligations, less current maturities ................      3,971,594            4,498,957
Long-term debt, less current maturities ...............................      4,251,008              942,181

Commitments and contingencies

Redeemable common stock, $.01 par value;
    815,065  shares issued and outstanding at December 31, 1996 .......      8,158,798                   --

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; 
    15,614,333 and 15,176,997 shares issued and outstanding
    at December 31, 1996 and 1995, respectively .......................        156,144              151,770
    Additional paid-in capital ........................................    107,649,659          104,271,658
    Accumulated deficit ...............................................    (72,922,674)         (59,163,536)
    Unrealized gains on marketable securities .........................         14,760              131,486
    Cumulative translation adjustment .................................        (60,416)                  --
    Deferred compensation .............................................        (90,118)                  --
                                                                          ---------------------------------  
Total stockholders' equity ............................................     34,747,355           45,391,378
                                                                          ---------------------------------  
Total liabilities and stockholders' equity ............................   $ 58,396,743         $ 56,807,505
                                                                          =================================
</TABLE>

See accompanying notes to consolidated financial statements.

                                       30
<PAGE>   31

                             CytoTherapeutics, Inc.
<TABLE>
                                               CONSOLIDATED STATEMENTS OF OPERATIONS
<CAPTION>

                                                                         Year ended December 31,
                                                             1996                1995                1994
                                                        -----------------------------------------------------

<S>                                                     <C>                  <C>                 <C>         
Revenue from collaborative agreements ...............   $  7,104,284         $11,760,666         $  1,250,000

Operating expenses:

    Research and development ........................     17,130,392          14,729,703           13,513,685

    General and administrative ......................      5,678,783           4,619,733            4,722,597
                                                        -----------------------------------------------------
                                                          22,809,175          19,349,436           18,236,282
                                                        -----------------------------------------------------


Loss from operations ................................    (15,704,891)         (7,588,770)         (16,986,282)

Other income (expense):

    Interest income .................................      2,259,886           1,713,849              962,942

    Interest expense ................................       (618,213)           (685,470)            (437,345)

    Other income ....................................        404,128                  --                   --                   

    Currency exchange loss ..........................       (100,048)                 --                   --

    Loss on other investment ........................             --          (2,330,848)                  --
                                                        -----------------------------------------------------
                                                           1,945,753          (1,302,469)             525,597
                                                        -----------------------------------------------------
Net loss ............................................   $(13,759,138)        $(8,891,239)        $(16,460,685)
                                                        =====================================================
Net loss per share ..................................   $       (.89)        $      (.69)        $      (1.52)
                                                        =====================================================
Shares used in computing net loss per share .........     15,429,564          12,799,008           10,833,008
                                                        =====================================================
</TABLE>


See accompanying notes to consolidated financial statements.

                                       31
<PAGE>   32

                             CytoTherapeutics, Inc.
<TABLE>
                                                Consolidated Statements of Changes
                                        in Redeemable Common Stock and Stockholders' Equity
<CAPTION>

                                                                  
                                        Redeemable                                                            
                                       Common Stock            Common Stock         Additional                 
                                    ------------------      ------------------       Paid-in      Accumulated '
                                    Shares      Amount      Shares      Amount       Capital        Deficit      
- -------------------------------------------------------  -------------------------------------------------------
<S>                               <C>      <C>            <C>          <C>       <C>             <C>            
Balances, January 1, 1994              --  $       --     10,467,553   $104,676  $ 68,861,427    $(33,811,612)  
Issuance of common stock               --          --        375,873      3,759     3,706,274              --   
Exercise of stock options              --          --        160,142      1,601       441,257              --   
Amortization of deferred  
    compensation                       --          --             --         --            --              --   
Change in unrealized losses
    on marketable securities           --          --             --         --            --              --   
Net loss                               --          --             --         --            --     (16,460,685)  
- -------------------------------------------------------  -------------------------------------------------------
Balances,
    December 31, 1994                  --          --     11,003,568    110,036    73,008,958     (50,272,297)            
Issuance of common stock               --          --      4,070,598     40,706    30,797,086              --   
Exercise of stock options              --          --        102,831      1,028       465,614              --   
Amortization of deferred
     compensation                      --          --             --         --            --              --   
Change in unrealized
    gains on marketable           
    securities                         --          --             --         --            --              --   
Net loss                               --          --             --         --            --      (8,891,239)  
- -------------------------------------------------------  -------------------------------------------------------
Balances,
    December 31, 1995                  --          --     15,176,997    151,770   104,271,658     (59,163,536)  
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 gains
    on marketable securities           --          --             --         --            --              --   
Change in cumulative
    translation adjustment             --          --             --         --            --              --   
Net loss                               --          --             --         --            --     (13,759,138)  
- -------------------------------------------------------  -------------------------------------------------------
Balances,
    December 31, 1996             815,065  $8,158,798     15,614,333   $156,144  $107,649,659    $(72,922,674)  
=======================================================  =======================================================
</TABLE>

                                      32
<PAGE>   33

<TABLE>
<CAPTION>
                                   
                                    Unrealized                                            
                                   Gains (Losses)  Cumulative                    Total    
                                   on Marketable   Translation     Deferred   Stockholders
                                     Securities    Adjustments  Compensation    Equity    
- ------------------------------------------------------------------------------------------- 
<S>                                <C>           <C>             <C>          <C>                     
Balances, January 1, 1994          $      --     $       --      $(645,291)   $ 34,509,200  
Issuance of common stock                  --             --             --       3,710,033  
Exercise of stock options                 --             --             --         442,858  
Amortization of deferred                                                                
    compensation                          --             --        536,020         536,020  
Change in unrealized losses                                                             
    on marketable securities        (100,356)            --             --        (100,356) 
Net loss                                  --             --             --     (16,460,685) 
- ------------------------------------------------------------------------------------------- 
Balances,                                                                               
    December 31, 1994               (100,356)            --       (109,271)     22,637,070  
Issuance of common stock                  --             --             --      30,837,792  
Exercise of stock options                 --             --             --         466,642  
Amortization of deferred                                                                
     compensation                         --             --        109,271         109,271  
Change in unrealized                                                                    
    gains on marketable                                                                 
    securities                       231,842             --             --         231,842  
Net loss                                  --             --             --      (8,891,239) 
- ------------------------------------------------------------------------------------------- 
Balances,                                                                               
    December 31, 1995                131,486             --             --      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 gains                                                              
    on marketable securities        (116,726)            --             --        (116,726) 
Change in cumulative                                                                    
    translation adjustment                --        (60,416)            --         (60,416) 
Net loss                                  --             --             --     (13,759,138) 
- ------------------------------------------------------------------------------------------- 
Balances,                                                                               
    December 31, 1996              $  14,760       $(60,416)     $ (90,118)   $ 34,747,355  
=========================================================================================== 
                                
</TABLE>

See accompanying notes to consolidated financial statements.

                                       32

                                                      CytoTherapeutics, Inc.
<TABLE>
                                               CONSOLIDATED STATEMENTS OF CASH FLOWS
<CAPTION>
                                                                                 Year ended December 31,
                                                                  1996                   1995                    1994
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>                    <C>                     <C>          
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss ...................................................  $(13,759,138)          $ (8,891,239)           $(16,460,685)
Adjustments to reconcile net loss to net cash used 
 for operating activities:
    Depreciation and amortization ..........................     1,671,068              1,465,351               1,821,746
    Amortization of deferred compensation ..................        95,083                109,271                 536,020
    Common stock issued as compensation ....................       406,733                     --                      --
    Loss on other investment ...............................            --              2,330,848                      --
    Loss on sale of fixed assets ...........................           871                     --                      --
    Changes in operating assets and liabilities:
      Accrued interest receivable ..........................       140,025               (606,395)                158,018
      Other current assets .................................       220,688               (293,909)                (31,814)
      Accounts payable and accrued expenses ................     1,077,350                183,680                 567,681
      Deferred revenue .....................................       109,092              1,750,000                      --
                                                              ------------------------------------------------------------
Net cash used in operating activities ......................   (10,038,228)            (3,952,393)            (13,409,034)

CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities .........................    (3,083,621)           (48,127,842)            (11,967,992)
Proceeds from sales of marketable securities ...............    14,924,200             24,139,057              24,005,704
Purchase of property, plant and equipment ..................    (4,412,190)            (1,405,522)             (3,729,500)
Proceeds on sale of fixed assets ...........................         3,000                     --                      --
Purchase of other investment ...............................            --               (500,100)                     --
Acquisition of other assets ................................      (811,305)              (550,116)             (1,133,018)
                                                              ------------------------------------------------------------
Net cash provided by (used in) investing activities              6,620,084            (26,444,523)              7,175,194

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of redeemable common stock ..........     8,300,000                     --                      --
Proceeds from issuance of common stock .....................     1,668,542             30,837,792               3,710,033
Proceeds from the exercise of stock options and warrants ...       980,697                466,642                 442,858
Proceeds from debt financings ..............................     4,059,947                859,832               3,318,455
Repayments of debt and lease obligations ...................    (1,171,926)              (934,661)               (815,531)
                                                              ------------------------------------------------------------
Net cash provided by financing activities ..................    13,837,260             31,229,605               6,655,815
Effect of exchange rate on cash and cash equivalents .......       (46,111)                    --                      --
                                                              ------------------------------------------------------------
Increase in cash and cash equivalents ......................    10,373,005                832,689                 421,975
Cash and cash equivalents, January 1 .......................     9,548,579              8,715,890               8,293,915
                                                              ------------------------------------------------------------
Cash and cash equivalents, December 31 .....................  $ 19,921,584           $  9,548,579            $  8,715,890
                                                              ============================================================

Supplemental disclosure of cash flow information:
    Interest paid ..................................          $    616,671           $    700,806            $    412,020
</TABLE>
See accompanying notes to consolidated financial statements.

                                       33


<PAGE>   34

                             CytoTherapeutics, Inc.

                   Notes to Consolidated Financial Statements
                           December 31, 1996 and 1995

1.   NATURE OF BUSINESS

     CytoTherapeutics, Inc. (the "Company") is a biopharmaceutical company
engaged in the development of proprietary products and technology designed to
deliver therapeutic substances to the central nervous system.

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

PRINCIPLES OF CONSOLIDATION

     The 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 financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the 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:

           Building and improvements             1 - 15 years
           Machinery and equipment               4 - 10 years
           Furniture and fixtures                3 - 10 years

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 expense at the time such patents are deemed to
have no continuing value. At December 31, 1996 and 1995, total costs capitalized
were $2,887,000 and $2,184,000 and the related accumulated amortization was
$126,000 and $64,000, respectively. Patent expense totaled $249,000, $195,000
and $193,000 in 1996, 1995 and 1994, respectively. 


                                       34


<PAGE>   35
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 nonqualified 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.

FOREIGN CURRENCY TRANSLATION

     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 States 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.

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.

IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS

     In 1996, the Company has adopted Statement No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed Of,
which requires impairment losses to be recorded on long-lived assets used in
operations when indicators of impairment are present and the undiscounted cash
flows estimated to be generated by those assets are less than the assets'
carrying amount. Statement 121 also addresses the accounting for long-lived
assets that are expected to be disposed of. The adoption of Statement 121 had no
impact on the financial position or results of operations of the Company as no
indications of impairment currently exist.

RECLASSIFICATIONS

     Certain reclassifications have been made to conform prior-year balances to
the current year presentation.

                                       35


<PAGE>   36

3.  SWISS SUBSIDIARY

     On July 10, 1996, the Company established Modex Therapeutiques S.A.
("Modex") in Lausanne, Switzerland, to pursue extensions of the Company's
technology for certain applications outside the central nervous system. In
exchange for 50% of the then outstanding common shares of Modex, the Company
provided Sfr 2,400,000 (approximately $2,000,000) of debt and equity financing
and, subject to Modex achieving specified scientific milestones, committed to
invest an additional Sfr 2,400,000 in July 1998. The Company has granted Modex
an exclusive license to its technology for three applications, diabetes, obesity
and anemia, in return for royalty payments and the obligation to issue to Modex
up to 300,000 shares of the Company's Common Stock upon the achievement by Modex
of certain scientific milestones. Substantially all of these shares are expected
to be awarded by Modex as incentive compensation to Modex's founding scientists
and other researchers upon achievement of such milestones. In return, Modex
granted the Company an exclusive, royalty-bearing license to any technology
developed or obtained by Modex for application to diseases, conditions and
disorders which affect the central nervous system.

     In addition to the founders of Modex, who own 35% of the common equity and
include a member of the Company's Board of Directors, the other principal
investor, a private Swiss bank, provided cash and a convertible subordinated
note for Sfr 2,400,000 (approximately $2,000,000) for the remaining 15% equity
interest and are committed to invest an additional Sfr 1,200,000 in July 1998.
The note is due on the earlier of an initial public offering of the Modex common
stock or July 2006 and may be converted into the underlying 15% equity interest
at any time. The convertible subordinated note is non-interest bearing. So long
as there is no public market for Modex stock, the holder can require the Company
to purchase the note and equity in Modex for 90% of the fair value of the
underlying equity interest after July 1998, but before July 2006. Conversely, at
any time after July 1998, the Company may purchase the note and equity in Modex
for 110% of such fair value. Prior to July 1998, the Company may purchase the
note for the greater of Sfr 3,600,000 or Sfr 2,400,000 and 30% simple interest
thereon.

     At any time, the Company also has the right to acquire, and the Modex
founders have the right to sell to the Company, the founders' 35% equity
interest in exchange for the issuance of approximately 92,000 shares of the
Company's common stock.

     Any purchase made by the Company under any of the circumstances described
above may be made at the Company's option in cash or shares of the Company's
Common Stock valued at the quoted market price at the time of purchase. The
Company has included the operating results of Modex in the accompanying
consolidated financial statements since its inception and the resulting minority
interest has not been material.


                                       36
<PAGE>   37

4.   MARKETABLE SECURITIES

<TABLE>

     The following is a summary of available-for-sale securities:
<CAPTION>

                                                                                       December 31, 1996
                                                                                     Gross              Gross
                                                                                Unrealized         Unrealized             Estimated
                                                                   Cost              Gains             Losses            Fair Value
                                                            ------------------------------------------------------------------------
<S>                                                         <C>                    <C>               <C>                <C>
U.S. government securities ..............................   $ 2,007,823            $  --             $(14,023)          $ 1,993,800
U.S. corporate securities ...............................    21,651,507             28,784               --              21,680,291
                                                            ------------------------------------------------------------------------
Total debt securities ...................................   $23,659,330            $28,784           $(14,023)           23,674,091
Debt securities included in cash                            ==================================================
    and cash equivalents ........................................................................................          (988,236)
Debt securities included in                                                                                             -----------
    marketable securities .......................................................................................       $22,685,855
                                                                                                                        ===========
<CAPTION>

                                                                                        December 31, 1995
                                                                                      Gross             Gross
                                                                                 Unrealized        Unrealized             Estimated
                                                                   Cost               Gains            Losses            Fair Value
                                                            ------------------------------------------------------------------------
<S>                                                         <C>                    <C>               <C>                <C>
U.S. government securities ..............................   $ 2,011,235            $   --            $(18,535)          $ 1,992,700
U.S. corporate securities ...............................    33,499,056             150,021              --              33,649,077
                                                            ------------------------------------------------------------------------
Total debt securities ...................................   $35,510,291            $150,021          $(18,535)           35,641,777
Debt securities included in cash                            =================================================
    and cash equivalents ........................................................................................          (998,617)
Debt securities included in                                                                                             -----------
    marketable securities .......................................................................................       $34,643,160
                                                                                                                        ===========
</TABLE>

<TABLE>

Maturities of marketable securities held at December 31, 1996, are as follows:

<S>                                                                                                                     <C>
Less than one year ..............................................................................................       $21,680,291
One through five years ..........................................................................................         1,993,800
                                                                                                                        -----------
                                                                                                                        $23,674,091
                                                                                                                        ===========
</TABLE>

                                       37

<PAGE>   38


5.   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.

     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 $2,330,848 valuation
reserve to reduce the investment value to $200,000.


6.   PROPERTY, PLANT AND EQUIPMENT

<TABLE>
Property, plant and equipment consists of the following:

<CAPTION>

                                                               December 31,
                                                          1996           1995
                                                     ---------------------------
<S>                                                  <C>             <C>
Land ..............................................  $   278,774     $        --
Building and improvements .........................    6,207,679       6,434,043
Machinery and equipment ...........................    7,554,825       5,941,521
Furniture and fixtures ............................    1,424,907       1,224,122
Construction in progress ..........................    2,214,318              --
                                                     ---------------------------
                                                      17,680,503      13,599,686

Less accumulated depreciation and amortization ....    6,948,401       5,706,923
                                                     ---------------------------
                                                     $10,732,102     $ 7,892,763
                                                     ===========================
</TABLE>


     Depreciation and amortization expense was $1,564,000, $1,431,000 and
$1,578,000 for the years ending December 31, 1996, 1995 and 1994, respectively.

     Certain property, plant and equipment have been acquired under capitalized
lease obligations. These assets totaled $8,910,000, with related accumulated
amortization of $3,947,000 and $3,027,000 at December 31, 1996 and 1995,
respectively.

     In connection with the Company's new facility, the Company capitalized
$42,000 of interest costs in 1996.


                                       38
<PAGE>   39


7.   OTHER ASSETS

<TABLE>

Other assets are as follows:
<CAPTION>

                                                              December 31,
                                                        1996              1995
                                                   -----------------------------
<S>                                                <C>                <C>
Patents, net ....................................  $2,760,593         $2,119,965
Restricted cash .................................     497,956            784,632
Deferred financing costs, net ...................     297,698            147,121
Organizational costs, net .......................     156,183               --
Other investments ...............................     200,000            200,000
                                                   -----------------------------
                                                   $3,912,430         $3,251,718
</TABLE>
                                                   =============================

8.   ACCRUED EXPENSES

<TABLE>

Accrued expenses are as follows:

<CAPTION>
                                                              December 31,
                                                      1996                1995
                                                 -------------------------------
<S>                                              <C>                  <C>
Employee compensation .........................  $  824,910           $  761,650
External services .............................     537,605              776,995
Collaborative research ........................     413,497              367,772
Other .........................................     532,832              552,034
                                                 -------------------------------
                                                 $2,308,844           $2,458,451
                                                 ===============================
</TABLE>


9.   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 $478,000, until December 1999.


                                       39
<PAGE>   40


     The Company leases various office and research facilities and certain
equipment under noncancelable operating and capitalized leases. However, leases
relating to the majority of its office and research facilities are subject to
termination upon nine months' notification by the Company.

<TABLE>

Future minimum capitalized lease obligations with noncancelable terms in excess
of one year at December 31, 1996, are as follows:

<S>                                                                   <C>
1997 .............................................................    $  938,707

1998 .............................................................       753,788

1999 .............................................................       624,030

2000 .............................................................       607,518

2001 .............................................................       589,634

Thereafter .......................................................     4,079,005
                                                                      ----------

Total minimum lease payments .....................................     7,592,682

Less amounts representing interest ...............................     3,067,531
                                                                      ----------

Present value of minimum lease payments ..........................     4,525,151

Less current maturities ..........................................       553,557
                                                                      ----------

Capitalized lease obligations, less current maturities ...........    $3,971,594
                                                                      ==========
</TABLE>


Rent expense for the years ended December 31, 1996, 1995 and 1994, was $495,000,
$463,000 and $425,000, respectively.


10.  LONG-TERM DEBT

<TABLE>

Long-term debt is as follows:
<CAPTION>

                                                                                                               December 31,
                                                                                                      1996                   1995
                                                                                                   ---------------------------------
<S>                                                                                                <C>                    <C>
Convertible subordinated note (Sfr 2,400,000) ..................................................   $1,788,775             $       --

Facilities term note payable, interest at the prime rate plus 1/2% (8 3/4% at
December 31, 1996), due in 16 consecutive equal quarterly installments of 1/40
of total amount of loan commencing September 1997, with remaining balance due
October 2001; secured by the related facility and real estate ..................................    1,450,000                     --

Term note payable, interest at the prime rate plus 1/2% (83 /4% at December 31,
1996), due ratably through December 1998; secured by certain equipment .........................      867,227              1,263,458

Term note payable, interest at the prime rate plus 1/2% (8 3/4% at December 31,
1996), principal payments commence in August 1997, due ratably through May 2000;
secured by certain equipment ...................................................................      740,700                   --
Other ..........................................................................................       99,876                152,968
                                                                                                   ---------------------------------
                                                                                                    4,946,578              1,416,426
Current maturities of long-term debt ...........................................................      695,570                474,245
                                                                                                   ---------------------------------
Long-term debt, less current maturities ........................................................   $4,251,008             $  942,181
                                                                                                   =================================
</TABLE>

                                       40

<PAGE>   41


     The non-interest bearing, convertible subordinated note is due in July 2006
and is convertible into a 15% ownership interest in Modex Therapeutiques S.A.,
the Company's 50%-owned Swiss subsidiary. So long as there is no public market
for Modex stock, the holder can require the Company to purchase the note for 90%
of the fair value of the underlying equity interest after July 1998, but before
July 2006. Conversely, at any time after July 1998, the Company may purchase the
note for 110% of such fair value. Prior to July 1998, the Company may purchase
the note for the greater of (i) Sfr 3,600,000 or (ii) Sfr 2,400,000 and 30%
simple interest thereon.

     The facilities term note payable provides for borrowings up to $5.5 million
to finance the construction of the Company's new research and development
facility. Should the Company's unrestricted cash balances fall below specified
levels, the Company is required to provide cash collateral for up to 100% of the
outstanding loan balance.

     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.

<TABLE>

Maturities of long-term debt for the years ending December 31 are as follows:

<CAPTION>

<S>                                                                   <C>
1997 ..............................................................   $  695,570

1998 ..............................................................      859,383

1999 ..............................................................      391,900

2000 ..............................................................      268,450

2001 ..............................................................      942,500

Thereafter ........................................................    1,788,775
                                                                      ----------
                                                                      $4,946,578
                                                                      ==========
</TABLE>


     The carrying amount of the notes payable approximate their fair value. The
fair market value of the convertible subordinated note cannot be determined.

11.  REDEEMABLE COMMON STOCK

     Under a research agreement to fund development of products to treat
Parkinson's disease (see Note 13), Genentech purchased 829,171 shares of common
stock for $8.3 million in December 1996. 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
has the right to require the Company to repurchase shares of common stock having
a value equal to the amount of overfunding, 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, 1996,
$141,000 had been spent on the collaboration with Genentech and, accordingly,
the Company has reclassified those common shares and related value to
stockholders' equity.


                                       41

<PAGE>   42


12.  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 exercisable for ten years from
the date of grant or within three months of termination. At December 31, 1996,
the Company had reserved 3,086,388 shares of common stock for the exercise of
stock options.

<TABLE>

The following table presents the combined activity of its stock option plans for
the years ended December 31, as follows:

<CAPTION>
                                                      1996                            1995                            1994
                                            ----------------------------------------------------------------------------------------
                                                            Weighted                       Weighted                       Weighted
                                                             Average                        Average                        Average
                                              Options Exercise Price         Options Exercise Price         Options Exercise Price
                                            ----------------------------------------------------------------------------------------
<S>                                         <C>                <C>         <C>                <C>         <C>                <C>
Outstanding at
  January 1 ..............................  1,921,284          $7.72       1,480,844          $7.21       1,245,700          $6.56

Granted ..................................    852,160           9.48         678,604           8.35         632,665           8.86

Exercised ................................   (168,085)          5.83        (102,831)          4.54        (160,143)          9.78

Canceled .................................   (182,334)          9.42        (135,333)          7.77        (237,378)          8.73
                                            ----------------------------------------------------------------------------------------
Outstanding at
  December 31 ............................  2,423,025          $8.34       1,921,284          $7.72       1,480,844          $7.21
                                            ========================================================================================
Options exercisable
  at December 31 .........................  1,105,251          $7.11         839,260          $6.33         662,763          $5.36
                                            ========================================================================================
</TABLE>


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.

<TABLE>

     The following table presents weighted average price and life information
about significant option groups outstanding at December 31, 1996:

<CAPTION>

                                                                 Options Outstanding                        Options Exercisable
                                                  ----------------------------------------------------------------------------------
                                                                        Weighted
                                                                         Average          Weighted                         Weighted
                                                                       Remaining           Average                          Average
Range of                                               Number        Contractual          Exercise          Number         Exercise
Exercise Prices                                   Outstanding        Life (Yrs.)             Price     Exercisable            Price
- ----------------------------------------------    ----------------------------------------------------------------------------------
<S>                                                 <C>                     <C>             <C>          <C>                 <C>
Less than $5.00 ..............................        348,608               5.93            $ 2.03         287,138           $ 1.54

$5.01 - $10.00 ...............................      1,374,358               8.94              8.05         479,507             7.32

Greater than $10.00 ..........................        700,059               7.97             12.03         338,606            11.53
                                                    ---------                                            ---------
                                                    2,423,025                                            1,105,251
                                                    =========                                            =========
</TABLE>


                                       42
<PAGE>   43


<TABLE>

     Pursuant to the requirements of FAS 123, the following are the pro forma
net loss and net loss per share for 1996 and 1995, 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 1996 and 1995, consistent with
the provisions of FAS 123:

<CAPTION>
                                                               1996                                             1995
                                              --------------------------------------------------------------------------------------
                                               As Reported               Pro Forma              As Reported              Pro Forma
                                              --------------------------------------------------------------------------------------
<S>                                           <C>                      <C>                      <C>                     <C>
Net loss ..................................   $(13,759,138)            $(14,931,000)            $(8,891,239)            $(9,161,000)
Net loss per share ........................   $       (.89)            $       (.97)            $      (.69)            $      (.72)
</TABLE>

<TABLE>

     The weighted average fair value per share of options granted during 1996
and 1995 was $5.67 and $4.84, 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:
<CAPTION>

                                    Options                 Stock Purchase Plan
                              --------------------------------------------------
                                 1996       1995              1996       1995
                              --------------------------------------------------
<S>                            <C>        <C>                <C>        <C>
Expected life (years) ........  5          5                   .5         .5

Interest rate ................  6.5%       5.8%               5.4%       5.1%

Volatility ................... 63.0%      62.0%              63.0%      62.0%
</TABLE>


     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 the 1996 and 1995 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 and two 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 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 5,776,500 shares of common stock for the exercise
of options, warrants and other contingent issuances of common stock.


                                       43
<PAGE>   44


13.  RESEARCH AND DEVELOPMENT AGREEMENTS

     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 Parkinson's Agreement, Genentech purchased
829,171 shares of redeemable common stock for $8.3 million to fund development
of products to treat Parkinson's disease. Additional equity purchases and other
funding by Genentech may be available for future clinical development if agreed
by the parties. Upon commercialization, Genentech and the Company will share
profits from product sales in the United States at an agreed-upon percentage and
Genentech will pay the Company a royalty for product sales outside the United
States. The Company retained manufacturing rights for all products sold.

     The Company also licensed growth factors for the treatment of Huntington's
disease and for amyotrophic lateral sclerosis (ALS). Under the terms of the
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 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. These three
agreements supersede the 1994 Genentech collaboration in its entirety.

     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, and may
remit up to an additional $16,000,000 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 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. Terms of the agreement required the Company to make an initial
payment of $310,000 and provide NeuroSpheres additional research funding through
February 1998 based upon performance of certain obligations by NeuroSpheres.
Research expense under this agreement amounted to $291,667, $233,333 and
$125,000 for the years ended December 31, 1996, 1995 and 1994, respectively.
Upon the achievement of certain milestones, the Company must make payments to
NeuroSpheres totaling a maximum of $3,750,000, payable, at NeuroSpheres' option,
in cash or in shares of the Company's common stock at a price of $12.50 per
share. Upon commercial sale of a product utilizing the licensed technology, the
Company is obligated to pay a range of royalties, based on product revenues and
market share, plus certain minimum royalties. In order to maintain exclusivity,
the Company is also obligated to expend additional amounts to support research
related to dev elopment of products under the agreement. The Company and
NeuroSpheres are currently involved in arbitration proceedings intended to
resolve a dispute between the parties regarding the determination of stem cells
subject to exclusive license.

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 $1,337,000, $1,008,000 and $864,000, for the years ended
December 31, 1996, 1995 and 1994, respectively.


                                       44
<PAGE>   45


14.  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, 1996, the Company
had tax net operating loss carryforwards of $21,621,000 and research and
development tax credit carryforwards of $2,251,000 which expire at various times
through 2011. 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.

<TABLE>

Significant components of the Company's deferred tax assets and liabilities are
as follows:

<CAPTION>

                                                           December 31,
                                                     1996             1995
                                                 -------------------------------
<S>                                              <C>               <C>
Deferred tax assets:

  Capitalized research and development costs ... $ 21,286,000      $ 17,562,000

  Net operating losses .........................    8,648,000         6,020,000

  Research and development credits .............    2,251,000         1,921,000

  Other ........................................      316,000           419,000
                                                 -------------------------------
                                                   32,501,000        25,922,000
Deferred tax liabilities:

  Patents ......................................    1,096,000           694,000
                                                 -------------------------------
                                                   31,405,000        25,228,000

  Valuation allowance ..........................  (31,405,000)      (25,228,000)
                                                 -------------------------------
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, 1996 and 1995 to fully offset the Company's deferred tax assets.
The valuation allowance increased $6,177,000 in 1996, due primarily to the
increases in capitalized research and development costs, net operating loss
carryforwards and tax credits.

15.  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 $162,000, $131,000 and $114,000 for the years
ended December 31, 1996, 1995 and 1994, respectively.

16.  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.

17.  SUBSEQUENT EVENT

     In February 1997, the Company entered into a collaboration and development
agreement with Cognetix, Inc. to screen selected peptides for possible
development of therapeutic products using the Company's cell-based delivery
technology. Under the agreement, the Company expects to invest approximately
$1,750,000 over the next twelve months to acquire approximately a 19.9%
ownership position in Cognetix. 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.


                                       45

<PAGE>   46


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 Officers" in
the Company's definitive proxy statement for its 1997 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 1997 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 1997 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 1997 Annual Meeting of
Shareholders is hereby incorporated by reference.


                                       46
<PAGE>   47


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:

     Item                                                         Location
     ---------------------------------------------------------------------
     Schedule II Valuation and Qualifying Accounts                S-1

     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.

Exhibit No.    Title or Description

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.

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.

10.7A*         Letter Agreement dated March 19, 1992 between Registrant and
               Washington University.

10.8*          License Agreement dated March 16, 1989 between the 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.

10.17*         Agreement for Consulting Services dated March 16, 1989 between
               the Registrant and Dr. Pierre Galletti.

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.




                                       47

<PAGE>   48



10.23*         Agreement dated June 28, 1991 between the Registrant and TSI
               Mason Laboratories, Inc.

10.24*         Agreement dated December 5, 1991 between the Registrant and TSI
               Corporation.

10.25*         Agreement of Lease dated September 11, 1989 between the
               Registrant and Harold I. Schein, as amended by a Rider dated June
               8, 1990, a Rider dated November 13, 1990, a Rider dated October
               8, 1991, and a Rider dated October 10, 1991.

10.26*         Purchase and Sale Agreement between the Registrant and Guy
               Gregory for purchase of property and building at 6 Court Drive,
               Lincoln, Rhode Island.

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 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 A.G.

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.

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 Sandra
               Nusinoff Lehrman, M.D. 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 S.A.


                                       48

<PAGE>   49


10.58!!**      Cross License agreement dated as of July 10, 1996 between the
               Company and Modex Therapeutiques S.A.

10.59!!        Modex Therapeutiques S.A. stockholders voting agreement dated at
               of July 10, 1996 among Modex, the Company, the Societe Financiere
               Valoria S.A. 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 S.A.

10.62**        Development Collaboration and License Agreement Relating to
               Parkinson's Disease dated as of November 22, 1996 between
               Genentech, Inc. and Registrant.

10.63          Consulting Agreement dated as of December 1, 1996 between Peter
               Simon and the Registrant.

10.64          Term Loan Agreement dated as of October 22, 1996 between The
               First National Bank of Boston and Registrant.

23.1           Consent of Ernst & Young LLP.

99             Cautionary Factors Relevant to Forward-looking Information.


++             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 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 ending 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 ending September 30, 1996.


               (B)  CURRENT REPORTS ON FORM 8-K.

     On December 20, 1996, the Company filed a Report on Form 8-K with the
Securities and Exchange Commission describing the Genentech, Inc. arrangements.
See "Corporate Collaborations - Genentech, Inc."


                                       49
<PAGE>   50


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.

CYTOTHERAPEUTICS, INC.

By: /s/ Seth A. Rudnick, M.D.
    -------------------------------------
    Seth A. Rudnick, M.D.
    Chairman and Chief Executive Officer


Dated:   March 28, 1997


<TABLE>

     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.
<CAPTION>

Signature                                Capacity                                                 Date

<S>                                      <C>                                                      <C>
/s/ Seth A. Rudnick, M.D.                Chairman, Chief Executive Officer,                       March 28, 1997
- ------------------------------           and Director (principal executive officer)
Seth A. Rudnick, M.D.


/s/ Frederic A. Eustis, III              Acting Chief Financial Officer and Treasurer             March 28, 1997
- ------------------------------           (principal financial officer), Vice President,
Frederic A. Eustis, III                  General Counsel and Secretary


/s/ Suzanne L. Fleming                   Controller (principal accounting officer)                March 28, 1997
- ------------------------------
Suzanne L. Fleming


/s/ Patrick Aebischer, M.D.              Director                                                 March 28, 1997
- ------------------------------
Patrick Aebischer, M.D.


/s/ Edwin C. Cadman, M.D.                Director                                                 March 28, 1997
- ------------------------------
Edwin C. Cadman, M.D.


s/s Donald R. Conklin                    Director                                                 March 28, 1997
- ------------------------------
Donald R. Conklin


/s/ Sandra Nusinoff Lehrman              Chief Operating Officer, President                       March 28, 1997
- ------------------------------           and Director
Sandra Nusinoff Lehrman

/s/ Mark J. Levin
- ------------------------------           Director                                                 March 28, 1997
Mark J. Levin


/s/ Richard J. Ramsden                   Director                                                 March 28, 1997
- ------------------------------
Richard J. Ramsden


/s/ Peter Simon                          Director                                                 March 28, 1997
- ------------------------------
Peter Simon

</TABLE>


                                       50

<PAGE>   51

                                                                 SCHEDULE II
<TABLE>

                                                 VALUATION AND QUALIFYING ACCOUNTS
<CAPTION>

                                                                            
                                                      ------------------------------------------------------ 
                                                              Additions
                                                            ------------
                                 Balance at           Charged to     Charged to
                                beginning of          costs and         other                      Balance at
                                     year              expenses       accounts     Deductions      end of year
- ---------------------------------------------------------------------------------------------------------
<S>                               <C>               <C>                 <C>           <C>          <C>
Year Ended Dec. 31, 1996:

Other investments, net.........   $2,330,848                 0           0             0           $2,330,848       

Year Ended Dec. 31, 1995:

Other investments, net.........             0       $2,330,848           0             0           $2,330,848
</TABLE>





                                      S-1

<PAGE>   1
                                                                      

                            DEVELOPMENT COLLABORATION

                              AND LICENSE AGREEMENT


         This Agreement is made and entered into as of the 22nd day of November
1996 (the "Effective Date") by and between Genentech, Inc., a corporation
organized and existing under the laws of the State of Delaware ("Genentech"),
and CytoTherapeutics, Inc., a corporation organized and existing under the laws
of the State of Delaware ("CTI").

WHEREAS:

         Genentech has particular expertise in the areas of molecular biology,
production of monoclonal antibodies, assay development and the use of
recombinant DNA technology to construct mammalian cell lines capable of
producing various proteins useful in treating human disorders, including, NGF,
NT4/5, NT3, CT-1, Neurturin and other neurotrophic factors, and in developing
and commercializing products based on such proteins; and

         CTI has particular expertise in the area of cellular therapies based on
proprietary membrane encapsulation technologies and in the development and
application of implantable delivery systems for biologically active products for
the treatment of central nervous system disorders; and

         Genentech and CTI wish to develop products for the treatment of
Parkinson's Disease, initially using Neurturin, and potentially also using NGF,
NT3, NT4/5 and/or CT-1, all on the terms and conditions set forth herein.


                                       1
<PAGE>   2
NOW, THEREFORE, Genentech and CTI agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

1        CERTAIN DEFINITIONS.

         1.1 "ACCOUNTING PERIOD" shall mean (i) initially the period from the
date of First Commercial Introduction of a Licensed Product approved for sale by
an appropriate regulatory agency until the end of the first full calendar
quarter after the First Commercial Introduction occurred, and (ii) thereafter,
each subsequent calendar quarter.

         1.2 "AFFILIATE" shall mean any entity or person which controls, is
controlled by, or is under common control with Genentech or CTI. For purposes of
this Section 1.2, "control" shall mean in the case of corporate entities, the
direct or indirect ownership of greater than one-half (1/2) of the shares of
stock or participating shares entitled to vote for the election of directors.

         1.3 "BIOLOGICS LICENSE APPLICATION" shall mean a U.S. License
application for a well characterized biologic as provided under applicable U.S.
laws and regulations.

         1.4 "CLINICAL DEVELOPMENT EXPENSES" shall mean all expenses incurred
during development of Licensed Product(s) subsequent to analysis of the results
of the Initial Clinical Trial, as directed by the Development Committee,
including, without limitation, the costs of conducting ongoing research and
development directly related to obtaining regulatory approvals; conducting human
clinical trials other than the Initial Clinical Trial (including the cost of
Clinical Product for such trials); refining the design of the Licensed Product;
manufacturing process development and modifications fairly allocated to Licensed
Product; cell line research; cell banking; stability studies; toxicology,
carcinogenicity and immunology studies; developing QA/QC procedures and
obtaining regulatory approvals (as required by this Agreement). "Clinical


                                       2
<PAGE>   3
Development Expenses" shall not include any expenses included in "Development
Expenses", "Fully Burdened Manufacturing Cost", "Launch Expenses", "Phase IV
Clinical Trial Expenses", "Cost of Sales" or "Sales, General and Administrative
Expense", and in every case shall only include costs directly allocable to
Licensed Product in accordance with U.S. generally accepted accounting
principles consistently applied.

         1.5 "CLINICAL DEVELOPMENT PROGRAM" shall mean the program described in
Article IV of this Development Agreement.

         1.6 "CLINICAL PRODUCT" shall mean Licensed Product used in clinical
studies in humans.

         1.7 "COMMERCIAL PRODUCT" shall mean Licensed Product commercially sold
or used.

         1.8 "COMMON STOCK" shall mean CTI's common stock, par value $0.01 per
share.

         1.9 "COST OF SALES" shall be comprised of (i) cost of goods sold,
defined as Fully Burdened Manufacturing Cost, during such Accounting Period plus
any additional costs incurred in preparing the Licensed Product for commercial
sale or other disposition during such Accounting Period, (ii) royalties owed to
third parties by Genentech as a result of manufacture, use or sales of Licensed
Product (except for royalties included in Fully Burdened Manufacturing Cost) and
(iii) any other reasonable and customary expenses includable in this category of
costs in accordance with generally accepted accounting principles in the U.S.
The determination of the "Cost of Sales" shall be subject to approval by the
Finance Committee under Section 8.08. The foregoing shall be determined in
accordance with U.S. generally accepted accounting principles consistently
applied.

         1.10 "CT-1" shall mean the human protein cardiotrophin-1, having the
amino acid sequence set forth in Exhibit D-1 attached hereto, and any substitute
molecule to which the Parties mutually agree.

         1.11 "CTI KNOWHOW" shall mean all proprietary information, methods,



                                       3
<PAGE>   4
biological materials, processes, techniques and data, whether or not patentable,
owned, controlled or licensed by CTI, to the extent related to the manufacture,
use or sale of Licensed Product in the Territory and, in the case where licensed
by CTI, which CTI is free to transfer or disclose without violating contractual
obligations to third parties.

         1.12 "CTI PATENTS" shall mean (i) those United States patents and
patent applications listed on Exhibit A hereto, and any other patents or patent
applications throughout the world owned, or licensed by CTI with the right to
grant sublicenses, as of the Effective Date (except that the right to grant
sublicenses may be as of the Effective Date or at any future time) that are
necessary to make, have made, use or sell Licensed Product, (ii) any future
patents and patent applications throughout the world that CTI owns, or licenses
from a third party with the right to grant sublicenses (at any time) that are
necessary to make, have made, use or sell Licensed Product, (iii) all foreign
counterparts of United States patents and patent applications described in (i)
above, (iv) all patents that issue on applications described in (i), (ii) and
(iii) above, and (v) all substitutions, extensions (including patent term
extensions), reissues, renewals, divisions, continuations, and
continuations-in-part of any of the foregoing but only to the extent that with
respect to any such patent or patent applications described in clauses (i)
through (v) above, the licenses granted in this Agreement could not be practiced
without infringing such patent or patent application. "CTI Patents" shall
include, without limitation, CTI's rights under patents jointly owned pursuant
to Section 7.04.

         1.13 "DEVELOPMENT COMMITTEE" shall mean the committee organized and
acting pursuant to Article II of this Agreement.

         1.14 "DEVELOPMENT EXPENSES" shall mean all expenses incurred by CTI at
the direction of the Development Committee subsequent to the Effective Date, but
prior to the date, if any, that Genentech determines to initiate the Clinical
Development Program after the review under Section 4.05(b), including, without
limitation, the costs of conducting ongoing research and development directly
related to obtaining regulatory approvals, conducting the Initial Clinical Trial
(including the costs of Clinical Product for such trial); refining the design of
the Licensed Product; manufacturing process development and modifications fairly
allocated to Licensed Product; cell line research; and developing QA/QC
procedures. "Development Expenses" shall not



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include any expenses included in "Clinical Development Expenses", "Fully
Burdened Manufacturing Cost", "Launch Expenses", "Phase IV Clinical Trial
Expenses", "Cost of Sales" or "Sales, General and Administrative Expense", and
in every case shall only include costs directly allocable to Licensed Product in
accordance with U.S. generally acceptable accounting principles consistently
applied. The Development Expenses anticipated by the Parties are contained in
the budget attached to the Development Plan (Exhibit F).

         1.15 "DEVELOPMENT PROGRAM" shall mean the program described in Article
III.

         1.16 "ENCAPSULATION TECHNOLOGY" shall have the meaning set forth in
Exhibit B.

         1.17 "FACTOR(S)" shall mean Neurturin. Subject to Section 3.01, the
Parties may consider adding NGF, NT4/5, NT3 and/or CT-1 to the definition of
"Factor(s)" during the term of this Agreement.

         1.18 "FACTOR-BASED PATENTS" shall mean Genentech's right, title and
interest in those third party patents covering one or more Factor(s) and the DNA
encoding it or them or the use of any of the foregoing which are licensed by
Genentech, which Genentech has the right to sublicense, and which, in the
absence of such license, would be infringed by the manufacture, use or sale of
Licensed Product.

         1.19 "FDA" shall mean the U.S. Food and Drug Administration.

         1.20 "FIELD OF USE" shall mean the treatment of Parkinson's Disease
[ * ]  but shall not include  [ * ]. For the purposes of this Agreement, [ * ]

         1.21 "FIRST COMMERCIAL INTRODUCTION" shall mean the date of the first
commercial sale to an independent third party by Genentech or a permitted
sublicensee of Genentech of a Licensed Product following approval of a
Submission.


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         1.22 "FULLY BURDENED MANUFACTURING COST" shall mean the actual cost of
the production of either Clinical Product or Commercial Product, as the case may
be, which shall be comprised of the sum of (a) the cost of goods produced as
determined in accordance with U.S. generally accepted accounting principles as
consistently applied by CTI, including, but not limited to, direct labor,
packaging, and material and product testing costs incurred in connection with
the manufacture or quality control testing of Clinical Product or Commercial
Product, startup and validation costs associated with manufacturing capacity
under this Agreement incurred prior to the first approval of a Submission for a
Licensed Product, as well as overhead and amortized capital depreciation
allocated in accordance with U.S. generally accepted accounting principles as
consistently applied by CTI, and (b) all royalties (earned or paid up) payable
to third parties under license(s) taken by CTI to patents or patent applications
that, but for such license(s), would be infringed by the manufacture of Licensed
Product. The determination of "Fully Burdened Manufacturing Cost" shall be
subject to review by the Finance Committee under Section 8.08. In the case of
any paid-up licenses, the cost of such licenses shall be fairly allocated
between Licensed Product and other product(s) giving rise to payment obligations
under such license.

         1.23 "GENENTECH KNOWHOW" shall mean all proprietary information,
methods, biological materials, processes, techniques and data, whether or not
patentable, owned, controlled or licensed by Genentech to the extent related to
the manufacture, use or sale of Licensed Product and, in the case where licensed
by Genentech, which Genentech is free to transfer or disclose without violating
contractual obligations to third parties.

         1.24 "GENENTECH PATENTS" shall mean (i) those United States patents and
patent applications listed on Exhibit C hereto, and any other patents or patent
applications throughout the world owned, or licensed by Genentech with the right
to grant sublicenses as of the Effective Date (except that the right to grant
sublicenses may be as of the Effective Date or at any future time) that are
necessary to make, have made, use or sell Licensed Product, (ii) any future
patents and patent applications throughout the world that Genentech owns, or
licenses from a third party with the right to grant sublicenses (at any time),
that are necessary to make, have made, use or sell Licensed Product, (iii) all
foreign counterparts of United States patents and patent applications described
in (i) above, (iv) all patents that issue on applications described in (i), (ii)
and (iii) above, and (v) all substitutions, extensions (including patent term



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extensions), reissues, renewals, divisions, continuations, and
continuations-in-part of any of the foregoing, but only to the extent that with
respect to any such patent or patent applications described in clauses (i)
through (v) above, the licenses granted in this Agreement could not be practiced
without infringing such patent or patent application. "Genentech Patents" shall
include, without limitation, the Factor-Based Patents and Genentech's rights
under patents jointly owned pursuant to Section 7.04.

         1.25 "INITIAL CLINICAL TRIAL" shall mean the initial clinical trial of
Licensed Product as referred to in Exhibit F.

         1.26 "KNOWHOW" shall mean CTI Knowhow or Genentech Knowhow, or both or
either, as the context requires.

         1.27 "LAUNCH EXPENSES" shall mean promotional and training expenses
incurred by Genentech or its permitted sublicensees for the period from [ * ]
of such market launch. All such "Launch Expenses" shall be included to the
extent directly allocable to Licensed Product in accordance with U.S. generally
accepted accounting principles consistently applied, subject to approval by the
Finance Committee under Section 8.08.


         1.28 "LICENSED PRODUCT" shall mean any product of commercial value or
utility in the Field of Use which contains mammalian cells producing one or more
Factor(s), which cells are encapsulated through use of the Encapsulation
Technology.

         1.29 "MAJOR MARKET COUNTRY" shall mean, in the singular, any of France,
Germany, Italy, the United Kingdom or the United States, and, in the plural, all
of such countries.

         1.30 "NET PROFIT" shall mean for each Accounting Period, Net Sales in
that Accounting Period less the sum of the Cost of Sales, and Sales, General and
Administrative Expense (including Launch Expenses and Phase IV Clinical Trial
Expenses) during such Accounting Period. To the extent that minimum purchases of
Licensed Product by Genentech pursuant to Section 4.06 are not included in Cost
of Sales by expiration of product life, the cost of such purchases shall also be
subtracted from Net Sales for the purpose of calculating Net Profit; provided,
however, that if the


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Licensed Product so purchased is subsequently sold, the cost so subtracted shall
be added back to Net Profit. Such calculation shall not take into account income
tax. However, the foregoing shall not be intended to double-count such purchases
for purposes of Net Profits.

         1.31 "NET SALES" shall mean as to each Accounting Period, the gross
invoiced sales price charged for all Licensed Products sold or commercially
disposed of for value by Genentech or any of its permitted sublicensees in arm's
length sales to independent third parties in that Accounting Period, after
deduction of the following items incurred by Genentech or any of its permitted
sublicensees during such Accounting Period with respect to sales of Licensed
Products hereunder regardless of the Accounting Period in which such sales were
made, provided that such items are included in the price charged, and do not
exceed reasonable and customary amounts in the market in which such sale
occurred:

         (i) trade, cash and quantity discounts or rebates actually taken or
allowed;

         (ii) credits or allowances given or made for rejection or return of,
and for uncollectible amounts on, previously sold Licensed Products or for
retroactive price reductions;

         (iii) any tax or government charge (including any tax such as a value
added or similar tax or government charge other than an income tax) levied on
the sale, transportation or delivery of a Licensed Product and borne by the
seller thereof; and

         (iv) any charges for freight or insurance billed to the final customer.

If a Licensed Product is sold, leased or otherwise commercially disposed of for
value in a transaction that is not an arm's length transaction with an
independent third party, and is not for resale, etc. to an independent party in
an arm's length transaction, then the gross sales price in such transaction
shall be deemed to be the greater of the actual sales price or the gross sales
price in the most similar substantially contemporaneous arm's length transaction
with an independent third party for such Licensed Product, or if there is none,
for the most similar Licensed Product for which there is such a transaction.




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         1.32 "NEURTURIN" shall mean the human protein Neurturin, having the
amino acid sequence set forth in Exhibit D-2 attached hereto, and any substitute
molecule to which the Parties mutually agree.

         1.33 "NEURTURIN MTA" shall mean that certain Material Transfer
Agreement dated as of [ * ]. For purposes of this Agreement, the Neurturin
MTA is hereby incorporated herein in its entirety by this reference, and in the
event of any conflict between the terms of the Neurturin MTA and this Agreement,
the terms of the Neurturin MTA shall govern.

         1.34 "NEW DRUG APPLICATION" shall mean a U.S. license application for a
drug product under applicable U.S. laws and regulations.

         1.35 "NGF" shall mean the human protein nerve growth factor, having the
amino acid sequence set forth in Exhibit D-4 attached hereto, and any substitute
molecule to which the Parties mutually agree.

         1.36 "NGF AGREEMENT" shall mean that certain Development Collaboration
and License Agreement, dated as of February 1, 1994, between the Parties.

         1.37 "NT3" shall mean the human protein neurotrophin 3, having the
amino acid sequence set forth in Exhibit D-5 attached hereto, and any substitute
molecule to which the Parties mutually agree.

         1.38 "NT 4/5" shall mean the human protein neurotrophin factor 4/5,
having the amino acid sequence set forth in Exhibit D-3 attached hereto, and any
substitute human molecule to which the Parties mutually agree.

         1.39 "PARKINSON'S DISEASE" shall mean the disease in humans known as
Parkinson's disease and any related syndromes or symptoms. Parkinson's disease
is an idiopathic, progressive, neurodegenerative disorder characterized
clinically by resting tremor, rigidity, slowness of movement (bradykinesia),
paucity of movement (hypokinesia) and degeneration of dopaminergic neurons in
the substantia nigra and/or their projections into the striatum.


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         1.40 "PARTY" shall mean Genentech or CTI and, when used in the plural,
shall mean both Genentech and CTI.

         1.41 "PATENT RIGHTS" shall mean CTI Patents and Genentech Patents, or
either, as the context may require.

         1.42 "PHASE II CLINICAL DEVELOPMENT EXPENSES" shall mean all Clinical
Development Expenses incurred by CTI or its permitted sublicenses from
[ * ].

         1.43 "PHASE III CLINICAL DEVELOPMENT EXPENSES" shall mean all Clinical
Development Expenses incurred by CTI or Genentech or their respective permitted
sublicensees [ * ] for Licensed Product in each of the United States, all
countries of the European Union and Japan.

         1.44 "PHASE II CLINICAL TRIAL" shall mean a clinical trial in humans of
a Licensed Product designed to confirm initial safety data and provide initial
efficacy data which provides the basis for a Phase III Clinical Trial in the
United States; Phase II Clinical Trial(s) are expected to be conducted prior to
any Phase III Clinical Trial.

         1.45 "PHASE III CLINICAL TRIAL" shall mean a trial in humans of both
the safety and efficacy of a Licensed Product for a specific indication or
indications in patients having the disease or condition under study directed
toward receipt of approval by the appropriate regulatory authority for marketing
of such Licensed Product for such specific indication or indications.

         1.46 "PHASE IV CLINICAL TRIAL EXPENSES" shall mean all costs and
expenses incurred by Genentech or its permitted sublicensees associated with any
clinical trial of a Licensed Product after the first approval of a Submission by
the FDA for such Licensed Product where such trial is required by the FDA. All
such "Phase IV Clinical Trial Expenses" shall be included to the extent directly
allocable to Licensed Product in accordance with U.S. generally accepted
accounting principles consistently applied, subject to approval by the Finance
Committee under Section 8.08.


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         1.47 "SALES, GENERAL AND ADMINISTRATIVE EXPENSE" shall mean all costs
incurred for the sales and marketing of a Licensed Product and for all related
general, administrative and other matters not a part of Cost of Sales, in
accordance with U.S. generally accepted accounting principles consistently
applied, subject to approval by the Finance Committee under Section 8.08.
"Sales, General and Administrative Expense" shall include expenses included in
"Launch Expenses" and "Phase IV Clinical Trial Expenses".

         1.48 "STOCK PURCHASE AGREEMENT" shall mean the agreement attached as
Exhibit E.

         1.49 "SUBMISSION" shall mean the submission to an appropriate
regulatory authority (such as the FDA) of appropriate applications seeking
approval of the marketing and, when appropriate, approval of the pricing, of a
Licensed Product, e.g., an "NDA" or a "BLA".

         1.50 "TERRITORY" shall mean all the countries of the world.

         1.51 "U.S. PHASE III CLINICAL DEVELOPMENT EXPENSES" shall mean all
Phase III Clinical Development Expenses incurred for clinical development of
Licensed Product(s) by CTI or Genentech or their respective permitted
sublicensees for approval to market and sell Licensed Products in the United
States.

         It is the intent of the Parties that "U.S. Phase III Clinical
Development Expenses" shall only include those clinical expenses necessary for
obtaining approval(s) to market and sell Licensed Products in the United States.

         1. 52 "U.S. PHASE III CLINICAL TRIAL" shall mean a Phase III Clinical
Trial in the United States.

         1.53 "20 DAY AVERAGE" shall mean, in each instance, a price per share
equal to the average  [ * ]  agreed on by the Parties (as evidenced by this
Agreement, the Stock Purchase Agreement or other mutual written agreement of the
Parties) of the average of each day's high and low price per share of CTI's
Common Stock in the NASDAQ National Market System or, if not there quoted, on a
national


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securities market or exchange on which CTI is then traded and agreed upon by the
Parties.

                                   ARTICLE II

                              DEVELOPMENT COMMITTEE

         2.01 CREATION OF THE DEVELOPMENT COMMITTEE. The Parties hereby agree to
the creation of a Development Committee which shall consist of three
representatives of each Party. Within sixty (60) days following the Effective
Date, each Party shall notify the other Party of its initial appointees to the
Development Committee. Each Party shall be free to change its representatives
upon written notice to the other Party.

         2.02 MEETINGS. So long as the development collaboration activities set
forth in Articles III and IV are on-going or contemplated by the Parties, the
Development Committee shall meet regularly at least once a quarter, unless
otherwise agreed by the members of the Development Committee. Additional
meetings may be called by either Party on 10 days' notice to the other and,
unless otherwise agreed, all meetings shall alternate between the offices of the
Parties.

         2.03 DUTIES. Subject to the other terms of this Agreement (including,
without limitation, Section 4.05), the Development Committee shall be
responsible for directing the Development Program and Clinical Development
Program, making the decisions it is required to make pursuant to the terms of
this Agreement and making recommendations to the Parties regarding other
decisions necessary or appropriate to implement this Agreement (including,
without limitation, adjustments to the budget in case of expenses necessary for
work not originally contemplated by the budget, but later agreed upon by the
Parties).

         All decisions and recommendations of the Development Committee shall
require the agreement of a majority of the representatives of each Party to be
effective. In the event the representatives of the two Parties cannot agree on a
matter, the vote of the Genentech representatives shall decide matters except
that (i) the vote of the CTI representatives shall decide matters [ * ] and
(ii) both


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Parties shall [ * ] after its commencement (and assuming that Genentech has
determined that it should commence, after the review under Section 4.05(c)). If
one Party objects to such a decision made by the representatives of the other
Party, a member of senior management of each Party shall confer and resolve the
dispute. For this purpose, a "member of senior management" shall be a
management-level employee who has the authority to bind a Party. If the members
of senior management do not resolve such dispute within 60 days of such
objection, the Parties shall attempt to resolve such dispute in accordance with
Sections 11.19 and 11.20.

         Any material decision of the Development Committee (e.g., budget and/or
timeline for approvals) shall be reduced to a writing agreed to by both Parties.

                                   ARTICLE III

                               DEVELOPMENT PROGRAM

         3.01. OBJECTIVES OF THE PARTIES. The Parties agree that the goal under
this Agreement is the development of Licensed Products. The initial Factor to be
investigated shall be Neurturin. The Parties may agree on investigating other
Factor(s) in addition to or instead of Neurturin, based on the data and results
arising from the "Development Plan" (as defined below) for Licensed Product
containing Neurturin as the only Factor. If the Parties agree on Factor(s) in
addition to or other than Neurturin for the definition of "Factor(s)," they
shall so indicate in a writing signed by both Parties.

         The Parties further agree that the Development Program consists of the
development plan attached hereto as Exhibit F (the "Development Plan"), which
includes, among other items, the primate efficacy study and large animal study
described therein and the Initial Clinical Trial. The Development Committee
shall revise the work comprising the Development Program from time to time as
necessary, including, if agreed, to reflect development of Licensed Products in
addition to or other than Licensed Products containing only Neurturin as a
Factor. If the Parties decide to develop Licensed Products beyond Licensed
Product containing only Neurturin as a Factor, they shall agree on a
"Development Plan" for such Licensed Product(s), including a budget and time
line.


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         In the case of any conflict between the Development Plan and this
Agreement, the provisions of this Agreement shall control.

         3.02 INITIAL DEVELOPMENT OBLIGATIONS OF CTI. CTI agrees to contribute
the following materials and to commit the time and efforts of the number of its
full-time equivalent research staff set forth in the Development Plan to use
their reasonable best efforts to accomplish the following for Neurturin and, if
relevant, any other Factor(s) which the Parties agree upon under Section 3.01,
consistent with the plans of the Development Committee:

         (i)      determine the [ * ] in a large animal model;

         (ii)     develop a cell line(s) producing the relevant Factor(s) for
                  clinical development which is suitable for master cell banking
                  and which has been approved by the Development Committee;

         (iii)    encapsulate the cell line(s) producing the relevant Factor(s)
                  and, as the following are required to meet requirements of the
                  FDA and other applicable regulatory agencies, provide:
                  documentation regarding the stability of production of such
                  Factor(s), the extent of such Factor(s) release and the
                  release of non-Factor proteins and other biomolecules by the
                  encapsulated cell line(s) and lack of contamination of such
                  encapsulated cell line by viruses, prions and bacteria;

         (iv)     conduct pre-clinical development activities, including animal
                  experiments and IND-enabling toxicology, safety and
                  pharmacokinetic studies, as directed by the Development
                  Committee;

         (v)      file a U.S. IND or other appropriate regulatory application(s)
                  to conduct the Initial Clinical Trial;

         (vi)     conduct the Initial Clinical Trial; and

         (vii)    pay for all Development Expenses (except for internal
                  Genentech costs incurred pursuant to Section 3.03).


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         CTI shall keep the Development Committee informed of the identities of
the CTI research staff members who are committed to the Development Program and
shall provide documentation of expenses as requested by the Development
Committee. Genentech shall have the right one time annually, upon written
request and after reasonable notice, to audit the time allocations of the
research staff committed to the Development Program and other documentation of
expenses incurred.

         3.03 INITIAL DEVELOPMENT OBLIGATIONS OF GENENTECH. Genentech agrees to
contribute the following and to use its reasonable best efforts to accomplish
the following for Neurturin and, if relevant, any other Factor(s) which the
Parties agree on under Section 3.01, consistent with the plans of the
Development Committee:

         (i)      supply antibodies (monoclonal and polyclonal), cDNA and/or
                  genomic clones, plasmids, protein(s), ELISA and other assay
                  materials and methods, provided such materials and methods are
                  within the Genentech Knowhow and relate to the Factor(s)
                  currently under development hereunder;

         (ii)     provide funding in the form of an equity investment within 30
                  days of the date of execution of this Agreement by both
                  Parties, as set forth in Section 8.01;

         (iii)    assist, as reasonably requested by CTI, with experimental
                  design and evaluation and, [ * ] of injected animals;

         (iv)     assist, as reasonably requested by CTI, with the selection and
                  optimization of the cell line(s) producing relevant Factor(s)
                  to be used in Licensed Products; and

         (v)      assist, as reasonably requested by CTI, in CTI's filing of
                  regulatory applications (as described in Section 3.02 (v)) by
                  allowing CTI to cross reference or otherwise get the benefit
                  of relevant Genentech regulatory filings, if any.


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         3.04 TERM OF DEVELOPMENT PROGRAM. Unless otherwise agreed in writing by
the Parties, the Development Program shall have a duration of [ * ]. At the
earlier of the end of the term of the Development Program or the completion of
the Initial Clinical Trial, Genentech will decide whether to continue the
Development Program, proceed to the Clinical Development Program, or terminate
the program, all as provided in Section 4.05.

                                   ARTICLE IV

                          CLINICAL DEVELOPMENT PROGRAM

         4.01 OBJECTIVES OF CLINICAL DEVELOPMENT PROGRAM. The Parties agree that
the "Clinical Development Program" includes, among other items, all human
clinical studies of Licensed Products directed toward approval of a Submission
in the United States (after the Initial Clinical Trial), manufacturing scale-up
and other work to develop and commercialize Licensed Products. The Parties agree
that the success of the Clinical Development Program depends on the achievement
of the following objectives:

         (i)      performing any further pre-clinical studies required to
                  complete the comprehensive data package necessary to make
                  regulatory filings;

         (ii)     scaling up the manufacturing process so that it can be used to
                  make Clinical Product and Commercial Product;

         (iii)    performing clinical studies designed to obtain regulatory
                  approval for the sale of Licensed Product(s); and

         (iv)     filing Submissions to obtain approvals to market and sell
                  Licensed Products, provided that the product labeling for all
                  Licensed Product shall be in the name of Genentech or as
                  Genentech or its permitted sublicensees may reasonably
                  designate (consistent with applicable law and regulation).
                  Each Party agrees to take such further actions as to
                  regulatory matters as are appropriate and reasonably requested
                  by the other Party to carry out the purposes of this Agreement
                  (including, without limitation, adjusting the name of the
                  Party(s) in which regulatory filings


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                  are made).

         The Parties further agree that the initial goal of the Clinical
Development Program is to file Submissions to gain approvals to market and sell
Licensed Product in the Major Market Countries, in each case, as soon as is
commercially and technically reasonable from the date of the decision of
Genentech, if any, to continue the Clinical Development Program after the Phase
II Clinical Trial after the review pursuant to Section 4.05(c).

         4.02 OBLIGATIONS OF GENENTECH IN THE CLINICAL DEVELOPMENT PROGRAM.
Genentech shall provide the following assistance and be responsible for the
following items in the conduct of the Clinical Development Program:

         (i)      perform and pay for clinical studies designed to obtain
                  regulatory approval for the sale of Licensed Product(s)
                  outside the United States;

         (ii)     make regulatory filings in the name of Genentech (or its
                  permitted sublicensees) with regulatory authorities to obtain
                  approvals to market and sell Licensed Products outside the
                  United States;

         (iii)    be responsible for all regulatory matters with respect to
                  Licensed Products outside the United States, subject to
                  Sections 4.01(iv) and 4.03(vi);

         (iv)     provide financing for CTI, if needed, pursuant to Section
                  4.07;

         (v)      assist, as reasonably requested by CTI, in CTI's filing of
                  regulatory applications (as described in Section 4.01(iv)) by
                  allowing CTI to cross reference or otherwise get the benefit
                  of relevant Genentech regulatory filings, if any, solely for
                  use in connection with the development or manufacture of
                  Licensed Product; and

         (vi)     conduct and pay for any Phase IV Clinical Trials, subject to
                  the other terms of this Agreement relating to sharing of Net
                  Profits.


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         4.03 OBLIGATIONS OF CTI IN THE CLINICAL DEVELOPMENT PROGRAM. CTI shall
provide the following assistance and be responsible for the following items in
the conduct of the Clinical Development Program as set forth in the Development
Plan:

         (i)      upon Genentech's decision(s), if any, to proceed with the
                  Clinical Development Program after the reviews pursuant to
                  Sections 4.05(b) and 4.05(c), conduct Phase II Clinical
                  Trial(s) and U.S. Phase III Clinical Trial(s) as directed by
                  the Development Committee;

         (ii)     pay all Phase II Clinical Development Expenses pursuant to
                  Section 4.07(b);

         (iii)    pay [ * ] of U.S. Phase III Clinical Development Expenses
                  pursuant to Section 4.07(c);

         (iv)     be responsible for all regulatory matters with respect to
                  Licensed Product in the United States, pursuant to Section
                  4.01 (iv) above;

         (v)      develop a commercial-scale manufacturing process to produce
                  Clinical Product and then Commercial Product for the first
                  U.S. Phase III Clinical Trial at a time that is mutually
                  agreed upon by both Parties, but no later than [ * ] after
                  Genentech commits, if at all, to commence the first Phase III
                  Clinical Trial after the review pursuant to Section 4.05(c);
                  and

         (vi)     assist, as reasonably requested by Genentech or its permitted
                  sublicensees, in filing of regulatory applications (as
                  described in Sections 4.01(iv)) by allowing Genentech and its
                  permitted sublicensees to cross reference or otherwise get the
                  benefit of relevant CTI regulatory filings, if any, solely for
                  use in connection with the development, use or sale of
                  Licensed Product.

         Each Party shall keep records of all Clinical Development Expenses
incurred by it and shall provide the other Party with a reasonably detailed
accounting setting forth such Clinical Development Expenses within sixty (60)
days of the end of each calendar quarter during which such expenses are
incurred. Each Party shall have the


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right, one time annually, upon written request and after reasonable notice, to
audit the other Party's records of its Clinical Development Expenses.

         Neither CTI nor Genentech shall be responsible for expenses incurred by
the other Party not in the agreed-upon budgets for Clinical Development
Expenses.

         4.04 SHARING OF DATA. Each Party shall promptly and thoroughly disclose
to the other all information and data relating to Licensed Products (but
excluding information regarding fiber or implant manufacture and any Factor(s)
not currently under development hereunder) resulting from any activities
undertaken as a result of the Development Program or the Clinical Development
Program. In addition, each Party shall promptly disclose to the other Party all
safety and toxicity information it obtains on the Factor(s) currently under
development hereunder from human clinical studies or pre-clinical studies (where
such clinical or pre-clinical data is or should, under applicable laws and
regulations, be filed as part of a U.S. IND or as part of a subsequent
regulatory document including a Submission). Absent agreement to the contrary,
all such information and data shall be considered Genentech or CTI Knowhow, as
the case may be, and held confidential pursuant to Section 9.01.

         4.05 REVIEW OF RESULTS; GENENTECH RIGHTS. The Parties shall review the
results of each of the following promptly upon completion of the following:

         (a)      The [ * ] (as each are described in the Development Plan);

         (b)      The Initial Clinical Trial; and

         (c)      The first Phase II Trial which will allow the Parties to meet
                  with the FDA to discuss the first U.S. Phase III Clinical
                  Trial.

Genentech shall have the right in its sole discretion to decide whether or not
the Parties shall continue the development of Licensed Product hereunder, after
each of the reviews set forth in clauses (a), (b) and (c) above; as provided in
Section 2.03 above, after a Genentech decision (if any) to proceed forward after
the review under Section 4.05(c), both Parties shall have an equal vote in
decisions affecting a U.S. Clinical Phase III Trial. If Genentech decides to
continue the development of Licensed


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<PAGE>   20
Product after each of the reviews referred to above, the Parties shall proceed
with the Development Program (in the case of (a)) or the Clinical Development
Program (in the case of (b) and (c)). If Genentech decides not to proceed with
the Development Program and Clinical Development Program, as the case may be,
the Parties shall in good faith consider alternatives, including without
limitation, modifying the Development Program and Clinical Development Program
and/or licensing CTI to make, use and sell Licensed Product, or terminating this
Agreement under Section 10.06(a). Notwithstanding the foregoing, Genentech shall
not be obligated to grant CTI a license. If the Parties do not agree to work
together further as provided in Section 10.06(a), either Party shall have the
right to terminate this Agreement pursuant to Section 10.06(a).

         4.06 SUPPLY AGREEMENT. Genentech and CTI shall negotiate in good faith
a supply agreement for Clinical Product for Genentech and its permitted
sublicensees for clinical trials outside the United States at such time as
Genentech believes it is appropriate but no later than [ * ] after a decision
by Genentech, if any, under Section 4.05(b) to proceed with the Clinical
Development Program (the "Clinical Supply Agreement") and a supply agreement for
Commercial Product for Genentech and its permitted sublicensees (the "Commercial
Supply Agreement") at such time as the Development Committee believes it is
appropriate, provided that negotiations for the Commercial Supply Agreement
shall begin no later than the commencement of the first Phase II Clinical Trial
and conclude no later than [ * ] prior to the expected commencement of the
first Phase III Clinical Trial. The Parties shall use their best efforts to
conclude the Clinical Supply Agreement within 90 days after Genentech's
decision, if any, under Section 4.05(b) to proceed forward with the Clinical
Development Program. CTI shall have the obligation to supply Genentech and its
permitted sublicensees as provided herein and in such supply agreements. For
purposes of this Agreement and each Supply Agreement, for supply of Clinical
Product and Commercial Product by CTI to Genentech and its permitted
sublicensees, CTI shall be entitled to CTI's Fully Burdened Manufacturing Cost
for such Clinical Product, and, commencing with the First Commercial
Introduction of the Licensed Product that is such Commercial Product, CTI's
Fully Burdened Manufacturing Cost for such Commercial Product. The parties
recognize that as part of such supply, there will be risks due to carrying
inventory. Inside the United States, the Parties will apportion that inventory
risk in proportion to the relevant profit participation of each Party pursuant
to Sections 8.02 and 8.04. Outside the United States, such inventory risk

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<PAGE>   21
shall be borne by Genentech pursuant to Sections 8.03 and 8.04. For these
purposes, "inventory risk" shall be the risk of loss for Licensed Product
subsequent to delivery of such Licensed Product to Genentech pursuant to a
binding purchase order from Genentech.

         At the time the Parties begin to negotiate the Commercial Supply
Agreement, they shall negotiate and agree in good faith a cap on both CTI's
Fully Burdened Manufacturing Costs and Genentech's Sales, General and
Administrative Expense. If either Party subsequently determines in good faith
that its costs for these items will exceed the agreed upon cap, subject to
review and approval by the Finance Committee, the Parties shall agree in writing
to adjust the cap upward to equal the actual costs, for the period of time in
which they exceed that cap.

         At the time the Parties enter into either Supply Agreement, they shall
discuss whether and under what terms Genentech may purchase a joint ownership
interest in the facilities producing Licensed Product.

         In addition to the above terms, the Commercial Supply Agreement shall
contain a provision setting forth the minimum purchases that Genentech and its
permitted sublicensees (in the aggregate) shall be required to make thereunder
and the minimum supply capacity CTI must maintain to supply Licensed Product
hereunder. Genentech, on behalf of itself and its permitted sublicensees, shall
make first estimates (based on market projections) for purposes of required
minimum purchases at the time of Genentech's entering into the Supply Agreement,
and annually thereafter. CTI intends to use such estimates to determine the
capacity of the plant it must build. Accordingly, CTI will not be required to
produce more than [ * ] but shall be required to produce at least [ * ], of
Genentech's purchase estimate, on behalf of itself and its permitted
sublicensees, made closest to, but not less than, 18 months prior to First
Commercial Introduction for each of the first three years that it supplies
Commercial Product to Genentech and its permitted sublicensees. Actual purchases
of Licensed Product supplied by CTI shall be pursuant to firm purchase orders
from Genentech, but for purposes of maintaining the foregoing capacity
protections for each Party in the Commercial Supply Agreement the Parties shall
agree upon appropriate percentages beyond which such firm orders for supply of
Licensed Product may not vary (above or below) the [ * ] range of the previously
provided estimates, and CTI shall be obligated to supply, and Genentech (on
behalf of itself and its permitted sublicensees)


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<PAGE>   22
shall be obligated to purchase at least [ * ] of amounts of Licensed Product
under such firm purchase orders in accordance with the foregoing and the
"inventory risk" provisions set forth above in this Section 4.06. Genentech
shall be permitted to revise its minimum purchase projections yearly, but such
revision shall not affect the maximum amount of Commercial Product CTI must
supply for the first three years. The Supply Agreement shall also provide for
good faith, rolling forecasts covering a time period of at least 24 months with
maximum supply obligations determined so as to allow Genentech and its permitted
sublicensees to meet market needs and allow CTI reasonable time to build,
validate and obtain approval of necessary facilities to supply Licensed Products
in the Territory. The Supply Agreement shall contain a provision to protect CTI
against idle plant capacity after expansion of such facilities, to the extent
such facilities were built to supply such Licensed Product (with reasonable
apportionment where other parties, including CTI, are also supplied by such
plant capacity). The Supply Agreement shall provide that CTI shall treat
Genentech and its permitted sublicensees as CTI's highest priority customer for
supply of Licensed Product, and shall provide for flexibility for Genentech and
its permitted sublicensees to change purchase orders and require CTI to promptly
replace non-conforming or otherwise defective product supplied thereunder.

         In addition, each Supply Agreement shall contain provisions regarding
breach similar to those set forth in this Agreement, including those governing
the transfer of manufacturing technology from CTI to Genentech for manufacture
of Licensed Product in the Territory and shall provide that a breach under such
Supply Agreement shall be a breach hereunder. During the period of such a
transfer, CTI shall continue to treat Genentech on behalf of it and its
permitted sublicensees as its highest priority customer for supply of Licensed
Product. The Parties agree that the technology transfer will involve the need
for CTI employees to train Genentech employees. CTI will pay the salaries of its
employees doing such training, and Genentech will pay the salaries of its
employees receiving such training as well as all expenses incurred in
constructing a Genentech facility for producing Licensed Product.

         4.07 (a) FUNDING OF DEVELOPMENT THROUGH THE INITIAL CLINICAL TRIAL.
Pursuant to Section 8.01(a), Genentech has agreed to purchase the agreed-upon
amount of Common Stock to provide funding for Development Expenses. If CTI
reasonably determines that Development Expenses will exceed those previously
agreed-upon, it shall notify Genentech. The Parties shall meet and agree if
additional


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<PAGE>   23
Development Expenses beyond those agreed-upon will be required. If the Parties
agree additional Development Expenses will be incurred and on the amount of such
additional Development Expenses, to the extent that such agreed-upon CTI
Development Expenses will exceed the funding provided by Genentech's equity
purchase pursuant to Section 8.01(a), Genentech shall purchase sufficient
additional equity, pursuant to an agreement in the form of the Stock Purchase
Agreement and at a price equal to one hundred percent (100%) of the 20 Day
Average of CTI's Common Stock, to fund in advance, the remainder of such
agreed-upon CTI Development Expenses. In no case shall CTI be required to fund
such additional expenses unless Genentech, in fact, makes the additional equity
purchase contemplated hereunder to cover such Development Expenses.

         If the amount of funding received by CTI pursuant to Sections 4.07(a)
and 8.01(a) exceeds the Development Expenses incurred by CTI through the
completion of analysis of the results of the Initial Clinical Trial or as of any
earlier termination of the Development Program or this Agreement, CTI shall
provide written notice to Genentech of the amount of such "overfunding". CTI
shall apply such "overfunding" to the Clinical Development Expenses to be
incurred by CTI under Section 4.07(b), except as otherwise provided hereinbelow,
and except that if such "overfunding" totals [ * ] or less, CTI shall be
entitled to retain such excess and shall not be required to apply it against any
future work under this Agreement or against redemption of CTI's Common Stock as
otherwise provided hereinbelow. Subject to the foregoing, if the amount of such
funding under Sections 4.07(a) and 8.01(a) exceeds the Development Expenses
incurred by CTI and CTI cannot apply such "overfunding" to the Clinical
Development Expenses to be incurred because (i) Genentech has determined
pursuant to Section 4.05 not to proceed forward with the Clinical Development
Program or (ii) this Agreement has been terminated at any time for any other
reason (except termination by CTI in accordance with this Agreement due to
Genentech's uncured default, in which case the provisions of this paragraph
shall apply except that CTI shall be entitled to retain "overfunding" in an
amount equal to CTI's already incurred costs for its work under this Agreement),
then Genentech shall have the rights and CTI the obligations set forth
hereinbelow. If Genentech so requests in writing within sixty (60) days after,
as applicable, Genentech's decision under Section 4.05 not to proceed forward or
the effective date of termination of this Agreement (except as otherwise
provided above with respect to Genentech's uncured default), within thirty (30)
days after such request CTI shall pay such overfunding



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<PAGE>   24
amount to Genentech against Genentech's delivery to CTI of that number of shares
of CTI's Common Stock equal to such overfunding amount divided by the price for
such Common Stock paid by Genentech under Section 8.01(a) (or, if such
overfunding is attributable only to CTI's receipt of additional funding from
Genentech under 4.07(a), the price paid for such Common Stock under Section
4.07(a)). In calculating the overfunding amount, CTI shall calculate the total
amount of expenses incurred by CTI hereunder based on the total expenses
incurred for performance of the tasks approved by the Development Committee
(without regard to categories of budgeted amounts).

         (b) FUNDING OF DEVELOPMENT THROUGH PHASE II CLINICAL TRIAL ANALYSIS.
Upon Genentech's decision pursuant to Section 4.05(b) to commence the Clinical
Development Program, pursuant to Section 8.01(b) Genentech will purchase Common
Stock pursuant to an agreement in the form of the Stock Purchase Agreement, in
an amount equal to the agreed-upon Phase II Clinical Development Expenses. If
CTI reasonably determines that its Phase II Clinical Development Expenses will
exceed those previously agreed-upon (subject to the following paragraph), it
shall notify Genentech. The Parties shall meet and agree if additional Phase II
Clinical Development Expenses beyond those agreed-upon will be required. If the
Parties agree additional Phase II Clinical Development Expenses will be incurred
and on the amount of such additional expenses, to the extent that such
agreed-upon CTI Phase II Clinical Development Expenses will exceed the funding
provided by Genentech's equity purchase pursuant to Section 8.01(b), Genentech
shall purchase sufficient additional equity, pursuant to an agreement in the
form of the Stock Purchase Agreement and at a price equal to one hundred percent
(100%) of the 20 Day Average of CTI's Common Stock, to fund, in advance, the
remainder of such agreed-upon CTI Phase II Clinical Development Expenses. In no
case shall CTI be required to fund such additional Phase II Clinical Development
Expenses unless Genentech, in fact, makes the additional equity purchase
contemplated hereunder to cover such Phase II Clinical Development Expenses.

         If the amount of funding received by CTI pursuant to Sections 4.07(a)
and (b) and 8.01(b) exceeds the Development Expenses and Clinical Development
Expenses incurred by CTI through the completion of analysis of the results of
the last Phase II Clinical Trial of a Licensed Product prior to commencement of
funding under Section 4.07(d), or as of any earlier termination of the Clinical
Development Program or this






                                       24
<PAGE>   25
Agreement, CTI shall provide written notice to Genentech of the amount of such
"overfunding". CTI shall apply such "overfunding" to CTI's share of the U.S.
Phase III Clinical Development Expenses to be borne by CTI pursuant to Section
4.07(d), except that if such "overfunding" totals [ * ] or less, CTI shall be
entitled to retain such excess and shall not be required to apply it against any
future work under this Agreement or redemption of CTI's Common Stock as
otherwise provided hereinbelow. Subject to the foregoing, if the amount of
funding under Sections 4.07(a) and (b) and 8.01(b) exceeds the Development
Expenses and Clinical Development Expenses incurred by CTI and CTI cannot apply
such "overfunding" to its share of the U.S. Phase III Clinical Development
Expenses to be borne by CTI because (i) Genentech has determined pursuant to
Section 4.05 not to proceed forward with the Clinical Development Program or
(ii) this Agreement has been terminated at any time for any other reason (except
termination by CTI in accordance with this Agreement due to Genentech's uncured
default, in which case the provisions of this paragraph shall apply except that
CTI shall be entitled to retain "overfunding" in an amount equal to CTI's
already incurred costs for its work under this Agreement), then Genentech shall
have the rights and CTI the obligations set forth hereinbelow. If Genentech so
requests in writing within sixty (60) days after, as applicable, Genentech's
decision under Section 4.05 not to proceed forward or the effective date of
termination of this Agreement (except as otherwise provided above with respect
to Genentech's uncured default), within thirty (30) days after such request CTI
shall pay such overfunding amount to Genentech against Genentech's delivery to
CTI of that number of shares of CTI's Common Stock equal to such overfunding
amount divided by the price for such Common Stock paid by Genentech under
Section 8.01(b) (or, if such overfunding is attributable only to CTI's receipt
of additional funding from Genentech under 4.07(b), the price paid for such
Common Stock under 4.07(b)). In calculating the overfunding amount, CTI shall
calculate the total amount of expenses incurred by CTI hereunder based on the
total expenses incurred for performance of the tasks approved by the Development
Committee (without regard to categories of budgeted amounts).

         (c) RECORDS. In connection with any application of "overfunding" to
future work or redemption of CTI Common Stock as provided in Sections 4.07(a) or
(b), CTI shall keep complete and accurate records of its expenses hereunder, and
Genentech shall have the right, upon written request after reasonable notice, to
have an independent certified public accountant reasonably acceptable to CTI,
review such records for the

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<PAGE>   26
purposes of verifying such "overfunding", if any. This right may not be
exercised more than once in any calendar year. Results of such review shall be
made available to both Parties. The provisions of Sections 4.07(a), (b) and (c)
regarding overfunding shall survive any termination of this Agreement.

         (d) FUNDING OF U.S. PHASE III CLINICAL DEVELOPMENT EXPENSES. If
Genentech decides to continue the Clinical Development Program after the review
under Section 4.05(c), the Parties shall agree on a budget for U.S. Phase III
Clinical Development Expenses. As provided below in this Section 4.07(d), CTI
shall pay [ * ] of the agreed-upon U.S. Phase III Clinical Development Expenses;
such [ * ] shall be financed by Genentech providing CTI with a revolving line of
credit in the principal amount of the to be agreed-upon [ * ] of U.S. Phase III
Clinical Development Expenses (less the amount of any overfunding, if any,
applied by CTI as provided in Section 4.07(b)), which line of credit shall bear
interest on the outstanding principal amount at a rate equal to LIBOR (as quoted
for one month in The Wall Street Journal) plus [ * ] compounded quarterly.
Subject to Section 10.07(a), such revolving loan shall be repaid in full (and
shall not be available for further borrowing by CTI) within [ * ] days after the
earlier of (i) seven (7) years from the date funds are first drawn down under
such line of credit or (ii) the earlier of (A) of the completion of the analysis
of all U.S. Phase III Clinical Trial(s) directed by the Development Committee,
(B) termination of the last U.S. Phase III Trial (if terminated prior to its
term), or (C) termination of this Agreement (as provided in Section 10.07
(a)(ii)). Notwithstanding the foregoing, under the loan documentation to be
entered into by the Parties, in the event of any event of default under such
loan documentation, including any CTI failure to repay the total amount of the
loan (principal plus interest) then outstanding, Genentech shall have the right
to convert the total amount of the loan outstanding into registered shares of
Common Stock of CTI.

         Such revolving loan may be prepaid by CTI at any time; CTI shall give
Genentech at least [ * ] days notice of any such prepayment. CTI may make any
payment under such loan in whole or in part by issuing to Genentech shares of
CTI stock, which shall be valued at price per share equal to one hundred percent
(100%) of the 20 Day Average of CTI's Common Stock. The loan under the revolving
line of credit shall be unsecured and fully subordinated to all other CTI
liabilities.

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<PAGE>   27
         At the time, if any, that Genentech elects to proceed under Section
4.05(c) to a U.S. Phase III Clinical Trial, the Parties shall agree on any
additional necessary terms of the line of credit.

         The Parties expect to pay for U.S. Phase III Clinical Development
Expenses equally. The Parties shall invoice each other for actual U.S. Phase III
Clinical Development Expenses; [ * ] is payable by Genentech. Genentech shall
pay the full amount it owes under such invoices and shall draw down from the
line of credit the amount CTI owes under such invoices, as contemplated by this
Section 4.07(d). If at any time either Party has paid more than its share of
such expenses, as provided in this Agreement, the Parties shall fairly adjust
the reimbursement of such expenses.

         Each Party shall keep complete and accurate records of the latest three
(3) years of its U.S. Phase III Clinical Development Expenses. Each Party shall
have the right at its own expense to have an independent certified public
accountant, reasonably acceptable to the other Party, review such records upon
reasonable notice and during reasonable business hours for the purposes of
verifying reimbursement hereunder. This right may not be exercised more than
once in any calendar year. Results of such review shall be made available to
both Parties. If the review reflects an overpayment of U.S. Phase III Clinical
Development Expenses by either Party, any such overpayment shall be promptly
remitted to the other Party with interest as provided in Section 8.04. If the
overpayment is equal to or greater than five percent (5%) of invoiced U.S. Phase
III Clinical Development Expenses, the overpaying Party shall be entitled to
have the other Party pay all of the costs of such review. The provisions of this
Section 4.07(d) shall survive termination of this Agreement.

                                    ARTICLE V

                                 GRANT OF RIGHTS

         5.01 GRANT BY CTI. CTI hereby grants to Genentech, under the CTI Patent
Rights and CTI Knowhow, (i) a [ * ] license (with CTI) [ * ] such Patent Rights
and Knowhow for [ * ] of Licensed Products in the United States in accordance
with the Development Program agreed upon by the Parties, and (ii) an


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<PAGE>   28
[ * ] license (even as to CTI) to [ * ] Licensed Products in the Territory 
outside the United States, and to [ * ] Licensed Products throughout the
Territory and (iii) in the event that manufacturing technology is transferred to
Genentech pursuant to Section 10.04, an [ * ] Licensed Products in the
Territory.

         5.02 GRANT BY GENENTECH. Genentech hereby grants to CTI, under the
Genentech Patent Rights and Genentech Knowhow, (i) a [ * ] to use such Patent
Rights and Knowhow for [ * ] of Licensed Products in the Territory in accordance
with the Development Program agreed upon by the Parties, and (ii) an [ * ]
license for the [ * ] of Licensed Products in the Territory up through review of
results of the primate efficacy study and diffusion study referred to in Section
4.05 (a), and (iii) if and only if Genentech elects to continue development
after the review under Section 4.05(a), an [ * ] of Licensed Products in the
Territory up through the review of results of the Initial Clinical Trial, and
(iv) if and only if Genentech elects to continue development after the review
under Section 4.05(b), an [ * ] of Licensed Products in the Territory up through
review of results of the relevant Phase II Clinical Trial and (v) if and only if
Genentech elects to continue development after the review under Section 4.05(c),
an [ * ] Licensed Products in the Territory for supply to Genentech and its
permitted sublicensees hereunder (so long as [ * ] are met and CTI is not in
breach under this Agreement).

         5.03 DUE DILIGENCE. Genentech and CTI shall use due diligence in
developing and seeking marketing approvals for Licensed Products as contemplated
by this Agreement. As used in this Section 5.03, "due diligence" shall mean a
reasonable effort consistent with sound business judgment and shall include all
steps reasonably necessary to enable and facilitate the development and
marketing of Licensed Products. In particular, CTI shall use its reasonable best
efforts to complete the work under the Development Program within the [ * ]
specified in Section 3.04, and, if Genentech elects to proceed forward with
development after the reviews under Sections 4.05(b) and (c), to complete the
first Phase II Clinical Trial and the first U.S. Phase III Clinical Trial in
accordance with timelines agreed upon by the Parties.


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         5.04 SUBLICENSES. Neither Genentech nor CTI shall have the right to
grant sublicenses to third parties under the licenses received under Sections
5.01 or 5.02 unless otherwise mutually agreed in writing; provided, however,
that (i) Genentech may grant sublicenses of its rights hereunder to Affiliates
without obtaining CTI's consent and (ii) Genentech may sublicense the rights
granted to it hereunder to market and sell Licensed Product in the Territory to
any third party without obtaining CTI's consent. Any permitted sublicensee shall
commit in writing to abide by all applicable terms and conditions of this
Agreement. Each party shall be responsible for compliance by its sublicensee(s)
with such sublicensee's obligations under its sublicense.

         5.05 OTHER MOLECULES. During the term of this Agreement, CTI agrees
that it will [ * ].

                                   ARTICLE VI

                         MARKETING OF LICENSED PRODUCT

         6.01 MARKETING RESPONSIBILITIES. Genentech shall have the sole
responsibility for sales and marketing of Licensed Product in the Territory.

         6.02 MARKETING DUE DILIGENCE. In addition to the due diligence
obligations of the Parties set forth in Section 5.03, Genentech agrees to use
its reasonable best efforts to market and sell Licensed Product throughout the
Territory, provided that with respect to a given country or territory in the
Territory, approvals to market and sell Licensed Product have been received in
such country or territory.


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                                   ARTICLE VII

                         PATENTS, KNOWHOW AND INVENTIONS

         7.01 OWNERSHIP. Genentech shall retain sole title to the Genentech
Knowhow and the Genentech Patent Rights as presently existing and as developed
or invented by Genentech or on its behalf during the term of this Agreement, and
shall have sole title to any improvements to the CTI Knowhow or CTI Patent
Rights developed or invented solely by Genentech or on its behalf during the
term of this Agreement. CTI shall retain sole title to the CTI Knowhow and the
CTI Patent Rights as presently existing and as developed or invented by CTI or
on its behalf during the term of this Agreement, and shall have sole title to
any improvements to the Genentech Knowhow or Genentech Patent Rights developed
or invented solely by CTI or on its behalf during the term of this Agreement.
The Parties shall jointly own any improvements to any Knowhow or Patent Rights
developed or invented by both Parties or on their behalf during the term of this
Agreement. Designation of inventor(s) on any patent application is a matter of
applicable laws, and shall be solely within the discretion of qualified patent
counsel of Genentech and CTI to determine in accordance with applicable laws of
inventorship and competent evidence of the Parties.

         7.02 PURSUIT OF SOLE PATENT APPLICATIONS.

         Each Party shall, to the extent it elects to do so and at its own cost
and expense, prepare, file, prosecute and maintain patent applications and
patents covering (i) any of its own Knowhow or solely owned improvements to its
Knowhow or Patent Rights (under Section 7.01), or (ii) any improvements to its
own Knowhow or Patent Rights developed and owned solely by the other Party
(under Section 7.01). Neither Party shall withdraw or abandon any of such Patent
Rights or any of such applications and/or resulting Patent Rights without
providing the other Party a free of charge option for a period of 90 days to
assume the prosecution and/or maintenance thereof at its own expense.

         7.03 RESIDUAL RIGHTS; GRANT BACK. Subject to the grant of exclusive
rights under Article V during the term of this Agreement, each Party shall be
free to use,




                                       30
<PAGE>   31
license and/or transfer as it sees fit (i) its own Patent Rights and Knowhow,
(ii) any improvements to its own Patent Rights or Knowhow solely owned by it
under Section 7.01, (iii) its interest in jointly owned improvements to Knowhow
or Patent Rights under Section 7.01, and (iv) its interest in Joint Patent
Rights under Section 7.04. During the term of this Agreement, Genentech hereby
grants back to CTI an exclusive (except as to Genentech under Article V) right
and license to use, sublicense and/or transfer as CTI sees fit any improvements
to CTI Knowhow or CTI Patent Rights solely owned by Genentech under Section
7.01, and during the term of this Agreement CTI hereby grants back to Genentech
an exclusive (except as to CTI under Article V) right and license to use,
sublicense and/or transfer as Genentech sees fit any improvements to Genentech
Knowhow or Genentech Patent Rights solely owned by CTI under Section 7.01. Each
Party shall notify the other Party promptly if it solely develops or invents any
improvements to the other Party's Knowhow or Patent Rights as contemplated in
Section 7.01.

         7.04 JOINT PATENTS. In the event that it is determined, in accordance
with Section 7.01, that both: (i) employees or agents of Genentech or any other
persons obliged to assign such invention to Genentech, and (ii) employees or
agents of CTI or any other persons obliged to assign such invention to CTI, are
joint inventors of an invention, the Parties shall jointly own patents,
inventor's certificates and applications therefor covering such invention.
Genentech shall prosecute all such patents claiming Factors, and CTI shall
prosecute all such patents claiming the Encapsulation Technology. If a patent
claims both Factors and the Encapsulation Technology, Genentech shall determine
whether and how to prosecute any such potential patent application and be
responsible for all costs incurred in prosecution. In making such determination,
Genentech shall take into account the interests of both Parties and CTI shall
have the right to file (or continue, as the case may be) at its expense, a
patent application claiming the Encapsulation Technology to the extent that
Genentech decides not to file or to continue to prosecute a patent application
claiming such Encapsulation Technology. Notwithstanding the foregoing, the
Parties shall assist each other to the maximum extent reasonable in securing
intellectual property rights resulting from activities conducted hereunder.
Either Party may withdraw from or abandon any jointly-owned patent or patent
application, on notice to the other providing a free-of-charge option to assume
the prosecution and/or maintenance thereof at its own cost and expense.





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<PAGE>   32
         7.05 INFRINGEMENT OF SOLE PATENTS. If a Party considers that any of the
Patent Rights of the other is being infringed by a third party, the former shall
promptly notify the latter and shall provide it with any evidence of any
infringement which is reasonably available. The Party owning the Patent Rights
shall have the first opportunity at its own expense to attempt to remove such
infringement by appropriate steps including suit. In such event, the other Party
will assist in taking such steps, including suit, within reasonable limits, and
any amount recovered as a result thereof shall be for the account of the Party
owning the Patent Rights. In the event the Party owning the Patent Rights fails
to take appropriate steps, including suit and legal action with respect to any
such infringement within a period of six months following such notice of
infringement, the other Party shall have the right to take any appropriate
steps, including suit, against the infringer at its own expense and in its name.
In such event, the owner of the Patent Rights shall assist the Party bringing
suit as reasonably requested and shall permit the Party bringing suit to use its
name in the suit. The expenses reasonably incurred in taking such steps,
including suit and legal action, and any amount recovered as a result thereof
shall be for the account of the Party taking such action, and the Party not
taking such action shall be reimbursed for its out-of pocket expenses in
connection with such suit or action.

         7.06 INFRINGEMENT OF JOINT PATENT RIGHTS. In the event that any
jointly-owned Patent Right shall be infringed, then the Parties agree to consult
with each other as to the best manner in which to proceed. Should the Parties
fail to agree on a joint program of action and the understanding relating
thereto with respect to distribution of expenses and recoveries, then either
Party shall have the right to enforce such jointly-owned patent at its sole
expense and any recovery shall be first applied to reimbursing the Party for the
out-of-pocket expenses incurred in bringing such suit or action and the
remainder, if any, shall be divided appropriately between the Parties with
reference to the relative monetary injury suffered by each by reason of the past
infringement for which said amounts are recovered. The other Party shall agree
to be joined in such suit and may, at its option, be represented by counsel of
its choosing and at its own expense.

         7.07 THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. Subject to the other
terms of this Agreement, each of the Parties shall be responsible for [ * ]
hereunder. Each Party shall promptly notify the other Party of it becoming aware
of


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<PAGE>   33
any payments which will be due to third parties on account of intellectual
property rights and the amount of such payments.

         [ * ]

         7.08 SURVIVAL. Sections 7.01, 7.02, 7.03 and 7.04 shall survive the
termination or expiration of this Agreement.

                                  ARTICLE VIII

                           PAYMENTS AND PROFIT SHARING

         8.01 EQUITY INVESTMENT.

          (a) Initial Equity Purchase. Pursuant to an agreement in the form of
the Stock Purchase Agreement, Genentech shall purchase Eight Million Three
Hundred Thousand Dollars ($8,300,000) worth of CTI Common Stock on the date
approximately thirty (30) days after the execution of this Agreement by both
Parties, at a price per share equal to one hundred ten percent (110%) of the 20
Day Average of CTI's Common Stock. For purposes of the foregoing, the Parties
agree that the 20 Day Average shall be calculated using the [ * ] of this
Agreement. In addition Genentech shall purchase additional stock, if necessary,
pursuant to Section 4.07(a), at a price per share equal to one hundred percent
(100%) of the 20-Day Average of CTI's Common Stock on a purchase date to be
agreed upon.

         (b) Phase II Equity Purchase. Pursuant to an agreement in the form of
the Stock Purchase Agreement, if Genentech has decided to proceed with the
Clinical Development Program after the review under Section 4.05(b), and prior
to starting the first Phase II Clinical Trial, if at all, Genentech shall
purchase CTI Common Stock in an amount equal to the agreed-upon Phase II
Clinical Development Expenses, at a price equal to one hundred percent (100%) of
the 20 Day Average of CTI's Common Stock. In addition Genentech shall purchase
additional stock, if necessary, pursuant to


* Confidential Treatment Requested

                                       33
<PAGE>   34
Section 4.07(b), at a price per share equal to one hundred percent (100%) of the
20-Day Average of CTI's Common Stock on a purchase date to be agreed upon.

         8.02 NET PROFITS INSIDE THE UNITED STATES. Commencing with the First
Commercial Introduction of a Licensed Product in the United States and subject
to the other terms of this Agreement, during the term of this Agreement, CTI
shall be entitled to [ * ] of the Net Profits for each Licensed Product sold or
disposed of for value in the United States by Genentech and its permitted
sublicensees and Genentech shall be entitled to [ * ] of such Net Profits; CTI
shall also be entitled to payment for such License Product, if supplied by CTI
hereunder, as provided in Section 4.06 and the Commercial Supply Agreement.

         If in any Accounting Period "Net Profits" are negative, such loss
shall, for CTI, be carried forward and offset against CTI's share of future Net
Profits. Such loss shall bear interest on the outstanding principal amount at a
rate equal to LIBOR (for one month as quoted in The Wall Street Journal) plus
[ * ] compounded quarterly.

         8.03 NET SALES OUTSIDE THE UNITED STATES. Commencing with the First 
Commercial Introduction of the Licensed Product outside the United States and
subject to the other terms hereof (including, without limitation, Section
10.04), during the term of this Agreement, Genentech agrees to pay CTI, as
consideration for the rights granted hereunder, [ * ] of Net Sales of Licensed
Product by Genentech and its sublicensees in the Territory outside the United
States and (ii) payment for such Licensed Product, if supplied by CTI hereunder,
as provided in Section 4.06 and the Commercial Supply Agreement.

         8.04 PAYMENT DATES AND STATEMENTS. Within sixty (60) days of the end of
each Accounting Period in which Net Sales occurred for purposes of Section 8.02
and ninety (90) days of the end of each Accounting Period in which Net Sales
occurred for purposes of Section 8.03, Genentech shall calculate all amounts
owed by Genentech to CTI under Section 8.02 or 8.03 and shall send to CTI the
net amount owed to CTI or, if appropriate, a statement of the loss carried
forward by Genentech on behalf of CTI plus interest thereon as specified herein.
Such payment shall be accompanied by a statement for the Accounting Period
showing the calculation of the amount owed and for each country in the
Territory, the total Net Sales of each Licensed Product by


* Confidential Treatment Requested


                                       34
<PAGE>   35
Genentech and its permitted sublicensees, the exchange rate used to directly
convert any of the above amounts into U.S. Dollars, and, in the case of Net
Sales inside the United States, the Cost of Sales for each Licensed Product
during that Accounting Period, the Sales, General and Administrative Expense
(and the calculation thereof), the Launch Expenses, the Phase IV Clinical Trial
Expenses, the Net Profit, and the amount of any CTI loss carried forward. For
purposes of determining when a sale of a Licensed Product occurs, the sale shall
be deemed to occur on the date the Licensed Product is shipped to a third party.
Any payment owed under Section 8.02 or 8.03 that is not paid on or before the
date such payment is due under this Agreement shall bear interest, to the extent
permitted by applicable law, at two percentage points (2%) over the prime rate
of interest as reported by Bank of America NT&SA in San Francisco, California
from time to time, calculated on the number of days such payment is delinquent.

         8.05 RECORDS AND ACCOUNTING

         (a) Genentech and its permitted sublicensees shall keep complete and
accurate records of the latest three (3) years of Net Sales and, for sales of
Licensed Products in the United States, Cost of Sales, Sales, General and
Administrative Expense, Launch Expenses and Phase IV Clinical Trial Expenses.
CTI shall have the right at its own expense to have an independent, certified
public accountant, reasonably acceptable to Genentech (or any relevant
sublicensee), review such records upon reasonable notice and during reasonable
business hours for the purposes of verifying royalties payable to CTI, Net
Sales, and Net Profits. This right may not be exercised more than once in any
calendar year. Results of such review shall be made available to both Parties.
If the review reflects an underpayment of royalties or Net Profits to CTI, such
underpayment shall be promptly remitted to CTI with interest as provided in
Section 8.04. If the underpayment is equal to or greater than five percent (5%)
of Net Profits that was otherwise due, CTI shall be entitled to have Genentech
pay all of the costs of such review. If the review reflects an overpayment of
royalties and Net Profits to CTI, royalties and Net Profits for the period of
such overpayment shall be recalculated and any amount due to Genentech shall be
promptly paid.

         (b) CTI and its permitted sublicensees shall keep complete and accurate
records of the latest three (3) years of Fully Burdened Manufacturing Cost, and
shall provide Genentech with a report setting forth all such items within
forty-five (45) days of





                                       35
<PAGE>   36
the end of each Accounting Period. Genentech shall have the right at its own
expense to have an independent, certified public accountant, reasonably
acceptable to CTI, review such records upon reasonable notice and during
reasonable business hours for the purposes of verifying the Fully Burdened
Manufacturing Cost. This right may not be exercised more than once in any
calendar year. Results of such review shall be made available to both Parties.
If the review reflects an overpayment of the Fully Burdened Manufacturing Cost
to CTI, such overpayment shall be promptly refunded to Genentech with interest
as provided in Section 8.04. If the overpayment is equal to or greater than five
percent (5%) of the Fully Burdened Manufacturing Cost, Genentech shall be
entitled to have CTI pay all of the costs of such review. If the review reflects
underreporting of CTI's Fully Burdened Manufacturing Cost, Fully Burdened
Manufacturing Cost for the period of such underreporting shall be re-calculated
and any amounts due to CTI shall be promptly paid.

         8.06 CURRENCY OF PAYMENTS. All payments under this Agreement shall be
made in United States Dollars by check or wire transfer (or such other
reasonable means as a receiving Party may direct) to such bank account as may be
designated from time to time. Any payments due hereunder on Net Sales outside of
the United States shall be payable in United States Dollars calculated pursuant
to U.S. generally accepted accounting principles consistently applied at the
rate of exchange of the currency of the country in which the Net Sales were
made, with such rate as is equal to the average of the rates reported in The
Wall Street Journal for the first and last business day of the Accounting Period
for which the Net Profit Amount or royalties are payable.

         8.07 TAX WITHHOLDING. If any withholding taxes are required under the
applicable laws of any country or any applicable treaty on royalty payments made
hereunder, the selling Party will pay such taxes to the proper taxing authority
and such tax payment will be deducted by the selling Party from the royalty
payable to the owed Party. Written documentation of any such payment sufficient
to satisfy the reasonable requirements of an appropriate tax authority
concerning an application by the owed Party for a foreign tax credit for such
payment or for similar treatment shall be secured and sent to the owed Party.
The selling Party agrees to take such reasonable and lawful steps as the owed
Party may request to minimize the amount of withholding taxes that must be paid
pursuant to any applicable treaty to the extent permitted by such treaty. If
either Party to this Agreement, by reason of the assignment of its rights



                                       36
<PAGE>   37
under this Agreement, as specified in Section 11.02, increases the withholding
tax payable by the non-assigning Party in any taxing jurisdiction, then the
assigning Party agrees to pay the non-assigning Party an amount which, net of
any tax benefits which the non-assigning Party may use, would be the same as if
the assignment had not occurred.

         8.08 FINANCE COMMITTEE.

         In connection with the sharing of Net Profits contemplated under
Section 8.02, within thirty (30) days after Genentech's notice of exercise of
its right to continue the Clinical Development Program after the review under
Section 4.05(c), the Parties will establish a joint finance committee (the
"Finance Committee"), to be comprised of two (2) representatives appointed and
replaced by each Party. Such representatives will include individuals with
expertise and responsibilities in the areas of accounting, cost allocation,
budgeting or financial reporting. The Finance Committee will meet as requested
by either Party by notice to the other Party (but in any event not more
frequently than quarterly), at such times and locations as are reasonably
acceptable to the Parties. All decisions and recommendations of the Finance
Committee shall require the agreement of a majority of the representatives of
each Party to be effective. In the event the representatives of the two Parties
cannot agree on a matter, a member of senior management of each party shall
confer and resolve the dispute. For this purpose, a "member of senior
management" shall be a management-level employee who has the authority to bind a
Party. If the members of senior management do not resolve such dispute within 60
days of such objection, the Parties shall attempt to resolve such dispute in
accordance with Sections 11.19 and 11.20. The Finance Committee shall address
financial, budgeting and accounting issues which arise in connection with the
sharing of Net Profits contemplated under Section 8.02 above (including, without
limitation, review of the Parties' respective cost structures and generally
accepted accounting principles and other practical aspects of implementation of
the terms of this Agreement and the amount of Cost of Sales, Fully Burdened
Manufacturing Cost, Sales, General and Administrative Expense, Launch Expenses
and Phase IV Clinical Trial Expenses) and the proper allocation of such costs in
determining Net Profits. The Finance Committee (if any) automatically will cease
to operate upon the expiration of the term of this Agreement.


                                       37
<PAGE>   38
                                   ARTICLE IX

                   CONFIDENTIALITY AND DISTRIBUTION OF KNOWHOW

         9.01 NON-DISCLOSURE. Except to the extent expressly authorized by this
Agreement, the Parties agree that, for the term of this Agreement and for seven
years thereafter (15 years in the case of manufacturing technology), the
receiving Party shall keep completely confidential and shall not publish or
otherwise disclose and shall not use for any purpose other than as contemplated
by this Agreement any information furnished to it by the other Party pursuant to
this Agreement (other than to employees or consultants on a need-to-know and
confidential basis), except to the extent that it can be established by the
receiving Party by competent proof that such information:

         (a) was already known to the receiving Party, other than under an
obligation of confidentiality, at the time of disclosure by the other Party;

         (b) was generally available to the public or otherwise part of the
public domain at the time of its disclosure to the receiving Party;

         (c) became generally available to the public or otherwise part of the
public domain after its disclosure and other than through any act or omission of
the receiving Party in breach of this Agreement; or

         (d) was subsequently lawfully disclosed to the receiving Party by a
third party.

         Information that is disclosed other than in written form shall be
subject to the terms of this Section 9.01 only if confirmed in writing within
thirty (30) days of disclosure and specifying that such information is subject
to this Agreement. Each Party may disclose the other's information to the extent
such disclosure is reasonably necessary in filing or prosecuting patent
applications, prosecuting or defending litigation, complying with applicable
governmental regulations or conducting clinical trials, provided that, if a
Party proposes to make any such disclosure of the other Party's secret or
confidential information, it will give reasonable advance notice to the other
Party of such disclosure and, save to the extent inappropriate in the case of
patent applications, will use its best efforts to secure confidential treatment
of such information required to be disclosed. A Party may disclose confidential
information to



                                       38
<PAGE>   39
a potential sublicensee or assignee to the extent reasonably required to
negotiate a sublicense or assignment permitted hereunder; provided, however,
that such potential sublicensee or assignee shall first execute a binding
confidentiality agreement of term and scope at least as restrictive as the terms
of this Article IX, and which confidentiality agreement shall expressly provide
that the non-disclosing Party is intended to be a third-party beneficiary
thereof.

         9.02 PUBLICATION. Notwithstanding Section 9.01, each Party shall be
free to publish the results of its activities conducted hereunder, to the extent
that publication will not result in the disclosure of otherwise confidential
data or Knowhow and will not conflict with the terms of the Neurturin MTA.
Subject to the foregoing, at least 30 days prior to making any such publication
(14 days in the case of an abstract), the publishing Party shall provide the
other Party a draft of the proposed publication to afford an opportunity for
comment and securing of intellectual property rights. Publication shall be
delayed an additional 30 days to permit filing of patent applications upon
request. Neither Party may publish the other's Knowhow without the prior written
consent of the other Party.

         9.03 DISTRIBUTION OF KNOWHOW.

         Neither Party shall transfer any of the other Party's Knowhow
(including without limitation, any Factors or genetic materials encoding
therefor provided by such other Party or any proprietary information of such
other Party under Section 9.01) to any third party without the express prior
consent of the Party which provided such Knowhow, provided either Party may make
such disclosures as are required by law or a court order (but before any such
required disclosure it shall notify the other Party) or as are required as part
of regulatory submissions or as required in sublicensing (provided that in cases
of sublicensing, the entity receiving such Knowhow agrees to confidentiality and
nonuse provisions at least as restrictive as those in this Article IX).


                                    ARTICLE X

                              TERM AND TERMINATION

         10.01 TERM. The term of this Agreement shall commence as of the
Effective



                                       39
<PAGE>   40
Date set forth above. Unless sooner terminated pursuant to Sections 10.02,
10.03, 10.05 or 10.06, the term of this Agreement, the licenses granted in
Sections 5.01 and 5.02 and Genentech's obligations with respect to Net Profits
and royalties under Sections 8.02 and 8.03 shall expire on a [ * ] years from
the date of First Commercial Introduction in that country. Subject to the other
terms of this Agreement (including this Section 10.01), upon expiration of this
Agreement on such country-by-country and Licensed Product-by-Licensed Product
basis, Genentech shall have a perpetual, fully paid up, non-exclusive right and
license under the CTI Knowhow and CTI Patent Rights, and any improvements
thereto solely or jointly owned by CTI under Section 7.01, to develop, make,
have made, use and sell such Licensed Products in such country in the Territory,
and a perpetual, fully paid up, exclusive right and license in such country in
the Territory to improvements to the Genentech Knowhow or Genentech Patent
Rights solely developed or invented and solely owned by CTI under Section 7.01.
Subject to the other terms of this Agreement, upon expiration of this Agreement
CTI shall have a perpetual, fully paid-up, exclusive right and license in such
country in the Territory to improvements to the CTI Knowhow or CTI Patent Rights
solely developed or invented and solely owned by Genentech under Section 7.01.
No later than [ * ] prior to the expiration of the term of the licenses
granted hereunder, the Parties shall discuss the status of their relationship
and shall agree, if Licensed Product is still being marketed hereunder anywhere
in the world solely by Genentech or its sublicensee(s), either to extend the
Supply Agreements or to transfer manufacturing technology and all necessary
licenses to Genentech. Any such extended Supply Agreement(s) shall provide for a
supply price of [ * ] of (i) Fully Burdened Manufacturing Cost plus [ * ] or
(ii) the cap on Fully Burdened Manufacturing Cost agreed upon pursuant to
Section 4.06. If no agreement is reached on supply prior to two years before
such expiration, CTI shall transfer all necessary manufacturing technology in
CTI's possession or control and grant all necessary licenses under the CTI
Patents and CTI Knowhow (including any improvements hereunder) to Genentech
(with right to sublicense) for the nonexclusive rights to make, have made, use
and sell Licensed Product then under sale in the Field of Use in the Territory
(but for no other purpose) and CTI shall permit Genentech and its sublicensees
to reference or otherwise get the benefit of any necessary regulatory filings
necessary to permit such manufacture and sale of Licensed Product. All such
licenses shall be fully paid up (subject to the cost reimbursement provided
below). In the event of a transfer of such technology and granting all necessary
licenses to


* Confidential Treatment Requested

                                       40
<PAGE>   41
Genentech upon the expiration of this Agreement, Genentech shall reimburse CTI
for all reasonable costs incurred by it as part of such transfer, and Genentech
shall be responsible for the payment of all royalties and other amounts
contractually required to be paid by CTI to third parties on account of such
manufacture, use or sale by Genentech or its sublicensees.

         10.02 BREACH. Failure by either Party to comply with any of its
material obligations contained in this Agreement shall entitle the other Party
to give to the Party in default notice specifying the nature of the default and
requiring it to make good such default. If such default is not cured within 60
days after the receipt of such notice, the notifying Party shall be entitled,
without prejudice to any of its other rights conferred on it by this Agreement,
in addition to any other remedies available to it by law or in equity, to
terminate this Agreement unless the defaulting Party shall cure such default
within said 60 days. The right of either Party to terminate this Agreement, as
hereinabove provided, shall not be affected in any way by its waiver of failure
to take action with respect to any previous default.

         10.03 INSOLVENCY OR BANKRUPTCY. Either Party may, in addition to any
other remedies available to it by law or in equity, terminate this Agreement by
written notice to the other Party in the event the other Party shall have become
insolvent or bankrupt, or shall have made an assignment for the benefit of its
creditors, or there shall have been appointed a trustee or receiver of the other
Party or for all or a substantial part of its property, or any case or
proceeding shall have been commenced or some other action taken by or against
the other Party in bankruptcy or seeking reorganization, liquidation,
dissolution, winding-up, arrangement, composition or readjustment of its debts
or any other relief under any bankruptcy, insolvency, reorganization or other
similar act or law of any jurisdiction now or hereafter in effect or there shall
have been issued a warrant of attachment, execution, distraint or similar
process against any substantial part of the property of the other Party, and any
such event shall have continued for 60 days undismissed, unbounded and
undischarged; provided, however, that no such right to terminate shall pertain
solely by virtue of a voluntary reorganization for the purpose of solvent
amalgamation or reconstruction.

         10.04 TRANSFER OF TECHNOLOGY. (a) Upon termination of this Agreement
due to Genentech's fundamental breach (including, without limitation, a failure
to pay CTI Net Profits or royalties on Net Sales owed hereunder) or bankruptcy,
the licenses





                                       41
<PAGE>   42
granted in Article V to Genentech shall terminate, and, Genentech shall grant to
CTI a Territory-wide, exclusive license to develop, make, have made, use and
sell Licensed Product in the Field of Use in the Territory (but for no other
purpose) under the Genentech Patents and Knowhow solely or jointly owned by
Genentech with CTI hereunder (including any improvements hereunder) with the
right to sublicense and the right to reference or otherwise get the benefit of
any necessary regulatory filings of Genentech or its sublicensees, and, upon the
request of CTI, Genentech shall transfer to CTI any technology in its possession
or control under the scope of such license and necessary for CTI to develop,
make, have made, use or sell Licensed Product in the Field of Use in the
Territory (but for no other purpose). CTI shall pay Genentech royalties in the
amount of [ * ] of Net Sales of Licensed Product by CTI and its sublicensees 
and shall be responsible for all of Genentech's obligations hereunder. In
addition to the royalties to be paid to Genentech, CTI shall be responsible for
reimbursing Genentech for the payment of all royalties and other amounts
contractually required to be paid by Genentech to third parties on account of
such manufacture, sale or use of Licensed Product by CTI or its sublicensees.

         (b) Upon termination of this Agreement due to CTI's fundamental breach
(e.g., failure to supply Licensed Product as provided herein or in the Supply
Agreement(s)) or bankruptcy, the licenses granted to CTI in Article V shall
terminate, and, CTI shall grant to Genentech a Territory-wide, exclusive license
to develop, make, have made, use and sell Licensed Product in the Field of Use
in the Territory (but for no other purpose) under the CTI Patents and Knowhow,
solely or jointly owned hereunder by CTI with Genentech (including any
improvements hereunder) with the right to sublicense and the right to reference
or otherwise get the benefit of any necessary regulatory filings of CTI or its
sublicensees, and upon the request of Genentech, CTI shall transfer to Genentech
any technology in its possession or control under the scope of such license and
necessary for Genentech to develop, make, have made, use and sell Licensed
Product in the Field of Use in the Territory (but for no other purpose).
Genentech shall pay CTI royalties in the amount of [ * ] of Net Sales of
Licensed Product in the Field of Use in the Territory by Genentech and its
sublicensees and shall be responsible for all of CTI's obligations hereunder. In
addition to the royalties to be paid to CTI, Genentech shall be responsible for
reimbursing CTI for payment of all royalties and other amounts contractually
required to be paid by CTI to third parties on account of such manufacture, sale
or use of Licensed Product by Genentech or its sublicensees, but Genentech shall
be entitled to


* Confidential Treatment Requested

                                       42
<PAGE>   43
offset against such royalty and other payments to CTI all of Genentech's
out-of-pocket costs and expenses incurred in constructing facilities to
manufacture Licensed Product in the Territory and obtaining approval of an
establishment license application or equivalent regulatory approval of such
manufacturing facilities. Genentech's right to offset its out-of-pocket costs of
construction and approval shall be limited to those expenses reasonably incurred
related to constructing a facility similar to the plant being used by CTI to
produce Licensed Product hereunder. CTI shall have the option, in lieu of the
foregoing offsets, of transferring to Genentech the ownership and/or control of
the plant (with all liabilities incurred in connection with the construction,
validation and approval of such plant) it is using at the time to supply
Licensed Product hereunder. Genentech may reasonably refuse to accept such
transfer, in which case Genentech's right to offset shall continue. Genentech
may request that CTI transfer its technology to a third party solely for the
manufacture of Licensed Product. CTI may reasonably withhold its consent to a
transfer to a particular third party, but may not reject all possible reasonable
third party candidates for such a transfer put forth by Genentech. During the
period of such a transfer, CTI shall treat Genentech as its first priority
customer for supply of Licensed Product. The Parties agree that the technology
transfer will involve the need for CTI employees to train Genentech or its third
party designee's employees. CTI will pay the salaries of its employees doing
such training but will not be responsible for the payment of the salaries of
Genentech or third party employees receiving training. Genentech will be
responsible for all other obligations of CTI under this Agreement.

         10.05 MUTUAL AGREEMENT. The Parties may terminate any development
program or this Agreement by mutual agreement at any time.

         10.06 SPECIAL TERMINATION RIGHTS.

         (a) If Genentech elects not to continue the Development Program or the
Clinical Development Program pursuant to Section 4.05 and the Parties do not
agree to a new program hereunder within ninety (90) days, either Party may
terminate this Agreement on ninety (90) days written notice to the other Party.

         (b)(i) With respect to any Licensed Product, CTI may provide Genentech
with a written notice at any time within thirty (30) days of Genentech's
election under Section 4.05(b) to proceed with the Phase II Clinical Trial, of
CTI's election not to proceed



                                       43
<PAGE>   44
further with the Clinical Development Program for such Licensed Product. After
such notice, CTI shall have no further obligation to develop such Licensed
Product or fund any costs hereunder for such Licensed Product, except as
provided herein. Genentech shall have the option for a period of one hundred
twenty (120) days after CTI's notice, [ * ] CTI shall continue to develop such
Licensed [ * ] (and approval of the costs to be incurred) and the terms and
conditions of this Agreement (including CTI's obligation to manufacture and
supply, and Genentech's obligation to purchase, Licensed Product hereunder)
shall remain in full force and effect, except that in lieu of the sharing of Net
Profits on Net Sales of Licensed Products in the United States under Section
8.02 and the royalty on Net Sales of Licensed Products in the Territory outside
the United States under Section 8.03, CTI shall be entitled to a royalty of only
[ * ] of Net Sales of such Licensed Products by Genentech and its permitted
sublicensees in the Territory, and its Fully Burdened Manufacturing Cost for
such Licensed Product, if supplied by CTI hereunder. CTI shall be obligated to
repay the full amount of the loan outstanding at a date to be agreed upon but in
any event no later than [ * ] from each [ * ] to CTI thereunder. At CTI's
election, such [ * ] shall be in cash and/or stock (pursuant to an agreement in
the form of the Stock Purchase Agreement) valued at the 20 Day Average.

         (ii) With respect to any Licensed Product, CTI may provide Genentech
with a written notice at any time within thirty (30) days of Genentech's
election under Section 4.05(c) to proceed with any Phase III Clinical Trial, of
CTI's election not to proceed further with the Clinical Development Program for
such Licensed Product. After such notice, CTI shall have no further obligation
to develop such Licensed Product or fund any costs hereunder for such Licensed
Product, except as provided herein. Genentech shall have the option for a period
of one hundred twenty (120) days after CTI's notice, to [ * ]. If Genentech
elects to make such loan, CTI shall continue to develop such Licensed [ * ]
(and approval of the costs to be incurred) and the terms and conditions of this
Agreement (including CTI's obligation to manufacture and supply, and Genentech's
obligation to purchase, such Licensed Product hereunder) shall remain in full
force and effect, except that in lieu of the sharing of Net Profits on


* Confidential Treatment Requested

                                       44
<PAGE>   45
Net Sales of Licensed Products in the United States under Section 8.02 and the
royalty on Net Sales of Licensed Products in the Territory outside the United
States under Section 8.03, CTI shall be entitled to a royalty of only [ * ]
of Net Sales of Licensed Products by Genentech and its sublicensees in the
United States, a royalty of only [ * ] of Net Sales of Licensed Products by
Genentech and its sublicensees in the Territory outside the United States, and
its Fully Burdened Manufacturing Cost for such Licensed Product, if supplied by
CTI hereunder. CTI shall be obligated to [ * ] at a date to be agreed upon but
in any event no later than five (5) years from each transfer of funds to CTI
thereunder. At CTI's election, such [ * ] shall be in cash and/or stock
(pursuant to an agreement in the form of the Stock Purchase Agreement) valued at
the 20 Day Average.

         10.07  EFFECT OF TERMINATION.

         (a) Equity Purchases/Line of Credit. If this Agreement is terminated,
(i) any equity purchase previously made by Genentech pursuant to Section 8.01
shall not be affected (subject to Sections 4.07(a) and (b) regarding
overfunding), (ii) if such termination is not a result of Genentech's uncured
default, CTI shall within one hundred eighty (180) days repay in full (in stock
at a price equal to the 20 Day Average and/or in cash, at CTI's election) any
outstanding loan balance (principal and interest) under the line of credit
referred to in Section 4.07(d), and (iii) if such termination is a result of
Genentech's uncurled default, CTI shall within one hundred eighty (180) days
repay (in stock at a price equal to the 20 Day Average and/or in cash, at CTI's
election) in [ * ] under the line of credit referred to in Section 4.07(d).

         (b) Materials/Knowhow. Except as otherwise provided herein, upon
termination of this Agreement, each Party shall destroy (and provide a
certificate of destruction) or return to the other Party, all Knowhow provided
by the other Party including all biological materials and proprietary
information provided by the other Party.

         (c) Improvements. On any termination of this Agreement, Genentech shall
have a perpetual, fully paid up, exclusive right and license in the Territory to
improvements to the Genentech Knowhow or Genentech Patent Rights solely
developed or invented and solely owned by CTI under Section 7.01, and CTI shall
have a perpetual, fully


* Confidential Treatment Requested

                                       45
<PAGE>   46
paid up, exclusive right and license in the Territory to improvements to the CTI
Knowhow or CTI Patent Rights solely developed or invented and solely owned by
Genentech under Section 7.01, and each Party shall promptly transfer any such
improvements that are in its possession or control to the other Party.

         (d) Sublicenses. If this Agreement is terminated by one Party upon the
breach of the other Party (the "Breaching Party"), all permitted sublicenses
shall continue in force, provided that in the case of the Breaching Party's
sublicensees, such sublicensee(s) cure the breach of the Breaching Party and
agree to be responsible for the obligations of the Breaching Party.

         (e) Access to Regulatory Documents. Except as otherwise provided
herein, upon termination of this Agreement neither Party shall have any right to
cross-reference or otherwise obtain the benefit of any regulatory filings made
by the other Party.

         10.08 SURVIVAL OF CERTAIN PROVISIONS. The provisions of Article VIII
(to the extent any payment obligations have accrued prior to termination), IX
and XI and Sections 10.04, 10.07 and 10.09 shall survive any termination or
expiration of this Agreement.

         10.09 ACCRUED RIGHTS, SURVIVING OBLIGATIONS. Termination,
relinquishment or expiration of this Agreement for any reason shall be without
prejudice to any rights which shall have accrued to the benefit of either Party
prior to such termination, or expiration. Such termination, relinquishment or
expiration shall not relieve either Party from obligations which are expressly
indicated to survive termination or expiration of this Agreement.

                                   ARTICLE XI

                            MISCELLANEOUS PROVISIONS

         11.01 NO PARTNERSHIP. Nothing in this Agreement is intended or shall be
deemed to constitute a partnership, agency, employer, employee or joint venture
relationship between the Parties. No Party shall incur any debts or make any



                                       46
<PAGE>   47
commitments for the other.

         11.02 ASSIGNMENTS. Except as otherwise provided herein, neither this
Agreement nor any interest hereunder shall be assignable by any Party or by
operation of law or otherwise without the prior written consent of the other;
provided, however, that either Party may assign its rights and delegate its
obligations under this Agreement, without the consent of the other Party, to any
direct or indirect wholly-owned subsidiary or to any successor by merger or sale
of substantially all of its assets to which this Agreement relates (e.g., one or
more Factors) in a manner such that the assignor shall remain liable and
responsible for the performance and observance of all its duties and obligations
hereunder, or if the assignor disappears because of such transaction, the
assignee must agree to abide by the terms and conditions of this Agreement. This
Agreement shall be binding upon the successors and permitted assigns of the
Parties and the name of a Party appearing herein shall be deemed to include the
names of such Party's successor's and permitted assigns to the extent necessary
to carry out the intent of this Agreement. Any assignment not in accordance with
this Section 11.02 shall be void.

         11.03 REPRESENTATIONS AND WARRANTIES. Each Party warrants and
represents to the other Party that, to the best of the representing and
warranting Party's knowledge: (i) it is free to enter into this Agreement; (ii)
so doing will not violate any other agreement to which it is party; and (iii) it
currently has the right to grant the licenses granted hereunder. Neither Party
makes any representation or warranty that any patent applications licensed
hereunder will issue as patents or that any patent licensed hereunder is valid
or enforceable or that the exercise of the licenses granted hereunder will not
infringe the rights of any third party.

         11.04. FORCE MAJEURE. Neither Party shall be liable to the other for
loss or damages or shall have any right to terminate this Agreement for any
default or delay (including, without limitation, an inability to supply Licensed
Product) attributable to any act of God, earthquake, flood, fire, explosion,
strike, lockout, labor dispute, casualty or accident, war, revolution, civil
commotion, act of public enemies, blockage or embargo, injunction, law, order,
proclamation, regulation, ordinance, demand or requirement of any government or
subdivision, authority (including, without limitation, drug regulatory
authorities) or representative of any such government, or any other cause beyond
the reasonable control of such Party, if the Party affected shall give



                                       47
<PAGE>   48
prompt notice of any such cause to the other Parties. The Party given such
notice shall thereupon be excused from such of its obligations hereunder as it
is so disabled and for 30 days thereafter. Notwithstanding the foregoing,
nothing in this Section 11.04 shall excuse or suspend the obligation to make any
payment due hereunder in the manner and at the time provided.

         11.05 NO TRADEMARK RIGHTS. No right, express or implied, is granted by
this Agreement to use in any manner any trade name or trademark of CTI or
Genentech in connection with the performance of this Agreement or the
exploitation of any license granted hereunder.

         11.06 PUBLIC ANNOUNCEMENTS. The Parties shall consult and obtain mutual
consent before making any public announcement concerning this Agreement or the
subject matter hereof, except as required by law or applicable rules or
regulations. Copies of press releases or similar written communications
containing a Party's name shall be provided to that Party prior to release.

         11.07 ENTIRE AGREEMENT OF THE PARTIES; AMENDMENT. This Agreement, the
Neurturin MTA, and the Stock Purchase Agreement(s) to be entered into as
provided herein constitute and contain the entire understanding and agreement of
the Parties with respect to the subject matter hereof and cancel and supersede
any and all prior negotiations, correspondence, understandings and agreements,
whether verbal or written, between the Parties respecting the subject matter
hereof, including the NGF Agreement except for those sections of the NGF
Agreement which are intended to survive expiration or termination, all of which
remain in full force and effect. No waiver, modification or amendment of any
provision of this Agreement shall be valid or effective unless made in writing
and signed by a duly authorized officer of each of the Parties.

         11.08 SEVERABILITY. In the event any one or more of the provisions of
this Agreement should for any reason be held by any court or authority having
jurisdiction over this Agreement or either of the Parties to be invalid, illegal
or unenforceable, such provision or provisions shall be validly reformed by
addition or deletion of wording as appropriate to avoid such result and as
nearly as possible approximate the intent of the Parties and, if unreformable,
shall be divisible and deleted in such jurisdiction; elsewhere, this Agreement
shall not be affected.



                                       48
<PAGE>   49
         11.09 CAPTIONS. The captions to this Agreement are for convenience
only, and are to be of no force or effect in construing or interpreting any of
the provisions of this Agreement.

         11.10 NOTICE AND DELIVERY. Any notice, requests, delivery, approval or
consent required or permitted to be given under this Agreement shall be in
writing and shall be deemed to have been sufficiently given if delivered in
person, transmitted by telegraph or telecopier (with confirmed answer-back) or
sent by registered air mail letter to the Party (which notice shall be
considered effective five days after it is sent) to whom it is directed at its
address shown below or such other address as such party shall have last given by
notice to the other Party.

IF TO CTI, ADDRESSED TO:

CytoTherapeutics, Inc.
Two Richmond Square
Providence, RI 02906
Attention: President
Telephone: (401 ) 272-3310
Telecopier: (401 ) 272-3485
with a copy addressed to the General Counsel

IF TO GENENTECH, ADDRESSED TO:

Genentech, Inc.
460 Point San Bruno Boulevard
South San Francisco, CA 94080
Attention: Corporate Secretary
Telephone: (415) 225-1000
Telecopier: (415) 952-9881

         11.11 LIMITATION OF LIABILITY. Neither Party shall be liable to the
other for indirect, incidental or consequential damages arising out of any of
the terms or conditions of this Agreement or with respect to their performance
or lack thereof.




                                       49
<PAGE>   50
         11.12 GENENTECH INDEMNIFICATION. Genentech shall indemnify, defend and
hold harmless CTI and its officers, directors, Affiliates, employees and agents
from and against all third party costs, claims, suits, expenses (including
reasonable attorneys' fees) and damages arising out of or resulting from any
willful or negligent act or omission by Genentech related to the subject matter
of this Agreement or the use by or administration to any person of any Licensed
Product that arises out of sales of Licensed Product by Genentech (except where
such cost, claim, suit, expense or damage arose or resulted from any negligent
act or omission by CTI or its sublicensees or from any defect in the manufacture
of Licensed Product by CTI or its sublicensees which was not discovered by
Genentech), provided that CTI gives reasonable notice to Genentech of any such
claim or action, tenders the defense of such claim or action to Genentech and
assists Genentech at Genentech's expense in defending such claim or action and
does not compromise or settle such claim or action without Genentech's prior
written consent.

         11.13 CTI INDEMNIFICATION. CTI shall indemnify, defend and hold
harmless Genentech and its officers, directors, Affiliates, employees and agents
from and against all third party costs, claims, suits, expenses (including
reasonable attorney's fees) and damages arising out of or resulting from any
willful or negligent act or omission by CTI relating to the subject matter of
this Agreement (except where such cost, claim, suit, expense or damage arose or
resulted from any negligent act or omission by Genentech or its sublicensees) or
from any defect in the manufacture of Licensed Product by CTI or its
sublicensees which was not discovered by Genentech, provided that Genentech
gives reasonable notice to CTI of any such claims or action, tenders the defense
of such claim or action to CTI and assists Genentech at Genentech's expense in
defending such claim or action and does not compromise or settle such claim or
action without Genentech's prior written consent.

         11.14 LIABILITY INSURANCE. Each Party shall maintain (i) prior to the
first clinical trial in humans of any Licensed Product conducted by or on behalf
of a Party comprehensive general and products liability and completed operations
insurance with at least a Best-rated A-XIV insurance company covering that
Party's activities related to this Agreement in an amount of not less than
$3,000,000 per occurrence and annual aggregate and (ii) during the remaining
term of this Agreement either (1) net worth of no less than $100,000,000 or (2)
comprehensive general and products


                                       50
<PAGE>   51
liability and completed operations insurance covering that Party's activities
related to this Agreement in an amount of not less than $3,000,000 per
occurrence and annual aggregate. Upon request, each Party shall provide to the
other satisfactory evidence of that Party's compliance with this provision. The
obligations under this Section 11.14 shall terminate upon the expiration of the
statute of limitations applicable to any liability covered by the
above-referenced insurance.

         11.15 NO AGENCY. Nothing herein shall be deemed to constitute either
Party as the agent or representative of the other Party, or both Parties as
joint venturers or partners for any purpose. Each Party shall be an independent
contractor, not an employee or partner of the other. Neither Party shall be
responsible for the acts or omissions of the other Party, and neither Party will
have authority to speak for, represent or obligate the other Party in any way
without prior written authority from the other Party.

         11.16 COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

         11.17 JOINT DRAFTING. This Agreement was jointly drafted and prepared
by both Parties hereto and no presumption in favor of or against either Party
hereto shall be deemed to exist with respect to the interpretation of any
provision to this Agreement.

         11.18 GOVERNING LAW. This Agreement shall be governed by and construed
in accordance with the laws of the State of California as applied to contracts
entered into and wholly performed within the State of California by California
residents.

         11.19 MEDIATION. The Parties agree that the prompt resolution of
disputes that may arise hereunder is of critical importance. In the case of a
dispute hereunder which the Parties fail to resolve, including, if applicable,
after referral to a "member of senior management" pursuant to Sections 2.03 or
8.08, either side may demand mediation by written notice to the other. Within 10
business days of the giving of such notice, the Parties shall agree on an
unaffiliated mediator, failing agreement within such 10 days, the Party
requesting mediation shall select the mediator from a list of mediators provided
by both Parties. Within 30 days of the choice of the mediator, each Party shall



                                       51
<PAGE>   52
submit to the other and the mediator, a brief of 20 pages or less outlining its
position. Within five business days of the exchange of briefs, the mediation
shall be held at a time and place to be selected by the Party that did not
request the mediation. In no event shall the duration of the mediation be
greater than one day unless otherwise agreed by the Parties. Each Party shall
bear all of its own expenses incurred in connection with the mediation and the
Parties shall share equally the fees and expenses of the mediator.

         11.20 ARBITRATION. In the event that the parties are unable to resolve
a dispute within 30 days after the commencement of mediation efforts under
Section 11.19, either Party may submit the matter to nonbinding arbitration in
accordance with the procedures set forth in this Section 11.20. If a party
intends to commence arbitration to resolve a dispute, such Party shall provide
written notice to the other Party of such intention, and shall designate one
arbitrator. Within 10 days of receipt of such notice, the other Party shall
designate in writing a second arbitrator. The two arbitrators so designated
shall, within 10 days thereafter, designate a third arbitrator. The arbitrators
so designated shall not be employees, consultants, officers, directors or
shareholders of or otherwise associated with either Party or an Affiliate of
either Party. The arbitration shall be conducted in accordance with the rules
of, and under the auspices of, the International Chamber of Commerce and the
location of the arbitration shall be a location in the United States selected by
the Party that did not submit the matter to arbitration hereunder. Any such
procedure shall be conducted as a "baseball" arbitration.

         Within 15 days after the designation of the third arbitrator, the
arbitrators and the Parties shall meet at which time each Party shall be
required to set forth in writing the issues which need to be resolved and a
proposed ruling on each such issue.

         The arbitrators shall set a date for a hearing, which shall be no later
than 30 days after the submission of written proposals from each Party, to
discuss each of the issues identified by the Parties. Each Party shall have the
right to be represented by counsel. The arbitrators shall have sole discretion
with regard to the admissibility of any evidence.

         The arbitrators shall use their best efforts to rule on each disputed
issue within 30 days after the completion of the hearings described above. The
arbitrators' ruling



                                       52
<PAGE>   53
shall be, in the absence of fraud or manifest error, binding and conclusive upon
both Parties and may be enforced in a court of competent jurisdiction. The
arbitrators may not award punitive or exemplary damages.

         The arbitrators shall be paid a reasonable fee plus expenses, which
fees and expenses shall be paid as designated by the arbitrators or if the
arbitrators do not so designate such costs shall be shared equally by the
Parties.

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by
their respective duly authorized officers as of the day and year set forth
below, each



                                       53
<PAGE>   54
copy of which shall for all purposes be deemed to be an original.

GENENTECH, INC.                       CYTOTHERAPEUTICS, INC.

By: /s/ Illegible Signature           By: /s/ Illegible Signature
    -----------------------               -----------------------
Title: Executive V.P.                 Title: CEO

Date: 11/21/96                        Date: 11/26/96


                                       54

<PAGE>   1
                                                                     EXHIBIT ___




                        AGREEMENT FOR CONSULTING SERVICES


This Agreement is made by and between CytoTherapeutics, Inc. (the "Company") and
Peter Simon (the "Consultant") as of December 1, 1996.

1.   SERVICES. The Consultant shall provide to the Company consulting services
     in the field referred to in Exhibit A/Item 1 or as otherwise agreed by the
     parties in accordance with the terms and conditions contained in this
     Agreement.

2.   TERM. The services provided by the Consultant to the Company shall be
     performed for the term set forth in Exhibit A/Item 2. The Consultant shall
     coordinate his work efforts and report his progress regularly to the
     individual set forth in Exhibit A/Item 3.

3.   PAYMENT FOR SERVICE RENDERED. For providing the consulting services as
     referred herein, the Company shall compensate the Consultant as set forth
     in Exhibit A/Item 4.

4.   CONSULTANT'S WARRANTIES. The Consultant hereby warrants that no other
     person has rights to his services in the specific areas described herein
     and that the Consultant is in no way compromising any rights or trust
     relationships between any other party and the Consultant, or creating a
     conflict of interest or any possibility thereof for the Consultant or for
     the Company. The Consultant further warrants that he is entitled to enter
     into this Agreement and make the assignments made herein.

5.   NATURE OF RELATIONSHIP. The Consultant is an independent contractor and
     will not act as an agent nor shall he be deemed an employee of the Company
     for the purposes of any employee benefit programs, income tax withholding,
     FICA taxes, unemployment benefits or otherwise. The Consultant shall not
     enter into any agreement or incur any obligations on the Company's behalf,
     or commit the Company in any manner without the Company's prior written
     consent.

6.   INVENTIONS, PATENTS AND TECHNOLOGY. The Consultant shall promptly and fully
     disclose to the Company any and all inventions, improvements, discoveries,
     developments, original works of authorship, trade secrets, or other
     intellectual property ("Proprietary Information") conceived, developed or
     reduced to practice by the Consultant during the performance of the
     consulting services performed for the Company hereunder. The Consultant
     shall treat

                                        1




<PAGE>   2



     all Proprietary Information as the confidential information of the Company.
     The Consultant agrees and does hereby assign to the Company and its
     successors and assigns, without further consideration, the entire right,
     title and interest in and to each of the Proprietary Information whether or
     not patentable or copyrightable. The Consultant further agrees to execute
     all applications for patents and/or copyrights, domestic or foreign,
     assignments and other papers necessary to secure and enforce rights
     relating to the Proprietary Information. The parties acknowledge that all
     original works of authorship that are made by the Consultant within the
     scope of his consulting services and that are protectable by copyright are
     "works made for hire," as that term is defined in the United States
     Copyright Act (17USCA Section 101).

7.   CONFIDENTIALITY. The Consultant agrees that he shall not use (except for
     the Company's benefit) or divulge to anyone--either during the term of this
     Agreement or thereafter--any of the Company's trade secrets, the
     Proprietary Information or other proprietary data, or information of any
     kind whatsoever acquired by the Consultant in carrying out the terms of
     this Agreement, and will turn over to the Company, or make such disposition
     thereof as - may be directed or approved by the Company, any notebook,
     data, information or other material acquired or compiled by the Consultant
     in carrying out the terms of this Agreement.

8.   TERMINATION. Either party may terminate this Agreement in the case of a
     material default hereunder by the other party which remains uncured after
     30 days written notice. In addition, the Company shall have the right to
     terminate this Agreement by giving written notice 30 days prior to the date
     of such termination. Any termination shall be effective in the manner and
     upon the date specified in said notice and shall be without prejudice to
     any claims that the Company may have against the Consultant. The Company's
     sole obligation in the event of such termination shall be to reimburse the
     Consultant for services actually performed by the Consultant up to the
     effective date of termination. Termination shall not relieve the Consultant
     of his continuing obligations under this Agreement, particularly the
     requirements of Items 6 and 7 above, which shall survive termination or
     expiration of this Agreement.

9.   CONSULTANT'S COVENANTS. Consultant agrees that he will notify the Company
     of any potential competitor of the Company for whom he works; if the
     Company determines that such a competitor creates an irreconcilable
     conflict of interest, it may terminate the Agreement immediately.


10.  MISCELLANEOUS.

     a.   No failure on the part of either party to exercise, and no delay in
exercising, any right or remedy hereunder shall operate as a waiver thereof; nor
shall any single or partial exercise of any right or remedy hereunder preclude
any other or further exercise thereof or the exercise of any other right or
remedy granted hereby, or by any related document or by law.

                                        2


<PAGE>   3




     b.   This Agreement shall be deemed to be a contract made under the law of
the State of Texas and for all purposes it, plus any related or supplemental
documents and notices, shall be construed in accordance with and governed by the
law of such state.

     c.   This Agreement may not be and shall not be deemed or construed to have
been modified, amended, rescinded, canceled or waived, in whole or in part,
except by written instruments signed by the parties hereto.

     d.   This Agreement, including the exhibits attached hereto and made a part
hereof, constitutes and expresses the entire Agreement and understanding between
the parties. All previous discussions, promises, representations and
understandings between the parties relative to this Agreement, if any, have been
merged into this document.

     e.   The Consultant may not subcontract any part or all of the services to
be provided without the prior written consent of the Company.

In witness whereof, the parties have executed this Agreement as of the date
first set forth above.

CytoTherapeutics, Inc.                            Peter Simon

By /s/ Seth Rudnick                               /s/ Peter Simon
   --------------------------                     ---------------------------
                                                  Consultant Signature

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

                                                  ---------------------------
                                                  Social Security Number








                                        3




<PAGE>   4



                                    EXHIBIT A


1.   Description of consulting services: Review and analysis of corporate
     partnering activities and other activities as directed by the Board of
     Directors.


2.   Duration of Agreement: This Agreement for Consulting Services begins on
     December 1, 1996 and will terminate on November 30, 1997.

3.   The Consultant shall report to: Seth Rudnick, M.D.

4.   Payment for services: The Company will pay the Consultant two thousand
     dollars (US$ 2000) per full day of consulting performed at the request of
     the Company. Such payments will be made within thirty (30) days of
     submission by the Consultant of signed reimbursement instructions. The
     total payments over the course of one year hereunder shall not exceed
     twenty thousand dollars (US$ 20,000).

     The Consultant will also be reimbursed for travel expenses that are
     directly related to the consulting; such expenses will be reimbursed within
     30 days of the receipt of a signed request detailing expenses (with
     receipts).







                                        4




<PAGE>   1



                               TERM LOAN AGREEMENT



                          dated as of October 22, 1996



                                     between



                             CYTOTHERAPEUTICS, INC.



                                       and



                        THE FIRST NATIONAL BANK OF BOSTON



<PAGE>   2



                               TERM LOAN AGREEMENT
                               -------------------


     This TERM LOAN AGREEMENT (this "Agreement") is made as of October 22, 1996,
by and between CYTOTHERAPEUTICS, INC. (the "Borrower"), a Delaware corporation
having its principal place of business at Two Richmond Square, Providence, Rhode
Island 02906, and THE FIRST NATIONAL BANK OF BOSTON (the "Bank"), a national
banking association with its head office at 100 Federal Street, Boston,
Massachusetts.

                                 1. DEFINITIONS:
                                    -----------

     Certain capitalized terms are defined below:

     ADVANCE. See [section]2.
 
     AGREEMENT: See preamble, which term shall include this Agreement and the
Schedules and Exhibits hereto, all as amended and in effect from time to time.

     AUTHORIZED INVESTMENT VEHICLES: Those investments permitted by the Policy.

     BANK: See preamble.

     BASE RATE: The higher of (a) the annual rate of interest announced from
time to time by the Bank at its head office as the Bank's "base rate" or (b)
one-half of one percent (1/2%) above the Federal Funds Effective Rate.

     BORROWER: See preamble.

     BUSINESS DAY: Any day on which banks in Boston, Massachusetts and
Providence, Rhode Island, are open for business generally.

     CAPITALIZED LEASES: Leases under which the Borrower is the Lessee or
obligor, the discounted, future rental payment obligations under which are
required to be capitalized on the balance sheet of the Borrower in accordance
with GAAP.

     CASH COLLATERAL ACCOUNT. That certain interest bearing account with the
Bank in the name "CytoTherapeutics, Inc. Cash Collateral Account".

     CASH COLLATERAL AGREEMENT. That certain cash collateral agreement of even
date herewith between the Borrower and the Bank, pursuant to which the Borrower
has granted to the Bank a first priority security interest in the Cash
Collateral Account and the amounts from time to time deposited therein, as the
same may be amended, restated, supplemented or modified from time to time.



<PAGE>   3



     CASH EQUIVALENTS. (a) Negotiable certificates of deposit and bankers'
acceptances, maturing in one hundred eighty (180) days or less from the date of
issue, or demand deposit or money market accounts, with any commercial bank or
trust company which is organized under the laws of the United States or of any
state thereof and which has, or which is owned by a bank holding company which
has, total assets in excess of $1,000,000,000; (b) any securities (i) which are
commonly known as "commercial paper", (ii) which are due and payable within two
hundred seventy (270) days from the date of issue, (iii) which have been issued
by any corporation organized under the laws of the United States or of any state
thereof or issued by a foreign corporation if such securities are denominated in
United States dollars, and (iv) the ratings for which, at the time of the
acquisition thereof by the Borrower are not less than "P-1" if rated by Moody's
Investors Services, Inc., and not less than "A-1" if rated by Standard and
Poor's Corporation; (c) any marketable direct or unconditionally guaranteed
obligations of the United States of America or any agency thereof which mature
within one (1) year from the date of the acquisition thereof and (d) Authorized
Investment Vehicles.

     CHARTER DOCUMENTS: In respect of any entity, the certificate or articles of
incorporation or organization and the by-laws of such entity, or other
constitutive documents of such entity.

     COLLATERAL: All of the property, rights and assets of the Borrower that are
or are intended to be subject to the security interest created by the Security
Documents.

     CONSENT: In respect of any person or entity, any permit, license or
exemption from, approval, consent of, registration or filing with any local,
state or federal governmental or regulatory agency or authority, required under
applicable law.

     DEFAULT: An event or act which with the giving of notice and/or the lapse
of time, would become an Event of Default.

     DRAWDOWN DATE: See [section]2.

     DISBURSEMENT PERIOD. See [section]2.

     ENVIRONMENTAL LAWS: All laws pertaining to environmental matters, including
without limitation, the Resource Conservation and Recovery Act, the
Comprehensive Environmental Response Compensation and Liability Act of 1980, the
Superfund Amendments and Reauthorization Act of 1986, the Federal Clean Water
Act, the Federal Clean Air Act, the Toxic Substances Control Act, in each case
as amended, and all rules, regulations, judgments, decrees, orders and licenses
arising under all such laws.

     ERISA: The Employee Retirement Income Security Act of 1974, as amended, and
all rules, regulations, judgments, decrees, and orders arising thereunder.

     EVENT OF DEFAULT: Any of the events listed in [section]8 hereof.

                                       -2-

<PAGE>   4



     FEDERAL FUNDS EFFECTIVE RATE: For any day, the rate per annum equal to the
weighted average of the rates on overnight federal funds transactions with
members of the Federal Reserve System arranged by federal funds brokers, as
published for such day (or, if such day is not a Business Day, for the next
preceding Business Day) by the Federal Reserve Bank of New York, or, if such
rate is not so published for any day that is a Business Day, the average of the
quotations for such day on such transactions received by the Bank from three
funds brokers of recognized standing selected by the Bank.

     FINANCIALS: In respect of any period, the balance sheet of any person or
entity as at the end of such period, and the related statement of operations,
statement of cash flow and statement of stockholders equity for such period,
each setting forth in comparative form the figures for the previous comparable
fiscal period, all in reasonable detail and prepared in accordance with GAAP.

     FLEET CREDIT AGREEMENT: The Loan Agreement dated as of May 15, 1996 between
the Borrower and Fleet National Bank.

     GAAP: Generally accepted accounting principles consistent with those
adopted by the Financial Accounting Standards Board and its predecessor, (a)
generally, as in effect from time to time, and (b) for purposes of determining
compliance by the Borrower with its financial covenants set forth herein, as in
effect for the fiscal year therein reported in the most recent Financials
submitted to the Bank prior to execution of this Agreement.

     HAZARDOUS MATERIALS: Any hazardous waste, as defined by 42 U.S.C.
[section]6903(5), any hazardous substances as defined by 42 U.S.C.
[section]9601(14), any pollutant or contaminant as defined by 42 U.S.C.
[section]9601(33) and any toxic substances, oil or hazardous materials or other
chemicals or substances regulated by any Environmental Laws.

     INDEBTEDNESS: In respect of any person or entity, all obligations,
contingent and otherwise, that in accordance with GAAP should be classified upon
the obligor's balance sheet as liabilities, or to which reference should be made
by footnotes thereto, including in any event and whether or not so classified:
(a) all debt and similar monetary obligations, whether direct or indirect; (b)
all liabilities secured by any mortgage, pledge, security interest, lien, charge
or other encumbrance existing on property owned or acquired subject thereto,
whether or not the liability secured thereby shall have been assumed; and (c)
all guarantees, endorsements and other contingent obligations whether direct or
indirect in respect of indebtedness of others, including any obligation to
supply funds to or in any manner to invest in, directly or indirectly, the
debtor, to purchase indebtedness, or to assure the owner of indebtedness against
loss, through an agreement to purchase goods, supplies, or services for the
purpose of enabling the debtor to make payment of the indebtedness held by such
owner or otherwise, and the obligations to reimburse the issuer in respect of
any letters of credit.

     LIENS: Any encumbrance, mortgage, pledge, hypothecation, charge,
restriction or other security interest of any kind securing any obligation of
any entity or person.

                                       -3-

<PAGE>   5



     LOAN: The term loan made or to be made to the Borrower pursuant to
[section]2 hereof.

     LOAN DOCUMENTS: This Agreement, the Note, and the Security Documents, in
each case as from time to time amended, restated, modified or supplemented.

     MARGIN: One-half of one percent (1/2%) per annum.

     MATERIALLY ADVERSE EFFECT: Any materially adverse effect on the financial
condition or business operations of the Borrower or material impairment of the
ability of the Borrower to perform its obligations hereunder or under any of the
other Loan Documents.

     MATURITY DATE: The earliest to occur of (a) October 22, 2001 and (b) such
earlier date on which the Loan may become due and payable pursuant to the terms
hereof.

     MORTGAGE: The mortgage dated as of the date hereof from the Borrower to the
Bank with respect to the fee interest of the Borrower in the Property and in
form and substance satisfactory to the Bank.

     MORTGAGED PROPERTY: The Property.

     NOTE. See [section]2.1.

     OBLIGATIONS: All indebtedness, obligations and liabilities of the Borrower
to the Bank arising or incurred under this Agreement or any other Loan Document
or in respect of the Loan or the Note or other instruments at any time
evidencing any thereof, existing on the date of this Agreement or arising
thereafter, direct or indirect, joint or several, absolute or contingent,
matured or unmatured, liquidated or unliquidated, secured or unsecured, arising
by contract, operation of law or otherwise.

     OFFICE BUILDING: The building which is being constructed on the Property.

     ORIGINAL TERM LOAN: The term loan made by the Bank to the Borrower in the
original principal amount of $1,500,000 pursuant to the Original Term Loan
Agreement and the Original Term Loan Documents.

     ORIGINAL TERM LOAN AGREEMENT: The Term Loan Agreement dated as of September
30, 1994 between the Borrower and the Bank, as the same may be amended,
restated, modified or supplemented from time to time, pursuant to which the Bank
made the Original Term Loan to the Borrower.

     ORIGINAL TERM LOAN DOCUMENTS: The "Loan Documents" as such term is defined
in the Original Term Loan Agreement.

     PERMITTED LIENS: See [section]7.2(b).

                                       -4-

<PAGE>   6



     POLICY: The Borrower's Investment Policy, a copy of which is attached
hereto as Exhibit A.

     PROJECT COSTS: The aggregate cost of acquiring the Property, developing and
constructing the Office Building to be located thereon and completing the
contemplated improvements and renovations thereon.

     PROPERTY: The real property located at 701 Washington Highway, Lincoln,
Rhode Island, which real property is subject to the Mortgage.

     REQUIREMENT OF LAW: In respect of any person or entity, any law, treaty,
rule, regulation or determination of an arbitrator, court, or other governmental
authority, in each case applicable to or binding upon such person or entity or
affecting any of its property.

     SECURITY DOCUMENTS: Collectively, the Cash Collateral Agreement and the
Mortgage, and all instruments and documents required to be delivered pursuant
thereto.

     SURVEY: In relation to the Mortgaged Property, an instrument survey of such
Mortgaged Property dated as of a date subsequent to August 1, 1996, which shall
show the location of all buildings, structures, easements and utility lines on
such Mortgaged Property, shall be sufficient to remove the survey exception from
the Title Policy, shall show that all buildings and structures are within the
lot lines of such Mortgaged Property, shall not show any encroachments by
others, shall show the zoning district or districts in which such Mortgaged
Property is located in a flood hazard district as established by the Federal
Emergency Management Agency or any successor agency or is located in any flood
plain, flood hazard or wetland protection district established under federal,
state or local law.

     SURVEYOR CERTIFICATE: In relation to the Mortgaged Property for which a
Survey has been conducted, a certificate executed by the surveyor who prepared
such Survey dated as of a recent date and containing such information relating
to such Mortgaged Property as the Bank or the Title Insurance Company may
require, such certificate to be satisfactory to the Bank in form and substance.

     TANGIBLE NET WORTH: The excess of (a) all assets of the Borrower determined
in accordance with GAAP, over (b) all liabilities of the Borrower determined in
accordance with GAAP, minus (c) the sum of (i) the book value all intangibles
determined in accordance with GAAP, including good will and intellectual
property, and (ii) any write-up in the book value of assets since the most
recent audited Financials in existence on the date hereof.

     TITLE INSURANCE COMPANY: Commonwealth Title Insurance Co., Inc.

     TITLE POLICY: In relation to the Mortgaged Property, an ALTA standard form
title insurance policy issued by the Title Insurance Company (with such
reinsurance or co-insurance as the Bank may require, any such reinsurance to be
with direct access endorsements) in such amount as may be

                                       -5-

<PAGE>   7



determined by the Bank insuring the priority of the Mortgage or such Mortgaged
Property and that the Borrower holds marketable fee simple title to such
Mortgaged Property, subject only to the encumbrances permitted by such Mortgage
and which shall not contain exceptions for mechanics liens, persons in occupancy
or matters which would be shown by a survey (except as may be permitted by such
Mortgage), shall not insure over any matter except to the extent that any such
affirmative insurance is acceptable to the Bank in its sole discretion, and
shall contain such endorsements and affirmative insurance as the Bank in its
discretion may require, including but not limited to (a) comprehensive
endorsement and (b) variable rate of interest endorsement.

     TOTAL LIABILITIES: All liabilities of the Borrower that in accordance with
GAAP are properly classified as liabilities.

     UNENCUMBERED CASH: The sum of (a) the Borrower's cash held in demand
deposit accounts or interest bearing accounts at any financial institution, plus
(b) the Borrower's Cash Equivalents.

                          2. TERM LOAN CREDIT FACILITY.
                             -------------------------

     2.1. THE TERM LOAN.
          -------------
 
     (a) Subject to the terms and conditions of this Agreement (including, but
not limited to those requirements set forth in paragraph (b) below), the Bank
agrees during the Disbursement Period (as hereinafter defined), upon the request
of the Borrower, to make up to a maximum of five (5) Advances (as hereinafter
defined) of the Loan to the Borrower. The aggregate amount of all Advances of
the Loan shall be in the maximum principal amount of $5,500,000 or so much
thereof as shall have been disbursed during the Disbursement Period. The Loan
shall be evidenced by a promissory note of the Borrower, in form and substance
satisfactory to the Bank (the "Note"), dated as of the date hereof and payable
to the order of the Bank.

     (b) Advances of principal may be requested by the Borrower during the
period running from the date of this Agreement through and including October 31,
1997 (the "Disbursement Period") on the following terms and conditions (each
portion of the Loan so advanced being an "Advance"), PROVIDED, HOWEVER, the
Borrower shall not make more than five (5) separate requests for Advances during
the Disbursement Period. The Borrower shall notify the Bank in writing not later
than 11:00 a.m. (Boston time) on the day prior to the date on which the Advance
is to be made (both of which days must be Business Days (the "Drawdown Date") of
the proposed Drawdown Date of such Advance and of the principal amount of the
Advance. Each such request for an Advance shall be irrevocable and binding on
the Borrower and shall obligate the Borrower to accept the Advance requested
from the Bank on the proposed Drawdown Date. Each request for an Advance shall
be in a minimum amount of $750,000 and shall be accompanied by a written
certification from the Borrower that the proceeds of such Advance are being used
solely to finance the Project Costs (which Project Costs to date shall not be
less than the amount of the Advance requested). Subject to the foregoing, and
subject to the conditions set forth in [section]6, so long as no Default or
Event of Default shall have occurred and is continuing and all the applicable
conditions set forth in this

                                       -6-

<PAGE>   8



Agreement have been met, including, but not limited to, the Borrower taking all
action necessary to perfect the Bank's security interest in the Property and the
Office Building, the Bank shall advance the amount requested to a bank account
designated by the Borrower in writing in immediately available funds not later
than the close of business on such Drawdown Date.

     2.2. INTEREST.
          --------
 
     So long as no Event of Default is continuing, the Borrower shall pay
interest on the principal amount of the Loan (or that portion which has been
advanced to the Borrower pursuant to [section]2.1) at a rate per annum which is
equal to the sum of (a) the Base Rate, and (b) the Margin, such interest to be
payable in arrears on the first day of each calendar month for the immediately
preceding calendar month, commencing with the first such day following the date
hereof. While an Event of Default with respect to [section]8(a) or (b) or
[section]7.3 is continuing, amounts payable under any of the Loan Documents
shall bear interest (compounded monthly and payable on demand in respect of
overdue amounts) at a rate per annum which is equal to the sum of (a) the Base
Rate, and (b) two percent (2%) above the rate of interest otherwise applicable
to the Loan until such amount is paid in full or (as the case may be) such Event
of Default has been cured or waived in writing by the Bank (after as well as
before judgment).

     2.3. REPAYMENTS AND PREPAYMENTS.
          --------------------------

     The Borrower hereby promises to pay to the Bank the principal amount of the
Loan in sixteen (16) consecutive equal quarterly installments of 1/40th of the
total amount of the Loan, with each such installment due on the last Business
Day of each calendar quarter, commencing September 30, 1997, and with a final
payment of the full amount of the remaining balance of the Loan on the Maturity
Date. The Borrower may elect to prepay the outstanding principal of all or any
part of the Loan, without premium or penalty, in a minimum amount of $100,000 or
an integral multiple thereof, upon written notice to the Bank given by 10:00
a.m. Boston time on the date of such prepayment, of the amount to be prepaid.
Each repayment or prepayment of principal of the Loan shall be accompanied by
payment of the unpaid interest accrued to such date on the principal being
repaid or prepaid and shall be applied against the scheduled installments of
principal due on the Loan in the inverse order of maturity. No amount repaid
with respect to the Loan may be reborrowed.

     2.4. CASH COLLATERAL ACCOUNT.
          -----------------------

     (a) Prior to the date hereof, the Borrower has established with the Bank
the Cash Collateral Account. Pursuant to the terms of the Cash Collateral
Agreement, the Borrower is granting to the Lender a first priority security
interest in the Cash Collateral Account and the amounts from time to time
deposited therein.

     (b) In the event that the Borrower's Unencumbered Cash at any time is equal
to or less than $25,000,000 but greater than $20,000,000, the Borrower shall, on
the date such amount equals or falls below $25,000,000, cause to be deposited in
the Cash Collateral Account as cash collateral

                                       -7-

<PAGE>   9



for the Obligations an amount which is necessary to make the total amount in the
Cash Collateral Account equal to or greater than twenty-five percent (25%) of
the Obligations.

     (c) In the event that the Borrower's Unencumbered Cash at any time is equal
to or less than $20,000,000 but greater than $15,000,000, the Borrower shall, on
the date such amount equals or falls below $20,000,000, cause to be deposited in
the Cash Collateral Account as cash collateral for the Obligations an amount
which is necessary to make the total amount in the Cash Collateral Account equal
to or greater than fifty percent (50%) of the amount of the Obligations.

     (d) If at any time the amount of the Borrower's Unencumbered Cash is equal
to or less than $15,000,000, the Borrower shall on the date such amount equals
or falls below $15,000,000 cause to be deposited in the Cash Collateral Account
as cash collateral for the Obligations an amount which is necessary to make the
total amount in the Cash Collateral Account equal to or greater than one hundred
percent (100%) of the amount of the Obligations.

     (e) Notwithstanding anything to the contrary contained herein, in the event
that the Borrower is required to deposit in the Cash Collateral Account an
amount which is necessary to make the total amount in the Cash Collateral
Account (i) equal to or greater than one hundred percent (100%) of the amount of
the Obligations, and does in fact make such a deposit, and subsequent to making
such deposit demonstrates to the satisfaction of the Bank that the amount of the
Borrower's Unencumbered Cash is greater than $30,000,000 and has been greater
than $30,000,000 for thirty (30) consecutive days, the Bank shall release all
amounts in the Cash Collateral Account, PROVIDED, HOWEVER, the Borrower shall
remain subject to the provisions of this [section]2; and (ii) equal to or
greater than twenty five percent of the amount of the Obligations but less than
100% of the amount of the Obligations, and does in fact make such a deposit or
deposits, and subsequent thereto demonstrates to the satisfaction of the Bank
that the amount of the Borrower's Unencumbered Cash is greater than $40,000,000
and has been greater than $40,000,000 for thirty (30) consecutive days, the Bank
hall release all amounts in the Cash Collateral Account, PROVIDED, HOWEVER, the
Borrower shall remain subject to the provisions of this [section]2.

                          3. CHANGES IN CIRCUMSTANCES.
                             ------------------------

     If after the date hereof the Bank determines that (a) the adoption of or
any change in any banking law, rule, regulation or guideline or the
administration thereof (whether or not having the force of law), or (b)
compliance by the Bank or its parent bank holding company with any guideline,
request or directive (whether or not having the force of law), has the effect of
reducing the return on the Bank's or such holding company's capital as a
consequence of the Loan to a level below that which the Bank or such holding
company could have achieved but for such adoption, change or compliance by any
amount deemed by the Bank to be material, the Bank may notify the Borrower
thereof. The Borrower agrees to pay the Bank the amount of the Borrower's
allocable share of the amount of such reduction in the return on capital as and
when such reduction is determined, upon presentation by the Bank of a statement
in the amount and setting forth the Bank's calculation thereof, which statement
shall be deemed true and correct absent manifest error. The Bank agrees

                                       -8-

<PAGE>   10



to allocate shares of such reduction among the Borrower and the Bank's other
customers similarly situated on a fair and non-discriminatory basis.

                              4. FEES AND PAYMENTS.
                                 -----------------
 
     The Borrower agrees to pay to the Bank a commitment fee calculated at the
rate per annum which is equal to one-half of one percent (1/2%) on the average
daily amount during each calendar quarter or portion thereof from the date of
this Agreement to October 22, 1997 on the difference between $5,500,000 and the
total amount of funds advanced by the Bank through such calendar quarter
(including any advance which has been repaid). The commitment fee shall be
payable quarterly in arrears on the first day of each calendar quarter for the
immediately preceding calendar quarter commencing on the first such date
following the date hereof, with a final payment on October 22, 1997 or any
earlier date on which the Bank's commitment to make any Advances to the Borrower
shall terminate. All payments to be made by the Borrower hereunder or under any
of the other Loan Documents shall be made in U.S. dollars in immediately
available funds at the Bank's head office at 100 Federal Street, Boston,
Massachusetts, without set-off or counterclaim and without any withholding or
deduction whatsoever. The Bank shall be entitled to charge any account of the
Borrower with the Bank for any sum due and payable by the Borrower to the Bank
hereunder or under any of the other Loan Documents. If any payment hereunder is
required to be made on a day which is not a Business Day, it shall be paid on
the immediately succeeding Business Day, with interest and any applicable fees
adjusted accordingly. All computations of interest or of the commitment fee
payable hereunder shall be made by the Bank on the basis of actual days elapsed
and on a 360-day year.

                       5. REPRESENTATIONS AND WARRANTIES.
                          ------------------------------

     The Borrower represents and warrants to the Bank on the date hereof and on
each Drawdown Date that:

          (a) the Borrower is duly organized, validly existing, and in good
     standing under the laws of its jurisdiction of incorporation and is duly
     qualified and in good standing in every other jurisdiction where it is
     doing business and where such qualification is necessary except where a
     failure to be so qualified would not have a Materially Adverse Effect, and
     the execution, delivery and performance by the Borrower of the Loan
     Documents to which it is a party (i) are within its corporate authority,
     (ii) have been duly authorized, (iii) do not conflict with or contravene
     its Charter Documents;

          (b) upon execution and delivery thereof, each Loan Document shall
     constitute the legal, valid and binding obligation of the Borrower,
     enforceable in accordance with its terms; except as enforceability is
     limited by bankruptcy, insolvency, reorganization, moratorium or other laws
     relating to or affecting generally the enforcement of creditors' rights and
     except to the extent the availability of the remedy of specific performance
     or injunctive relief is subject to the discretion of the court before which
     any proceeding therefor may be brought;

                                       -9-

<PAGE>   11




          (c) the Borrower has good and marketable title to all its material
     properties, subject only to Permitted Liens, and possesses all assets,
     including intellectual properties, franchises and Consents, adequate for
     the conduct of its business as now conducted, without known conflict with
     any rights of others. The Borrower maintains insurance with financially
     responsible insurers, copies of the policies for which have been previously
     delivered to the Bank, covering such risks and in such amounts and with
     such deductibles as are customary in the Borrower's business and are
     adequate;

          (d) the Borrower has provided to the Bank its audited Financials as at
     December 31, 1995 and its unaudited Financials for the fiscal quarter ended
     June 30, 1996, and such Financials are complete and correct and fairly
     present the position of the Borrower as at such date and for such period in
     accordance with GAAP consistently applied. The Borrower has also provided
     to the Bank its forecast of the operations of the Borrower for the period
     from fiscal year 1997 through fiscal year 2000, and such forecast has been
     prepared in good faith based upon reasonable assumptions;

          (e) since December 31, 1995 there has been no materially adverse
     change of any kind in the Borrower which would have a Materially Adverse
     Effect;

          (f) there are no legal or other proceedings or investigations pending
     or, to the best of the Borrower's knowledge, threatened against the
     Borrower before any court, tribunal or regulatory authority which would, if
     adversely determined, alone or together, have a Materially Adverse Effect;

          (g) the execution, delivery, performance of its obligations, and
     exercise of its rights under the Loan Documents by the Borrower, including
     borrowing under this Agreement (i) do not require any Consents; and (ii)
     are not and will not be in conflict with or prohibited or prevented by (A)
     any Requirement of Law as now in effect, or (B) any Charter Document,
     corporate minute or resolution, instrument, agreement or provision thereof,
     in each case binding on it or affecting its property;

          (h) the Borrower is not in violation of (i) any Charter Document,
     corporate minute or resolution, (ii) any instrument or agreement, in each
     case binding on it or affecting its property, or (iii) any Requirement of
     Law, in a manner which could have a Materially Adverse Effect, including,
     without limitation, all applicable federal and state tax laws, ERISA and
     Environmental Laws;

          (i) upon execution and delivery of the Security Documents and the
     filing of documents thereby required, the Bank shall have first-priority
     perfected Liens on the Collateral, subject only to Liens permitted
     hereunder and entitled to priority under applicable law, with no financing
     statements, chattel mortgages, real estate mortgages or similar filings on
     record anywhere which conflict with such first-priority Liens of the Bank;
     and

                                      -10-

<PAGE>   12




          (j) the Borrower has no subsidiaries and, except as set forth on
     SCHEDULE 5(j) hereto, is not a party to any partnership or joint venture.

                            6. CONDITIONS PRECEDENT.
                               --------------------
 
     In addition to the making of the foregoing representations and warranties
and the delivery of the Loan Documents and such other documents and the taking
of such actions as the Bank may reasonably require at or prior to the time of
executing this Agreement, the obligation of the Bank to make the Loan (or any
Advance) to the Borrower hereunder is subject to the satisfaction of the
following further conditions precedent:

          (a) each of the representations and warranties of the Borrower to the
     Bank herein, in any of the other Loan Documents or any documents,
     certificate or other paper or notice in connection herewith shall be true
     and correct in all material respects as of the time made or claimed to have
     been made;

          (b) no Default or Event of Default shall be continuing;

          (c) all proceedings in connection with the transactions contemplated
     hereby shall be in form and substance reasonably satisfactory to the Bank,
     and the Bank shall have received all information and documents as it may
     have reasonably requested;

          (d) no change shall have occurred in any law or regulation or in the
     interpretation thereof that in the reasonable opinion of the Bank would
     make it unlawful for the Bank to make the Loan or any Advance;

          (e) the Borrower shall have delivered to the Bank by not later than
     October 22, 1996 (i) certified copies of the Charter Documents; (ii)
     evidence that all corporate action necessary for the valid execution,
     delivery and performance by the Borrower of the Loan Documents has been
     duly and effectively taken; (iii) an incumbency certificate signed by a
     duly authorized officer of the Borrower, and giving the name and bearing a
     specimen signature of each individual who shall be authorized to sign, in
     the name and on behalf of the Borrower, each of the Loan Documents and to
     give notices and to take action on the Borrower's behalf under the Loan
     Documents; (iv) favorable legal opinions addressed to the Bank in form and
     substance satisfactory to the Bank from counsel to the Borrower; (v) an
     updated Survey for the Mortgaged Property together with a Surveyor
     Certificate relating thereto and evidence of payment of real estate taxes
     and municipal charges on all the Property not delinquent on or before
     October 22, 1996; (vi) a Title Policy covering the Mortgaged Property (or
     commitments to issue such policies, with all conditions to issuance of the
     Title Policy deleted by an authorized agent of the Title Insurance Company)
     together with proof of payment of all fees and premiums for such policies,
     from the Title Insurance Company and in amounts satisfactory to the Bank,
     insuring the interests of the Bank as

                                      -11-

<PAGE>   13



     mortgagee under the Mortgage; and (vii) a hazardous waste site assessment
     from environmental engineers and in form and substance satisfactory to the
     Bank, covering the Mortgaged Property; and

          (f) the Borrower shall have deposited in the Cash Collateral Account
     all amounts as are then required, if any, pursuant to [section]2.4.

                                  7. COVENANTS.
                                     ---------

     7.1. AFFIRMATIVE COVENANTS.
          ---------------------
 
     The Borrower agrees that until the obligation of the Bank, if any, to make
Advances pursuant to [section]2 shall terminate and the payment and satisfaction
in full of all the Obligations, the Borrower will comply with its obligations as
set forth throughout this Agreement and to:

          (a) furnish the Bank: (i) as soon as available but in any event within
     ninety (90) days after the close of each fiscal year, its audited
     Financials for such fiscal year, certified by the Borrower's accountants;
     (ii) as soon as available but in any event within forty-five (45) days
     after the end of each fiscal quarter its unaudited Financials for such
     quarter, certified by its chief financial officer; (iii) as soon as
     available but in any event within thirty (30) days after the end of each
     month in each fiscal year, its unaudited monthly Financials for such month,
     certified by its chief financial officer; (iv) as soon as available but in
     any event within ten (10) days of receipt thereof a copy of the
     accountant's management letter; and (v) together with the quarterly,
     monthly and annual audited Financials referred to in (i), (ii) and (iii)
     above, a certificate of the Borrower setting forth computations
     demonstrating compliance with the Borrower's financial covenants set forth
     herein, and certifying that no Default or Event of Default has occurred, or
     if it has, the actions taken by the Borrower with respect thereto;

          (b) keep true and accurate books of account in accordance with GAAP,
     maintain its current fiscal year and permit the Bank or its designated
     representatives to inspect the Borrower's premises during normal business
     hours, to examine and be advised as to such or other business records upon
     the request of the Bank, and to permit the Bank's commercial finance
     examiners to conduct periodic commercial finance examinations;

          (c) (i) maintain its corporate existence, business and assets, (ii)
     keep its business and assets adequately insured, (iii) maintain its chief
     executive office in the United States, (iv) continue to engage in the same
     lines of business, and (v) comply with all Requirements of Law, including
     ERISA and Environmental Laws the noncompliance with which would have a
     Material Adverse Effect;

          (d) notify the Bank promptly in writing of (i) the occurrence of any
     Default or Event of Default, (ii) any noncompliance with ERISA or any
     Environmental Law or

                                      -12-

<PAGE>   14



     proceeding in respect thereof which could have a Materially Adverse Effect,
     (iii) any change of address, (iv) any threatened or pending litigation or
     similar proceeding affecting the Borrower or any material change in any
     such litigation or proceeding previously reported that would have a
     Materially Adverse Effect and (v) claims against any assets or properties
     of the Borrower encumbered in favor of the Bank;

          (e) use the proceeds of the Loan solely to finance the acquisition of
     the Mortgaged Property and the Project Costs, and not for the carrying of
     "margin security" or "margin stock" within the meaning of Regulations U and
     X of the Board of Governors of the Federal Reserve System, 12 C.F.R. Parts
     221 and 224;

          (f) provide the Bank with evidence that upon the completion of the
     Office Building and the contemplated improvements and renovations thereto
     and to the Mortgaged Property, the Borrower has contributed to the payment
     of the Project Costs (which contribution shall not be funded with the
     proceeds of any Advance) the greater of (i) $2,000,000 in cash and (ii) an
     amount in cash equal to twenty seven percent (27%) of the aggregate amount
     of the Project Costs and, in the event the amount of the Loan exceeds
     seventy three percent (73%) of the Project Costs, the Borrower shall
     immediately pay the amount of such excess to the Bank for application to
     the outstanding principal amount of the Loan, to be applied in the inverse
     order of maturity; and

          (g) cooperate with the Bank, take such action, execute such documents,
     and provide such information as the Bank may from time to time reasonably
     request in order further to effect the transactions contemplated by and the
     purposes of the Loan Documents, including without limitation, where
     required by [section]2.13 of the Mortgage, assisting the Bank in obtaining
     one or more environmental assessments or audits of the Mortgaged Property
     prepared by a hydrogeologist, an independent engineer or other qualified
     consultant or expert approved by the Bank to evaluate or confirm whether
     any Hazardous Materials are present in the soil or water at such Mortgaged
     Property and whether the use and operation of such Mortgaged Property
     complies with all Environmental Laws. Environmental assessments may include
     without limitation detailed visual inspections of such Mortgaged Property
     including any and all storage areas, storage tanks, drains, dry wells and
     leaching areas, and the taking of soil samples, surface water samples and
     ground water samples, as well as such other investigations or analysis as
     the Bank deems appropriate. Subject to the foregoing, all such
     environmental assessments shall be conducted and made at the expense of the
     Borrower.

     7.2. NEGATIVE COVENANTS.
          ------------------

     The Borrower agrees that until the obligation of the Bank, if any, to make
Advances pursuant to [section]2 shall terminate and the payment and satisfaction
in full of all the Obligations, the Borrower will not:


                                      -13-

<PAGE>   15



          (a) create, incur or assume any Indebtedness other than (i)
     Indebtedness to the Bank (including, without limitation, Indebtedness to
     the Bank incurred under the Original Term Loan Agreement), (ii)
     Indebtedness in respect of the acquisition of property which does not
     exceed $2,000,000 in the aggregate, (iii) current liabilities of the
     Borrower not incurred through the borrowing of money or the obtaining of
     credit except credit on an open account customarily extended, (iv)
     Indebtedness in respect of taxes or other governmental charges contested in
     good faith and by appropriate proceedings and for which adequate reserves
     have been taken; and (v) Indebtedness not included above and listed on
     SCHEDULE 7.2(a) hereto;

          (b) create or incur any Liens on any of the property or assets of the
     Borrower except (i) Liens securing the Obligations; (ii) Liens securing
     taxes or other governmental charges not yet due; (iii) deposits or pledges
     made in connection with social security obligations; (iv) Liens of
     carriers, warehousemen, mechanics and materialmen, less than 120 days old
     as to obligations not yet due; (v) easements, rights-of-way, zoning
     restrictions and similar minor Liens which individually and in the
     aggregate do not have a Materially Adverse Effect; (vi) purchase money
     security interests in or purchase money mortgages on real or personal
     property other than the Mortgaged Property securing purchase money
     Indebtedness permitted by [section]7.2(a)(ii) and [section]7.2(a)(v),
     covering only the property so acquired; (viii) liens and encumbrances on
     the Mortgaged Property as and to the extent permitted by the Mortgage; and
     (viii) other Liens existing on the date hereof and listed on SCHEDULE
     7.2(b) hereto (collectively, the "Permitted Liens");

          (c) make any investments other than (i) investments in (1) marketable
     obligations of the United States maturing within one (1) year, (2)
     certificates of deposit, bankers' acceptances and time and demand deposits
     of United States banks having total assets in excess of $1,000,000,000, or
     (3) such other investments as the Bank may from time to time approve in
     writing; (ii) investments made by the Borrower pursuant to the terms and
     conditions of the Policy; and (iii) other Investments existing on the date
     hereof and listed on SCHEDULE 7.2(c) hereto;

          (d) make any distributions on or in respect of its capital of any
     nature whatsoever, other than dividends payable solely in shares of common
     stock other than as contemplated and described on Schedule 7.2(d) hereto;
     or

          (e) become party to a merger or party to any sale-leaseback
     transaction in excess of $10,000,000 during the term of this Agreement, or
     to effect any disposition of assets other than in the ordinary course, or
     to purchase, lease or otherwise acquire assets other than in the ordinary
     course.


                                      -14-

<PAGE>   16



     7.3. FINANCIAL COVENANTS.
          -------------------

          The Borrower agrees that until the obligation of the Bank, if any, to
     make Advances pursuant to [section]2 shall terminate and the payment and
     satisfaction in full of all the Obligations, the Borrower will not permit
     the ratio of Total Liabilities to Tangible Net Worth to exceed .50 to 1 at
     any time.

                       8. EVENTS OF DEFAULT; ACCELERATION.
                          -------------------------------

     If any of the following events ("Events of Default") shall occur:

          (a) the Borrower shall fail to pay when due and payable any principal
     of the Loan when the same becomes due;

          (b) the Borrower shall fail to pay interest on the Loan or any other
     sum due under any of the Loan Documents within two (2) Business Days after
     notice from the Bank as to the amount(s) due and payable;

          (c) the Borrower shall fail to perform any term, covenant or agreement
     contained in [sections]7.1(a), 7.1(d) through (f), 7.2, 7.3 or in the 
     Mortgage;

          (d) the Borrower shall fail to perform any other term, covenant or
     agreement contained in the Loan Documents within fifteen (15) days after
     the Bank has given written notice of such failure to the Borrower;

          (e) any representation or warranty of the Borrower in the Loan
     Documents or in any certificate or notice given in connection therewith
     shall have been false or misleading in any material respect at the time
     made or deemed to have been made;

          (f) the Borrower shall be in default (after any applicable period of
     grace or cure period) under the Original Term Loan Agreement, the Fleet
     Credit Agreement or any agreement or agreements evidencing Indebtedness
     owing to a person or entity other than the Bank or any affiliates of the
     Bank or in excess of $500,000 in aggregate principal amount, or shall fail
     to pay such Indebtedness when due, or within any applicable period of
     grace;

          (g) any of the Loan Documents shall cease to be in full force and
     effect,

          (h) the Borrower (i) shall make an assignment for the benefit of
     creditors, (ii) shall be adjudicated bankrupt or insolvent, (iii) shall
     seek the appointment of, or be the subject of an order appointing, a
     trustee, liquidator or receiver as to all or part of its assets, (iv) shall
     commence, approve or consent to, any case or proceeding under any
     bankruptcy, reorganization or similar law and, in the case of an
     involuntary case or proceeding, such case or proceeding is not dismissed
     within forty-five (45) days following the commencement

                                      -15-

<PAGE>   17



     thereof, or (v) shall be the subject of an order for relief in an
     involuntary case under federal bankruptcy law;

          (i) the Borrower shall be unable to pay its debts as they mature;

          (j) there shall remain undischarged for more than thirty (30) days any
     final judgment or execution action against the Borrower that, together with
     other outstanding claims and execution actions against the Borrower exceeds
     $500,000 in the aggregate;

     THEN, or at any time thereafter:

          (1) In the case of any Event of Default under clause (h) or (i), the
     obligation of the Bank, if any, to make any Advances pursuant to [section]2
     shall terminate, and the entire unpaid principal amount of the Loan, all
     interest accrued and unpaid thereon, and all other amounts payable
     thereunder and under the other Loan Documents shall automatically become
     forthwith due and payable, without presentment, demand, protest or notice
     of any kind, all of which are hereby expressly waived by the Borrower; and

          (2) In the case of any Event of Default other than (h) and (i), the
     Bank may, by written notice to the Borrower, terminate the obligation of
     the Bank, if any, to make Advances pursuant to [section]2 hereof and/or
     declare the unpaid principal amount of the Loan, all interest accrued and
     unpaid thereon, and all other amounts payable hereunder and under the other
     Loan Documents to be forthwith due and payable, without presentment,
     demand, protest or further notice of any kind, all of which are hereby
     expressly waived by the Borrower.

     No remedy herein conferred upon the Bank is intended to be exclusive of any
other remedy and each and every remedy shall be cumulative and in addition to
every other remedy hereunder, now or hereafter existing at law or in equity or
otherwise.

                                   9. SETOFF.
                                      ------

     Regardless of the adequacy of any collateral for the Obligations, any
deposits or other sums credited by or due from the Bank to the Borrower may be
applied to or set off against any principal, interest and any other amounts due
from the Borrower to the Bank at any time without notice to the Borrower, or
compliance with any other procedure imposed by statute or otherwise, all of
which are hereby expressly waived by the Borrower; PROVIDED, HOWEVER, that funds
held in the Cash Collateral Account may not be applied by the Bank for
obligations owing to the Bank under the Original Term Loan Agreement.


                                      -16-

<PAGE>   18



                               10. MISCELLANEOUS.
                                   -------------

     The Borrower agrees to indemnify and hold harmless the Bank and its
officers, employees, affiliates, agents, and controlling persons from and
against all claims, damages, liabilities and losses of every kind arising out of
the Loan Documents, including without limitation, against those in respect of
the application of Environmental Laws to the Borrower, other than those claims,
damages, liabilities and losses arising solely from the Bank's gross negligence
or willful misconduct. The Borrower shall pay to the Bank promptly on demand all
reasonable costs and out-of-pocket expenses (including any taxes and reasonable
legal and other professional fees and fees of its commercial finance examiner)
incurred by the Bank in connection with the preparation, negotiation, execution,
amendment, administration or enforcement of any of the Loan Documents. Any
communication to be made hereunder shall (a) be made in writing, but unless
otherwise stated, may be made by telex, facsimile transmission, courier or
letter, and (b) be made or delivered to the address of the party receiving
notice which is identified with its signature below (unless such party has by
five (5) days written notice specified another address), and shall be deemed
made or delivered, when dispatched, left at that address, or five (5) days after
being mailed, postage prepaid, to such address. This Agreement shall be binding
upon and inure to the benefit of each party hereto and its successors and
assigns, but the Borrower may not assign its rights or obligations hereunder.
The Bank shall be permitted to assign its rights and obligations hereunder (with
the consent of the Borrower provided that no Event of Default shall have
occurred and be continuing, which consent shall not be unreasonably withheld).
This Agreement may not be amended or waived except by a written instrument
signed by the Borrower and the Bank, and any such amendment or waiver shall be
effective only for the specific purpose given. The Bank agrees to exercise
reasonable efforts to keep any information delivered or made available by the
Borrower to it confidential from anyone other than persons employed or retained
by the Bank, including legal counsel, who are or are expected to become engaged
in evaluating, approving, structuring or administering the Loan; provided,
however, that nothing herein shall prevent the Bank from disclosing such
information (a) upon the order of any court or administrative agency, (b) upon
the request or demand of any regulatory agency or authority having jurisdiction
over the Bank, (c) which has been publicly disclosed by or on behalf of the
Borrower, (d) to the extent reasonably required in connection with any
litigation to which the Bank or its affiliates may be a party, (e) to the extent
reasonably required in connection with any audits or accountings and (f) to any
actual or proposed participant, assignee or other transferee of all or part of
its rights hereunder which has agreed in writing to be bound by the provisions
of the [section]10. The Bank agrees to provide the Borrower of notice of any
required disclosure of information hereunder, unless the Bank is prohibited from
noticing the Borrower or the Bank determines in its sole discretion that such a
notice would have a material adverse effect on the Bank. No failure or delay by
the Bank to exercise any right hereunder shall operate as a waiver thereof, nor
shall any single or partial exercise of any right, power or privilege preclude
any other right, power or privilege. The provisions of this Agreement are
severable and if any one provision hereof shall be held invalid or unenforceable
in whole or in part in any jurisdiction, such invalidity or unenforceability
shall affect only such provision in such jurisdiction. This Agreement, together
with all Schedules hereto, expresses the entire understanding of the parties
with respect to the transactions contemplated hereby. This Agreement and any
amendment hereby may be executed in several counterparts, each

                                      -17-

<PAGE>   19



of which shall be an original, and all of which shall constitute one agreement.
In proving this Agreement, it shall not be necessary to produce more than one
such counterpart executed by the party to be charged. THIS AGREEMENT AND THE
NOTE ARE CONTRACTS UNDER THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS AND SHALL
BE CONSTRUED IN ACCORDANCE THEREWITH AND GOVERNED THEREBY. THE BORROWER AGREES
THAT ANY SUIT FOR THE ENFORCEMENT OF ANY OF THE LOAN DOCUMENTS MAY BE BROUGHT IN
THE COURTS OF THE COMMONWEALTH OF MASSACHUSETTS OR ANY FEDERAL COURT SITTING
THEREIN. The Borrower, as an inducement to the Bank to enter into this
Agreement, hereby waives its right to a jury trial with respect to any action
arising in connection with any Loan Document.



                                      -18-

<PAGE>   20



     IN WITNESS WHEREOF, the undersigned have duly executed this Term Loan
Agreement as a sealed instrument as of the date first above written.

                                             CYTOTHERAPEUTICS, INC.



                                             By: 
                                                --------------------------------
                                                 Name:
                                                 Title:

                                             Address:

                                             Two Richmond Square
                                             Providence, Rhode Island 02906

                                             Tel:   (401) 272-3310
                                             Fax:  (401) 272-3485

                                             THE FIRST NATIONAL BANK OF
                                             BOSTON


                                             By: 
                                                --------------------------------
                                                 Name:  Elizabeth C. Everett
                                                 Title: Director

                                             High Technology Division
                                             100 Federal Street, 01-08-04
                                             Boston, Massachusetts  02110
                                             Tel:   (617) 434-2318
                                             Fax:  (617) 434-0819


                                      -19-

<PAGE>   21



                                  SCHEDULE 5(j)
                                  -------------


                                 Joint Ventures




<PAGE>   22



                                 SCHEDULE 7.2(a)
                                 ---------------


                                  Indebtedness



<PAGE>   23



                                 SCHEDULE 7.2(b)
                                 ---------------


                                      Liens




<PAGE>   24



                                 SCHEDULE 7.2(c)
                                 ---------------


                                   Investments



<PAGE>   25


                                 SCHEDULE 7.2(d)


                                  Distributions









<PAGE>   1
                                                                    Exhibit 23.1





  Report on Financial Statement Schedule and Consent of Independent Auditors


Our audit also included the financial statement schedule of CytoTherapeutics,
Inc. listed in Item 14(a). This schedule is the responsibility of the Company's
management. Our responsibility is to express an opinion based on our audit. In
our opinion, the financial statement schedule, referred to above, when
considered in relation to the basic financial statements taken as a whole,
presents fairly in all material respects the information set forth therein.

We consent to the incorporation by reference in the Registration Statement
(Form S-8 No. 33-49524) pertaining to the 1988 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 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 6, 1997, except
for Note 17, as to which the date is February 13, 1997, with respect to the
consolidated financial statement schedule included in this Annual Report (Form
10-K) of CytoTherapeutics, Inc. for the year ended December 31, 1996.



                                                        ERNST & YOUNG LLP

Boston, Massachusetts
March 25, 1997






<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                      19,921,584
<SECURITIES>                                22,685,855
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            43,752,211
<PP&E>                                      17,680,503
<DEPRECIATION>                               6,948,401
<TOTAL-ASSETS>                              58,396,743
<CURRENT-LIABILITIES>                        7,267,988
<BONDS>                                      8,222,602
                                0
                                          0
<COMMON>                                       156,144      
<OTHER-SE>                                  34,591,211
<TOTAL-LIABILITY-AND-EQUITY>                58,396,743
<SALES>                                              0
<TOTAL-REVENUES>                             7,104,284
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                            22,809,175
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             618,213
<INCOME-PRETAX>                           (13,759,138)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (13,759,138)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (13,759,138)
<EPS-PRIMARY>                                    (.89)
<EPS-DILUTED>                                    (.89)
        

</TABLE>

<PAGE>   1


                                                                      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
needs 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 rapidly changing, extremely competitive and
involves a high degree of risk, and accura cy with respect to forward-looking
projections is difficult. Cross-references in this Exhibit refer to the sections
of the Company's Annual Report on Form 10-K.

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, regulatory approvals 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 II or 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, may be precluded from development by new
regulations, be adversely affected by government price controls or limitations
on reimbursement, be precluded from commercialization by proprietary rights of
third parties 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; (iv)
safely permit the therapeutic substances produced by the cells within the
membrane to pass through the membrane into the patient in controlled doses for
extended periods; and (v) are sufficiently durable for the intended indication.

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."

There has been increasing regulatory concern about the risks of cell
transplantation. Concern has focused on 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 and 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 include
cells used in the Company's pain program). In addition, the FDA has recently
proposed guidelines which impose significant constraints on the conduct of
clinical trials utilizing xenotransplantation. Furthermore, the FDA has
published a "Proposed Approach to Regulation of Cellular and Tissue-Based
Products" which relates to use of human cells. The Company cannot presently
determine the effects of such actions nor what other actions may be taken.
Restrictions on the testing or use of cells (whether nonhuman or human) as human
therapeutics could materially adversely affect the Company's product development
programs and the Company itself. See "Government Regulation."


<PAGE>   2


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 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 fails to perform its obligations in a timely manner or
terminates its agreement with the Company, the development or commercialization
of the Company's product candidate or research program under such collaborative
agreement may be adversely affected.

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.

EXISTENCE OF THIRD-PARTY PATENTS AND PROPRIETARY RIGHTS; NEED TO OBTAIN LICENSES
- -- There are pending patent applications or issued patents held by others
relating to the Company's proposed products or the technology to be utilized by
the Company in the development of its proposed products. If such patents or
other patents are determined by the Company or a court to be valid and
infringed, the Company may be required to alter its products or processes, pay
licensing fees or royalties or cease certain activities. In particular, the
Company is aware of one issued patent 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. In addition,
each of the neurotrophic factors which the Company is currently investigating
for use in its proposed products is the subject of one or more claims in patents
or patent applications of third parties, and certain other neurotrophic factors
are the subject of third-party patent applications. 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, 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."

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 potenti al 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 which 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.

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 which 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, consistency 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, 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 noncompetitive. See
"Competition."

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. Vacancies have occurred and are likely to occur from time to time
amoung the Company's senior management and scientific staff. Loss of the
services of any of the Company's key employees or consultants or the continued
existence of such vacancies 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 healthcare companies, universities and
research institutions for experienced personnel.

REIMBURSEMENT AND HEALTHCARE 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 healthcare payor
organizations, including government agencies, private healthcare insurers and
other healthcare 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 Healthcare Cost Control."




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