PROTEIN POLYMER TECHNOLOGIES INC
10KSB, 1999-03-05
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  FORM 10-KSB

(Mark One)
[X]  ANNUAL REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
     OF 1934
     For the fiscal year ended December 31, 1998

                                       OR

[_]  TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934
     For the transition period from ____________ to ______________

                         Commission file number 0-19724

                       PROTEIN POLYMER TECHNOLOGIES, INC.
       (Exact name of small business issuer as specified in its charter)

           Delaware                                             33-0311631
 (State or Other Jurisdiction of                              (IRS Employer
 Incorporation or Organization)                             Identification No.)
 
                10655 Sorrento Valley Road, San Diego, CA  92121
                    (Address of Principal Executive Offices)

                   Issuer's Telephone Number:  (619) 558-6064

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

          Securities registered pursuant to Section 12(g) of the Act:
                       Common Stock, Redeemable Warrants
                                (Title of Class)

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

Check if there is no disclosure of delinquent filers pursuant to Item 405 of
Regulation S-B contained herein, and no disclosure will be contained, to the
best of the registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-KSB or any
amendment to this Form 10-KSB.  [__]

The issuer's revenues for the most recent fiscal year were $255,824.

The aggregate market value of the voting stock held by non-affiliates of the
issuer on February 26, 1999 was $5,063,391.

State the number of shares outstanding of each of the issuer's classes of common
equity, as of the latest practicable date:  As of February 26, 1999, 10,915,493
shares of common stock were outstanding.

                      DOCUMENTS INCORPORATED BY REFERENCE:

Definitive Proxy Statement to be filed no later than April 30, 1999 pursuant to
Regulation 14A with respect to the Registrant's 1999 Annual Meeting of
Stockholders (incorporated by reference in Part III).

Transitional Small Business Disclosure Format:  Yes           No   X
                                                   -------      -------

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                       PROTEIN POLYMER TECHNOLOGIES, INC.

                                  FORM 10-KSB
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998

                               TABLE OF CONTENTS


<TABLE>
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                                                                             Page No.
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PART I.....................................................................     2
 
  Item 1.   Business.......................................................     2
 
  Item 2.   Properties.....................................................    15
 
  Item 3.   Legal Proceedings..............................................    15
 
  Item 4.   Submission of Matters to a Vote of Security Holders............    15
 
 
PART II....................................................................    16
 
  Item 5.   Market for Registrant's Common Equity and Related
            Stockholder Matters............................................    16
 
  Item 6.   Management's Discussion and Analysis of Financial Condition and
            Results of Operations..........................................    18
 
  Item 7.   Financial Statements...........................................   F-1
 
  Item 8.   Changes in and Disagreements with Accountants on Accounting and
            Financial Disclosure...........................................    23
 
 
PART III...................................................................    23
 
  Items 9, 10, 11 and 12 - Incorporated by Reference
 
  Item 13.  Financial Statements, Exhibits and Reports on Form 8-K.........    23
 
  Signatures...............................................................    27
</TABLE>

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                                     PART I
                                        
ITEM 1.   BUSINESS

COMPANY BACKGROUND

     Protein Polymer Technologies, Inc., a Delaware corporation ("PPTI" or "the
Company"), is a development-stage biotechnology company incorporated on July 6,
1988 and is engaged in the research, development and production of medical
products based on its proprietary protein-based biomaterials technology.  Since
1992, the Company has primarily focused on developing materials technology and
products to be used in the surgical repair of tissue: surgical adhesives and
sealants; soft tissue augmentation products; wound healing matrices; drug
delivery devices; and surgical adhesion barriers. The Company has also developed
coating technology that can efficiently modify and improve the surface
properties of more traditional biomedical devices.  A common goal is to develop
materials that beneficially interact with human cells, enabling cell growth and
the regeneration of tissues with improved outcomes as compared to current
products and practices.

     In December 1998, the Company filed its first Investigational Device
Exemption ("IDE") with the U.S. Food and Drug Administration ("FDA") to obtain
approval to begin human clinical testing of its urethral bulking agent for the
treatment of female stress urinary incontinence.  The FDA has requested
additional information about the product and the Company is preparing a response
to the request.  The Company intends to submit an additional IDE to the FDA in
1999 to obtain approval to begin human clinical testing of its dermal bulking
agent for use in cosmetic and reconstructive surgery applications. PPTI began
studies to identify its most promising biomaterial formulations for use in these
soft tissue augmentation products in 1996 and has devoted increasing resources
to this program area through 1997 and 1998 in preparation for beginning human
clinical testing.

     Between 1994 and 1997, the Company's efforts were focused predominantly on
the development of its surgical adhesive and sealant technology.  As part of
this effort, the Company targeted the establishment of a strategic alliance with
a market leader in the field of surgical wound closure products which lead to
the execution of comprehensive license, supply and development agreements in
September 1995, with Ethicon, Inc. ("Ethicon"), a subsidiary of the Johnson &
Johnson Company ("J&J"). Ethicon elected to terminate these agreements in
December 1997.

     The Company has demonstrated both the adhesive performance and the
biocompatibility of its product formulations in animal models, including the
resorption of the adhesive matrix in conjunction with the progression of wound
healing.  PPTI is committed to the commercial development of its adhesive and
sealant technology and during 1998 the Company worked to determine the specific
markets and products providing the most significant opportunities for its use.
PPTI is seeking to establish new strategic alliances with leaders in those
markets.
 
     To the extent sufficient resources are available, the Company continues to
research the use of its protein polymers for other tissue repair and medical
device applications, principally for use in tissue engineering matrices and drug
delivery devices.

     Specialty use products currently being marketed by the Company include
SmartPlastic(R) and ProNectin(R) F Cell Attachment Factor. ProNectin F was
launched commercially in 1991. SmartPlastic is ProNectin F Activated Cultureware
where ProNectin F is presented in ready to use form on the surfaces of
disposable plastic labware for culturing human and animal cells. SmartPlastic
was launched commercially in 1995. In 1998 the Company discontinued direct sales
of its cell culture products.

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     Prior to 1992, the Company's scientists had successfully demonstrated the
ability to create and produce novel protein polymer materials having important
physical, biological and chemical properties.  During this period, most of the
Company's efforts were dedicated to supplying E. I. DuPont de Nemours & Co.
("DuPont") with materials under contract for its proprietary research and
testing purposes.

     In 1992, the Company raised approximately $8.9 million through its initial
public offering of common stock and redeemable warrants.  The Company used a
major portion of these proceeds to generate substantive in vitro laboratory
evidence and in vivo animal test data demonstrating the biocompatibility and
performance of its protein polymers and derived biomaterials, and to establish a
materials science group which has developed important materials modification and
fabrication technology.

     In July 1994, the Company raised approximately $2.1 million from the sale
of its unregistered Series C Preferred Stock to private investors.  In September
1995, the Company raised approximately $2.4 million from the sale of its
unregistered Series D Preferred Stock to the same private investors.  Also at
this time these investors exchanged all of their holdings of Series C Preferred
Stock and accumulated dividends into Series D Preferred Stock.  In January 1997,
the Company raised approximately $4.6 million from a private placement of the
Company's common stock with a number of institutional and accredited investors.

     In April and May of 1998, the Company raised approximately $5.4 million
from the sale of 54,437.5 shares of the Company's unregistered Series E
Convertible Preferred Stock ("Series E Stock") priced at $100 per share with
warrants to purchase an aggregate of 3,266,250 shares of common stock to a small
group of institutional and accredited investors. In connection with this
transaction, the Company issued 26,240 shares of Series F Convertible Preferred
Stock in exchange for the same number of shares of outstanding Series D
Convertible Preferred Stock.

     We believe that our current capital resources will be sufficient to fund
our operating losses through April of 1999. In their report for the year ended
December 31, 1998, our independent auditors stated that without additional
financing, there is substantial doubt about our ability to continue as a going
concern. We believe there are a number of alternatives available to meet our
continuing capital requirements. See the Liquidity and Capital Resources section
of Management's Discussion and Analysis of Financial Condition and Results of
Operations for further discussion.

THE COMPANY'S TECHNOLOGY

     PPTI is focused on developing products to improve medical and surgical
outcomes, based on an extensive portfolio of proprietary biomaterials.
Biomaterials are materials that are used to direct, supplement, or replace the
functions of living systems. The interaction between materials and living
systems is dynamic. It involves the response of the living system to the
materials (e.g., biocompatibility) and the response of the materials to the
living system (e.g., degradation). The requirements for performance within this
demanding biological environment have been a critical factor in limiting the
myriad of possible metal, polymer, and ceramic compositions to a relatively
small number that to date have been proven useful in medical devices.

     The goal of biomaterials development historically has been to produce inert
materials -- materials that elicit little or no response from the living system.
However, the Company believes that such conventional biomaterials are
constrained by their inability to convey appropriate messages to the cells which
surround them -- the same messages that are conveyed by proteins in normal human
tissues.

     The products targeted for development by PPTI are based on a new generation
of biomaterials which have been designed to be recognized and accepted by human
cells, to aid in the natural process of bodily repair (including the healing of
tissue and the restoration or augmentation of its form and function), and,
ultimately, to promote the regeneration of tissues. The Company 

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believes that the successful realization of these properties will substantially
expand the role that artificial devices can play in the prevention and treatment
of human disability and disease, and enable the culture of native tissues for
successful reimplantation.

     Through its proprietary core technology, PPTI produces high molecular
weight polymers that can be processed into a variety of material forms such as
gels, sponges, films, and fibers, with their physical strength and rate of
resorption tailored to each potential product application. These polymers are
constructed of the same amino acids as natural proteins found in the body.  The
Company has demonstrated that its polymers can mimic the biological and chemical
functions of natural proteins and peptides, such as the attachment of cells
through specific membrane receptors and the ability to participate in enzymatic
reactions, thus overcoming a critical limitation of conventional biomaterials.
In addition, materials made from PPTI's polymers have demonstrated excellent
biocompatibility in a variety of feasibility studies.

     PPTI's patented core technology enables messages that direct activities of
cells to be precisely formulated and presented in a structured environment
similar to what nature has demonstrated to be essential in creating, maintaining
and restoring the body's functions. The Company's protein polymers are made by
combining the techniques of modern biotechnology and traditional polymer
science. The techniques of biotechnology are used to create synthetic genes
which direct the biological synthesis of protein polymers in recombinant
microorganisms. The methods of traditional polymer science are used to design
novel materials for specific product applications by combining the properties of
individual "building block" components in polymer form.

     In contrast to natural proteins, either isolated from natural sources or
produced using traditional genetic engineering techniques, PPTI's technology
results in the creation of new proteins with unique properties. PPTI has
demonstrated its capability to create materials that:

     . combine properties of different proteins found in nature;
     . reproduce and amplify selected activities of natural proteins;
     . eliminate undesired properties of natural proteins; and
     . incorporate synthetic properties via chemical modifications.

     This capability is fundamental to PPTI's current primary product research
and development focus -- tissue repair and regeneration.  Tissues are highly
organized structures made up of specific cells arranged in relation to an
extracellular matrix ("ECM"), which is principally composed of proteins.  The
behavior of cells is determined largely by their interactions with the ECM.
Thus, the ability to structure the cells' ECM environment allows the protein
messages they receive -- and their activity -- to be controlled.  Similar to
what nature has demonstrated to be essential in creating, maintaining and
restoring the body's functions, PPTI's patented core technology enables messages
that direct activities of cells to be precisely formulated and presented in a
structured environment.

FUNDAMENTAL PROTEIN POLYMERS

     PPTI's primary products under development are based on protein polymers
combining selected properties from two of the most extraordinary structural
proteins found in nature: silk and elastin.  Silk, based upon its crystalline
structure, has long been known as an incredibly strong material, and has a long
history of medical use in humans as a material for sutures.  Elastin fibers are
one of the most remarkable rubber-like materials ever studied. Found in human
tissues such as lungs and arteries, elastin fibers must expand and contract over
a life time, and can be extended nearly three times their resting length without
damaging their flexibility.

     Despite the incredible individual properties of silk and elastin, neither
of these natural protein materials is capable of being processed into forms
other than what nature has provided without destroying their valuable materials
properties. However, PPTI's proprietary technology 

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has enabled the creation of polymers that combine the repeating blocks of amino
acids responsible for the strength of silk and the elasticity of elastin. By
precisely varying the number and sequence of the different blocks in the
assembled protein polymer, new combinations of properties suitable for various
medical applications have been created.

     The Company has also created protein polymers based on repeating blocks of
amino acids found in two other classes of structural proteins found in nature:
collagen and keratin. Collagen is the principal structural component of the
body, found in some shape or form in virtually every tissue, ranging from shock
absorbing cartilage to light transmitting corneas. Keratin is a major component
in hair, nails and skin. The development of materials based on these polymers is
at an early stage of research.

PRODUCT CANDIDATES AND ANTICIPATED MARKETS

     The Company's technology and materials have the potential to create
products and product applications in a variety of medical and specialty use
markets.  The Company's current development efforts are principally focused on
preparations to begin human clinical testing of its hydrogel bulking agents for
soft tissue augmentation, subject to the availability of capital.  However, PPTI
is also conducting product feasibility testing for certain applications of its
tissue adhesive and sealant technology.

     Opportunities for research and development of product candidates for other
medical and specialty uses continue to be evaluated, particularly with respect
to tissue engineering matrices and drug delivery devices.  With the exception of
the use of ProNectin F for in vitro cell culture, all of the Company's product
candidates are subject to preclinical and clinical testing requirements for
obtaining U.S. Food and Drug Administration's ("FDA's") marketing approval.

     The actual development of other product candidates, if any, will depend on
a number of factors, including the availability of funds required to research,
develop, test and obtain necessary regulatory approvals; the anticipated time to
market; the potential revenues and margins that may be generated if a product
candidate is successfully developed and commercialized; and the Company's
assessment of the potential market acceptance of a product candidate.

     Soft Tissue Augmentation

     Conditions where there is a need to augment the body's soft tissues include
both cosmetic and medical applications.  In the former, for example, current
procedures include the injection of collagen-based materials to smooth out
facial wrinkles, acne scars and to modify lip contours. However, these
treatments only last a matter of months, which puts them economically out of
reach for a large portion of the population of people who would otherwise desire
the procedure.

     Medical applications include the treatment of stress urinary incontinence
and gastro-esophageal reflux, the reversible blockage of fallopian tubes for
birth control, the augmentation of vocal chords, and the expansion of gingival
tissues impacted by periodontal disease.  PPTI believes there is a lack of
materials with suitable properties for these applications, primarily because
materials having the required durability in vivo either lack the requisite
biocompatibility or the ability to be easily injected.

     The Company has developed protein polymers that demonstrate excellent
biocompatibility, are soluble in water at room temperature, and are easily
injected into body tissues, irreversibly forming soft, durable gels at body
temperature.  Previously, PPTI has shown gels of similar composition to have
persisted at least 18 months in an animal model.

     PPTI's bulking agents are unique in that they are applied as an aqueous
solution, easily injected through a 30-gauge needle, rapidly spreading
throughout the native tissue architecture. With the increase from room to body
temperature, the polymer solution irreversibly transforms 

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within minutes to a soft, pliable hydrogel. Importantly, the volume of material
remains constant in the liquid to gel transition, such that the tissue expansion
observed by the physician upon administration will be subsequently maintained.

     This is in direct contrast to the majority of competing technologies, which
are suspensions or slurries of solid particles in an aqueous carrier such as
saline. When injected through a fine gauge needle, with some difficulty due to
their thick constitution, the carrier liquid dissipates through the tissues with
time, usually within 24 hours, such that roughly half of the effective bulking
volume is lost. This requires the physician to either overcompensate for the
expected volume reduction upon initial administration, with increased risks to
the patient, or to "top off" the bulking effect with repeated administrations of
the product over time, with substantially increased costs.

     Other hydrogel technologies of which the Company is aware are either
preformed gels, difficult to administer by injection, or polymer solutions mixed
with a chemical cross-linking agent prior to injection. PPTI believes that such
technologies are limited in their overall performance including durability,
biocompatibility and ease of administration.

     In October 1997, in response to PPTI's request for a jurisdiction
determination, the FDA determined that the Company's proposed bulking agent for
the treatment of stress urinary incontinence would be reviewed as a device by
the Center for Devices and Radiologic Health ("CDRH"). Subsequently, the Company
submitted a pre-Investigational Device Exemption ("IDE") filing to the FDA
describing the process used to manufacture the product and a proposed
preclinical testing plan, the results of which would be used to support an IDE
under which the safety and efficacy of the device would be demonstrated in human
clinical trials.

     In December 1998, the Company filed its first IDE with the FDA to obtain
approval to begin human clinical testing of its urethral bulking agent for the
treatment of female stress urinary incontinence.  The FDA has requested
additional information about the product and the Company is preparing a response
to the request.  To the extent funds are available, the Company intends to
submit an additional IDE to the FDA in 1999 to obtain approval to begin human
clinical testing of its dermal bulking agent for use in cosmetic and
reconstructive surgery applications.

     Surgical Adhesives and Sealants

     Surgeons are master craftsmen. However, instead of working with metal, wood
or plastic, they work with living tissues. Like carpenters, they use saws,
chisels (knives) and drills to take things apart and fit pieces together. But
they only have access to string (sutures) and nails (staples, pins, screws) to
hold things in place. Furthermore, a surgeon's work is complicated by the
biological healing response occurring when tissues are injured. This is one of
the reasons why no glue has been approved by the FDA for use inside the human
body.

     As in everyday life, there are many surgical uses for glue where string and
nails just don't work well. They may not be quick or easy enough to use; they
may not be capable of staying in place; they may do more damage than desired;
they and/or the tools to use them may not fit within the available work space;
they may result in fluid or air leaks; or the "fit and finish" or healing
response is just not satisfactory.

     Certain surgical adhesives and sealants that seek to avoid these
limitations have been developed and marketed outside the United States by other
parties. In 1998, the FDA approved two such products for certain uses in the
U.S. DermaBond(TM), a cyanoacrylate adhesive, was approved for topical
application to close skin incisions and  lacerations.  Cyanoacrylate adhesives
set fast and have high strength, but are toxic to certain tissues and form
brittle plastics that do not resorb. These limitations restrict their use to
bonding the outer surfaces of skin together. Tisseel(TM), a fibrin sealant, was
approved for use as an adjunct to hemostasis in surgery.  Fibrin sealants have

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excellent hemostatic properties, but are derived from human and/or animal blood
products, set slowly, have low strength, and lose their strength rapidly.

     A third category of tissue adhesives combines natural proteins such as
collagen or albumin with aldehyde cross-linking agents. Such products are
marketed in Europe for limited life-threatening indications. The aldehyde cross-
linking agents employed (i.e. glutaraldehyde, formaldehyde) in such products are
known to cause adverse tissue reactions.  Additional adhesive and/or sealant
products employing other polymer systems and cross-linking agents are also under
development.

     PPTI is seeking to develop surgical adhesives and sealants that combine the
biocompatibility of fibrin glues (without the risks associated with use of
blood-derived products) with the high strength and fast setting times of
cyanoacrylates. Unique features include significant elasticity within the
adhesive matrix (to move as tissues move) and the capability of tailoring the
resorption rate of the adhesive matrix with the rate at which the wound heals.
A non-resorbable adhesive or sealant can only be used where the damaged tissues
will not heal. Otherwise, a barrier to wound healing is unavoidably created.

     In September 1995, the Company entered into a series of agreements with
Ethicon regarding this program. Ethicon elected to terminate these agreements in
December 1997.    However, the Company has demonstrated both the adhesive
performance and the biocompatibility of its product formulations in animal
models, including the resorption of the adhesive matrix in conjunction with the
progression of wound healing.  During 1998, the Company worked to determine the
specific markets and products providing the most significant opportunities for
the use of its adhesive and sealant technology.

     As a result of its evaluations of the medical market needs, the properties
achievable with its technology, and the capabilities of competitive
technologies, PPTI has focused its product development activities on certain
orthopedic applications, particularly those related to the repair of the spinal
disc for the treatment of chronic low back pain.  Low back pain is the most
common musculoskeletal disorder in industrialized societies. PPTI is committed
to the commercial development of its adhesive and sealant technology and is
seeking to establish new strategic alliances with market leaders.  However,
there can be no assurance that such alliances can be entered into.  The product
candidates the Company is seeking to develop are currently in feasibility
testing prior to beginning formal preclinical studies.

     Wound Healing/Tissue Engineering Matrices

     The current market for wound care products is highly segmented, involving a
variety of different approaches to wound care.  Products currently marketed and
being developed by other parties include fabric dressings (such as gauze),
synthetic materials (such as polyurethane films) and biological materials (such
as growth factors and living tissue skin graft substitutes).  While the type of
product used varies depending on the type of wound and extent of tissue damage,
the Company believes that a principal treatment goal in all instances is to
stimulate wound healing while regenerating functional (as opposed to scar)
tissue.

     The Company has developed protein polymers which it believes may be useful
in the treatment of dermal wounds, particularly chronic wounds such as
decubitous ulcers, where both reconstruction of the ECM and re-establishment of
its function are desired.  These polymers, based on key ECM protein sequence
blocks, are biocompatible, fully resorbable and have been processed into gels,
sponges, films and fibrous sheets.  The Company believes that such materials, if
successfully developed, could improve the wound-healing process by providing
physical support in situ for cell migration and tissue regeneration and as
delivery systems for growth factors. Additionally, such materials may serve as
scaffolds for the ex vivo production of living tissue substitutes.

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     This program is in the early stages of research, which the Company has
principally conducted in collaboration with third parties. Such collaborations
have primarily focused on the treatment of dermal wounds.

     Controlled Release Drug Delivery

     Oral delivery of drugs is the most preferred route of administration.
However, for many drugs this is not possible and alternative drug delivery
routes are required.  Alternative routes include transdermal, mucosal, and by
implantation or injection.  For implantation or injection, it is often desirable
to extend the availability of the drug in order to minimize the frequency of
these invasive procedures.  A few materials have been commercialized which act
as depots for a drug when implanted or injected, releasing the drug over periods
ranging from one month to several years.  Other material and drug combinations
are being developed by third parties.  PPTI believes that the properties of
these materials for such applications can be substantially improved upon, making
available the use of depot systems for a wider range of drugs and applications.

     PPTI's soft tissue augmentation products, its wound healing matrices, and
its medical device coating technology all provide platforms for drug delivery
applications, serving as controlled release drug depots. The protein polymer
materials the Company has developed exhibit exceptional biocompatibility,
provide for control over rates of resorption, and are fabricated using aqueous
solvent systems at ambient temperatures -- attributes which can be critical in
maintaining the activity of the drug, particularly protein-based drugs emerging
from the biotechnology industry. This program is in the early stages of
research.

     Cell Culture Products

     The market for products used to culture mammalian cells encompasses the
production of pharmaceuticals and vaccines, ex vivo cell therapy, and basic and
applied research on the cellular mechanisms of human and animal development and
disease.  The common element is the need to culture cells outside the body in an
artificial, controlled environment.  With the culture of many types of mammalian
cells, fetal bovine serum, animal sera factors or attachment factors must be
added to the culture medium or coated on the culture surface to enable cells to
attach and spread, initiating cell growth.

     Unlike standard tissue culture treated labware, these products primarily
present to cells the RGD cell attachment ligand of the serum protein
fibronectin, an amino acid sequence which is an essential requirement for the
growth, proper morphology and fully-differentiated function of many different
cells.  However, the Company believes that there are disadvantages to using such
products which, depending on the application, result in variable performance,
lack of storage stability, undesirable contaminants, excessive media protein,
high costs and lost time.

     PPTI developed ProNectin F to address these limitations.  This product
presents multiple copies of the RGD ligand within a chemically and thermally
stable protein polymer.  ProNectin F is free of animal-derived contaminants and
has a long shelf-life.  Moreover, tests conducted by third parties and the
Company confirm that, compared with standard tissue culture treated labware,
labware coated with ProNectin F enhances the cell attachment process.

     Since March 1991, the Company has commercially marketed ProNectin F as a
cell culture reagent for use by cell biologists and cell culture laboratories.
In 1995, the Company launched SmartPlastic, where ProNectin F is presented on
the surfaces of disposable plastic labware in ready-to-use form for culturing
human and animal cells.  To date, the Company has generated over $550,000 in
revenues and license fees from the marketing of these products.  In 1998, the
Company discontinued direct sales of its cell culture products.  However, PPTI
maintains its network of distributors to supply the products worldwide.

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Manufacturing, Marketing and Distribution

     ProNectin F

     PPTI currently produces ProNectin F in its laboratory facilities, and
believes its current production facilities are sufficient for the anticipated
demand of ProNectin F in the foreseeable future.  The Company markets and
distributes ProNectin F and SmartPlastic through foreign and domestic
distribution arrangements.

     Biomedical Product Candidates

     Preclinical and clinical testing of potential medical device products,
where the results will be submitted to the FDA, requires compliance with the
FDA's Good Laboratory Practices ("GLP") and other Quality System Regulations
("QSR"). The Company has implemented, and continues to implement, polymer
production and quality control procedures, and has made certain facilities
renovations to operate in conformance with FDA requirements. The Company
believes its current polymer production capacity is sufficient for supplying its
development programs with the required quality and quantity of materials needed
for feasibility and preclinical testing and initial ("pilot") clinical testing.
To expand beyond initial clinical trials, the Company will require additional
manufacturing capacity.

     The Company is considering several methods for increasing production of its
biomedical and other product candidates to meet clinical and commercial
requirements.  For example, the Company may expand its existing facility to
produce needed quantities of materials under FDA's GLP and Good Manufacturing
Practice ("GMP") regulations for clinical and commercial use. Alternatively, the
Company may establish external contract manufacturing arrangements for needed
quantities of materials. However, there can be no assurance that such
arrangements, if desired, could be entered into or maintained on acceptable
terms, if at all, or that the existence or maintenance of such arrangements
would not adversely affect the Company's margins or its ability to comply with
applicable governmental regulations. The actual method, or combination of
methods, that the Company may ultimately pursue will depend on a number of
factors, including availability, cost and the Company's assessment of the
ability of such production methods to meet its commercial objectives.

     The Company currently expects that its initial biomedical products, if any
are commercialized, would be marketed and distributed by a corporate partner.
While this arrangement would minimize the Company's marketing costs and
facilitate wider distribution of any biomedical products it may develop, these
arrangements would possibly reduce the Company's revenues and profits as
compared to what would be possible if the Company directly sold such products.

RESEARCH AND DEVELOPMENT

     Information regarding Company-sponsored research and development activities
and contract research and development revenue is set forth below under the
heading "Management's Discussion and Analysis of Financial Condition and Results
of Operations".

COLLABORATIVE AGREEMENTS

     Because of the highly technical focus of its business, the Company must
conduct extensive research and development prior to any commercial production of
its biomaterials.  During this development stage, PPTI's ability to generate
revenues is limited.  Because of this limitation, the Company does not have
sufficient resources to devote to extensive testing or marketing of its
products.  The Company's primary method of expanding its product development,
testing and marketing capabilities is to seek to form collaborative arrangements
with selected corporate partners with specific resources that the Company
believes complement its business strategies and goals.

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     The medical device industry has traditionally licensed from development
stage companies product candidates whose safety and efficacy has been
demonstrated at least in pilot human clinical trials.  PPTI currently does not
have any product candidates in human clinical testing.  In December 1998, the
Company filed its first IDE with the FDA to obtain approval to begin human
clinical testing of its urethral bulking agent for the treatment of female
stress urinary incontinence.  The FDA has requested additional information about
the product and the Company is preparing a response to the request.  Pending FDA
approval and the availability of sufficient capital, PPTI intends to initiate
human clinical testing of the product in 1999.  The Company also intends to
submit an additional IDE to the FDA in 1999 to obtain approval to begin human
clinical testing of its dermal bulking agent for use in cosmetic and
reconstructive surgery applications.

     Agreements
 
     PPTI is discussing potential collaboration agreements with prospective
marketing partners for both its soft tissue augmentation products and its tissue
adhesive and sealant products. There can be no assurance that the Company will
continue such discussions or be able to establish such agreements at all, or do
so in a timely manner and on reasonable terms, or that such agreements will lead
to successful product development and commercialization.  From time to time, the
Company is a party to certain materials evaluation agreements regarding
biomedical and specialty use applications of its products, polymers and
technology, including applications in areas other than those identified as
product candidates above. These agreements provide, or are intended to provide,
for the evaluation of product feasibility. There can be no assurance that the
Company will continue to be able to establish such agreements at all, or do so
in a timely manner and on reasonable terms, or that such agreements will lead to
joint product development and commercialization agreements.

INTENSE COMPETITION

     The principal anticipated commercial uses of PPTI's biomaterials are as
components of end-use products for biomedical and other specialty applications.
End-use products using or incorporating the Company's biomaterials would compete
with other products which rely on the use of alternative materials.  For
example, bulking agents for soft tissue augmentation are currently marketed
based on bovine collagen and, outside the U.S., the synthetic polymer
polytetrafluoroethylene. Similarly, all targeted applications of the Company's
potential products will compete with other products having the same or similar
applications.

     The areas of business in which the Company engages and proposes to engage
are characterized by intense competition and rapidly evolving technology.
Competition in the biomedical and surgical repair markets is particularly
significant.  The Company's competitors in the biomedical and surgical repair
markets include major pharmaceutical, surgical product, chemical and specialized
biopolymer companies, many of which have financial, technical, research and
development and marketing resources significantly greater than those of the
Company.  Academic institutions and other public and private research
organizations are also conducting research and seeking patent protection, and
may commercialize products on their own or through joint ventures.  Most of the
Company's competitors depend on synthetic polymer technology rather than protein
engineering for developing products.  However, the Company believes that
research into similar protein engineering technology is currently being
conducted by DuPont and several university laboratories.

     The primary elements of competition in the biomedical and surgical repair
products market are performance, cost, safety, reliability, convenience and
commercial production capabilities.  The Company believes that its ability to
compete in this market will be enhanced by its issued patent claims, the breadth
of its other pending patent applications, its early entry into its field and its
experience in protein engineering.

                                       10
<PAGE>
 
PATENTS AND TRADE SECRETS

     PPTI is aggressively pursuing domestic and international patent protection
for its technology, making claim to an extensive range of recombinantly prepared
structural and functional proteins, methods for preparing synthetic repetitive
DNA, methods for the production and purification of protein polymers, end-use
products incorporating such materials and methods for their use.

     The United States Patent and Trademark Office ("USPTO") has issued fourteen
patents to the Company, eight of which were issued in 1998.  U.S. Patent
5,235,041 (1993) relates to the Company's method for purifying structurally
ordered recombinant protein polymers.  U.S. Patent 5,243,038 (1993) covers the
Company's synthetic DNA compositions that encode polymers and copolymers
comprising the amino acid "building blocks" of silk and elastin.  U.S. Patent
5,496,712 (1996) covers the Company's family of high molecular weight collagen
like polymers and the DNA sequences encoding them.  U.S. Patent 5,514,581 (1996)
covers DNA sequences encoding silk-like structural building blocks with an
intervening sequence coding for the key cell attachment ligand from human
fibronectin.  One of the claimed sequences encodes ProNectin F.

     U.S. Patent 5,606,019 (1997) covers the protein compositions comprising
copolymers of the amino acid "building blocks" of silk and elastin. These are
the primary materials used in the Company's current product development efforts.
U.S. Patent 5,641,648 (1997) covers methods by which synthetic genes encoding
protein polymers are created.

     U.S. Patent 5,723,588 (1998) covers molded articles incorporating
biologically active proteins. U.S. Patent 5,760,004 (1998) covers chemical
modification of protein polymers to enhance their water solubility.  U.S. Patent
5,770,697 (1998) broadly covers protein polymers incorporating repetitive amino
acid sequences found in naturally occurring proteins.  U.S. Patent 5,773,249
(1998) expands the coverage of high molecular weight collagen like polymers.
U.S. Patent 5,773,577 (1998) covers protein polymers which can be cross-linked
by certain enzymes that naturally occur in the body. U.S. Patent 5,808,012
(1998) expands the coverage of molded articles to those incorporating chemically
active proteins.  U.S. Patent 5,817,303 (1998) covers the use of protein
polymers with chemical cross-linking agents as adhesives and sealants.  U.S.
Patent 5,830,713 (1998) expands the coverage of methods by which synthetic genes
encoding protein polymers are created.   Additionally, PPTI has eight U.S.
patent applications pending, one of which has been allowed, covering related
aspects of its core technology.

     Although the Company believes its existing issued patent claims may provide
a competitive advantage, there can be no assurance that the scope of the
Company's patent protection is or will be adequate to protect its technology or
that the validity of any patent issued will be upheld in the future.
Additionally, with respect to the Company's allowed and pending applications,
there can be no assurance that any patents will be issued, or that, if issued,
they will provide substantial protection or be of commercial benefit to the
Company.  The two patents issued to PPTI in 1993 will expire in 2010, as will
one of the patents issued in 1996.  The other patent issued in 1996 will expire
in 2013, and the patents issued in 1997 will expire in 2014.  The three patents
issued in 1998 which expand the coverage of previously issued patents will
expire in concert with the original patents.  The other five patents issued in
1998 will expire in 2015.

     Generally, for patent applications filed in the U.S. prior to June 8, 1995,
the term of the patent will be 17 years from the issue date. Subsequently filed
U.S. patent applications will have a term of 20 years from the date of filing,
consistent with the patent laws in international jurisdictions.

     Although the Company does not currently have any operations outside the
U.S., it anticipates that its potential products will be marketed on a worldwide
basis, with possible manufacturing operations outside the U.S. Accordingly,
international patent applications corresponding to the major U.S. patents and
patent applications described above have been filed. 

                                       11
<PAGE>
 
Due to translation costs and patent office fees, international patents are
significantly more expensive to obtain than U.S. patents. Additionally, there
are differences in the requirements concerning novelty and the types of claims
that can be obtained compared to U.S. patent laws, as well as the nature of the
rights conferred by a patent grant. PPTI carefully considers these factors in
consultation with its patent counsel, as well as the size of the potential
markets represented, in determining the foreign countries in which to file
patents.

     In almost all cases, the Company files for patents in Australia, Canada,
Europe and Japan. Currently, PPTI has nine issued foreign patents, 32 pending
foreign applications, and is maintaining its rights to begin prosecution of two
additional applications filed through the Patent Cooperation Treaty/World Patent
Office in all countries of potential economic importance. One of the issued
foreign patents is in Europe and the scope of its claims broadly covers protein
polymers having biological or chemical activity.

     Because of the uncertainty concerning patent protection and the
unavailability of patent protection for certain processes and techniques, PPTI
also relies upon trade secret protection and continuing technological innovation
to maintain its competitive position.  Although all of the Company's employees
have signed confidentiality agreements, there can be no assurance that the
Company's proprietary technology will not be independently developed by other
parties, or that secrecy will not be breached.  Additionally, the Company is
aware that substantial research efforts in protein engineering technology are
taking place at universities, government laboratories and other corporations and
that numerous patent applications have been filed.  The Company cannot predict
whether it may have to obtain licenses to use any technology developed by third
parties or whether such licenses can be obtained on commercially reasonable
terms, if at all.

     In the course of its business, PPTI employs various trademarks and trade
names in packaging and advertising its products.  The Company has obtained
federal registration of its ProNectin(R) trademark and its SmartPlastic(R)
trademark for ProNectin F Activated Cultureware.  The Company intends to protect
and promote all of its trademarks and, where appropriate, will seek federal
registration of its trademarks.

REGULATORY MATTERS

     Regulation by governmental authorities in the United States and other
countries is a significant factor affecting the success of products resulting
from biotechnological research.  The Company's current operations and products
are, and anticipated products and operations will be, subject to substantial
regulation by a variety of agencies, particularly those products and operations
related to biomedical applications.  Currently, the Company's activities are
subject principally to regulation under the Occupational Safety and Health Act
and the Food, Drug and Cosmetic Act.

     Extensive preclinical and clinical testing and pre-market approval from the
FDA is required for new medical devices, drugs or vaccines, which is generally a
costly and time-consuming process.  PPTI is required to be in compliance with
many of the FDA's regulations to conduct testing in support of product
approvals; in particular, compliance with the FDA's Good Laboratory Practices
("GLP") regulations and portions of the FDA's Quality Systems Regulations. Where
PPTI has conducted such testing, the Company may choose to file product approval
submissions itself or maintain with the FDA a "Master File" containing, among
other items, such test results. A Master File can then be accessed by the FDA in
reviewing particular product approval submissions from companies commercializing
products based on PPTI's materials.
 
     There can be no assurance that the Company or its customers will be able to
obtain or maintain the necessary approvals from the FDA or that the Company will
be able to maintain a Master File in accordance with FDA regulations.  In either
case, the Company's anticipated business could be adversely affected.  To the
extent PPTI manufactures medical devices, as opposed to a component material
supplied to a medical device manufacturer, it will be required to conform
commercial manufacturing operations to the FDA's Good Manufacturing Practices

                                       12
<PAGE>
 
("GMP") Quality Systems Regulations. The Company would also be required to
register its facility with the FDA as an establishment involved in the
manufacture of medical devices. GMP regulatory requirements are rigorous, and
there can be no assurance that GMP status could be obtained in a timely manner
and without the expenditure of substantial resources, if at all.
 
     In October 1997, in response to PPTI's request for a jurisdiction
determination, the FDA determined that the Company's proposed bulking agent for
the treatment of stress urinary incontinence would be reviewed as a device by
the CDRH. The FDA's decision to review and regulate PPTI's product as a medical
device is important, since it supports the Company's position that products
based on its polymer technology should be classified for FDA regulation
according to their function in the body rather than the method used to make
their component materials.

     In December 1998, the Company filed its first IDE with the FDA to obtain
approval to begin human clinical testing of its urethral bulking agent for the
treatment of female stress urinary incontinence.  The FDA has requested
additional information about the product and the Company is preparing a response
to the request.  The Company intends to submit an additional IDE to the FDA in
1999 to obtain approval to begin human clinical testing of its dermal bulking
agent for use in cosmetic and reconstructive surgery applications. The Company
has implemented, and continues to implement, polymer production and quality
control procedures, and has made certain facilities renovations to operate in
conformance with FDA requirements.

     The Company's research, development and production activities are, or may
be, subject to various federal and state laws and regulations relating to
environmental quality and the use, discharge, storage, transportation and
disposal of toxic and hazardous substances.  The Company's future activities may
be subject to regulation under the Toxic Substances Control Act, which requires
the Company to obtain pre-manufacturing approval for any new "chemical material"
the Company produces for commercial use that does not fall within the FDA's
regulatory jurisdiction.  The Company believes it is currently in substantial
compliance with all such laws and regulations.  Although the Company intends to
use its best efforts to comply with all environmental laws and regulations in
the future, there can be no assurance that the Company will be able to fully
comply with such laws, or that full compliance will not require substantial
capital expenditures.

PRODUCT LIABILITY AND ABSENCE OF INSURANCE

     PPTI's business may expose it to potential product liability risks whenever
human clinical testing is performed or medical device product sales occur. The
Company believes that its current preclinical testing and production activities
and its sales of ProNectin F and SmartPlastic products do not pose a potential
product liability risk.  The Company therefore currently has no product
liability insurance.  The Company expects to procure such insurance at the time
its product candidates progress to clinical testing and development.  There can
be no assurance however that PPTI will be able to obtain such insurance on
acceptable terms or that such insurance will provide adequate coverage against
potential liabilities.  A successful product liability claim or series of claims
could result in a material adverse effect on the Company.

                                       13
<PAGE>
 
EXECUTIVE OFFICERS OF THE REGISTRANT
 
            Name                Age           Position with the Company
- -----------------------------   ---   -----------------------------------------
J. Thomas Parmeter               59   Chairman of the Board of Directors,
                                      President and Chief Executive Officer
 
Joseph Cappello, Ph.D.           42   Vice President, Research and Development,
                                      Chief Technical Officer and Director,
                                      Polymer Research
 
Philip J. Davis                  68   Corporate Secretary
 
Franco A. Ferrari, Ph.D.         47   Vice President, Laboratory Operations and
                                      Polymer Production and Director,     
                                      Molecular Genetics
 
John E. Flowers                  42   Vice President, Planning and Operations
 
Janis Y. Neves                   47   Director of Finance, Controller, and
                                      Assistant Secretary
 
Erwin R. Stedronsky, Ph.D.       54   Vice President, Product Formulation and
                                      Engineering and Director, Materials
                                      Science

     Mr. Parmeter has been the Company's President, Chief Executive Officer and
Chairman of the Board of Directors since its inception in July 1988 (and, from
July 1988 to July 1992, its Chief Financial Officer). From 1982 to November
1987, Mr. Parmeter was President, Chief Executive Officer and, from June 1987 to
June 1988, Chairman of the Board of Syntro Corporation.

     Dr. Cappello has been the Company's Vice President, Research and
Development since February 1997 and Director, Polymer Research and Chief
Technical Officer since February 1993. From September 1988 to February 1993, he
was the Company's Senior Research Director, Protein Engineering.

     Mr. Davis has been the Company's Secretary since January 1989.  Mr. Davis
has been a director of the Company since April 1995; he previously served as a
director of the Company from January 1989 until October 1991.  Mr. Davis has
been a Senior Vice President with Donaldson, Lufkin & Jenrette since March 1995.
He was Director, Institutional Sales at Merrill Lynch, Inc. (formerly Merrill
Lynch Capital Markets) from February 1991 to March 1995, and was a Vice
President at Merrill Lynch, Inc. from 1986 to 1995.

     Mr. Flowers has been the Company's Vice President, Planning and Operations,
since February 1993.  From September 1988 to February 1993, he was the Company's
Vice President, Commercial Development.

     Dr. Ferrari has been the Company's Vice President, Laboratory Operations
and Director, Molecular Genetics since February 1993.  From September 1988 to
February 1993, he was the Company's Senior Research Director, Genetic
Engineering.

     Ms. Neves has been the Company's Director of Finance since November 1998
and Controller and Assistant Secretary since January 1990.  From July 1988 until
January 1990, Ms. Neves was the Company's Business Office Manager.

     Dr. Stedronsky has been the Company's Vice President, Product Formulation
and Engineering since February 1997 and Director of Materials Science since
September 1992. For 

                                       14
<PAGE>
 
approximately 20 years prior to joining PPTI, Dr. Stedronsky held increasingly
responsible R&D positions in Corporate Research at Monsanto Company.

     All executive officers of the Company were elected by the Board of
Directors and serve at its discretion.  No family relationships exist between
any of the officers or directors of the Company.

EMPLOYEES

     As of February 26, 1999, PPTI had 29 full-time and four part-time
employees, of whom five hold employment contracts with the Company and seven
hold Ph.D. degrees in the chemical or biological sciences.  The Company is
highly dependent on the services of its executive officers and scientists. The
loss of the services of any one of these individuals would have a material
adverse effect on the achievement of the Company's development objectives, its
business opportunities and prospects. The recruitment and retention of
additional qualified management and scientific personnel is also critical to the
Company's success. There can be no assurance that the Company will be able to
attract and retain required personnel on acceptable terms, due to the
competition for such experienced personnel from other biotechnology,
pharmaceutical, medical device and chemical companies, universities and non-
profit research institutions.


ITEM 2.   PROPERTIES

     PPTI does not own any real property.  The Company leases approximately
21,000 square feet in San Diego, California from Sycamore/San Diego Investors.
The leased property includes the Company's administrative offices, which
encompass approximately 4,000 square feet, and its laboratory facilities, which
encompass approximately 17,000 square feet.  The current annual rent is
approximately $425,000.  The lease expires in May 2005.

     The Company believes that its current facilities are adequate to meet its
needs until the end of 1999.  The Company retains an option to lease an
additional 7,000 square feet of office and laboratory space in its present
facility and to extend its lease for an additional five years.


ITEM 3.   LEGAL PROCEEDINGS

     None.


ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     No matter was submitted to a vote of security holders during the fourth
quarter of 1998.

                                       15
<PAGE>
 
                                    PART II


ITEM 5.   MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
          MATTERS.

     The Company's Common Stock trades on The Nasdaq Stock Market under the
symbol "PPTI".  The trade prices set forth below represent inter-dealer prices
without retail markups, markdowns or commissions.
 
                                                 Trade Prices
                                            ----------------------
          1998                                High          Low
          ---------------                   ----------------------
          First Quarter                      $1.531        $1.063
          Second Quarter                      2,250         0.875
          Third Quarter                       1.719         0.750
          Fourth Quarter                      1.250         0.688
          1997
          ---------------
          First Quarter                      $4.625        $1.813
          Second Quarter                      3.063         1.938
          Third Quarter                       3.125         1.563
          Fourth Quarter                      3.250         0.750
 

     As of February 25, 1998, the Company had approximately 110 shareholders of
record; it estimates it has approximately 1,500 beneficial holders.  The Company
has never paid cash dividends on its Common Stock.  The Company currently
intends to retain earnings, if any, for use in the operation and expansion of
its business and therefore does not anticipate paying any cash dividends on the
Common Stock in the foreseeable future.

UNREGISTERED OFFERINGS

     In April and May of 1998, the Company raised approximately $5.4 million
from the sale of 54,437.5 shares of the Company's Series E Convertible Preferred
Stock ("Series E Stock") priced at $100 per share, with warrants to purchase an
aggregate of 3,266,250 shares of common stock to a small group of institutional
and accredited investors.

     Each share of Series E Stock is convertible at any time at the election of
the holder into 80 shares of common stock at a conversion price of $1.25 per
share, subject to certain antidilution adjustments. No underwriters were engaged
by the Company in connection with such issuance and, accordingly, no
underwriting discounts were paid. The offering is exempt from registration under
Section 4(2) of the Securities Act of 1933, as amended (the "Securities Act"),
and met the requirements of Rule 506 of Regulation D promulgated under the
Securities Act.  The Company has registered the shares of common stock
underlying the Series E Stock and the warrants with the Securities and Exchange
Commission. The Company has agreed to use its best efforts to nominate for
election a person selected by the holders of the Series E Stock to its Board of
Directors.

     Each share of Series E Stock received two common stock warrants. One
warrant (first warrant) is exercisable at any time for 40 shares of common stock
at an exercise price of $2.50 per share, and expires approximately 18 months
after the close of the offering; the other warrant (second warrant) is
exercisable at any time for 20 shares of common stock at an exercise price of
$5.00 per share, and expires approximately 36 months after the close of the
offering.  In addition, an 18 month warrant to acquire 200,000 common shares
exercisable at $2.50 per share and a 36 month warrant to acquire 100,000 common
shares exercisable at $5.00 per share were issued as a finder and document
review fee paid to a lead investor. An 18 month warrant to acquire 32,000 common
shares exercisable at $2.50 per share, a 24 month warrant to acquire 16,000
common shares exercisable at $5.00 per share, and 5 year warrants to acquire an
aggregate of 25,200 

                                       16
<PAGE>
 
common shares exercisable at $2.50 per share were issued to certain persons for
service as finders in relation to the private placement.

     In connection with the above private placement, the Company issued 26,420
shares of its Series F Convertible Preferred Stock in exchange for the same
number of shares of outstanding Series D Convertible Preferred Stock. The
Company's Series F Convertible Preferred Stock is equivalent to the Company's
Series E Stock with regard to liquidation preferences.  All other terms of the
Company's Series F Convertible Preferred Stock remained the same as the
Company's Series D Convertible Preferred Stock.

     On January 7, 1997, the Company received $4,760,000, less expenses of
approximately $140,000, from a private placement of 1,904,000 shares of the
Company's common stock, at $2.50 per share, with a number of accredited
investors. No underwriters were engaged by the Company in connection with such
issuance and, accordingly, no underwriting discounts or commissions were paid.
The issuance was exempt from registration under Section 4(2) of the Securities
Act of 1933, as amended (the "Securities Act"), and met the requirements of Rule
506 of Regulation D promulgated under the Securities Act. The Company agreed to
register the shares with the Securities and Exchange Commission promptly after
the closing. The registration was declared effective on January 24, 1997.

     On September 14, 1995, the Company issued 49,187 shares of its Series D
Convertible Preferred Stock and warrants to purchase 500,960 shares of common
stock at $1.25 per share in a private placement to certain accredited investors.
Of this amount, 20,000 shares of Series D Convertible Preferred Stock and
warrants to purchase 400,000 shares of common stock were issued for cash at
$100.00 per share; 21,600 shares of Series D Convertible Preferred Stock were
issued in exchange for all outstanding shares of the Company's Series C
Convertible Preferred Stock and 2,539 shares for accrued and unpaid dividends
thereon; and an additional 5,048 shares of Series D Convertible Preferred Stock
and warrants to purchase 100,960 shares of common stock were issued in exchange
for cancellation of a $500,000 bridge loan and accrued interest thereon.  No
underwriters were engaged by the Company in connection with such issuance and,
accordingly, no underwriting discounts or commissions were paid. The issuance
was exempt from registration under Section 4(2) of the Securities Act and met
the requirements of Rule 506 of Regulation D promulgated under the Securities
Act.

     Each share of Series D and Series F Convertible Preferred Stock earns a
cumulative dividend at the annual rate of $10 per share, payable as and when
declared by the Company's Board of Directors in the form of cash, common stock
or any combination thereof. The Series D and F Convertible Preferred Stock is
convertible into common stock after two years from the date of issuance at the
holder's option. The conversion price at the time of conversion is the lesser of
$3.75 or the market price. The Series D and F Convertible Preferred Stock is
redeemable at the Company's option after four years from the date of issuance.
Automatic conversion of all of the Series D and F Convertible Preferred Stock
will occur if: (a) the Company completes a public offering of common stock at a
price of $2.50 or higher; or (b) the holders of a majority thereof elect to
convert. The Company has the option to demand conversion of the Series D and F
Convertible Preferred Stock if the average market price of its common stock
equals or exceeds $5.00 per share over a period of twenty business days. The
Series D Convertible Preferred Stock has a liquidation preference of $100 per
share plus accumulated dividends.

     At the time of purchase, the Series D Convertible Preferred stockholders
received warrants to purchase, at an exercise price of $1.25 per share, twenty
shares of the Company's common stock for each share of Series D Convertible
Preferred Stock acquired for cash, or upon conversion of the outstanding bridge
loan and accrued interest thereon, described above. Warrants to acquire a total
of 500,960 shares of common stock were issued. All of these warrants were
exercised during 1996, from which the Company received aggregate gross proceeds
of $626,200.  The Series D Convertible Preferred stockholders were granted
certain registration rights relating to their shares 

                                       17
<PAGE>
 
of common stock issuable upon conversion of the Series D Convertible Preferred
Stock and upon the exercise of their warrants.

     In July 1994, the Company received $2,160,000 from a private placement of
the Company's Series C Convertible Preferred Stock with certain accredited
investors, consisting of 21,600 shares at $100.00 per share. No underwriters
were engaged by the Company in connection with such issuance and, accordingly,
no underwriter discounts or commissions were paid. The issuance was exempt from
registration under Section 4(2) of the Securities Act and met the requirements
under Rule 506 of Regulation D promulgated under the Securities Act. As
described above, the investors exchanged 21,600 shares of Series C Convertible
Preferred Stock, plus accrued and unpaid dividends thereon, for 24,139 shares of
Series D Convertible Preferred Stock. There are currently no shares of Series C
Convertible Preferred Stock outstanding.

     In connection with the issuance of the Series C Convertible Preferred
Stock, warrants were also issued to acquire a total of 432,000 shares of the
Company's common stock at a price of $1.25 per share. All of these warrants were
exercised during 1996, from which the Company received aggregate gross proceeds
of $540,000.

     In July 1996, holders of warrants to acquire 322,663 shares of common stock
(all of whom were accredited investors) exercised such warrants at $2.50 per
share, resulting in approximately $807,000 in gross proceeds to the Company.
These warrants were originally issued in 1991 in connection with the issuance of
the Company's Series B Convertible Preferred Stock. The issuance upon exercise
of these warrants was exempt from registration under Section 4(2) of the
Securities Act and met the requirements under Rule 506 of Regulation D
promulgated under the Securities Act. The Company agreed to register the resale
of the common stock received upon exercise of these warrants, and the applicable
registration was declared effective on July 19, 1996.


ITEM 6.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

FORWARD LOOKING STATEMENTS

     Certain statements contained or incorporated by reference in this Annual
Report on Form 10-KSB constitute "forward-looking statements" within the meaning
of the Private Securities Litigation Reform Act of 1995. Such forward-looking
statements involve known and unknown risks, uncertainties and other factors
which may cause actual results, performance or achievements of the company, or
industry results, to be materially different from any future results,
performance or achievements expressed or implied by forward-looking statements.
Such risks and uncertainties include, among others, history of operating losses,
raising adequate capital for continuing operations, early stage of product
development, compliance with NASDAQ listing requirements, scientific and
technical uncertainties, competitive products and approaches, reliance upon
collaborative partnership agreements and funding, regulatory testing and
approvals, patent protection uncertainties and manufacturing scale-up and
required qualifications. While these statements represent management's current
judgment and expectations for the company, such risks and uncertainties could
cause actual results to differ materially from any future results suggested
herein. The company undertakes no obligation to release publicly the results of
any revisions to these forward-looking statements to reflect events or
circumstances arising after the date hereof.

GENERAL OVERVIEW

     Incorporated in 1988, Protein Polymer Technologies, Inc. has concentrated
its research and development efforts on establishing a scientific and technical
leadership position in the production of unique protein-based materials.  The
Company has identified biomedical market and product opportunities for further
research and development that management believes will exploit the 

                                       18
<PAGE>
 
unique properties of the Company's technology to competitive advantage. The
Company has been unprofitable to date, and as of December 31, 1998 has an
accumulated deficit of $32,987,964.

     The Company's product candidates for surgical repair, augmentation and
regeneration of human tissues are in various stages of research and development.
Its more advanced programs are in the areas of bulking agents for soft tissue
augmentation, particularly for use in urethral tissue for the treatment of
female stress incontinence and in dermal tissue for cosmetic and reconstructive
procedures. The Company currently is devoting the majority of its resources to
the development and registration of these products which are projected, pending
approval by the U.S. Food and Drug Administration, to begin human clinical
trials later this year, subject to the availability of sufficient capital. The
Company's other advanced product technology is in the area of tissue adhesives
and sealants. Currently the Company's research and development in this area is
focused on the repair of spinal discs for the treatment of lower back pain. The
Company's first commercial products, ProNectin F and SmartPlastic, are used by
biologists and cell culture laboratories, principally to grow mammalian cells
for biomedical research purposes.

     In 1995, the Company entered into a collaborative relationship with Ethicon
regarding its surgical adhesives and sealants program.  Ethicon terminated the
relationship in December 1997 which materially adversely affected the Company.
The Company's strategy with most of its programs is to enter into collaborative
development agreements with major medical product marketing and distribution
companies.  Although these relationships, to the extent any are consummated, may
provide significant near-term revenues through up-front licensing fees, research
and development reimbursements and milestone payments, the Company expects to
continue incurring operating losses for the next several years.

     The Company's cash balance as of December 31, 1998 was $1,380,000, which
the Company believes is sufficient to fund its operations through April 1999.
The Company is attempting to raise additional funds for continuing operations
through private or public offerings and collaborative agreements (see "Liquidity
and Capital Resources" below, and Note 1 of the Audited Financial Statements for
additional information and a description of the associated risks).

RESULTS OF OPERATIONS

     Contract research revenue for the year ended December 31, 1998 was $50,000,
compared to $460,000 and $610,000 for 1997 and 1996, respectively.  During 1997
and 1996 the Company received research and development reimbursements totaling
$300,000 and $600,000, respectively, from Ethicon related to the Company's
surgical adhesives and sealants program.  In September 1995, the Company
received a payment of $800,000 from Ethicon upon the signing of the various
agreements related to the Company's tissue adhesives and sealants program.
Other revenues for these periods were derived from materials evaluation
agreements entered into with various divisions of J&J.  In December 1997,
Ethicon elected to terminate its collaboration with the Company; therefore, no
additional revenue has been generated from these agreements.

     Interest income was $135,000 for the year ended December 31, 1998, as
compared to $187,000 for 1997 and $87,000 for 1996.  The year-to-year
variability resulted from the amount and timing of the receipt of equity capital
and the amounts of excess cash available for investment.

     Product sales for the years ended December 31, 1998 were $67,000, compared
to $77,000 and $58,000 in 1997 and 1996 respectively.  Product sales consist of
ProNectin F related product revenues and licensing fees. Sales during 1996
reflected disappointing market interest in the line of ProNectin products; as a
result the Company discontinued related promotional expenditures to conserve
cash.  Sales in 1997 and 1998 primarily reflect distributor stocking orders.

     Cost of sales was $4,000 for the year ended December 31, 1998, versus
$26,000 and $47,000 for 1997 and 1996, respectively. Because the products sold
through distributors are manufactured to order, the Company no longer books
inventory reserves. Royalty expenses of 

                                       19
<PAGE>
 
$25,000 were paid to Telios Pharmaceuticals, Inc. for each of the three years
ended December 31, 1998, 1997 and 1996. Additionally, prior to 1997, royalty
expenses of $10,000 per year were paid to Stanford University.

     Research and development expenses for the year ended December 31, 1998 were
$4,138,000, compared to $3,127,000 in 1997, an increase of 32%. This increase is
due primarily to expanded activities regarding the Company's soft tissue
augmentation program, in particular the outside testing and regulatory
consulting expenses associated with the filing of an Investigational Device
Exemption with the U.S. Food and Drug Administration to begin human trials for
the treatment of female stress urinary incontinence. Other related expenses
include expanded manufacturing capacity and manufacturing process validation,
quality assurance efforts, and outside testing services. The Company expects its
research and development expenses will increase in the future, to the extent
additional capital is obtained, due to the expansion of product-directed
development efforts including human clinical testing, increased manufacturing
requirements, and increased use of outside testing services.

     Selling, general and administrative expenses for the year ended December
31, 1998 were $1,727,000, as compared to $1,988,000 for 1997, a decrease of 13%.
This decrease was due to reduced patent filing expenses. To the extent possible,
the Company concentrated on controlling costs reflected in reduced travel,
office supplies, and non-regulatory consulting costs. The Company expects its
selling, general and administrative expenses will increase in the future, to the
extent additional capital is obtained, consistent with supporting its research
and development efforts and as business development, patent, legal and investor
relations activities require.

     For the year ended December 31, 1998, the Company recorded a net loss
applicable to common shareholders of $9,183,000, or $.88 per share, as compared
to $4,887,000, or $.52 per share for 1997, and $3,356,000, or $.51 per share for
1996. The difference between 1998 and previous year end results is due primarily
to a non-cash "imputed dividend" expense of $3,266,000 that resulted from the
sale and issuance of the Company's Series E Convertible Preferred Stock during
1998. The 1998, 1997 and 1996 losses and per share calculations also include
$278,000, $433,000 and $492,000, respectively, of undeclared and/or paid
dividends from the Company's Preferred Stock.

     The Company expects to incur increasing operating losses for the next
several years, to the extent additional capital is obtained, based upon the
successful continuation of the tissue augmentation program and product
registration, and the tissue adhesives program, as well as expected increases in
the Company's other research and development, manufacturing and business
development activities.  The Company's results depend in part on its ability to
establish strategic alliances and generate contract revenues, increased
research, development and manufacturing efforts, preclinical and clinical
product testing and commercialization expenditures, expenses incurred for
regulatory compliance and patent prosecution, and other factors.  The Company's
results will also fluctuate from period to period due to timing differences.

     To date, the Company believes that inflation and changing prices have not
had a material impact on its continuing operations. Based upon Company earnings
history, a valuation allowance of $11,749,000 is required to reduce the
Company's net deferred tax assets to the amount realizable.

                                       20
<PAGE>
 
LIQUIDITY AND CAPITAL RESOURCES

     As of December 31, 1998, the Company had cash, cash equivalents and short-
term investments totaling $1,380,000, as compared to $1,300,000 at December 31,
1997.  As of December 31, 1998, the Company had working capital of $600,000,
compared to $697,000 at December 31, 1997.  In April and May of 1998, the
Company realized approximately $5,400,000 net of expenses from the private
placement of the Company's Series E Convertible Preferred Stock.

     The Company had long-term capital lease obligations of $106,000 as of
December 31, 1998, compared to an obligation of $190,000 as of December 31,
1997.  For the year ended December 31, 1998, the Company's cash expenditures for
capital equipment and leasehold improvements totaled $197,000, compared with
$296,000 for the same period last year.  The Company anticipates that these
expenditures will be less in 1999 as laboratory renovations and additional
equipment required to meet current GLP regulations and production requirements
have been mostly completed. However, the Company anticipates a significant
increase in manufacturing-related equipment and leasehold improvement
expenditures in 2000 due to an increase in need for products for clinical
testing, and anticipated need for additional product manufacturing for
preclinical animal studies. The Company may enter into additional capital
equipment lease arrangements in the future if available at appropriate rates and
terms.

     The Company believes its existing available cash, cash equivalents and
short-term investments would be sufficient to meet its anticipated capital
requirements through April 1999.  Substantial additional capital resources will
be required to fund continuing expenditures related to the Company's research,
development, manufacturing and business development activities. The Company
believes there may be a number of alternatives available to meet the continuing
capital requirements of its operations, such as collaborative agreements and
public or private financings. During 1999, the Company expects that the possible
exercise of existing warrants could result in additional funds for continuing
operations.  Further, the Company is currently in preliminary discussions with a
number of potential collaborative partners and, based on the results of various
materials evaluations, revenues in the form of license fees, milestone payments
or research and development reimbursements could be generated.  There can be no
assurance that any of these fundings will be consummated in the necessary
timeframes needed for continuing operations or on terms favorable to the
Company.  If adequate funds are not available, the Company will be required to
significantly curtail its operating plans and may have to sell or license out
significant portions of the Company's technology or potential products.

YEAR 2000 COMPLIANCE

     The Company has developed a plan to modify its information technology in
recognition of the year 2000 issue. The "Year 2000" issue concerns potential
exposure related to the interruption of business practice and financial
misinformation resulting from the application of computer programs which have
been written using two digits, rather than four, to define the applicable year
of business transactions. The Company has undertaken initiatives to ensure that
its computer systems are Year 2000 compliant. To date, the Company has not
incurred any material costs in connection with its Year 2000 plan. Based on its
assessments to date, the Company does not expect to incur any further
significant costs, or anticipate any significant problems or uncertainties
associated with becoming Year 2000 compliant.

                                       21
<PAGE>
 
     The following is a breakdown by phase of the progress the Company has made
to date on its Year 2000 plan:

          Phase                                      Timeframe   % Complete
          --------------------------------------     ---------   -----------
          Initial identification and assessment      Q-4 1998        95%
          Remediation                                Q-4 1998        95%
          Testing                                    Q-2 1999        70%
          Contingency planning                       Q-2 1999        50%


     The Company is reliant on its vendors and suppliers and may be reliant on
strategic partners to provide Year 2000 compliant systems prior to December 31,
1999. The Company is in the process of surveying all of its major vendors and
suppliers to determine whether their systems are Year 2000 compliant. At this
time, the impact on the Company of significant vendors and suppliers not being
in full compliance cannot be reasonably estimated. However, the Company believes
that any of its vendors and suppliers can be replaced with minimal cost impact.
The Company is developing a plan to mitigate the impact of vendors and suppliers
who are not in compliance with issues related to the Year 2000.

                                       22
<PAGE>
 
ITEM 7.   FINANCIAL STATEMENTS

     Filed herewith are the following Audited Financial Statements for Protein
Polymer Technologies, Inc. (a Development Stage Company):
<TABLE>
<CAPTION>
 
 
    Description                                                                     Page
    -----------------------------------------------------------------------------   ----
    <S>                                                                             <C>

    Report of Ernst & Young LLP, Independent Auditors...........................    F-2

    Balance Sheets at December 31, 1998 and 1997................................    F-3

    Statements of Operations for the years ended December 31, 1998, 1997
       and 1996 and the period July 6, 1988 (inception) to December 31, 1998....    F-4

    Statements of Stockholders Equity for the period July 6, 1988 (inception)
       to December 31, 1998.....................................................    F-5

    Statements of Cash Flows for the years ended December 31, 1998, 1997
       and 1996 and the period July 6, 1988 (inception) to December 31, 1998....    F-7

    Notes to Financial Statements...............................................    F-9
</TABLE>

                                      F-1
<PAGE>
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


The Board of Directors and Stockholders
Protein Polymer Technologies, Inc.


     We have audited the accompanying balance sheets of Protein Polymer
Technologies, Inc. (a Development Stage Company) as of December 31, 1998 and
1997, and the related statements of operations, stockholders' equity and cash
flows for each of the three years in the period ended December 31, 1998 and for
the period July 6, 1988 (inception) to December 31, 1998.  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 financial statements referred to above present fairly,
in all material respects, the financial position of Protein Polymer
Technologies, Inc. (a Development Stage Company) at December 31, 1998 and 1997,
and the results of its operations and its cash flows for each of the three years
in the period ended December 31, 1998 and for the period July 6, 1988
(inception) to December 31, 1998 in conformity with generally accepted
accounting principles.

     As discussed in Note 1 to the financial statements, Protein Polymer
Technologies, Inc. (a Development Stage Company) has reported accumulated losses
during the development stage aggregating $(32,987,964) and without additional
financing, lacks sufficient working capital to fund operations beyond April
1999, which raises substantial doubt about its ability to continue as a going
concern.  Management's plans as to these matters are described in Note 1.  The
1998 financial statements do not include any adjustments to reflect the possible
future effects on the recoverability and classification of assets or the amounts
and classification of liabilities that may result from the outcome of this
uncertainty.


                                       ERNST & YOUNG LLP

San Diego, California
February 5, 1999

                                      F-2
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                                BALANCE SHEETS
<TABLE>
<CAPTION>
 
                                                                                   DECEMBER 31,
                                                                             1998                1997
                                                                       --------------------------------
<S>                                                                    <C>                 <C>
ASSETS                                                                 
Current assets:                                                        
 Cash and cash equivalents                                             $  1,383,148        $    325,021
 Short-term investments                                                           -             974,817
 Other current assets                                                        66,459              88,868
                                                                       ------------        ------------
Total current assets                                                      1,449,607           1,388,706
                                                                       
 Deposits                                                                    36,177              36,617
 Notes receivable from officers                                             141,000             153,000
                                                                       
 Equipment and leasehold improvements, net                                  598,447             769,564
                                                                       
                                                                       ------------        ------------
                                                                       $  2,225,231        $  2,347,887
                                                                       ============        ============
                                                                       
LIABILITIES AND STOCKHOLDERS' EQUITY                                   
Current liabilities:                                                   
 Accounts payable                                                      $    515,413        $    423,594
 Accrued employee benefits                                                  167,849             151,831
 Other accrued expenses                                                      21,574              41,151
 Deferred revenue                                                                 -                   -
 Current portion capital lease obligations                                   84,518              75,110
 Deferred rent                                                               60,668                   -
                                                                       ------------        ------------
Total current liabilities                                                   850,022             691,686
                                                                       
Long-term portion capital lease obligations                                 105,548             190,068
                                                                       
Stockholders' equity:                                                  
  Convertible Preferred Stock, $.01 par value, 153,917 shares          
   authorized, 79,202 and 28,214 shares issued and outstanding at      
   December 31, 1998 and 1997, respectively - liquidation              
   preference of $7,920,200                                               7,600,226           2,667,403
  Common stock, $.01 par value, 25,000,000 shares authorized,   
   10,827,240 and 10,420,722 shares issued and outstanding at           
   December 31, 1998 and 1997, respectively                                 108,274             104,208
  Additional paid-in capital                                             26,549,125          22,778,033
  Deficit accumulated during development stage                          (32,987,964)        (24,083,511)
                                                                       ------------        ------------
Total stockholders' equity                                                1,269,661           1,466,133
                                                                       ------------        ------------
                                                                       
                                                                       $  2,225,231        $  2,347,887
                                                                       ============        ============
</TABLE>

See accompanying notes.

                                      F-3

<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                           STATEMENTS OF OPERATIONS 
<TABLE>
<CAPTION>
                                                                                                      FOR THE PERIOD
                                                                                                       JULY 6, 1988
                                                                                                      (INCEPTION) TO
                                                          YEARS ENDED DECEMBER 31,                      DECEMBER 31,
                                                1998                1997                1996               1998
                                           -------------------------------------------------------------------------
<S>                                        <C>                 <C>                 <C>                 <C>
Revenues:
   Contract revenue                         $    50,000         $   459,510         $   610,000        $  4,354,965
   Interest income, net                         134,978             186,531              87,317           1,080,929
   Product and other income                      70,846              76,917              58,434             630,014
                                            -----------         -----------         -----------        ------------ 
Total revenues                                  255,824             722,958             755,751           6,065,908
 
Expenses:
   Cost of sales                                  4,158              26,141              47,364             279,679
   Research and development                   4,137,986           3,127,257           2,021,413          21,385,254
   Selling, general and administrative        1,726,883           1,988,493           1,516,406          13,156,302
   Royalties                                     25,000              35,000              35,000             290,171
                                            -----------         -----------         -----------        ------------ 
Total expenses                                5,894,027           5,176,891           3,620,183          35,111,406
                                            -----------         -----------         -----------        ------------ 

Net loss                                     (5,638,203)         (4,453,933)         (2,864,432)        (29,045,498)
 
Undeclared and/or paid dividends on
 preferred stock                              3,544,323             432,682             491,867           4,962,015
                                            -----------         -----------         -----------        ------------
 
Net loss applicable to common
 shareholders                               $(9,182,526)        $(4,886,615)        $(3,356,299)       $(34,007,513)
                                            ===========         ===========         ===========        ============
 
Net loss per common share - basic
 and diluted                                $      (.88)        $      (.52)        $      (.51)
                                            ===========         ===========         ===========        
Shares used in computing net loss
 per common share - basic and
 diluted                                     10,484,277           9,487,165           6,638,814
                                            ===========         ===========         ===========    
</TABLE>
See accompanying notes.

                                      F-4
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                      STATEMENTS OF STOCKHOLDERS' EQUITY

         FOR THE PERIOD JULY 6, 1988 (INCEPTION) TO DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                                                  COMMON STOCK           PREFERRED STOCK    
                                                                         --------------------------------------------------
                                                                              Shares        AMOUNT      SHARES      AMOUNT  
                                                                         --------------------------------------------------
<S>                                                                      <C>               <C>          <C>       <C>        
 Issuance of common stock at $.01 per share for cash                           400,000     $  4,000          -    $       -  
 Issuance of common stock at $.62 per share for cash and receivables         1,116,245       11,162          -            -  
 Receivables from sale of common stock                                               -            -          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1988                                                 1,516,245       15,162          -            -  
 Repayment of receivables from sale of common stock                                  -            -          -            -  
 Issuance of common stock at $.62 per share                                    359,136        3,594          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1989                                                 1,875,381       18,756          -            -  
 Exercise of common stock options at $.01 per share for cash                    60,000          600          -            -  
 Issuance of common stock at $.68 per share for cash and compensation            5,000           50          -            -  
 Common stock repurchased at $.01 per share for cash                           (25,000)        (250)         -            -  
 Common stock issued at $.68 per share for cash and compensation                25,000          250          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1990                                                 1,940,381       19,406          -            -  
 Exercise of common stock options at $.68 per share for cash                     5,000           50          -            -  
 Exercise of warrants for common stock                                         483,755        4,837          -            -  
 Conversion of notes payable to common stock                                   339,230        3,391          -            -  
 Conversion of notes payable to preferred stock                                      -            -    278,326        2,783
 Issuance of preferred stock at $2.00 per share for cash, net of                                  -          -            - 
   issuance costs                                                                    -            -    400,000      400,000
 Issuance of warrants for cash                                                       -            -          -            -  
 Issuance of warrants in connection with convertible notes payable                   -            -          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1991                                                 2,768,366       27,684    678,326        6,783
 Initial public offering at $6.50 per unit, net of issuance costs            1,667,500       16,676          -            -  
 Conversion of Series B preferred stock into common stock in                                                                 
  connection with initial public offering                                      678,326        6,783   (678,326)      (6,783)
 Conversion of Series A preferred stock into common stock at                                                                 
   1.13342 per share                                                           713,733        7,137          -            -   
 Net loss                                                                            -            -          -            - 
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1992                                                 5,827,925       58,280          -            -   
 Exercise of common stock options at $.68 per share                              3,000           30          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1993                                                 5,830,925       58,310          -            -  
 Issuance of preferred stock at $100 per share for cash, net                                                                 
   of issuance costs                                                                 -            -     21,600    2,073,925
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1994                                                 5,830,925       58,310     21,600    2,073,925
 Issuance of preferred stock at $100 per share for cash and                                                                  
  cancellation of bridge loan, net of issuance costs                                 -            -     25,000    2,432,150
 Series C dividends paid in Series D preferred stock                                 -            -      2,539      253,875
 Interest paid in Series D preferred stock                                           -            -         48        4,795
 Exercise of common stock options at $.53 per share                              2,000           20          -            -  
 Net loss                                                                            -            -          -            -  
                                                                         -------------     --------     ------    ---------
Balance at December 31, 1995                                                 5,832,925       58,330     49,187    4,764,745
</TABLE>

<TABLE>
<CAPTION>
                                                                                           DEFICIT
                                                                                         ACCUMULATED
                                                                                           DURING         RECEIVABLES FROM
                                                                         ADDITIONAL      DEVELOPMENT     TOTAL STOCKHOLDERS'
                                                                        PAID-IN CAPITAL     STAGE       STOCK         EQUITY
                                                                        --------------------------------------------------------
<S>                                                                     <C>             <C>            <C>          <C>
 Issuance of common stock at $.01 per share for cash                    $         -     $         -    $       -    $     4,000
 Issuance of common stock at $.62 per share for cash and
  receivables                                                               681,838               -            -        693,000
 Receivables from sale of common stock                                            -               -      (86,000)       (86,000)
 Net loss                                                                         -        (322,702)           -       (322,702)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1988                                                681,838        (322,702)     (86,000)       288,298
 Repayment of receivables from sale of common stock                               -               -       86,000         86,000
 Issuance of common stock at $.62 per share                                 219,358               -            -        222,952
 Net loss                                                                         -        (925,080)           -       (925,080)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1989                                                901,196      (1,247,782)           -       (327,830)
 Exercise of common stock options at $.01 per share for cash                      -               -            -            600
 Issuance of common stock at $.68 per share for cash and compensation         3,350               -            -          3,400
 Common stock repurchased at $.01 per share for cash                              -               -            -           (250)
 Common stock issued at $.68 per share for cash and compensation             16,750               -            -         17,000
 Net loss                                                                         -      (1,501,171)           -     (1,501,171)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1990                                                921,296      (2,748,953)           -     (1,808,251)
 Exercise of common stock options at $.68 per share for cash                  3,350               -            -          3,400
 Exercise of warrants for common stock                                      295,493               -            -        300,330
 Conversion of notes payable to common stock                                508,414               -            -        511,805
 Conversion of notes payable to preferred stock                             553,869               -            -        556,652
 Issuance of preferred stock at $2.00 per share for cash, net of
   issuance costs                                                           703,475               -            -        707,475
 Issuance of warrants for cash                                                3,000               -            -          3,000
 Issuance of warrants in connection with convertible notes payable           28,000               -            -         28,000
 Net loss                                                                         -      (1,143,119)           -     (1,143,119)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1991                                              3,016,897      (3,892,072)           -       (840,708)
 Initial public offering at $6.50 per unit, net of issuance costs         8,911,024               -            -      8,927,700
 Conversion of Series B preferred stock into common stock in
  connection with initial public offering                                         -               -            -              -
 Conversion of Series A preferred stock into common stock at
  1.13342 per share                                                       1,717,065               -            -      1,724,202
 Net loss                                                                         -      (3,481,659)           -     (3,481,659)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1992                                             13,644,986      (7,373,731)           -      6,329,535
 Exercise of common stock options at $.68 per share                           2,010               -            -          2,040
 Net loss                                                                         -      (3,245,436)           -     (3,245,436)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1993                                             13,646,996     (10,619,167)           -      3,086,139
 Issuance of preferred stock at $100 per share for cash, net of
   issuance costs                                                                 -               -            -      2,073,925
 Net loss                                                                         -      (3,245,359)           -     (3,245,359)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1994                                             13,646,996     (13,864,526)           -      1,914,705
 Issuance of preferred stock at $100 per share for cash and
  cancellation of bridge loan,  net of issuance costs                             -               -            -      2,432,150
 Series C dividends paid in Series D preferred stock                              -        (253,875)           -              -
 Interest paid in Series D preferred stock                                        -               -            -          4,795
 Exercise of common stock options at $.53 per share                           1,040               -            -          1,060
 Net loss                                                                         -      (2,224,404)           -     (2,224,404)
                                                                        -----------     -----------    ---------    -----------
Balance at December 31, 1995                                             13,648,036      16,342,805)           -      2,128,306
</TABLE>


                            See accompanying notes.

                                      F-5
<PAGE>
 
<TABLE>
<CAPTION>
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                      STATEMENTS OF STOCKHOLDERS' EQUITY

         FOR THE PERIOD JULY 6, 1988 (INCEPTION) TO DECEMBER 31, 1998

                                                                                 COMMON STOCK            PREFERRED STOCK
                                                                           -------------------------------------------------- 
                                                                             SHARES        AMOUNT      SHARES       AMOUNT   
                                                                           --------------------------------------------------
<S>                                                                        <C>           <C>          <C>        <C>         
 Exercise of common stock warrants at $1.25 per share                         932,960     $  9,330          -    $         -  
 Exercise of common stock warrants at $2.50 per share, net of                
   issuance costs                                                             322,663        3,226          -              - 
 Exercise of common stock warrants at $1.00 per share                          25,000          250          -              - 
 Exercise of common stock options                                             136,000        1,360          -              - 
 Stock repurchases                                                            (16,320)        (163)         -              - 
 Net loss                                                                           -            -          -              - 
                                                                           ----------     --------    -------    -----------
Balance at December 31, 1996                                                7,233,228       72,333     49,187      4,764,745 
 Issuance of common stock at $2.50 per share, net of issuance costs         1,904,000       19,040          -              - 
 Exercise of common stock options                                              28,000          280          -              - 
 Issuance of common stock under stock purchase plan                            15,036          151          -              - 
 Conversion of Series D preferred stock into common stock                   1,032,537       10,325    (20,973)    (2,097,342)
 Series D dividends paid in common stock                                      207,921        2,079          -              - 
 Net loss                                                                           -            -          -              - 
                                                                           ----------     --------    -------    -----------
Balance at December 31, 1997                                               10,420,722     $104,208     28,214    $ 2,667,403 
 Issuance of common stock under stock purchase plan                            36,715          368          -              - 
 Exercise of common stock options                                              12,000          120          -              - 
 Issuance of common stock at $1.60 per share, net of issuance costs            23,439          234          -              - 
 Issuance of Series E preferred stock, net of issuance costs                        -            -     54,438      5,277,813 
 Grant of stock to finder                                                      64,000          640          -              - 
 Conversion of Series D and E preferred stock into common stock               270,364        2,704     (3,450)      (344,990)
 Net Loss                                                                           -            -          -              - 
                                                                           ----------     --------    -------    -----------
Balance at December 31, 1998                                               10,827,240     $108,274     79,202    $ 7,600,226 
                                                                           ==========     ========    =======    ===========
</TABLE>

<TABLE>
<CAPTION>                                                                                   DEFICIT
                                                                                          ACCUMULATED
                                                                                            DURING         RECEIVABLES FROM
                                                                         ADDITIONAL       DEVELOPMENT     TOTAL STOCKHOLDERS'
                                                                        PAID-IN CAPITAL      STAGE         STOCK      EQUITY
                                                                        -------------------------------------------------------
<S>                                                                     <C>              <C>              <C>        <C>  
 Exercise of common stock warrants at $1.25 per share                   $ 1,156,870      $          -     $       -   $ 1,166,200
 Exercise of common stock warrants at $2.50 per share, net of
   issuance costs                                                           779,413                 -             -       782,639
 Exercise of common stock warrants at $1.00 per share                        24,750                 -             -        25,000
 Exercise of common stock options                                            91,650                 -             -        93,010
 Stock repurchases                                                          (81,437)                -             -       (81,600)
 Net loss                                                                         -        (2,864,432)            -    (2,864,432)
                                                                        -----------      ------------     ---------   -----------
Balance at December 31, 1996                                             15,619,282       (19,207,237)            -     1,249,123
 Issuance of common stock at $2.50 per share, net of issuance costs       4,601,322                 -             -     4,620,362
 Exercise of common stock options                                            20,200                 -             -        20,480
 Issuance of common stock under stock purchase plan                          29,950                 -             -        30,101
 Conversion of Series D preferred stock into common stock                 2,087,017                 -             -             -
 Series D dividends paid in common stock                                    420,262          (422,341)            -             -
 Net loss                                                                         -        (4,453,933)            -    (4,453,933)
                                                                        -----------      ------------     ---------   -----------
Balance at December 31, 1997                                            $22,778,033      $(24,083,511)    $       -   $ 1,466,133
 Issuance of common stock under stock purchase plan                          38,010                 -             -        38,378
 Exercise of common stock options                                             7,920                 -             -         8,040
 Issuance of common stock at $1.60 per share, net of issuance costs          37,266                 -             -        37,500
 Issuance of Series E preferred stock, net of issuance costs              3,266,250        (3,266,250)            -     5,277,813
 Grant of stock to finder                                                    79,360                 -             -        80,000
 Conversion of Series D and E preferred stock into common stock             342,286                 -             -             -
 Net Loss                                                                         -        (5,638,203)            -    (5,638,203)
                                                                        -----------      ------------     ---------   -----------
Balance at December 31, 1998                                            $26,549,125      $(32,987,964)    $       -   $ 1,269,661
                                                                        ===========      ============     =========   ===========
</TABLE>

See accompanying notes.

                                      F-6
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                           STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
                                                                                                        FOR THE PERIOD
                                                                                                         JULY 6, 1988
                                                                                                        (INCEPTION) TO
                                                              YEARS ENDED DECEMBER 31,                   DECEMBER 31,
                                                     1998               1997               1996               1998
                                              ------------------------------------------------------------------------
<S>                                           <C>                <C>                <C>               <C>
OPERATING ACTIVITIES
Net loss                                      $(5,638,203)       $(4,453,933)       $(2,864,432)      $(29,045,498)
Adjustments to reconcile net loss to net      
 cash used for operating activities:          
  Stock issued for compensation                    80,000                  -                  -            100,100
  Stock issued for interest                             -                  -                  -              4,795
  Depreciation and amortization                   368,577            184,300            117,203          1,628,296
  Write-off of purchased technology                     -                  -                  -            503,500
  Changes in assets and liabilities:          
   Deposits                                           440            (14,360)                 -            (36,177)
   Notes receivable from officers                  12,000           (153,000)                 -           (141,000)
   Other current assets                            22,409            (11,613)            25,556            (66,459)
   Accounts payable                                91,819            172,273             93,350            515,413
   Accrued employee benefits                       16,018             34,219             16,328            167,849
   Other accrued expenses                         (19,577)           (12,374)             1,927             21,574
   Deferred revenue                                     -            (75,000)            75,000                  -
   Deferred rent                                   60,668                  -                  -             60,668
                                              -----------        -----------        -----------       ------------
Net cash used for operating activities         (5,005,849)        (4,329,488)        (2,535,068)       (26,286,939)
                                              
INVESTING ACTIVITIES                          
Purchase of technology                                  -                  -                  -           (570,000)
Purchase of equipment and improvements           (197,460)          (295,778)          (183,722)        (1,784,714)
Purchases of short-term investments                     -         (4,226,729)        (1,943,042)       (16,161,667)
Sales of short-term investments                   974,817          4,244,954          2,490,000         16,161,667
                                              -----------        -----------        -----------       ------------
Net cash provided by (used for) investing     
 activities                                       777,357           (277,553)           363,236         (2,354,714)
                                              
                                              
FINANCING ACTIVITIES                          
Net proceeds from issuance of warrants and    
 sale of common stock                              83,918          4,670,943          1,985,249         16,597,912
                                              
Net proceeds from issuance of preferred       
 stock                                          5,277,813                  -                  -         12,215,565
                                              
Net proceeds from convertible notes and       
 detachable warrants                                    -                  -                  -          1,068,457
                                              
Payments on capital lease obligations             (75,112)           (23,594)                 -            (98,706)
Payment on note payable                                 -                  -                  -            (92,750)
Proceeds from note payable                              -                  -                  -            334,323
Deferred offering costs                                 -             17,356            (17,356)                 -
                                              -----------        -----------        -----------       ------------
Net cash provided by financing activities       5,286,619          4,664,705          1,967,893         30,024,801
                                              
Net increase (decrease) in cash and cash      
 equivalents                                    1,058,127             57,664           (203,939)         1,383,148
                                              
Cash and cash equivalents at beginning of     
 the period                                       325,021            267,357            471,296                  -
                                              -----------        -----------        -----------       ------------
Cash and cash equivalents at end of the       
 period                                       $ 1,383,148        $   325,021        $   267,357       $  1,383,148
                                              ===========        ===========        ===========       ============
</TABLE>

                                      F-7
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)

                           STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
                                                                                                      JULY 6, 1988
                                                                                                     (INCEPTION) TO
                                                             YEARS ENDED DECEMBER 31,                 DECEMBER 31,
                                                    1998               1997              1996             1998
                                           ---------------------------------------------------------------------------
 
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
 INFORMATION
<S>                                           <C>                 <C>                 <C>             <C>
Equipment purchased by capital leases         $         -         $  288,722          $        -      $  288,772
Interest paid                                      26,692              7,763                   -          97,928
Imputed dividend on Series E Stock              3,266,250                  -                   -       3,266,250
Conversion of Series D preferred stock to                                                            
 common stock                                      44,990          2,097,342                   -       2,142,332
Conversion of Series E preferred stock to                                                           
 common stock                                     300,000                  -                   -         300,000
Series D stock issued for Series C Stock                -                  -           2,073,925       2,073,925
Series C dividends paid with Series D stock             -                  -             253,875         253,875
Series D dividends paid with common stock     $         -         $  422,341          $        -      $  422,341
                                              ===========         ==========          ==========      ==========
</TABLE>

See accompanying notes.

                                      F-8
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                         NOTES TO FINANCIAL STATEMENTS
                               December 31, 1998


1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

ORGANIZATION AND BUSINESS ACTIVITIES

Protein Polymer Technologies, Inc. (the "Company") was established to design,
produce and market genetically engineered protein polymers for a variety of
biomedical and specialty materials applications.  The Company was incorporated
in Delaware on July 6, 1988.  For the period from its inception to date, the
Company has been a development stage enterprise, and accordingly, the Company's
operations have been directed primarily toward developing business strategies,
raising capital, research and development activities, exploring marketing
channels and recruiting personnel.

LIQUIDITY

As of December 31, 1998, the Company had cash, cash equivalents and short-term
investments totaling $1,380,000 as compared to $1,300,000 at December 31, 1997.
As of December 31, 1998, the Company had working capital of $600,000, compared
to $697,000 at December 31, 1997. In April and May of 1998, the Company raised
approximately $5,400,000, net of expenses, from the private placement of the
Company's Series E Convertible Preferred Stock.

The Company believes its available cash, cash equivalents and short-term
investments would be sufficient to meet its anticipated capital requirements
through April 1999, which raises substantial doubt about its ability to continue
as a going concern. Substantial additional capital resources will be required to
fund continuing operations related to the Company's research, development,
manufacturing and business development activities. The Company believes there
may be a number of alternatives available to meet the continuing capital
requirements of its operations, such as collaborative agreements and public or
private financings. During 1999, the Company expects that the possible exercise
of existing warrants could result in additional funds for continuing operations.
Further, the Company is currently in preliminary discussions with a number of
potential collaborative partners and, based on the results of various materials
evaluations, revenues in the form of license fees, milestone payments or
research and development reimbursements could be generated. There can be no
assurance that any of these fundings will be consummated in the necessary time
frames needed for continuing operations or on terms favorable to the Company. If
adequate funds are not available, the Company will be required to significantly
curtail its operating plans and may have to sell or license out significant
portions of the Company's technology or potential products.


                                      F-9
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS

Short-term investments consist primarily of commercial paper, notes and short-
term U.S. Government securities with original maturities beyond three months and
are stated at estimated fair value.  Similar items with original maturities of
three months or less are considered cash equivalents.  The Company has
established guidelines relative to diversification and maturities that maintain
safety and liquidity.  The Company has not experienced any losses on its short-
term investments.

EQUIPMENT AND LEASEHOLD IMPROVEMENTS

Equipment and leasehold improvements are stated at cost, less accumulated
depreciation and amortization. Equipment is depreciated over the estimated
useful life of the asset, typically one to seven years, using the straight-line
method.  Leasehold improvements are amortized over the shorter of the lease term
or life of the asset.  Equipment and leasehold improvements consist of the
following:

                                                          DECEMBER 31,
                                                     1998              1997
                                                -----------------------------
Laboratory equipment                            $ 1,600,723       $ 1,459,476
Office equipment                                    175,128           171,490
Leasehold improvements                              297,635           245,060
                                                -----------------------------
                                                
                                                  2,073,486         1,876,026
Less accumulated depreciation and amortization   (1,475,039)      (1,106,4632)
                                                -----------------------------
                                                $   598,447       $   769,564
                                                =============================

RESEARCH AND DEVELOPMENT REVENUES AND EXPENSES

Research and development contract revenues are recorded as earned based on the
performance requirements of the contracts. If the research and development
activities are not successful, the Company is not obligated to refund payments
previously received. Milestone and license payments are recorded as revenue when
received as they have not been refundable and the Company has no future
performance obligations. Payments received in advance of amounts earned are
recorded as deferred revenue. Research and development costs are expensed as
incurred.

PRODUCT REVENUE RECOGNITION

Sales are recognized upon shipment of products to customers.

                                     F-10
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

ACCOUNTING STANDARD ON IMPAIRMENT OF LONG-LIVED ASSETS

In accordance with Statement of Financial Accounting Standards ("SFAS") No. 121,
Accounting for Impairment of Long-Lived Assets and for Long-Lived Assets to be
Disposed Of,  the Company regularly evaluates its long-lived assets for
indicators of possible impairment. To date, no such indicators have been
identified.

STOCK OPTIONS

As permitted by SFAS No. 123, Accounting for Stock-Based Compensation, the
Company has elected to follow Accounting Principles Board Opinion No. 25,
Accounting for Stock Issued to Employees, ("APB 25") and related Interpretations
in accounting for its employee stock options. Under APB 25, if the exercise
price of the Company's employee stock options equals or exceeds the deemed fair
value of the underlying stock on the date of grant, no compensation expense is
recognized. Options issued to non-employees are recorded at their fair value and
recognized over the related service period. The effects of using the fair value
accounting method, as described in SFAS Statement No. 123 are described below in
Note 2.

NET LOSS PER COMMON SHARE

The Company reports its earnings per share in accordance with SFAS No. 128,
Earnings per Share, which requires the presentation of both basic and diluted
earnings per share on the statements of operations. Basic earnings per share is
calculated based upon weighted-average number of outstanding common shares for
the period. Diluted earnings per share is calculated based upon weighted-average
number of outstanding common shares, plus the effect of dilutive stock options.

The net loss per common share for the years ended December 31, 1998, 1997 and
1996 is based on the weighted average number of shares of common stock
outstanding during the periods.  Potentially dilutive securities include
options, warrants and convertible preferred stock; however, such securities have
not been included in the calculation of the net loss per common share as their
effect is antidilutive.  Since this is the case, there is no difference between
the basic and dilutive net loss per common share for any of the periods
presented and none of the prior periods were required to be restated.  For
purposes of this calculation, net loss in 1998, 1997 and 1996 has been adjusted
for accumulated and/or paid dividends on the Preferred Stock.


                                     F-11
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

NEW ACCOUNTING STANDARDS

SFAS No. 130, Reporting Comprehensive Income, was issued in June 1997. This
standard requires that the Company disclose, either in the income statement or
in a separate financial statement, net income as currently reported and other
components of comprehensive income. Comprehensive income is defined as the
change in shareholders' equity during a period resulting from transactions and
other events and circumstances from non-owner sources. The Company adopted this
standard during 1998. For the years ended December 31, 1998, 1997 and 1996 the
Company did not have any components of comprehensive income as defined in SFAS
No. 130.

SFAS No. 131, Disclosures about Segments of an Enterprise and Related
Information, was issued in June 1997. This standard defines segments of an
enterprise as the components of the company whose operations are reviewed
regularly by the chief operating decision-maker in deciding how to allocate
resources and in assessing performance. It requires disclosures about products
and services, geographic areas and major customers. The Company adopted this
standard during 1998. Implementation of this standard did not affect the
Company's financial position or results of operations.

USE OF ESTIMATES

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities, the disclosure of
contingent assets and liabilities at the date of the financial statements and
the amount of revenue and expense reported during the period.  Actual results
could differ from those estimates. The financial statements contained herein do
not include any reserves or adjustments that may result from the Company's going
concern risk.

2.  STOCKHOLDERS' EQUITY

CONVERTIBLE PREFERRED STOCK

In April and May of 1998, the Company raised approximately $5.4 million from the
sale of 54,437.5 shares of the Company's Series E Convertible Preferred Stock
("Series E Stock") priced at $100 per share, with warrants to purchase an
aggregate of 3,266,250 shares of common stock to a small group of institutional
and accredited investors. In connection with this transaction, the Company
recorded a non-cash "imputed dividend" expense of $3,266,250 in order to account
for the difference between the fair market value of the stock and the beneficial
conversion feature.

                                      F-12
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2.  STOCKHOLDERS' EQUITY (CONTINUED)

Each share of Series E Stock is convertible at any time at the election of the
holder into 80 shares of common stock at a conversion price of $1.25 per share,
subject to certain antidilution adjustments.

No underwriters were engaged by the Company in connection with such issuance
and, accordingly, no underwriting discounts were paid. The offering is exempt
from registration under Section 4(2) of the Securities Act of 1933, as amended
(the "Securities Act"), and met the requirements of Rule 506 of Regulation D
promulgated under the Securities Act. The Company registered the shares of
common stock underlying the Series E Stock and the warrants with the Securities
and Exchange. This registration became effective on October 3, 1998. As of
December 31, 1998, 3,000 shares of Series E Stock had been converted into
240,000 shares of the Company's common stock.

Each share of Series E Stock received two common stock warrants. One warrant is
exercisable at any time for 40 shares of common stock at an exercise price of
$2.50 per share, and expires approximately 18 months after the close of the
offering; the other warrant is exercisable at any time for 20 shares of common
stock at an exercise price of $5.00 per share, and expires approximately 36
months after the close of the offering. In addition, an 18 month warrant to
acquire 200,000 common shares exercisable at $2.50 per share and a 36 month
warrant to acquire 100,000 common shares exercisable at $5.00 per share has been
issued as a finder and document review fee paid to a lead investor. An 18 month
warrant  to acquire 32,000 common shares exercisable at $2.50 per share, a 24
month warrant to acquire 16,000 common shares exercisable at $5.00 per share,
and 5 year warrants to acquire an aggregate of 25,200 common shares exercisable
at $2.50 per share were issued to certain persons for service as finders in
relation to the private placement.

In connection with the above private placement, the Company issued 26,420 shares
of its Series F Convertible Preferred Stock ("Series F Stock") in exchange for
the same number of shares of outstanding Series D Convertible Preferred Stock
("Series D Stock").

Each share of Series D and F Stock earns a cumulative dividend at the annual
rate of $10 per share, payable if and when declared by the Company's Board of
Directors, in the form of cash, common stock or any combination thereof. The
Series D and F Stock is convertible into common stock after two years from the
date of issuance at the holder's option. The conversion price at the time of
conversion is the lesser of $3.75 or the market price. The Series D and F Stock
is redeemable at the Company's option after four years from the date of
issuance. Automatic conversion of all of the Series D and F Stock will occur if:
(a) the Company completes a public offering of common stock at a price of $2.50
or higher; or (b) the holders of a majority thereof elect to convert. The
Company has the option to demand conversion of the Series D and F Stock if the
average market price of its common

                                     F-13
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2.  STOCKHOLDERS' EQUITY (CONTINUED)

stock equals or exceeds $5.00 per share over a period of twenty business days.
The Series D Stock has a liquidation preference of $100 per share plus
accumulated dividends.

The Series E Stock is convertible, at the option of the holder, into shares of
the Company's common stock, subject to anti-dilution adjustments, and has a
preference in liquidation of $100 per share, but only after any preference is
paid or declared set apart for the Series D Stock. The Company's Series F Stock
is equivalent to the Company's Series E Stock with regard to liquidation
preferences. All other terms of the Series F Stock remain the same as the
Company's Series D Stock.

Holders of the Series E Stock are entitled to receive dividends when and if
declared by the Board of Directors; however, no such dividends will be declared
or paid on the Series E Stock until the preferential cumulative dividends on the
Series D and F Stock have been fully paid or declared and set apart. Automatic
conversion of all Series E Stock will occur if: (a) the Company completes a
public offering of common stock at a price of $7.50 or higher; or (b) the
holders of more than 75% of outstanding Series E Stock elect to convert.

Series D, E and F Convertible Preferred Stock has been designated as non-voting
stock.

STOCK OPTION PLANS

In September 1996 the Company established the Protein Polymer Technologies,
Inc., Employee Stock Purchase Plan ("Plan").  The Plan commenced January 2,
1997, and allows for offering periods of up to two years with quarterly purchase
dates occurring the last business day of each quarter.  The purchase price per
share is generally calculated at 85% of the lower of the fair market value on an
eligible employee's entry date or the quarterly purchase date.  The maximum
number of shares available for issuance under the Plan is 500,000; an eligible
employee may purchase up to 5,000 shares per quarter.  The Plan Administrator
consists of a committee of at least two non-employee directors of the Company.
The Board may modify the Plan at any time. During 1998, a total of 36,715 shares
were purchased under the Plan at prices ranging from $0.79 to $1.06.  The value
of shares issued under the Plan as calculated in accordance with Statement 123
is not significant and is not included in the following pro forma information.

In June 1996, the Company adopted the 1996 Non-Employee Directors Stock Option
Plan ("1996 Plan"), which provides for the granting of nonqualified options to
purchase up to 250,000 shares of common stock to directors of the Company.  Such
grants of options to purchase 5,000 shares of common stock are awarded
automatically on the first business day of June during each calendar year to
every Participating Director then in office, subject to certain adjustments.  No
Participating Director is eligible to receive more than one grant per

                                     F-14
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2. STOCKHOLDERS' EQUITY (CONTINUED)

year.  The purchase price of each option is set at the fair market value of the
common stock on the date of grant. Each option has a duration of ten years, and
is exercisable six months after the grant date. The Board (or a designated
committee of the Board) administers the 1996 Plan.  At December 31, 1998,
110,000 options to purchase have been granted under the 1996 Plan.

The Company adopted the 1992 Stock Option Plan which provides for the issuance
of incentive and non-statutory stock options for the purchase of up to 1,500,000
shares of common stock to its key employees and certain other individuals.  The
options will expire ten years from their respective dates of grant. Options
become exercisable ratably over periods of up to five years from the dates of
grant. At December 31, 1998, options to purchase 401,600 shares of common stock
were exercisable, and 566,400 shares were available for future grant.

The Company adopted the 1989 Stock Option Plan which provides for the issuance
of incentive and non-statutory stock options for the purchase of up to 500,000
shares of common stock to key employees and certain other individuals. As the
options have a ten year life and were to expire in March 1999, the Board of
Directors approved an action to cancel existing valid options granted prior to
1991 in return for a reissuance of fully vested ten year options at the closing
price on the date of approval, November 23, 1998. Options become exercisable
ratably over periods of up to five years from the date of grant. At December 31,
1998, options for 368,500 shares were exercisable, and 125,000 shares were
available for future grant.

Since inception, the Company has granted non-qualified options outside the
option plans to employees, directors and consultants of the Company.  At
December 31, 1998, options for 213,500 shares were exercisable.

                                     F-15
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2.  STOCKHOLDERS' EQUITY (CONTINUED)

The following table summarizes the Company's stock option activity:

<TABLE>
<CAPTION>
                                                       Years ended December 31,
                          -----------------------------------------------------------------------------
                                      1998                      1997                      1996
                          --------------------------  ------------------------  ------------------------
                                          Weighted                  Weighted                   Weighted
                                           Average                   Average                    Average
                                          Exercise                  Exercise                   Exercise
                              Options      Price        Options      Price       Options         Price
                            ---------    ----------   -----------   ----------  -----------    ---------
<S>                        <C>           <C>          <C>           <C>         <C>             <C>
Outstanding - beginning                                                                   
   of year                  1,540,600     $1.52        1,393,600      $1.38       1,064,600      $0.90
   Granted                    568,000     $0.99          190,000      $2.34         465,000      $2.27
   Exercised                  (12,000)   ($0.67)         (28,000)    ($0.73)       (136,000)    ($0.68)
   Forfeited/Expired         (331,600)   ($0.83)         (15,000)    ($0.60)              -          -
Outstanding - end of year   1,765,000     $1.51        1,540,600      $1.52       1,393,600      $1.38
                            =========    ======        =========      =====       =========      =====
Exercisable - end of year   1,093,600     $1.36          916,600      $1.56         732,100      $1.08
                            =========    ======        =========      =====       =========      =====
</TABLE>

The exercise prices for options outstanding as of December 31, 1998 range from
$0.53 to $3.75.  The weighted average remaining contractual life of these
options is approximately 7.32 years.

STATEMENT 123 PRO FORMA INFORMATION

Pro forma information regarding net loss is required by SFAS No. 123, and has
been determined as if the Company had accounted for its employee stock options
under the fair value method prescribed by SFAS No. 123, using the Black-Scholes
option pricing model. The fair value was estimated using the following weighted-
average assumptions: a risk free interest rate of 6.00% for 1998, 6.43% for 1997
and 6.22% for 1996; a volatility factor of the expected market price of the
Company's common stock of .89% for 1998, 102% for 1997 and 110% for 1996;
expected option lives of 10 years for 1998, 5 years for 1997, 8 years for 1996;
and no dividend yields for all years.

The Black-Scholes option valuation model was originally developed for use in
estimating the fair value of traded options which have no vesting restrictions
and are fully transferable.  In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility.  Because the Company's employee stock options have characteristics
significantly different from those of traded options and because changes in the
subjective input assumptions can materially affect the fair value estimate, in

                                     F-16
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

2.  STOCKHOLDERS' EQUITY (CONTINUED)

management's opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of its employee stock options.

For purposes of pro forma disclosures, the estimated fair value of the options
is amortized to expense over the expected life of the options. The Company's pro
forma information is as follows:

                                           1998          1997          1996
                                      -------------  ------------  ------------
Net loss as reported                   $(9,182,526)  $(4,886,615)  $(3,356,299)
Net loss per share as reported               (0.88)        (0.52)        (0.51)
Net loss pro forma                      (9,877,344)   (5,188,511)   (3,492,030)
Net loss per share pro forma                  (.94)        (0.55)        (0.53)
Weighted average fair value per share                              
  of options granted during the year   $      0.87   $      1.77   $      2.06


The pro forma effect on net loss for 1998, 1997 and 1996 is not representative
of the pro forma effect on net loss in future years because it does not take
into consideration pro forma compensation expense from option grants made prior
to 1995.

COMMON STOCK WARRANTS

As a result of the Company's initial public offering, unit holders were granted
redeemable warrants ("Public Warrants") for 1,667,500 shares of common stock,
which are exercisable at $8.00 per share, and are redeemable at the option of
the Company at a redemption price of $.10 at any time after January 21, 1993,
based on the price of the common stock and other requirements. In November 1996,
the Company extended the expiration date of the Public Warrants to January 21,
1998.  In December 1997, the Company extended the expiration date of the Public
Warrants to March 27, 1998.  In March 1998, the Company extended the expiration
date of the Public Warrants to March 31, 1999.

3.  STOCKHOLDER PROTECTION AGREEMENT

In 1997, the Board of Directors of the Company adopted a Stockholder Protection
Agreement ("Rights Plan") that distributes Rights to stockholders of record as
of September 10, 1997.  The Rights Plan contains provisions to protect
stockholders in the event of an unsolicited attempt to acquire the Company.  The
Rights trade together with the common stock, and generally become exercisable
ten business days after a person or group acquires or announces the intention to
acquire 15% or more of the outstanding shares of Company common stock, with
certain permitted exceptions.  The Rights then generally allow the holder to
acquire additional shares of Company capital stock at a discounted price.  The

                                     F-17
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

3.  STOCKHOLDER PROTECTION AGREEMENT (CONTINUED)

issuance of the Rights is not a taxable event, does not affect the Company's
reported earnings per share, and does not change the manner in which the
Company's common stock is traded.

4.  COMMITMENTS

The Company leases its office and research facilities totaling 21,000 square
feet under an operating lease, which expires in May 2005. The facilities lease
is subject to an annual escalation provision based upon the Consumer Price
Index. The lease provides for deferred rent payments; however, for financial
purposes rent expense is recorded on a straight-line basis over the term of the
lease. Accordingly, deferred rent in the accompanying balance sheet represents
the difference between rent expense accrued and amounts paid under the lease
agreement.

Annual future minimum operating and capital lease payments are as follows:
<TABLE> 
<CAPTION> 
                                                             Obligations  
                                            Operating           Under     
       Year ending December 31,              Leases         Capital Leases  
       ------------------------          ------------       --------------
<S>                                      <C>                 <C>
1999                                      $  439,225          $101,803
2000                                         451,841            87,228
2001                                         460,933            25,651
2002                                         461,782                 -
2003                                         473,200                 -
Thereafter                                   651,460                 -
                                          ----------          --------
Total minimum operating and capital                           
  lease payments                          $2,938,441           214,682
                                          ==========          
Less amount representing interest                              (24,616)
                                                              -------- 
Present value of remaining minimum                            
  capital lease payments                                       190,066
Less amount due in one year                                    (84,518)
Long-term portion of obligations under                        --------
  capital leases                                              $105,548
                                                              ========
</TABLE> 
Cost and accumulated depreciation of equipment held under capital leases as of
December 31, 1998 was $279,497 and $89,776, respectively.  The carrying amount
of the Company's obligations under its capital lease agreements approximate
their fair value and the implicit interest rate approximates the Company's
borrowing rate.

                                     F-18
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4.  COMMITMENTS (CONTINUED)

Rent expense was approximately $442,633, $412,000, $306,000 and $3,220,633 for
the years ended December 31, 1998, 1997 and 1996 and for the period July 6, 1988
(inception) through December 31, 1998, respectively.

5.  RESEARCH AND DEVELOPMENT CONTRACTS AND ROYALTIES

Under an agreement completed in October 1991 with Telios Pharmaceuticals, Inc.,
("Telios"), now a wholly-owned subsidiary of Integra Life Sciences Corp., Telios
granted the Company a worldwide, exclusive sublicense to use Telios patent
rights to develop and sell protein polymers containing the RGD amino acid
sequence in two or more polymer segments for the purpose of in vitro cell
culture.  In exchange for this sublicense, the Company has agreed to pay Telios
royalties on net revenues derived by the Company from its sales of RGD
containing polymers at a rate equal to 5% of net revenues, until such net
revenues reach $500,000, and 3.5% of net revenues in excess of $500,000.  There
is a required minimum royalty payment by the Company of $25,000 per year.

6.  INCOME TAXES

At December 31, 1998, the Company had net operating loss carryforwards of
approximately $26,685,000 for federal income tax purposes, which may be applied
against future income, if any, and will begin expiring in 2004 unless previously
utilized.  In addition, the Company had California net operating loss
carryforwards of approximately $9,729,000.  The California tax loss
carryforwards continue to expire ($776,000 expired in 1998).  The difference
between the tax loss carryforwards for federal and California purposes is
attributable to the capitalization of research and development expenses for
California tax purposes, the required 50% limitation in the utilization of
California loss carryforwards, and the expiration of certain California tax loss
carryforwards.

The Company also has federal and California research and development tax credit
carryforwards of approximately $861,000 and $401,000, respectively, which will
begin expiring in 2004 unless previously utilized.

As a result of an ownership change that occurred in January 1992, approximately
$2,700,000 of the Company's federal net operating loss carryforwards will be
subject to an annual limitation regarding utilization against taxable income in
future periods.  However, the Company believes that such limitations will not
have a material impact upon the utilization of the carryforwards.


                                     F-19
<PAGE>
 
                      PROTEIN POLYMER TECHNOLOGIES, INC.
                         (A DEVELOPMENT STAGE COMPANY)


                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

6.  INCOME TAXES (CONTINUED)

Significant components of the Company's deferred tax assets as of December 31,
1998 are shown below. A valuation allowance of $11,749,000 has been recognized
to offset the deferred tax assets as realization of such assets is uncertain.


                                                     1998              1997
                                                -----------       -----------
Deferred tax assets:                            
 Net operating loss carryforwards               $ 9,899,000       $ 7,922,000
 Research and development credits                 1,122,000           827,000
 Other, net                                         728,000           530,000
                                                -----------       -----------
Total deferred tax assets                        11,749,000         9,279,000
Valuation allowance for deferred tax assets     (11,749,000)       (9,279,000)
                                                -----------       -----------
Net deferred tax assets                         $         -       $         -
                                                ===========       ===========

7.  EMPLOYEE BENEFITS PLAN

On January 1, 1993, the Company established a 401(k) Savings Plan for
substantially all employees who meet certain service and age requirements.
Participants may elect to defer up to 20% of their compensation per year,
subject to legislated annual limits.  Each year the Company may provide a
discretionary matching contribution.  As of December 31, 1998, the Company had
not made a contribution to the Savings Plan.

                                     F-20
<PAGE>
 
ITEM 8.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
          FINANCIAL DISCLOSURE

          None.


                                    PART III
                                        

     Items 9, 10, 11 and 12 are incorporated by reference from the Company's
definitive Proxy Statement to be filed by the Company with the Commission no
later than April 30, 1999.


ITEM 13.  EXHIBITS, FINANCIAL STATEMENTS AND REPORTS ON FORM 8-K

(a)(1) and (2) Financial Statements and Schedules

          The Financial Statements are incorporated herein as a part of Item 7.


(a)(3)    Exhibits

          The following documents are included or incorporated by reference:

     Exhibit
     Number         Description
     ------         -----------

     3.1 (6)        Certificate of Incorporation of the Company, as amended.

     3.1.1          Certificate of Designation of Series E Convertible Preferred
                    Stock.

     3.1.2          Certificate of Designation of Series F Convertible Preferred
                    Stock.

     3.2 (6)        Bylaws of the Company, as amended.

     4.1 (4)        Warrant Agreement, dated January 21, 1992, between the
                    Company and Continental Stock Transfer and Trust Company.

     4.2 (1)        Revised Form of Redeemable Warrant.

     10.1 (2)       Lease, with exhibits, dated October 16, 1991, between the
                    Company and Sycamore/San Diego Investors, together with an
                    amendment thereto dated April 21, 1992.

     10.2 (3)       Amendment to lease, between the Company and Sycamore/San
                    Diego Investors, dated June 22, 1992.

     10.3 (1)       Sublicense Agreement for RGD-Containing Engineered Protein
                    Polymers, with exhibit attached, dated October 1, 1991,
                    between the Company and Telios Pharmaceuticals, Inc.

     10.4 (1)       1989 Stock Option Plan, together with forms of Incentive
                    Stock Option Agreement and Nonstatutory Option Agreement.


                                      23
<PAGE>
 
     10.5 (4)       1992 Stock Option Plan of the Company, together with forms
                    of Incentive Stock Option Agreement and Nonstatutory Option
                    Agreement.

     10.6 (1)       Form of Employee's Proprietary Information and Inventions
                    Agreement.

     10.7 (1)       Form of Consulting Agreement.

     10.8 (1)       Form of Indemnification Agreement.

     10.9 (4)       License Agreement, dated as of April 15, 1992, between the
                    Board of Trustees of the Leland Stanford Junior University
                    and the Company.

     10.10 (5)      Replacement ProNectin F License Agreement between Cellco,
                    Inc. and the Company, dated February 15, 1995.

     10.11 (6)      License and Development Agreement between the Company and
                    Ethicon, Inc., dated September 14, 1995.

     10.12 (6)      Supply Agreement between the Company and Ethicon, Inc.,
                    dated September 14, 1995.

     10.13 (6)      Escrow Agreement between Protein Polymer Technologies, Inc.
                    and Ethicon, Inc., dated September 14, 1995.

     10.14 (6)      Amended and Restated Registration Rights Agreement dated
                    September 14, 1995, among the Company and the holders of its
                    Series D Preferred Stock.

     10.15 (6)      Securities Purchase Agreement related to the sale of the
                    Company's Series D Preferred Stock.

     10.16 (6)      Form of Warrant to Purchase Common Stock issued in
                    connection with the Series D Preferred Stock.

     10.17 (7)      Letter Agreement dated as of October 4, 1996 between the
                    Company and MBF I, LLC ("MBF") relating to the provision of
                    consulting and advisory services.

     10.18 (7)      Form of Warrant with respect to a warrant for 50,000 shares
                    issued to MBF, and to be used with respect to additional
                    warrants which may be issued to MBF.

     10.19 (7)      Registration Rights Agreement dated as of October 4, 1996
                    between the Company and MBF.

     10.20 (7)      Letter Agreement dated December 9, 1996 between the Company
                    and Ethicon, Inc. with respect to an extension of the
                    License and Development Agreement between them dated
                    September 14, 1995.

     10.21 (7)      Securities Purchase Agreement dated as of January 6, 1997
                    among the Company and the investors named therein relating
                    to the sale and purchase of 1,904,000 shares of the
                    Company's common stock.

                                      24
<PAGE>
 
     10.22 (8)      Lease, with exhibits, dated March 1, 1996 between the
                    Company and Sycamore/San Diego Investors.

     10.23 (8)      Second Amendment to Lease between the Company and
                    Sycamore/San Diego Investors, dated March 1, 1996.

     10.24 (8)      1996 Non-Employee Directors' Stock Option Plan.

     10.25 (8)      Employment Agreement, dated as of November 1, 1996, between
                    the Company and J. Thomas Parmeter.

     10.26 (8)      Employment Agreement, dated as of November 1, 1996, between
                    the Company and John E. Flowers.

     10.27 (8)      Employment Agreement, dated as of November 1, 1996, between
                    the Company and Joseph Cappello.

     10.28 (8)      Employment Agreement, dated as of November 1, 1996, between
                    the Company and Franco A. Ferrari.

     10.29 (8)      Employment Agreement, dated as of November 1, 1996, between
                    the Company and Erwin R. Stedronsky.

     10.30 (9)      Stockholder Protection Agreement, dated August 22, 1997,
                    between the Company and Continental Stock Transfer & Trust
                    Company as rights agent.

     10.31 (10)     Employee Stock Purchase Plan, together with Form of Stock
                    Purchase Agreement.

     10.32 (11)     Lease, with rider and exhibits, dated April 13, 1998,
                    between the Company and Sycamore/San Diego Investors

     10.33 (12)     First Amendment to Stockholder Protection Agreement dated
                    April 24, 1998, between the Company and Continental Stock
                    Transfer & Trust Company as rights agent.

     10.34          Securities Purchase Agreement related to the sale of the
                    Company's Series E Convertible Preferred Stock dated as of
                    April 13, 1998 among the Company and Investors named therein
                    related to the purchase of 54,437.50 shares of Series E
                    Preferred Stock.

     10.35          Form of First Warrants to purchase Common Stock related to
                    the sale of the Company's Series E Preferred Stock.

     10.36          Form of Second Warrants to purchase Common Stock related to
                    the sale of the Company's Series E Preferred Stock.

     10.37          Letter of Agreement dated April 13, 1998 between the Company
                    and Johnson & Johnson Development Corporation for the
                    exchange of up to 27,317 shares of Series D Preferred Stock
                    for a like number of shares of Series F Preferred Stock.

     23.1           Consent of Ernst & Young LLP, Independent Auditors.

     27             Financial Data Schedule.


                                      25
<PAGE>
 
  (1)  Incorporated by reference to the Company's Registration Statement on Form
       S-1 (No. 33-43875) filed with the Commission on November 12, 1991, as
       amended by Amendments Nos. 1, 2, 3 and 4 thereto filed on November 25,
       1991, December 23, 1991, January 17, 1992 and January 21, 1992,
       respectively.

  (2)  Incorporated by reference to Registrant's Report on Form 10-Q for the
       quarter ended March 31, 1992, as filed with the Commission on May 14,
       1992.

  (3)  Incorporated by reference to Registrant's Report on Form 10-Q for the
       quarter ended September 30, 1992, as filed with the Commission on
       November 13, 1992.

  (4)  Incorporated by reference to Registrant's Report on Form 10-K for the
       fiscal year ended December 31, 1992, as filed with the Commission on
       March 31, 1993.

  (5)  Incorporated by reference to Registrant's Report on Form 10-KSB for the
       fiscal year ended December 31, 1994, as filed with the Commission on
       March 30, 1995.

  (6)  Incorporated by reference to Registrant's Report on Form 10-Q for the
       quarter ended September 30, 1995, as filed with the Commission on October
       24, 1995.

  (7)  Incorporated by reference to Registrant's current Report on Form 8-K, as
       filed with the Commission on January 7, 1997.

  (8)  Incorporated by reference to Registrant's Report on Form 10-KSB for the
       fiscal year ended December 31, 1996, as filed with the Commission on
       March 27, 1997.

  (9)  Incorporated by reference to Registrant's Current Report on Form 8-K, as
       filed with the Commission on August 27, 1997.

  (10) Incorporated by reference to Registrant's Report on Form 10-KSB for the
       fiscal year ended December 31, 1997, as filed with the Commission on
       April 9, 1998.

  (11) Incorporated by reference to Registrant's Report on Form 10-Q for the
       quarter ended March 31, 1998, as filed with the Commission on May 14,
       1998.

  (12) Incorporated by reference to Registrant's Report on Form 10-Q for the
       quarter ended June 30, 1998, as filed with the Commission on August 13,
       1998.
 


(b)       Reports on Form 8-K.

          On October 13, 1998, Protein Polymer Technologies, Inc. filed a
          Current Report on Form8-K with the Commission.  In Item 5 of the
          Report, the Company reported that it had been notified by the National
          Association of Securities Dealers ("NASD") that its public warrants
          (PPTIW), issued in conjunction with PPTI's 1992 public offering, no
          longer met Nasdaq's listing requirements due to a lack of market
          makers, and as a consequence, would no longer be listed on The Nasdaq
          Stock Market(R).


                                      26
<PAGE>
 
                                   SIGNATURE


     In accordance with Section 13 or 15(d) of the Exchange Act, the registrant
has caused this report to be signed on its behalf by the undersigned, thereunto
duly authorized.


                                       PROTEIN POLYMER TECHNOLOGIES, INC.


February 26, 1999                  By  /s/  J. THOMAS PARMETER
                                      --------------------------------------
                                            J. Thomas Parmeter
                                            Chairman of the Board, Chief
                                            Executive Officer, President


     In accordance with the Exchange Act, this report has been signed below by
the following persons on behalf of the registrant and in the capacities and on
the dates indicated.


Signature                   Capacity                               Date
- ---------                   --------                               ----

/s/  J. THOMAS PARMETER     Chairman of the Board, Chief       February 26, 1999
- -------------------------   Executive Officer, President
J. Thomas Parmeter      
 
 
/s/  JANIS Y. NEVES         Director of Finance, Controller,   February 26, 1999
- -------------------------   and Assistant Secretary 
Janis Y. Neves      
 
 
/s/  PATRICIA J. CORNELL      Director                         February 26, 1999
- -------------------------
Patricia J. Cornell
 
/s/  EDWARD E. DAVID          Director                         February 26, 1999
- -------------------------
Edward E. David
 
/s/  PHILIP J. DAVIS          Director                         February 26, 1999
- -------------------------
Philip J. Davis
 
/s/  PATRICK A. GERSCHEL      Director                         February 26, 1999
- -------------------------
Patrick A. Gerschel
 
/s/  EDWARD J. HARTNETT       Director                         February 26, 1999
- -------------------------
Edward J. Hartnett
 
/s/  J. PAUL JONES            Director                         February 26, 1999
- -------------------------
J. Paul Jones
 
/s/  BRENT R. NICKLAS         Director                         February 26, 1999
- -------------------------
Brent R. Nicklas
 
/s/  GEORGE R. WALKER         Director                         February 26, 1999
- -------------------------
George R. Walker


                                      27

<PAGE>
 
                                                                   EXHIBIT 3.1.1


                           CERTIFICATE OF DESIGNATION
                           --------------------------

                                       OF
                                       --

                            SERIES E PREFERRED STOCK
                            ------------------------

                                       OF
                                       --

                       PROTEIN POLYMER TECHNOLOGIES, INC.
                       ----------------------------------

                           (Pursuant to Section 151)

          The undersigned, J. Thomas Parmeter and Philip J. Davis, the President
and Secretary, respectively, of PROTEIN POLYMER TECHNOLOGIES, INC., a
                                ----------------------------------   
corporation organized and existing under and by virtue of the General
Corporation Law of the State of Delaware (the "Corporation"), do hereby certify,
                                               -----------                      
in the name of and on behalf of the Corporation, and as its corporate act, that
in accordance with the Corporation's Bylaws, at a meeting of the Board of
Directors of the Corporation held on March 27, 1998, the Board adopted the
following preamble and resolution:

          Whereas the Certificate of Incorporation of the Corporation provides
          -------                                                             
for a class of shares of stock designated "Preferred Stock," issuable from time
to time in one or more series, and vests in the Board of Directors of the
Corporation the authority to fix the designations and the powers, preferences
and rights, and the qualifications, limitations or restrictions thereof, and to
fix the number of shares constituting any such series:

          NOW,  THEREFORE, BE IT

               RESOLVED that there shall be a series of Preferred Stock of the
               --------                                                       
          Corporation to be designated as follows and that the powers,
          preferences and relative, participating, optional or other rights of
          the shares of such series of Preferred Stock and the qualifications,
          limitations and restrictions thereof shall be as follows:

          Section 1.  Designation.  There is hereby provided a series of
                      -----------                                       
Preferred Stock designated the Series E Convertible Preferred Stock (the "Series
                                                                          ------
E Preferred Stock").
- -----------------   

          Section 2.  Number.  The number of shares constituting the Series E
                      ------                                                 
Preferred Stock is fixed at fifty-five thousand (55,000) shares.

          Section 3.  Definitions.  For purposes of this Certificate of
                      -----------                                      
Designation the following definitions shall apply:

               "Board" shall mean the Board of Directors of the Company.
                -----                                                   

                                      -1-
<PAGE>
 
          "Commitment Date" shall mean the date immediately prior to the date of
           ---------------                                                      
original issuance of the Series E Preferred Stock.

          "Company" shall mean this corporation.
                -------                              

          "Common Stock" shall mean the Common Stock, par value $0.01, of
                ------------                                                  
the Company.

          "Common Stock Value" shall mean, as of any given date, (i) if the
           ------------------                                              
Common Stock is traded on a national securities exchange, or is designated as a
National Market System security on NASDAQ, the average of the closing prices
thereof as reported on such exchange or NASDAQ-NMS, as the case may be, during
the 20 consecutive trading days preceding the trading day immediately prior to
such date, or, if no sale occurred on any such trading day, then the mean
between the closing bid and asked prices on such exchange or NASDAQ-NMS on such
trading day, (ii) if the Common Stock is actively traded over-the-counter (other
than NASDAQ-NMS), the arithmetic average (for 20 consecutive trading days) of
the mean between the low bid and high asked prices as of the close of business
during the 20 consecutive trading days preceding the trading day immediately
prior to such date, as reported by the National Association of Securities
Dealers Automated Quotation system or other source, (iii) if the Common Stock is
not traded on an exchange, NASDAQ-NMS, or actively traded over-the-counter, the
fair market value thereof, shall be determined in good faith mutually by the
Board, and the holders of a Majority of the Series F Preferred Stock and 75% of
the Series E Preferred Stock, provided that if they are unable to reach
agreement on any valuation matter, such valuation shall be submitted to and
determined by a nationally recognized independent investment banking firm
selected by the Board, the holders of a Majority of the Series F Preferred Stock
and the holders of a 75% of the Preferred Stock (or, if such selection cannot be
made, by a nationally recognized independent investment banking firm selected by
the American Arbitration Association in accordance with its commercial
arbitration rules).

               "Junior Stock" shall mean the Common Stock of the Company,
                ------------                                             
whether presently outstanding or hereafter issued.

               "Majority of the Series F Preferred Stock" shall mean more than
                ----------------------------------------                      
50% of the outstanding Series F Preferred Stock.

               "75% of the Series E Preferred Stock" shall mean at least 75% of
                -----------------------------------                            
the outstanding Series E Preferred Stock.

               "Series D Preferred Stock" shall mean the Company's Series D 10%
                ------------------------                                       
Cumulative Convertible Preferred Stock.

               "Series F Preferred Stock" shall mean the Company's Series F 10%
                ------------------------                                       
Cumulative Convertible Preferred Stock.

          "Subsidiary" shall mean any corporation a majority of the Voting Stock
           ----------                                                           
of which is, at the time as of which any determination is being made, owned by
the Company either directly or through one or more Subsidiaries.

                                      -2-
<PAGE>
 
          "Voting Stock" shall mean any shares having general voting power in
           ------------                                                      
electing the Board of Directors (irrespective of whether or not at the time
stock of any other class or classes has or might have voting power by reason or
the happening of any contingency).  The Common Stock is Voting Stock and the
Series D Preferred Stock, Series E Preferred Stock and Series F Preferred Stock
is not Voting Stock.

          Section 4.  Dividends.  The holders of the then outstanding Series E
                      ---------                                               
Preferred Stock shall be entitled to receive dividends (other than a dividend
paid solely in Common Stock), when and as declared by the Board, out of any
funds legally available therefor, provided, however, that no such dividends
                                  --------  -------                        
shall be declared or paid on the Series E Preferred Stock until the preferential
cumulative dividends on the Series D Preferred Stock and the Series F Preferred
Stock shall have been first fully paid or declared and set apart.  If the Board
shall elect to declare such dividends, such dividends shall be declared in equal
amounts per share on all shares of Series D Preferred Stock, Series E Preferred
Stock, Series F Preferred Stock and Common Stock, but with each share of Series
D Preferred Stock, Series E Preferred Stock and Series F Preferred Stock being
entitled to dividends based upon the number of shares of Common Stock into which
such share of Series D Preferred Stock, Series E Preferred Stock or Series F
Preferred Stock could be converted at the record date for the determination of
shareholders entitled to receive such dividend or, if no such record date is
established, on the date such dividend is declared.

          Section 5.  Liquidation Rights of Series E Preferred Stock.
                      ---------------------------------------------- 

          (a) Preference.  Subject to the conversion rights set forth in Section
              ----------                                                        
9 hereof, in the event of any liquidation, dissolution or winding up of the
Company, whether voluntary or involuntary, the holders of the Series E Preferred
Stock and Series F Preferred Stock then outstanding shall be entitled to be paid
out of the assets of the Company available for distribution to its shareholders,
whether such assets are capital, surplus or earnings, before any payment or
declaration and setting apart for payment of any amount shall be made in respect
of the Junior Stock, but only after any preference is paid or set apart for the
Series D Preferred Stock, an amount equal to one hundred dollars ($100.00) per
share of Series E Preferred Stock and an amount equal to one hundred dollars
($100.00) per share of Series F Preferred Stock, then after such preference is
paid with respect to the Series E Preferred Stock and Series F Preferred Stock,
in the case of the Series E Preferred Stock an amount equal to any declared and
unpaid dividends thereon, and in the case of the Series F Preferred Stock an
amount equal to any accrued and unpaid dividends whether or not declared, and no
more.  If upon any liquidation, dissolution, or winding up of the Company,
whether voluntary or involuntary, after the distribution of any preference on
the Series D Preferred Stock is paid or set apart, the assets to be distributed
to the holders of the Series E Preferred Stock and Series F Preferred Stock
shall be insufficient to permit the payment to such shareholders of the full
preferential amounts aforesaid, then all of the remaining assets of the Company
to be distributed shall be distributed among the holders of the Series E
Preferred Stock and Series F Preferred Stock ratably in accordance with their
respective liquidation preferences.

          (b) Remaining Assets.  After the payment or distribution to the
              ----------------                                           
holders of the Series D Preferred Stock, the Series E Preferred Stock and the
Series F Preferred Stock  of the full preferential amounts aforesaid, the
holders of the Junior Stock 

                                      -3-
<PAGE>
 
then outstanding shall be entitled to receive ratably all remaining assets of
the Company to be distributed.

          Section 6.  Merger, Consolidation.
                      --------------------- 

               (a)  At any time, in the event of:

          (1) any consolidation or merger of the Company with or into any other
corporation or other entity or person (other than a merger of a wholly owned
subsidiary into the Company), or

                    (2) a sale or other disposition of all or substantially all
of the assets of the Company, then:

                             (A) After the full payments, if any, required to be
made to the holders of the Series D Preferred Stock shall have been made,
holders of the Series E Preferred Stock and Series F Preferred Stock shall
receive, for each share of such stock in cash or in securities (including,
without limitation, debt securities) received from the acquiring corporation, or
a combination thereof, at the closing of any such transaction, an amount equal
to $100.00 (appropriately adjusted for subdivisions or combinations of the
Series E Preferred Stock or Series F Preferred Stock), then after such
preference is paid with respect to the Series E Preferred Stock and Series F
Preferred Stock, an amount equal to all declared and unpaid dividends on each
share of Series E Preferred Stock and an amount equal to all accrued and unpaid
dividends on each share of Series F Preferred Stock (whether or not earned or
declared, to and including the date full payment shall be tendered to such
holders with respect to such transaction), and no more; provided, however, in
                                                        -----------------
the event of any such transaction, if the amounts available to be distributed to
the holders of the Series E Preferred Stock and Series F Preferred Stock shall
be insufficient to permit the payment to such shareholders of the full amounts
provided for in this Section 6(a)(2)(A), then the amounts to be so distributed
shall be distributed ratably in accordance with their respective preferences;
and

                             (B) after the payment or distribution to the
holders of the Series D Preferred Stock, the holders of the Series E Preferred
Stock and to the holders of the Series F Preferred Stock of the full
preferential amounts stated in Section 6(a)(2)(A) hereof, the remaining proceeds
of such transaction shall be distributed ratably to the holders of Junior Stock
then outstanding.

          (b) Any securities or other property to be delivered to the holders of
the Series E Preferred Stock, Series F Preferred Stock  or Common Stock pursuant
to Section 6(a) hereof shall be valued as follows:

                    (1) Securities not subject to investment letter or other
similar restrictions on free marketability:

                             (A) If traded on a securities exchange, the value
shall be deemed to be the average of the closing prices of the securities on
such exchange over the 30-day period ending three (3) days prior to the closing;

                                      -4-
<PAGE>
 
                             (B) If actively traded over-the-counter, the value
shall be deemed to be the average of the closing bid prices over the 30-day
period ending three (3) days prior to the closing; and

                             (C) If there is no active public market, the value
shall be the fair market value thereof, as mutually determined by the Company
and the holders of a Majority of the Series F Preferred Stock and 75% of the
Series E Preferred Stock.

          (2) The method of valuation of securities subject to investment letter
or other restrictions on free marketability shall be to make appropriate
discount from the market value determined as above in paragraph (1)(A), (B) or
(C) to reflect the approximate fair market value thereof, as mutually determined
by the Company and the holders of a Majority of the Series F Preferred Stock and
75% of the Series E Preferred Stock.

          (3) All other securities or other property shall be valued at the fair
market value thereof, as mutually determined by the Company and the holders of a
Majority of the Series F Preferred Stock and 75% of the Series E Preferred
Stock.

          (4) If the holders of a Majority of the Series F Preferred Stock, 75%
of the Series E Preferred Stock and the Company are unable to reach agreement on
any valuation matter, such valuation shall be submitted to and determined by a
nationally recognized independent investment banking firm selected by the Board,
75% of the Series E Preferred Stock and the holders of a Majority of the Series
F Preferred Stock (or, if such selection cannot be made, by a nationally
recognized independent investment banking firm selected by the American
Arbitration Association in accordance with its rules).

          (c) In the event the requirements of Section 6(a) hereof are not
complied with, the Company shall forthwith either:

                    (1) Cause such closing to be postponed until such time as
the requirements of this Section 6 have been complied with; or

          (2) Cancel such transaction, in which event the rights, preferences
and privileges of the holders of the Series E Preferred Stock and Series F
Preferred Stock shall revert to and be the same as such rights, preferences and
privileges existing immediately prior to the date of the first notice referred
to in Section 6(d) hereof.

          (d) The Company shall give each holder of record of Series E Preferred
Stock and Series F Preferred Stock  written notice of such impending transaction
not later than thirty (30) days prior to the shareholders' meeting called to
approve such transaction, or thirty (30) days prior to the closing of such
transaction, whichever is earlier, and shall also notify such holders in writing
of the final approval of such transaction.  The first of such notices shall
describe the material terms and conditions of the impending transaction and the
provisions of this Section 6, and the Company shall thereafter give such holders
prompt notice of any material changes.  The transaction shall in no event take
place sooner than thirty (30) days after the Company has given the first notice
provided for herein or sooner than ten (10) days after the Company has given
notice of any material changes provided for herein; provided, 
                                                    --------

                                      -5-
<PAGE>
 
however, that such periods may be shortened upon the written consent of the
- -------
holders of a Majority of the Series F Preferred Stock and 75% of the Series E
Preferred Stock.

          (e) The provisions of this Section 6 are in addition to the
protective provisions of Section 10 hereof.

          Section 7.  Redemption.
                      ---------- 

          (a) Restriction on Redemption and Purchase.  Except as expressly
              --------------------------------------                      
provided in this Section 7, the Company shall not have the right to purchase,
call, redeem or otherwise acquire for value any or all of the Series E Preferred
Stock.

          (b) Optional Redemption.  Subject to the conversion rights set forth
              -------------------                                             
in Section 9 hereof, the Company may, at any time, at its option, redeem all,
but not less than all, of the Series E Preferred Stock at the Optional
Redemption Price hereinafter specified; provided, however, that the Company
                                        --------  -------                  
shall not redeem Series E Preferred Stock or give notice of any redemption
unless the Company has sufficient and lawful funds to redeem the outstanding
Series E Preferred Stock to then be called for redemption.  The date on which
the Series E Preferred Stock is to be redeemed pursuant to this Section 7(b) is
herein called the "Redemption Date."
                   ---------------  

          (c) Redemption Price.  The Optional Redemption Price of the Series E
              ----------------                                                
Preferred Stock (the "Optional Redemption Price") shall be an amount per share
                      -------------------------                               
equal to $400.00 (appropriately adjusted for subdivision or combinations of the
Series E Preferred Stock).  The Redemption Price shall be paid in cash.

          (d) Redemption Notice.  The Company shall, not less than thirty (30)
              -----------------                                               
days nor more than sixty (60) days prior to the Redemption Date, give written
notice ("Redemption Notice"), to each holder of record of Series E Preferred
         -----------------                                                  
Stock to be redeemed.  The Redemption Notice shall state:

               (1) That all of the shares of Series E Preferred Stock are being
          redeemed;

               (2) The number of shares of Series E Preferred Stock held by the
          holder which the Company intends to redeem;

               (3) The Redemption Date and Redemption Price;

               (4) That the holder's right to convert the Series E Preferred
          Stock will terminate on the Redemption Date; and

               (5) The time, place and manner in which the holder is to
          surrender to the Company the certificate or certificates representing
          the shares of Series E Preferred Stock to be redeemed.

          (e) Payment of Redemption Price and Surrender of Stock.  On the
              --------------------------------------------------         
Redemption Date, the Redemption Price of the Series E Preferred Stock scheduled
to be redeemed or called for redemption shall be payable to the holders of the
Series E Preferred Stock.  On or before the Redemption Date, each holder of
Series E Preferred 

                                      -6-
<PAGE>
 
Stock to be redeemed, unless the holder has exercised his right to convert the
shares as provided in Section 9 hereof, shall surrender the certificate or
certificates representing such shares to the Company, in the manner and at the
place designated in the Redemption Notice, and thereupon the Redemption Price
for such shares shall be payable to the order of the person whose name appears
on such certificate or certificates as the owner thereof, and each surrendered
certificate shall be canceled and retired.

          (f) Termination of Rights.  If the Redemption Notice is duly given,
              ---------------------                                          
and if at least ten (10) days prior to the Redemption Date the Redemption Price
is either paid or made available for payment through the arrangement specified
in subsection (g) below, then notwithstanding that the certificates evidencing
any of the shares of Series E Preferred Stock so called or scheduled for
redemption have not been surrendered, all rights with respect to such shares
shall forthwith after the Redemption Date cease and terminate, except only (i)
the right of the holders to receive the Redemption Price without interest upon
surrender of their certificates therefor or (ii) the right to receive Common
Stock upon exercise of the conversion rights provided in Section 9 hereof on or
before the Redemption Date.

          (g) Deposit of Funds.  At least ten (10) days prior to the Redemption
              ----------------                                                 
Date, the Company shall deposit with any bank or trust company in San Diego,
California, having a capital and surplus of at least $100,000,000 as a trust
fund, cash in an amount equal to the aggregate Redemption Price of all shares of
the Series E Preferred Stock scheduled to be redeemed or called for redemption
and not yet redeemed, with irrevocable instructions and authority to the bank or
trust company to pay, on or after the Redemption Date or prior thereto, the
Redemption Price to the respective holders upon the surrender of their share
certificates.  The deposit shall constitute full payment of the shares to their
holders, and from and after the date of such deposit (even if prior to the
Redemption Date), the shares shall be deemed to be redeemed and no longer
outstanding, and the holders thereof shall cease to be shareholders with respect
to such shares and shall have no rights with respect thereto, except the right
to receive from the bank or trust company payment of the Redemption Price of the
shares, without interest, upon surrender of their certificates therefor and, on
or before the Redemption Date, the right to convert such shares and receive
accrued and unpaid dividends as provided in Section 9 hereof. Any monies or
securities so deposited and unclaimed at the end of one year from the Redemption
Date shall be released or repaid to the Company, after which the holders of
shares called for redemption shall be entitled to receive payment of the
Redemption Price only from the Company.

          Section 8.  Voting Rights.  Except as may otherwise be required by law
                      -------------                                             
or as set forth in Section 10 hereof, the Series E Preferred Stock shall have no
voting rights.

          Section 9.  Conversion.  The holders of Series E Preferred Stock shall
                      ----------                                                
have the following conversion rights (subject to the termination of such rights,
if not exercised, on the Redemption Date as set forth in Section 7(d)(4)
hereof):

          (a) Right to Convert.  Each share of Series E Preferred Stock shall be
              ----------------                                                  
convertible, at any time at the option of the holder thereof, into fully paid
and nonassessable shares of Common Stock.

          (b) Conversion Price.  The Series E Preferred Stock shall be
              ----------------                                        
convertible into the number of shares of Common Stock which results from
dividing the 

                                      -7-
<PAGE>
 
Conversion Price (as hereinafter defined) in effect at the time of conversion
into $100.00 (appropriately adjusted for subdivisions or combinations of the
Series E Preferred Stock) for each share of Series E Preferred Stock being
converted. The Conversion Price shall, subject to adjustment from time to time
as provided below, be $1.25 (appropriately adjusted for subdivisions and
combinations of shares of Common Stock and dividends on Common Stock payable in
shares of Common Stock) (the "Conversion Price").
                              ----------------   

          (c) Mechanics of Conversion.  Each holder of Series E Preferred Stock
              -----------------------                                          
who desires to convert the same into shares of Common Stock shall surrender the
certificate or certificates therefor, duly endorsed, at the office of the
Company or of any transfer agent for the Series E Preferred Stock or Common
Stock, and shall give written notice to the Company at such office that such
holder elects to convert the same and shall state therein the number of shares
of Series E Preferred Stock being converted.  Thereupon the Company shall
promptly issue and deliver to such holder a certificate or certificates for the
number of shares of Common Stock to which such holder is entitled.  Such
conversion shall be deemed to have been made immediately prior to the close of
business on the date of such surrender (the "Surrender Date") of the certificate
                                             --------------                     
representing the shares of Series E Preferred Stock to be converted, and the
person entitled to receive the shares of Common Stock issuable upon such
conversion shall be treated for all purposes as the record holder of such shares
of Common Stock on the Surrender Date.

          (d) Adjustment of Conversion Price.
              ------------------------------ 

                    (i) Certain Definitions.  As used in this Section 9, the
                        -------------------                                 
following terms have the following respective meanings:

          (A) Options:  Rights, options or warrants to subscribe for, purchase
              -------                                                         
or otherwise acquire either Common Stock or Convertible Securities;

          (B) Convertible Securities:  Any evidences of indebtedness, shares of
              ----------------------                                           
stock (other than Series D Preferred Stock, Series E Preferred Stock, Series F
Preferred Stock or Common Stock) or other securities directly or indirectly
convertible into or exchangeable for Common Stock;

          (C) Issue; Issued: With respect to any security (including Options),
              -------------                                                   
the grant, issue, sale or assumption thereof, as the case may be; and

          (D) Additional Shares of Common Stock:
              --------------------------------- 

          (1) Series E Conversion.  For purposes of adjusting the Conversion
              -------------------                                           
Price, Additional Shares of Common Stock are all shares (including reissued
shares) of Common Stock Issued (or, pursuant to paragraph (d)(ii) of this
Section 9, deemed to be Issued) by the Company after the effective date of this
Certificate, without consideration or for a consideration (determined pursuant
to paragraph (d)(iv) of this Section 9) per share less than the Conversion Price
in effect on the date of and immediately prior to such Issue, whether or not
subsequently reacquired or retired by the Company, other than:

                                      -8-
<PAGE>
 
          (aa) shares of Common Stock issued upon the conversion of Series D
Preferred Stock, Series E Preferred Stock or Series F Preferred Stock;

          (bb) up to 1,000,000 shares of Common Stock to be issued to officers,
employees, consultants, promotional representatives or directors; whether
pursuant to stock options, employee stock purchase agreements or direct purchase
arrangements (in addition to those set forth in subparagraph (cc) below);

          (cc) up to 4,743,558 shares of Common Stock to be issued pursuant to
warrants and options and stock option plans which are outstanding or reserved
for issuance on the effective date of this Certificate of Designations,
including without limitation under the Company's 1989 Stock Option Plan, 1992
Stock Option Plan, 1996 Non-Employee Directors' Stock Option Plan, Employee
Stock Purchase Plan, options granted outside the above referenced plans and the
Company's publicly traded redeemable warrants; and

          (dd) shares of Common Stock issued as payment of accrued cumulative
dividends on the Series D Preferred Stock or Series F Preferred Stock.

          (2) Adjustment.  In the event of any increase or decrease after the
              ----------                                                     
effective date of this Certificate in the Conversion Price resulting from a
Common Stock split, Common Stock dividend or Common Stock subdivision or
combination, as-described in paragraph (d)(ii)(B) or (d)(v) of this Section 9,
the remaining number of shares permitted to be issued without being considered
Additional Shares of Common Stock pursuant to clauses (bb) and (cc) of paragraph
(d)(i)(D)(1) above shall be increased or decreased appropriately to reflect such
Common Stock split, Common Stock dividend or Common Stock subdivision or
combination.  In addition, in the event that the Company shall repurchase any
shares of Common Stock originally issued to an officer, director, promotional
representative or employee of, or consultant to, the Company, the reissuance of
such shares by the Company to another officer, director, promotional
representative or employee of, or consultant to, the Company, at a price at
least equal to the price at which they were repurchased, shall not be deemed to
be the Issue of Additional Shares of Common Stock and shall not reduce the
number of shares which may be issued pursuant to clause (bb) or (cc) of
paragraph (d)(i)(D)(1) hereof.

                    (ii) Issue of Securities Deemed Issue of Additional Shares
                         -----------------------------------------------------
of Common Stock.
- --------------- 

          (A) Options and Convertible Securities.  In case the Company shall
              ----------------------------------                            
Issue any Options or Convertible Securities, or shall fix a record date for the
determination of holders of any class of securities entitled to receive any such
Options or Convertible Securities, then the maximum number of shares (as set
forth in the instrument relating thereto without regard to the provisions
contained therein for a subsequent adjustment of such number) of Common Stock
issuable upon the exercise of such Options, or, in the case of Convertible
Securities and Options therefor, the conversion or exchange of such Convertible
Securities, shall be deemed to be Additional Shares of Common Stock Issued as of
the time of such Issue or, in the case such a record 

                                      -9-
<PAGE>
 
date shall have been fixed, as of the close of business on such record date;
provided, however, that Additional Shares of Common Stock shall not be deemed to
- --------  -------
have been Issued for purposes of adjusting the Conversion Price unless the
consideration per share (determined pursuant to paragraph (d)(iv) of this
Section 9) of such Additional Shares of Common Stock would be less than the
Conversion Price in effect on the date of and immediately prior to such Issue,
or such record date, as the case may be. In any such case in which Additional
Shares of Common Stock are deemed to be Issued:

          (1) no further adjustment of the Conversion Price shall be made upon
the subsequent Issue of Convertible securities or shares of Common Stock upon
the exercise of such Options or the conversion or exchange of such Convertible
Securities;

          (2) if such Options or Convertible Securities by their terms provide,
with the passage of time or otherwise, for any increase or decrease in the
number of shares of Common Stock Issuable, upon the exercise, conversion or
exchange thereof (by change of rate or otherwise), the Conversion Price computed
upon the original Issue thereof (or upon the occurrence of a record date with
respect thereto), and any subsequent adjustments thereon, shall, upon any such
increase or decrease becoming effective, be recomputed to reflect such increase
or decrease insofar as it affects such Options, or the rights of conversion or
exchange under such Convertible Securities, which are outstanding at such time;

          (3) upon the expiration of any such Options or any rights of
conversion or exchange under such Convertible Securities which shall not have
been exercised, the Conversion Price computed upon the original Issue thereof
(or upon the occurrence of a record date with respect thereto), and any
subsequent adjustments thereon, shall, upon such expiration, be recomputed as
if:

          (aa) in the case of Convertible Securities or Options for Common
Stock, the only Additional Shares of Common Stock Issued were the shares of
Common Stock, if any, actually Issued upon the exercise of such Options or the
conversion or exchange of such Convertible Securities and the consideration
received therefor was the consideration actually received by the Company upon
such exercise, or for the Issue of all such Convertible Securities which were
actually converted or exchanged, plus the additional consideration, if any,
actually received by the Company upon such conversion or exchange, and

          (bb) in the case of Options for Convertible Securities, only the
Convertible Securities, if any, actually Issued upon the exercise thereof were
Issued at the time of the Issue of such Options, and the consideration received
therefor was the consideration actually received by the Company (determined
pursuant to paragraph (d)(iv) of this Section 9) upon the Issue of the
Convertible Securities with respect to which such Options were actually
exercised;

          (4) no readjustment pursuant to clause (2) or (3) above shall have the
effect of increasing the Conversion Price by an amount in excess of the amount
of the adjustment thereof originally made in respect of the Issue of such
Options or Convertible Securities; and

                                      -10-
<PAGE>
 
          (5) in the case of any Options which expire by their terms not more
than 30 days after the date of Issue thereof, no adjustment of the Conversion
Price shall be made until the expiration or exercise of all such Options,
whereupon such adjustment shall be made in the manner provided in clause (3)
above.

          (B) Stock Splits; Stock Dividends.  In case the Company at any time or
              -----------------------------                                     
from time to time after the effective date of this Certificate shall declare or
pay any dividend on the Common Stock payable in Common Stock, or effect a
subdivision of the outstanding shares of Common Stock into a greater number of
shares of Common Stock, Additional Shares of Common Stock shall not be deemed to
have been Issued as a result thereof; provided, however, that if the Company
                                      --------  -------                     
shall at any time or from time to time after the effective date hereof effect a
subdivision of the outstanding Common Stock (and not effect a corresponding
subdivision of  the Series E Preferred Stock) the Conversion Price then in
effect immediately before that subdivision shall be proportionately decreased;
and provided, further, that if the Company at any time or from time to time
    --------  -------                                                      
after the effective date hereof shall make or issue, or fix a record date for
the determination of holders of Common Stock entitled to receive, a dividend or
other distribution payable in shares of Common Stock, then and in each such
event the Conversion Price then in effect shall be decreased as of the time of
such issuance or, in the event such a record date shall have been fixed, as of
the close of business on such record date, by multiplying the Conversion Price
for the Series E  Preferred Stock then in effect by a fraction:

          (1) the numerator of which shall be the total number of shares of
Common Stock issued and outstanding immediately prior to the time of such
issuance or the close of business on such record date, and

          (2) the denominator of which shall be the total number of shares of
Common Stock issued and outstanding immediately prior to the time of such
issuance or the close of business on such record date plus the number of shares
of Common Stock issuable in payment of such dividend or distribution.


          (iii) Adjustment of Conversion Price. In case the company shall
                ------------------------------
Company shall Issue Additional Shares of Common Stock (including Additional
Shares of Common Stock deemed to be Issued pursuant to paragraph (d)(ii) of this
Section 9) then for purposes of adjusting the Conversion Price and in each such
case, the Conversion Price in effect on the date of and immediately prior to
such Issue shall be reduced, concurrently with such Issue, to a price
(calculated to the nearest cent) determined by multiplying such Conversion Price
by a fraction

          (x) the numerator of which shall be the number of shares of Common
     Stock outstanding immediately prior to such Issue (including the number of
     shares of Common Stock issuable prior to such adjustment upon conversion of
     all outstanding shares of Series D Preferred Stock, Series E Preferred
     Stock and Series F Preferred Stock) plus the number of shares of Common
     Stock which the aggregate consideration received by the-Company for the
     total number of such Additional Shares of Common Stock so Issued would
     purchase at such Conversion Price, and


                                      -11-
<PAGE>
 
          (y) the denominator of which shall be the number of shares of Common
     Stock outstanding immediately prior to such Issue (including the number of
     shares of Common Stock issuable prior to such adjustment upon conversion of
     all outstanding shares of Series D Preferred Stock, Series E Preferred
     Stock and Series F Preferred Stock) plus the number of such Additional
     Shares of Common stock so Issued,
 
provided, however,  that the Conversion Price shall not be so reduced at such
- --------  -------                                                            
time if the amount of any such reduction would be an amount less than $0.05, but
any such amount shall be carried forward and reduction with respect thereto made
at the time of and together with any other subsequent reduction which, together
with such amount and any other amount or amounts so carried forward, shall
aggregate $0.05 or more. For the purposes of this paragraph (d)(iii),
immediately after any Additional Shares of Common Stock are deemed Issued
pursuant to paragraph (d)(ii) of this Section 5, such Additional Shares of
Common Stock shall be deemed to be outstanding (subject to adjustment as
provided in such paragraph (d)(ii)) as shares of Common Stock.

          (iv) Computation of Consideration.  For the purposes of this paragraph
               ----------------------------                                     
(d), the consideration received by the Company for the Issue of any Additional
Shares of Common Stock shall be computed as follows:

                         (A) Nature of Consideration.  Such consideration shall,
                             -----------------------                            

          (1) insofar as it consists of cash, be computed at the gross amount of
cash received by the Company, excluding amounts paid or payable for accrued
interest or accrued dividends, without deducting expenses paid or incurred by
the Company in good faith and commissions and compensation paid and concessions
and discounts allowed in good faith to underwriters, dealers or others
performing similar services in connection with such Issue, other than expenses
in excess of 15% of such gross amount of cash;

          (2) insofar as it consists of property other than cash, be computed at
the fair market value thereof at the time of such Issue, without deducting
expenses, commissions, compensation, concessions or discounts, as determined and
paid in good faith by the Board of Directors; provided, however, that no value
                                              --------  -------               
shall be attributed to any services performed by any employee, officer or
director of the Company; and

          (3) in case Additional Shares of Common Stock are Issued together with
other stock or securities or other assets of the Company for consideration which
covers both, be the proportion of such consideration received with respect to
the Additional Shares of Common Stock, computed as provided in clauses (1) and
(2) above, as determined in good faith by the Board of Directors.

                         (B) Options and Convertible Securities. The 
                             ----------------------------------
consideration per share received by the Company for Additional Shares of Common
Stock deemed to have been Issued pursuant to subdivision (A) of paragraph
(d)(ii) of this Section 9, relating to Options and Convertible Securities, shall
be determined by dividing

                                      -12-
<PAGE>
 
          (x) the total amount, if any, received or receivable by the Company as
     consideration for the Issue of such Options or Convertible Securities, plus
     the aggregate amount of additional consideration payable to the Company
     upon the exercise of such Options or the conversion or exchange of such
     Convertible Securities or, in the case of Options for Convertible
     Securities, the exercise of such Options for Convertible Securities and the
     conversion or exchange of such Convertible Securities,

                         by

          (y) the number of shares of Common Stock issuable upon the exercise of
     such Options or the conversion or exchange of such Convertible Securities.

          (v) Adjustments for Combinations. etc.  In case at any time after the
              ---------------------------------                                
effective date of this Certificate the outstanding shares of Common Stock shall
be combined or consolidated, by reclassification or otherwise, into a lesser
number of shares of Common Stock, the Conversion Price in effect immediately
prior to such combination or consolidation shall, concurrently with the
effectiveness of such combination or consolidation, be proportionately
increased.

          (e) Certificate of Adjustment.  In each case of an adjustment or
              -------------------------                                   
readjustment of the Conversion Price or the number of shares of Common Stock or
other securities issuable upon conversion of the Series E Preferred Stock, the
Company shall cause its chief financial officer to compute such adjustment or
readjustment in accordance with the provisions hereof and prepare a certificate
showing such adjustment or readjustment, and shall mail such certificate, by
first class mail, postage prepaid, to each registered holder of the Series E
Preferred Stock at the holder's address as shown in the Company's books.  The
certificate shall set forth such adjustment or readjustment, showing in
reasonable detail the facts upon which such adjustment or readjustment is based.

          (f) Notices of Record Date.  In the event of (i) any taking by the
              ----------------------                                        
Company of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend or
other distribution, or (ii) any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company, any
merger or consolidation of the Company with or into any other corporation (other
than a merger of a wholly owned subsidiary into the Company), or any transfer of
all or substantially all of the assets of the Company to any other person or any
voluntary or involuntary dissolution, liquidation or winding up of the Company,
the Company shall mail to each holder of Series E Preferred Stock at least
thirty (30) days prior to the record date specified therein, a notice specifying
(1) the date on which any such record is to be taken for the purpose of such
dividend or distribution and a description of such dividend or distribution, (2)
the date on which any such reorganization, reclassification, transfer,
consolidation, merger, dissolution, liquidation or winding up is expected to
become effective, and (3) the date, if any, that is to be fixed, as to when the
holders of record of Common Stock (or other securities) shall be entitled to
exchange their shares of Common Stock (or other securities) for securities or
other property deliverable upon such reorganization, reclassification, transfer,
consolidation, merger, dissolution, liquidation or winding up.

                                      -13-
<PAGE>
 
          (g)  Automatic Conversion.
               -------------------- 

          (1) Each share of Series E Preferred Stock shall automatically be
converted into shares of Common Stock based on the then effective Conversion
Price (A) immediately upon the closing after the Commitment Date of an
underwritten public offering pursuant to an effective registration statement
under the Securities Act of 1933, as amended, covering the offering and sale of
Common Stock for the account of the Company in which the public offering price
equals or exceeds $7.50 per share of Common Stock (appropriately adjusted for
subdivisions and combinations of shares of Common Stock and dividends on Common
Stock payable in shares of Common Stock), the minimum offering is for at least
$15 million and the obligation of the underwriters with respect to which is that
if any of the securities being offered are purchased, all such securities must
be purchased, or (B) upon the receipt by the Company of a written notice from
the holders that the number of shares of the Series E Preferred Stock
representing more than 75% of the outstanding Series E Preferred Stock electing
unconditionally to convert such shares of Series E Preferred Stock.

          (2) Upon the occurrence of any of the events specified in paragraph
(1) above the outstanding shares of Series E Preferred Stock shall be converted
automatically without any further action by the holders of such shares and
whether or not the certificates representing such shares are surrendered to the
Company or its transfer agent; provided, however, that the Company (i) shall
                               --------  -------                            
notify all the holders of Series E Preferred Stock that were not a party to the
written notice specified in paragraph (1) above that their shares will be
automatically converted, and (ii) shall not be obligated to issue certificates
evidencing the shares of Common Stock issuable upon such conversion unless the
certificates evidencing such shares of Series E Preferred Stock are either
delivered to the Company or its transfer agent as provided below, or the holder
notifies the Company or its transfer agent that such certificates have been
lost, stolen or destroyed and executes an agreement satisfactory to the Company
to indemnify the Company from any loss incurred by it in connection with such
certificates.  Upon the occurrence of such automatic conversion of the Series E
Preferred Stock, the holders of Series E Preferred Stock shall surrender the
certificates representing such shares at the office of the Company or any
transfer agent for the Series E Preferred Stock or Common Stock.  Thereupon,
there shall be issued and delivered to such holder promptly at such office and
in its name as shown on such surrendered certificate or certificates, a
certificate or certificates for the number of shares of Common Stock into which
the shares of Series E Preferred Stock surrendered were convertible on the date
on which such automatic conversion occurred.

          (h) Fractional Shares.  No fractional shares of Common Stock shall be
              -----------------                                                
issued upon conversion of Series E Preferred Stock.  In lieu of any fractional
share to which the holder would otherwise be entitled, the Company shall pay
cash equal to the product of such fraction multiplied by the Common Stock Value
on the date of conversion.

          (i) Reservation of Stock Issuable Upon Conversion.  The Company shall
              ---------------------------------------------                    
at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Series E Preferred Stock, such number of its shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Series E Preferred Stock; and if at any time the
number of authorized but unissued shares of 

                                      -14-
<PAGE>
 
Common Stock shall not be sufficient to effect the conversion of all then
outstanding shares of the Series E Preferred Stock, the Company will take such
corporate action as may, in the opinion of its counsel, be necessary to increase
its authorized but unissued shares of Common Stock to such number of shares as
shall be sufficient for such purpose.

          (j) Notices.  Any notice required or permitted by this Section 9 or
              -------                                                        
any other provision of this Certificate of Designation to be given to a holder
of Series E Preferred Stock or to the Company shall be in writing and be deemed
given upon the earlier of actual receipt or three (3) days after the same has
been deposited in the United States mail, by certified or registered mail,
return receipt requested, postage prepaid, and addressed (i) to each holder of
record at the address of such holder appearing on the books of the Company, or
(ii) to the Company at 10655 Sorrento Valley Road, San Diego, California 92121,
or (iii) to the Company or any holder, at any other address specified in a
written notice given to the other for the giving of notice.

          (k) Payment of Taxes.  The Company will pay all taxes (other than
              ----------------                                             
taxes based upon income) and other governmental charges that may be imposed with
respect to the issue or delivery of shares of Common Stock upon conversion of
shares of Series E Preferred Stock, including without limitation any tax or
other charge imposed in connection with any transfer involved in the issue and
delivery of shares of Common Stock in a name other than that in which the shares
of Series E Preferred Stock so converted were registered.

          (l) No Dilution or Impairment.  The Company shall not amend its
              -------------------------                                  
Certificate of Incorporation or participate in any reorganization, transfer of
assets, consolidation, merger, dissolution, issue or sale of securities or any
other voluntary action, for the purpose of avoiding or seeking to avoid the
observance or performance of any of the terms to be observed or performed
hereunder by the Company, but will at all times in good faith assist in carrying
out all such action as may be reasonably necessary or appropriate in order to
protect the conversion rights of the holders of the Series E Preferred Stock
against dilution or other impairment.

          (m)  Validity of Conversion Shares.  The Corporation agrees that it
               -----------------------------                                 
will from time to time take all such actions as may be necessary to assure that
all shares of Common Stock which may be issued upon conversion of any share of
Series E Preferred Stock will, upon issuance, be legally and validly issued,
fully paid and nonassessable and free from all liens and charges with respect to
the issue thereof (other than liens imposed by the holders of such shares); and,
without limiting the generality of the foregoing, the Corporation agrees that it
will from time to time take all such action as may be necessary to assure that
the par value per share, if any, of the Common Stock is at all times equal to or
less than that which would be required to maintain the status of the Common
Stock as fully paid without additional payment from the holders of the Series E
Preferred Stock.

          Section 10.  Restrictions and Limitations.  So long as any shares of
                       ----------------------------                           
Series E Preferred Stock remain outstanding, the Company shall not, and shall
not permit any Subsidiary to, without the vote or written consent by the holders
of at least 75% of the Series E Preferred Stock:

               (a) Increase or decrease the aggregate number of authorized
shares of Series E Preferred Stock;

                                      -15-
<PAGE>
 
               (b) Increase or decrease the par value of the Series E Preferred
Stock;

               (c) Alter or change the powers, preferences or special rights of
the Series E Preferred Stock so as to affect them adversely; or

               (d) authorize, create or issue any new class or series of capital
stock or any other securities convertible into equity securities of the Company
(other than Common Stock) having a preference over, or being on a parity with,
the Series E Preferred Stock with respect to voting, dividends, redemption,
liquidation or dissolution of the Company other than the Series D Preferred
Stock and the Series F Preferred Stock outstanding on the date hereof.

          Section 11.  No Reissuance of Series E Preferred Stock.  No share or
                       -----------------------------------------              
shares of Series E Preferred Stock acquired by the Company by reason of
redemption, purchase, conversion or otherwise shall be reissued, and all such
shares shall be canceled, retired and shall thereafter revert to authorized but
unissued blank check preferred of the Company.

                                      -16-
<PAGE>
 
          IN WITNESS WHEREOF, Protein Polymer Technologies, Inc. has caused this
Certificate to be signed and attested by its duly authorized officers this ____
day of _________, 1998.


                         PROTEIN POLYMER TECHNOLOGIES, INC.



                         By:
                              _____________________________
                              J. Thomas Parmeter, President


Attest:


By:
   __________________________
   Philip J. Davis, Secretary

                                      -17-

<PAGE>
 
                                                                   EXHIBIT 3.1.2


                           CERTIFICATE OF DESIGNATION
                           --------------------------

                                       OF
                                       --

                            SERIES F PREFERRED STOCK
                            ------------------------

                                       OF
                                       --

                       PROTEIN POLYMER TECHNOLOGIES, INC.
                       ----------------------------------

                           (Pursuant to Section 151)

          The undersigned, J. Thomas Parmeter and Philip J. Davis, the President
and Secretary, respectively, of PROTEIN POLYMER TECHNOLOGIES, INC., a
                                ----------------------------------   
corporation organized and existing under and by virtue of the General
Corporation Law of the State of Delaware (the "Corporation"), do hereby certify,
                                               -----------                      
in the name of and on behalf of the Corporation, and as its corporate act, that
in accordance with the Corporation's Bylaws, at a meeting of the Board of
Directors of the Corporation held on March 27, 1998, the Board adopted the
following preamble and resolution:

               Whereas the Certificate of Incorporation of the Corporation
               -------                                                    
          provides for a class of shares of stock designated "Preferred Stock,"
          issuable from time to time in one or more series, and vests in the
          Board of Directors of the Corporation the authority to fix the
          designations and the powers, preferences and rights, and the
          qualifications, limitations or restrictions thereof, and to fix the
          number of shares constituting any such series:

          NOW, THEREFORE, BE IT

               RESOLVED that there shall be a series of Preferred Stock of the
               --------                                                       
          Corporation to be designated as follows and that the powers,
          preferences and relative, participating, optional or other rights of
          the shares of such series of Preferred Stock and the qualifications,
          limitations and restrictions thereof shall be as follows:

          Section 1.  Designation.  There is hereby provided a series of
                      -----------                                       
Preferred Stock designated the Series F 10% Cumulative Convertible Preferred
Stock (the "Series F Preferred Stock").
            ------------------------   

          Section 2.  Number.  The number of shares constituting the Series F
                      ------                                                 
Preferred Stock is fixed at twenty seven thousand three hundred seventeen
(27,317) shares.

          Section 3.  Definitions.  For purposes of this Certificate of
                      -----------                                      
Designation the following definitions shall apply:
<PAGE>
 
               "Board" shall mean the Board of Directors of the Company.
                -----                                                   

               "Commitment Date" shall mean September 13, 1995.
                ---------------                                

               "Company" shall mean this corporation.
                -------                              

               "Common Stock" shall mean the Common Stock, par value $0.01, of
                ------------                                                  
the Company.

          "Common Stock Value" shall mean, as of any given date, (i) if the
           ------------------                                              
Common Stock is traded on a national securities exchange, or is designated as a
National Market System security on NASDAQ, the closing price thereof as reported
on such exchange or NASDAQ-NMS, as the case may be, (ii) if the Common Stock is
actively traded over-the-counter (other than NASDAQ-NMS), the average of the low
bid and high asked prices therefor, as reported by the National Association of
Securities Dealers Automated Quotation system or other source, (iii) if the
Common Stock is not traded on an exchange, NASDAQ-NMS, or actively traded over-
the-counter, the fair market value thereof, as determined in good faith by the
Board.

               "Junior Stock" shall mean the Common Stock of the Company,
                ------------                                             
whether presently outstanding or hereafter issued.

               "Majority of the Series F Preferred Stock" shall mean more than
                ----------------------------------------                      
50% of the outstanding Series F Preferred Stock.

               "75% of the Series E Preferred Stock" shall mean at least 75% of
                -----------------------------------                            
the outstanding Series E Preferred Stock.

               "Series D Preferred Stock" shall mean the Company's Series D 10%
                ------------------------                                       
Cumulative Convertible Preferred Stock.

               "Series E Preferred Stock" shall mean the Company's Series E
                ------------------------                                   
Convertible Preferred Stock.

          "Subsidiary" shall mean any corporation a majority of the Voting Stock
           ----------                                                           
of which is, at the time as of which any determination is being made, owned by
the Company either directly or through one or more Subsidiaries.

          "Voting Stock" shall mean any shares having general voting power in
           ------------                                                      
electing the Board of Directors (irrespective of whether or not at the time
stock of any other class or classes has or might have voting power by reason or
the happening of any contingency).  The Common Stock is Voting Stock and the
Series D Preferred Stock, Series E Preferred Stock and Series F Preferred Stock
is not Voting Stock.

          Section 4.  Dividends.
                      --------- 

          (a) Right to Dividends.  The holders of the then outstanding Series F
              ------------------                                               
Preferred Stock shall be entitled to receive, when and as declared by the Board,
and out of any funds legally available therefor, cumulative dividends at the
annual rate of $10.00 per share (appropriately adjusted for subdivisions or
combinations of the Series F Preferred Stock), in addition such dividends shall
include all accrued and unpaid 

                                      -2-
<PAGE>
 
dividends on each share of Series D Preferred Stock which is exchanged for a
share of Series F Preferred Stock. These dividends shall be payable, when and as
declared by the Board, in equal quarterly installments on March 1, June 1,
September 1 and December 1 (or, if such day is not a Business Day, on the
Business Day next thereafter) of each year commencing on June 8, 1998. "Business
                                                                        --------
Day" shall mean any day excluding Saturday, Sunday and any day which shall be in
- ---
the State of California a legal holiday or a day on which banking institutions
are authorized by law to close. The Company at its option may make any dividend
payment on the Series F Preferred Stock in shares of Common Stock or cash, or
both, with each share of Common Stock being valued for this purpose at the
Common Stock Value on the date such dividend is declared or, if the Common Stock
is not issued within ten (10) days after the date of declaration, on the date
such Common Stock is issued. Dividends on the Series F Preferred Stock shall
accumulate and accrue on each such share from the date of its original issue and
shall accrue from day to day thereafter, whether or not earned or declared. Such
dividends shall be cumulative so that if such dividends in respect of any
previous or current quarterly dividend period, at the rate specified above,
shall not have been paid or declared and a sum sufficient for the payment
thereof set apart, the deficiency shall first be fully paid before any dividend
or other distribution shall be paid or declared and set apart for the Common
Stock. Any accumulation of dividends on the Series F Preferred Stock shall not
bear interest.

          (b) Priority.  Unless full dividends on the Series F Preferred Stock
              --------                                                        
for all past dividend periods and the then current dividend period shall have
been paid or declared and a sum sufficient for the payment thereof set apart,
(1) no dividend whatsoever (other than a dividend payable solely in Common Stock
or a dividend on the Series D Preferred Stock) shall be paid or declared, and no
distribution shall be made, on any Junior Stock, and (2) no shares of Junior
Stock shall be purchased, redeemed or acquired by the Company and no monies
shall be paid into or set aside or made available for a sinking fund for the
purchase, redemption or acquisition thereof; provided, however, that this
                                             --------  -------           
restriction shall not apply to the repurchase of shares of Common Stock from
directors or employees of or consultants or advisers to the Company or any
Subsidiary pursuant to agreements under which the Company has the option to
repurchase such shares upon the occurrence of certain events, including without
limitation the termination of employment by or service to the Company or any
Subsidiary.

          (c) Additional Dividends.  After cumulative dividends on the Series F
              --------------------                                             
Preferred Stock for all past dividend periods and the then current dividend
period shall have been declared and paid or set apart, if the Board shall elect
to declare additional dividends, such additional dividends shall be declared in
equal amounts per share on all shares of Series D Preferred Stock, Series E
Preferred Stock, Series F Preferred Stock and Common Stock, but with each share
of Series D Preferred Stock, Series E Preferred Stock and Series F Preferred
Stock being entitled to dividends based upon the number of shares of Common
Stock into which such share of Series D Preferred Stock, Series E Preferred
Stock or Series F Preferred Stock, respectively, could be converted at the
record date for the determination of shareholders entitled to receive such
dividend or, if no such record date is established, on the date such dividend is
declared; provided, however, that the holders of the Series F Preferred Stock
          --------  -------                                                  
shall not be entitled to receive dividends or distributions payable in Common
Stock or other securities by reason of any such dividend or distribution that is
declared or paid on the Common Stock if and to the extent pursuant to Section 9
hereof, (i) such dividend or distribution would result in an adjustment to the
conversion price of the Series F Preferred or (ii) the holders of the 

                                      -3-
<PAGE>
 
Series F Preferred Stock would subsequently be entitled to receive such dividend
or distribution.

          Section 5.  Liquidation Rights of Series F Preferred Stock.
                      ---------------------------------------------- 

          (a) Preference.  In the event of any liquidation, dissolution or
              ----------                                                  
winding up of the Company, whether voluntary or involuntary, the holders of the
Series F Preferred Stock and Series E Preferred Stock then outstanding shall be
entitled to be paid out of the assets of the Company available for distribution
to its shareholders, whether such assets are capital, surplus, or earnings,
before any payment or declaration and setting apart for payment of any amount
shall be made in respect of the Junior Stock, but only after any preference is
paid or set apart for the Series D Preferred Stock, an amount equal to one
hundred dollars ($100.00) per share of Series F Preferred Stock and an amount
equal to one hundred dollars ($100.00) per share of Series E Preferred Stock,
then after such preference is paid with respect to the Series F Preferred Stock
and Series E Preferred Stock, in the case of the Series E Preferred Stock an
amount equal to any declared and unpaid dividends thereon, and in the case of
the Series F Preferred Stock an amount equal to any accrued and unpaid dividends
whether or not declared, and no more. If upon any liquidation, dissolution, or
winding up of the Company, whether voluntary or involuntary, after the
distribution of any preference on the Series D Preferred Stock is paid or set
apart, the assets to be distributed to the holders of the Series E Preferred
Stock and Series F Preferred Stock shall be insufficient to permit the payment
to such shareholders of the full preferential amounts aforesaid, then all of the
remaining assets of the Company to be distributed shall be distributed among the
holders of the Series E Preferred Stock and Series F Preferred Stock ratably in
accordance with their respective liquidation preferences.

          (b) Remaining Assets. After the payment or distribution to the holders
              ----------------                                                  
of the Series D Preferred Stock, the Series E Preferred Stock and the Series F
Preferred Stock  of the full preferential amounts aforesaid, the holders of the
Junior Stock then outstanding shall be entitled to receive ratably all remaining
assets of the Company to be distributed.

          Section 6.  Merger, Consolidation.
                      --------------------- 

               (a)  At any time, in the event of:

          (1) any consolidation or merger of the Company with or into any other
corporation or other entity or person (other than a merger of a wholly owned
subsidiary into the Company), or

                    (2) a sale or other disposition of all or substantially all
of the assets of the Company, then:

          (A)  After the full payments, if any, required to be made to the
holders of the Series D Preferred Stock shall have been made, holders of the
Series E Preferred Stock and Series F Preferred Stock shall receive, for each
share of such stock in cash or in securities (including, without limitation,
debt securities) received from the acquiring corporation, or a combination
thereof, at the closing of any such transaction, an amount equal to $100.00
(appropriately adjusted for subdivisions or combinations of 

                                      -4-
<PAGE>
 
the Series E Preferred Stock or Series F Preferred Stock), then after such
preference is paid with respect to the Series E Preferred Stock and Series F
Preferred Stock, an amount equal to all declared and unpaid dividends on each
share of Series E Preferred Stock and an amount equal to all accrued and unpaid
dividends on each share of Series F Preferred Stock (whether or not earned or
declared, to and including the date full payment shall be tendered to such
holders with respect to such transaction), and no more; provided, however, in
                                                        -----------------
the event of any such transaction, if the amounts available to be distributed to
the holders of the Series E Preferred Stock and Series F Preferred Stock shall
be insufficient to permit the payment to such shareholders of the full amounts
provided for in this Section 6(a)(2)(A), then the amounts to be so distributed
shall be distributed ratably in accordance with their respective preferences;
and

          (B)  after the payment or distribution to the holders of the Series D
Preferred Stock, the holders of the Series F Preferred Stock and to the holders
of the Series E Preferred Stock of the full preferential amounts stated in
Section 6(a)(2)(A) hereof, the remaining proceeds of such transaction shall be
distributed ratably to the holders of Junior Stock then outstanding.

          (b) Any securities or other property to be delivered to the holders of
the Series E Preferred Stock, Series F Preferred Stock or Common Stock pursuant
to Section 6(a) hereof shall be valued as follows:

                    (1) Securities not subject to investment letter or other
similar restrictions on free marketability:

          (A)  If traded on a securities exchange, the value shall be deemed to
be the average of the closing prices of the securities on such exchange over the
30-day period ending three (3) days prior to the closing;

          (B)  If actively traded over-the-counter, the value shall be deemed to
be the average of the closing bid prices over the 30-day period ending three (3)
days prior to the closing; and

          (C)  If there is no active public market, the value shall be the fair
market value thereof, as mutually determined by the Company and the holders of a
Majority of the Series F Preferred Stock and 75% of the Series E Preferred
Stock.

          (2) The method of valuation of securities subject to investment letter
or other restrictions on free marketability shall be to make appropriate
discount from the market value determined as above in paragraph (1)(A), (B) or
(C) to reflect the approximate fair market value thereof, as mutually determined
by the Company and the holders of a Majority of the Series F Preferred Stock and
75% of the Series E Preferred Stock.

          (3) All other securities or other property shall be valued at the fair
market value thereof, as mutually determined by the Company and the holders of a
Majority of the Series F Preferred Stock and 75% of the Series E Preferred
Stock.

                                      -5-
<PAGE>
 
          (4) If the holders of a Majority of the Series F Preferred Stock, 75%
of the Series E Preferred Stock and the Company are unable to reach agreement on
any valuation matter, such valuation shall be submitted to and determined by a
nationally recognized independent investment banking firm selected by the Board,
75% of the Series E Preferred Stock and a Majority of the Series F Preferred
Stock (or, if such selection cannot be made, by a nationally recognized
independent investment banking firm selected by the American Arbitration
Association in accordance with its rules).

               (c) In the event the requirements of Section 6(a) hereof are not
complied with, the Company shall forthwith either:

                    (1) Cause such closing to be postponed until such time as
the requirements of this Section 6 have been complied with; or

          (2) Cancel such transaction, in which event the rights, preferences
and privileges of the holders of the Series E Preferred Stock and Series F
Preferred Stock shall revert to and be the same as such rights, preferences and
privileges existing immediately prior to the date of the first notice referred
to in Section 6(d) hereof.

          (d) The Company shall give each holder of record of Series E Preferred
Stock and Series F Preferred Stock written notice of such impending transaction
not later than thirty (30) days prior to the shareholders' meeting called to
approve such transaction, or thirty (30) days prior to the closing of such
transaction, whichever is earlier, and shall also notify such holders in writing
of the final approval of such transaction.  The first of such notices shall
describe the material terms and conditions of the impending transaction and the
provisions of this Section 6, and the Company shall thereafter give such holders
prompt notice of any material changes.  The transaction shall in no event take
place sooner than thirty (30) days after the Company has given the first notice
provided for herein or sooner than ten (10) days after the Company has given
notice of any material changes provided for herein; provided, however, that such
                                                    --------  -------           
periods may be shortened upon the written consent of the holders of a Majority
of the Series F Preferred Stock and 75% of the Series E Preferred Stock.

               (e) The provisions of this Section 6 are in addition to the
protective provisions of Section 10 hereof.

          Section 7.  Redemption.
                      ---------- 

          (a) Restriction on Redemption and Purchase.  Except as expressly
              --------------------------------------                      
provided in this Section 7, the Company shall not have the right to purchase,
call, redeem or otherwise acquire for value any or all of the Series F Preferred
Stock.

          (b) Optional Redemption.  On, or at any time after, the fourth
              -------------------                                       
anniversary of the Commitment Date, the Company may, at its option, redeem the
Series F Preferred Stock in whole or in part, at the Optional Redemption Price
hereinafter specified; provided, however, that the Company shall not redeem
Series F Preferred Stock or give notice of any redemption unless the Company has
sufficient and lawful funds to redeem the outstanding Series F Preferred Stock
to then be called for 

                                      -6-
<PAGE>
 
redemption. The date on which the Series F Preferred Stock is to be redeemed
pursuant to this Section 7(b) is herein called the "Redemption Date." If fewer
                                                    ---------------
than all of the then-outstanding shares of Series F Preferred Stock are to be
redeemed, such redemption will be made ratably among all holders of Series F
Preferred Stock in proportion to the respective number of shares held thereby.

          (c) Redemption Price.  The Optional Redemption Price of the Series F
              ----------------                                                
Preferred Stock (the "Optional Redemption Price") shall be an amount per share
                      -------------------------                               
equal to $100.00 plus all accrued and unpaid dividends thereon, whether or not
earned or declared, to and including the Redemption Date.  The Redemption Price
may be paid, at the Company's discretion, in cash, shares of Common Stock
(valued at the Common Stock Value on the Redemption Date) or any combination
thereof.

          (d) Redemption Notice.  The Company shall, not less than thirty (30)
              -----------------                                               
days nor more than sixty (60) days prior to the Redemption Date, give written
notice ("Redemption Notice"), to each holder of record of Series F Preferred
         -----------------                                                  
Stock to be redeemed.  The Redemption Notice shall state:

               (1) That total number of the shares of Series F Preferred Stock
          being redeemed;

               (2) The number of shares of Series F Preferred Stock held by the
          holder which the Company intends to redeem;

               (3) The Redemption Date and Redemption Price;

               (4) That the holder's right to convert the Series F Preferred
          Stock will terminate on the Redemption Date; and

     (5)       The time, place and manner in which the holder is to surrender to
               the Company the certificate or certificates representing the
               shares of Series F Preferred Stock to be redeemed.

          (e) Payment of Redemption Price and Surrender of Stock.  On the
              --------------------------------------------------         
Redemption Date, the Redemption Price of the Series F Preferred Stock scheduled
to be redeemed or called for redemption shall be payable to the holders of the
Series F Preferred Stock.  On or before the Redemption Date, each holder of
Series F Preferred Stock to be redeemed, unless the holder has exercised his
right to convert the shares as provided in Section 9 hereof, shall surrender the
certificate or certificates representing such shares to the Company, in the
manner and at the place designated in the Redemption Notice, and thereupon the
Redemption Price for such shares shall be payable to the order of the person
whose name appears on such certificate or certificates as the owner thereof, and
each surrendered certificate shall be canceled and retired.

          (f) Termination of Rights.  If the Redemption Notice is duly given,
              ---------------------                                          
and if at least ten (10) days prior to the Redemption Date the Redemption Price
is either paid or made available for payment through the arrangement specified
in subsection (g) below, then notwithstanding that the certificates evidencing
any of the 

                                      -7-
<PAGE>
 
shares of Series F Preferred Stock so called or scheduled for redemption have
not been surrendered, all rights with respect to such shares shall forthwith
after the Redemption Date cease and terminate, except only (i) the right of the
holders to receive the Redemption Price without interest upon surrender of their
certificates therefor or (ii) the right to receive Common Stock plus dividends
upon exercise of the conversion rights provided in Section 9 hereof on or before
the Redemption Date.

          (g) Deposit of Funds.  At least ten (10) days prior to the Redemption
              ----------------                                                 
Date, the Company shall deposit with any bank or trust company in San Diego,
California, having a capital and surplus of at least $100,000,000 as a trust
fund, cash or shares of Common Stock in an amount equal to the aggregate
Redemption Price of all shares of the Series F Preferred Stock scheduled to be
redeemed or called for redemption and not yet redeemed, with irrevocable
instructions and authority to the bank or trust company to pay, on or after the
Redemption Date or prior thereto, the Redemption Price to the respective holders
upon the surrender of their share certificates. The deposit shall constitute
full payment of the shares to their holders, and from and after the date of such
deposit (even if prior to the Redemption Date), the shares shall be deemed to be
redeemed and no longer outstanding, and the holders thereof shall cease to be
shareholders with respect to such shares and shall have no rights with respect
thereto, except the right to receive from the bank or trust company payment of
the Redemption Price of the shares, without interest, upon surrender of their
certificates therefor and, on or before the Redemption Date, the right to
convert such shares and receive accrued and unpaid dividends as provided in
Section 9 hereof.  Any monies or securities so deposited and unclaimed at the
end of one year from the Redemption Date shall be released or repaid to the
Company, after which the holders of shares called for redemption shall be
entitled to receive payment of the Redemption Price only from the Company.

          Section 8.  Voting Rights.  Except as may otherwise be required by law
                      -------------                                             
or as set forth in Section 10 hereof, the Series F Preferred Stock shall have no
voting rights.

          Section 9.  Conversion.  The holders of Series F Preferred Stock shall
                      ----------                                                
have the following conversion rights:

          (a) Right to Convert.  Each share of Series F Preferred Stock shall be
              ----------------                                                  
convertible at any time at the option of the holder thereof, into fully paid and
nonassessable shares of Common Stock.

          (b) Conversion Price.  The Series F Preferred Stock shall be
              ----------------                                        
convertible into the number of shares of Common Stock which results from
dividing the Conversion Price (as hereinafter defined) in effect at the time of
conversion into $100.00 (appropriately adjusted for subdivisions or combinations
of the Series F Preferred Stock) for each share of Series F Preferred Stock
being converted.  The Conversion Price shall, subject to adjustment from time to
time as provided below, be (i) the Common Stock Value on the Surrender Date (as
defined in subsection (c) below), if the Common Stock Value on the Surrender
Date is equal to or less than $3.75 (in either case, appropriately adjusted for
subdivisions and combinations of shares of Common Stock and dividends on Common
Stock payable in shares of Common Stock) and (ii) $3.75, if the Common Stock
Value on the Surrender Date is more than $3.75 (appropriately adjusted for

                                      -8-
<PAGE>
 
subdivisions and combinations of shares of Common Stock and dividends on Common
Stock payable in shares of Common Stock) (the "Conversion Price").
                                               ----------------   

          (c) Mechanics of Conversion.  Each holder of Series F Preferred Stock
              -----------------------                                          
who desires to convert the same into shares of Common Stock shall surrender the
certificate or certificates therefor, duly endorsed, at the office of the
Company or of any transfer agent for the Series F Preferred Stock or Common
Stock, and shall give written notice to the Company at such office that such
holder elects to convert the same and shall state therein the number of shares
of Series F Preferred Stock being converted.  Thereupon the Company shall
promptly issue and deliver to such holder a certificate or certificates for the
number of shares of Common Stock to which such holder is entitled and shall
promptly pay in cash or, if the Company so elects or is legally or financially
unable to pay such dividends in cash, Common Stock (valued at the Common Stock
Value at the time of surrender), all accrued and unpaid dividends on the shares
of Series F Preferred Stock being converted, whether or not earned or declared,
to and including the time of conversion.  Such conversion shall be deemed to
have been made immediately prior to the close of business on the date of such
surrender (the "Surrender Date") of the certificate representing the shares of
                --------------                                                
Series F Preferred Stock to be converted, and the person entitled to receive the
shares of Common Stock issuable upon such conversion shall be treated for all
purposes as the record holder of such shares of Common Stock on the Surrender
Date.

          (d) Adjustment for Stock Splits and Combinations.  If the Company at
              --------------------------------------------                    
any time or from time to time after the Commitment Date effects a subdivision of
the outstanding Common Stock, the Conversion Price then in effect immediately
before that subdivision shall be proportionately decreased, and conversely, if
the Company at any time or from time to time after the Commitment Date combines
the outstanding shares of Common Stock into a smaller number of shares, the
Conversion Price then in effect immediately before the combination shall be
proportionately increased.  Any adjustment under this subsection (d) shall
become effective at the close of business on the date the subdivision or
combination becomes effective.

          (e) Adjustment for Certain Dividends and Distributions.  If the
              --------------------------------------------------         
Company at any time or from time to time after the Commitment Date makes, or
fixes a record date for the determination of holders of Common Stock entitled to
receive, a dividend or other distribution payable in additional shares of Common
Stock, then and in each such event the Conversion Price then in effect shall be
decreased as of the time of such issuance or, in the event such record date is
fixed, as of the close of business on such record date, by multiplying the
Conversion Price then in effect by a fraction (1) the numerator of which is the
total number of shares of Common Stock issued and outstanding immediately prior
to the time of such issuance or the close of business on such record date, and
(2) the denominator of which shall be the total number of shares of Common Stock
issued and outstanding immediately prior to the time of such issuance or the
close of business on such record date plus the number of shares of Common Stock
issuable in payment of such dividend or distribution; provided, however, that if
                                                      --------  -------         
such record date is fixed and such dividend is not fully paid or if such
distribution is not fully made on the date fixed therefor, the Conversion Price
shall be recomputed accordingly as of the close of business on such record date
and thereafter the Conversion Price shall be 

                                      -9-
<PAGE>
 
adjusted pursuant to this subsection (e) as of the time of actual payment of
such dividends or distributions.

          (f) Adjustments for Other Dividends and Distributions.  In the event
              -------------------------------------------------               
the Company at any time or from time to time after the Commitment Date makes, or
fixes a record date for the determination of holders of Common Stock entitled to
receive, a dividend or other distribution payable in securities of the Company
other than shares of Common Stock, then and in each such event provision shall
be made so that the holders of Series F Preferred Stock shall receive upon
conversion thereof, in addition to the number of shares of Common Stock
receivable thereupon, the amount of securities of the Company which they would
have received had their Series F Preferred Stock been converted into Common
Stock on the date of such event and had they thereafter, during the period from
the date of such event to and including the conversion date, retained such
securities receivable by them as aforesaid during such period, subject to all
other adjustments called for during such period under this Section 9 with
respect to the rights of the holders of the Series F Preferred Stock.

          (g) Adjustment for Reclassification, Exchange and Substitution.  In
              ----------------------------------------------------------     
the event that at any time or from time to time after the Commitment Date, the
Common Stock issuable upon the conversion of the Series F Preferred Stock is
changed into the same or a different number of shares of any class or classes of
stock, whether by recapitalization, reorganization, reclassification or
otherwise (other than a subdivision or combination of shares or stock dividend
provided for elsewhere in this Section 9), then and in any such event, as a
condition of such recapitalization, reorganization, reclassification or other
change, provision shall be made so that each holder of Series F Preferred Stock
shall have the right thereafter to convert such stock into the kind and amount
of stock and other securities and property receivable upon such
recapitalization, reorganization, reclassification or other change, by holders
of the maximum number of shares of Common Stock into which such shares of Series
F Preferred Stock could have been converted immediately prior to such
recapitalization, reorganization, reclassification or change, all subject to
further adjustment as provided herein.

          (h) Certificate of Adjustment.  In each case of an adjustment or
              -------------------------                                   
readjustment of the Conversion Price or the number of shares of Common Stock or
other securities issuable upon conversion of the Series F Preferred Stock, the
Company shall cause its chief financial officer to compute such adjustment or
readjustment in accordance with the provisions hereof and prepare a certificate
showing such adjustment or readjustment, and shall mail such certificate, by
first class mail, postage prepaid, to each registered holder of the Series F
Preferred Stock at the holder's address as shown in the Company's books.  The
certificate shall set forth such adjustment or readjustment, showing in
reasonable detail the facts upon which such adjustment or readjustment is based.

          (i) Notices of Record Date.  In the event of (i) any taking by the
              ----------------------                                        
Company of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend or
other distribution, or (ii) any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company, any
merger or consolidation of the 

                                      -10-
<PAGE>
 
Company with or into any other corporation (other than a merger of a wholly
owned subsidiary into the Company), or any transfer of all or substantially all
of the assets of the Company to any other person or any voluntary or involuntary
dissolution, liquidation or winding up of the Company, the Company shall mail to
each holder of Series F Preferred Stock at least thirty (30) days prior to the
record date specified therein, a notice specifying (1) the date on which any
such record is to be taken for the purpose of such dividend or distribution and
a description of such dividend or distribution, (2) the date on which any such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up is expected to become effective, and (3) the date, if
any, that is to be fixed, as to when the holders of record of Common Stock (or
other securities) shall be entitled to exchange their shares of Common Stock (or
other securities) for securities or other property deliverable upon such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up.

               (j)  Automatic Conversion.
                    -------------------- 

          (1) Each share of Series F Preferred Stock shall automatically be
converted into shares of Common Stock based on the then effective Conversion
Price (A) immediately upon the closing after the Commitment Date of an
underwritten public offering pursuant to an effective registration statement
under the Securities Act of 1933, as amended, covering the offering and sale of
Common Stock for the account of the Company in which the public offering price
equals or exceeds $2.50 per share of Common Stock (appropriately adjusted for
subdivisions and combinations of shares of Common Stock and dividends on Common
Stock payable in shares of Common Stock) and the obligation of the underwriters
with respect to which is that if any of the securities being offered are
purchased, all such securities must be purchased; provided, however, that such
                                                  --------  -------           
conversion shall be conditioned upon payment by the Company of all accrued and
unpaid dividends on the outstanding Series F Preferred Stock, whether or not
earned or declared, to and including the date of such conversion, payable either
in cash or Common Stock (valued at the Common Stock Value), or both, (B) upon
the receipt by the Company of a written notice from the holders that the number
of shares of the Series F Preferred Stock representing more than 50% of the
total number of such shares originally issued by the Company electing
unconditionally to convert such shares of Series F Preferred Stock and (C)
immediately upon written notice by the Company given at any time after the
average Common Stock Value over a twenty-day period equals or exceeds $5.00
(appropriately adjusted for subdivisions and combinations of shares of Common
Stock and dividends on Common Stock payable in shares of Common Stock).

          (2) Upon the occurrence of any of the events specified in paragraph
(1) above the outstanding shares of Series F Preferred Stock shall be converted
automatically without any further action by the holders of such shares and
whether or not the certificates representing such shares are surrendered to the
Company or its transfer agent; provided, however, that the Company shall not be
                               --------  -------                               
obligated to issue certificates evidencing the shares of Common Stock issuable
upon such conversion unless the certificates evidencing such shares of Series F
Preferred Stock are either delivered to the Company or its transfer agent as
provided below, or the holder notifies the Company or its transfer agent that
such certificates have been lost, stolen or destroyed and executes an agreement
satisfactory to the Company to indemnify the Company from any loss incurred by
it in connection with such certificates.  Upon the occurrence of such 

                                      -11-
<PAGE>
 
automatic conversion of the Series F Preferred Stock, the holders of Series F
Preferred Stock shall surrender the certificates representing such shares at the
office of the Company or any transfer agent for the Series F Preferred Stock or
Common Stock. Thereupon, there shall be issued and delivered to such holder
promptly at such office and in its name as shown on such surrendered certificate
or certificates, a certificate or certificates for the number of shares of
Common Stock into which the shares of Series F Preferred Stock surrendered were
convertible on the date on which such automatic conversion occurred, and the
Company shall promptly pay in cash or Common Stock (taken at the Common Stock
Value as of the date of such conversion), or both, all accrued and unpaid
dividends on the shares of Series F Preferred Stock being converted, whether or
not earned or declared, to and including the date of such conversion.

          (k) Fractional Shares.  No fractional shares of Common Stock shall be
              -----------------                                                
issued upon conversion of Series F Preferred Stock.  In lieu of any fractional
share to which the holder would otherwise be entitled, the Company shall pay
cash equal to the product of such fraction multiplied by the Common Stock Value
on the date of conversion.

          (l) Reservation of Stock Issuable Upon Conversion.  The Company shall
              ---------------------------------------------                    
at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Series F Preferred Stock, such number of its shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Series F Preferred Stock; and if at any time the
number of authorized but unissued shares of Common Stock shall not be sufficient
to effect the conversion of all then outstanding shares of the Series F
Preferred Stock, the Company will take such corporate action as may, in the
opinion of its counsel, be necessary to increase its authorized but unissued
shares of Common Stock to such number of shares as shall be sufficient for such
purpose.

          (m) Notices.  Any notice required or permitted by this Section 9 or
              -------                                                        
any other provision of this Certificate of Designation to be given to a holder
of Series F Preferred Stock or to the Company shall be in writing and be deemed
given upon the earlier of actual receipt or three (3) days after the same has
been deposited in the United States mail, by certified or registered mail,
return receipt requested, postage prepaid, and addressed (i) to each holder of
record at the address of such holder appearing on the books of the Company, or
(ii) to the Company at 10655 Sorrento Valley Road, San Diego, California 92121,
or (iii) to the Company or any holder, at any other address specified in a
written notice given to the other for the giving of notice.

          (n) Payment of Taxes.  The Company will pay all taxes (other than
              ----------------                                             
taxes based upon income) and other governmental charges that may be imposed with
respect to the issue or delivery of shares of Common Stock upon conversion of
shares of Series F Preferred Stock, including without limitation any tax or
other charge imposed in connection with any transfer involved in the issue and
delivery of shares of Common Stock in a name other than that in which the shares
of Series F Preferred Stock so converted were registered.

          (o) No Dilution or Impairment.  The Company shall not amend its
              -------------------------                                  
Certificate of Incorporation or participate in any reorganization, transfer of
assets, 

                                      -12-
<PAGE>
 
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, for the purpose of avoiding or seeking to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Company, but will at all times in good faith assist in carrying out all such
action as may be reasonably necessary or appropriate in order to protect the
conversion rights of the holders of the Series F Preferred Stock against
dilution or other impairment.

          (p)  Validity of Conversion Shares.  The Corporation agrees that it
               -----------------------------                                 
will from time to time take all such actions as may be necessary to assure that
all shares of Common Stock which may be issued upon conversion of any share of
Series F Preferred Stock will, upon issuance, be legally and validly issued,
fully paid and nonassessable and free from all liens and charges with respect to
the issue thereof (other than liens imposed by the holders of such shares); and,
without limiting the generality of the foregoing, the Corporation agrees that it
will from time to time take all such action as may be necessary to assure that
the par value per share, if any, of the Common Stock is at all times equal to or
less than that which would be required to maintain the status of the Common
Stock as fully paid without additional payment from the holders of the Series F
Preferred Stock.

          Section 10.  Restrictions and Limitations.  So long as any shares of
                       ----------------------------                           
Series F Preferred Stock remain outstanding, the Company shall not, and shall
not permit any Subsidiary to, without the vote or written consent by the holders
of at least a Majority of the Series F Preferred Stock:

               (a) Increase or decrease the aggregate number of authorized
shares of Series F Preferred Stock;

               (b) Increase or decrease the par value of the Series F Preferred
Stock;

          (c) Alter or change the powers, preferences or special rights of the
Series F Preferred Stock so as to affect them adversely; or

          (d) authorize, create or issue any new class or series of capital
stock or any other securities convertible into equity securities of the Company
(other than Common Stock) having a preference over, or being on a parity with,
the Series F Preferred Stock with respect to voting, dividends, redemption,
liquidation or dissolution of the Company, other than the Series D Preferred
Stock and Series E Preferred Stock.

          Section 11.  No Reissuance of Series F Preferred Stock.  No share or
                       -----------------------------------------              
shares of Series F Preferred Stock acquired by the Company by reason of
redemption, purchase, conversion or otherwise shall be reissued, and all such
shares shall be cancelled, retired and eliminated from the shares which the
Company shall be authorized to issue.

                                      -13-
<PAGE>
 
          IN WITNESS WHEREOF, Protein Polymer Technologies, Inc. has caused this
Certificate to be signed and attested by its duly authorized officers this ____
day of _________, 1998.


                         PROTEIN POLYMER TECHNOLOGIES, INC.



                         By:  
                             _____________________________
                              J. Thomas Parmeter, President


Attest:


By:
   __________________________
   Philip J. Davis, Secretary

                                      -14-

<PAGE>
 
                                                                   EXHIBIT 10.34
 
                                   SERIES E

                         SECURITIES PURCHASE AGREEMENT
                         -----------------------------


          THIS SECURITIES PURCHASE AGREEMENT (this "Agreement") is entered into
                                                    ---------                  
as of April 13, 1998 among Protein Polymer Technologies, Inc., a Delaware
corporation (the "Company"), and the other Persons listed on Annex A hereto
                  -------                                                  
(sometimes referred to herein individually as "Investor" and sometimes
                                               --------               
collectively as "Investors").
                 ---------   

          1.   Definitions.  Unless the context otherwise requires, the terms
               -----------                                                   
defined in this Section 1 shall have the meanings herein specified for all
purposes of this Agreement, applicable to both the singular and plural forms of
any of the terms herein defined.  All accounting terms defined in this Section 1
and those accounting terms used in this Agreement not defined in this Section 1
shall, except as otherwise provided for herein, be construed in accordance with
those generally accepted accounting principles that the Company is required to
employ by the terms of this Agreement.  If and so long as the Company has any
Subsidiary, the accounting terms defined in this Section 1 and those accounting
terms appearing in this Agreement but not defined in this Section 1 shall be
determined on a consolidated basis for the Company and each of its Subsidiaries,
and the financial statements and other financial information to be furnished by
the Company pursuant to this Agreement shall be consolidated.

                    "1996 Annual Report" shall mean the Company's Report on Form
                     ------------------                                         
10-KSB for the fiscal year ended December 31, 1996.

                    "Action" shall mean any action, suit, arbitration or other
                     ------   
legal, administrative or other proceeding by or before any court, arbitrator or
Governmental Entity.

                    "Agreement" shall mean this Securities Purchase Agreement.
                     ---------                                                

                    "Board" shall mean the Board of Directors of the Company.
                     -----                                                   

                    "California Securities Law" shall mean the California
                     -------------------------                           
Corporate Securities Law of 1968, as amended.

                    "Certificate" shall have the meaning assigned to it in
                     -----------                                          
Section 2 hereof.

                    "Closing" and "Closing Date" shall have the meanings
                     -------       ------------                         
assigned to such terms in Section 3(b) hereof.

                    "Code" shall mean the Internal Revenue Code of 1986, as
                     ----                                                  
amended.
<PAGE>
 
                    "Common Stock" shall mean the Company's common stock, par
                     ------------                                            
value $0.01 per share.

                    "Commission" shall mean the Securities and Exchange
                     ----------                                        
Commission.

                    "Conversion Stock" shall have the meaning assigned to it in
                     ----------------                                          
Section 2 hereof.

                    "Equity Security" shall mean the Common Stock, or any 
                     ---------------                                           
security convertible into the Common Stock, or any security carrying any warrant
or right to subscribe to or purchase the Common Stock, or any such warrant or
right.

                    "First Warrants" shall have the meaning assigned to such
                     --------------                                         
term in Section 2 hereof.

                    "First Warrant Stock" shall have the meaning assigned to
                     -------------------                                    
such term in Section 2 hereof.

                    "Form 10-QSB" shall mean the Company's Quarterly Report on 
                     -----------                                            
Form 10-QSB for the quarterly period ended September 30, 1997.

                    "Governmental Entity" shall mean any federal, state, local 
                     -------------------                                     
or foreign governmental bureau, commission, board, agency or instrumentality.

                    "Holder" of any security shall mean the record or 
                     ------
beneficial owner of such security. A Holder of Preferred Stock shall be treated
as the Holder of the Conversion Stock underlying the Preferred Stock and a
Holder of a Warrant shall be treated as the Holder of the Warrant Stock
underlying the Warrant.

                    "Holders of 75% of the Preferred Stock" shall mean, on a 
                     -------------------------------------                   
given date, the Person or Persons who are the Holders of greater than 75% of the
outstanding Preferred Stock.

                    "Initial Investors" shall mean those Investors purchasing
                     -----------------                                       
Preferred Stock and Warrants at the Closing.

                    "Investor" shall have the meaning assigned to it in the
                     --------                                              
introductory paragraph of this Agreement.

                    "Material Adverse Effect" shall mean a material and adverse
                     ----------------------- 
effect on the business, assets, property, business prospects, or financial
condition of the Company.

                    "Person" shall mean any natural person, corporation, trust,
                     ------                                                    
association, company, partnership, joint venture and other entity and any
government, governmental agency, instrumentality or political subdivision.

                                      -2-
<PAGE>
 
                    "Preferred Stock" shall have the meaning assigned to it in
                     ---------------                                          
Section 2 hereof.


                    "Required Payment" shall mean, with respect to each 
                     ----------------  
Investor, the number of shares of Preferred Stock purchased by such Investor,
multiplied by $100.00, as set forth on Annex A hereto.

                    "Restricted Stock" means (i) the Common Stock issued or 
                     ----------------    
issuable to the Investors upon conversion of the Preferred Stock issued and sold
pursuant to this Agreement or upon exercise of the Warrants and (ii) any Common
Stock issued or issuable (either directly or upon the conversion or exercise of
any warrant, right, or other security) with respect to the Common Stock referred
to in clause (i) above by way of a stock dividend or stock split or in
connection with a combination of shares, reclassification, recapitalization,
merger or consolidation or reorganization; provided, however, that such shares 
                                 --------  -------                            
of Common Stock shall only be treated as Restricted Stock if and so long as they
have not been (x) sold to or through a broker or dealer or underwriter in a
public distribution or a public securities transaction, or (y) sold in a
transaction exempt from the registration and prospectus delivery requirements of
the Securities Act under Section 4(1) thereof so that all transfer restrictions
and restrictive legends with respect to such Common Stock are removed upon the
consummation of such sale and the Company receives an opinion of counsel for the
Company (with a copy to the seller of such Common Stock), which shall be in form
and content reasonably satisfactory to the Company, to the effect that such
Common Stock in the hands of the purchaser is freely transferable without
restriction or registration under the Securities Act in any public or private
transaction.

                    "Rule 144" shall mean Rule 144 of the Commission under the
                     --------                                                 
Securities Act.

                    "Second Warrants" shall have the meaning assigned to such
                     ---------------                                         
term in Section 2 hereof.

                    "Second Warrant Stock" shall have the meaning assigned to
                     ---------------------                                   
such term is Section 2 hereof.

                    "Securities" shall have the meaning assigned to it in
                     ----------                                          
Section 2 hereof.

                    "Securities Act" shall mean the Securities Act of 1933, as
                     --------------                                           
amended.

                    "Stock Plans" shall mean the Company's 1989 Stock Option 
                     -----------     
Plan, 1992 Stock Option Plan, 1996 Non-Employee Directors' Stock Option Plan and
Employee Stock Purchase Plan, collectively.

                    "Subsequent Closing" and "Subsequent Closing Date" shall 
                     ------------------       -----------------------
have the meanings assigned to such terms in Section 3(c) hereof.

                                      -3-
<PAGE>
 
                    "Subsidiary" shall mean any Person, at least 50% of the 
                     ----------  
outstanding voting stock of which is at the time owned or controlled directly or
indirectly by the Company or by one or more of such subsidiary entities or both,
where "voting stock" means any shares of stock having general voting power in
electing the board of directors.

                    "Warrants" shall mean the First Warrants and Second
                     --------                                          
Warrants, collectively.

                    "Warrant Stock" shall mean the First Warrant Stock and
                     -------------                                        
Second Warrant Stock, collectively.

          2.   Authorization of Securities.  The Company has authorized the
               ---------------------------                                 
issue and sale of up to (i) 55,000 shares of its Series E Convertible Preferred
Stock, par value $0.01 per share (the "Preferred Stock"), having the rights,
                                       ---------------                      
preferences and privileges set forth in the Certificate of Designation
(hereinafter referred to as the "Certificate") attached hereto as Annex B, (ii)
                                 -----------                                   
warrants, having terms and conditions in the form of Warrant attached hereto as
Annex C (collectively, the "First Warrants"), to purchase up to an aggregate of
                            --------------                                     
2,400,000 shares of Common Stock (the "First Warrant Stock") and (iii) warrants,
                                       -------------------                      
having terms and conditions in the form of Warrant attached hereto as Annex D
(collectively, the "Second Warrants"), to purchase up to an aggregate of
                    ---------------                                     
1,200,000 shares of Common Stock (the "Second Warrant Stock").  The Common Stock
                                       --------------------                     
into which the Preferred Stock is convertible is sometimes referred to herein as
the "Conversion Stock"; and the Preferred Stock, the Warrants, the Warrant Stock
     ----------------                                                           
and the Conversion Stock are sometimes referred to herein individually and
collectively as the "Securities."
                     ----------  

          3.   Sale and Purchase of Preferred Stock and Warrants.
               ------------------------------------------------- 

               (a)    Upon the terms and subject to the conditions herein
contained, the Company agrees to sell to each Initial Investor, and each Initial
Investor severally agrees to purchase from the Company, at the Closing on the
Closing Date, (i) the number of shares of Preferred Stock, and (ii) the First
Warrants and the Second Warrants to purchase the number of shares of First
Warrant Stock and Second Warrant Stock, in each case as set forth opposite its
name on Annex A hereto, and each Initial Investor shall pay to the Company the
Required Payment.

               (b)    The initial closing of the sale to and purchase by the
Initial Investors of the Preferred Stock and Warrants (the "Closing") shall
                                                            -------  
occur at the offices of Paul, Hastings, Janofsky & Walker, 555 South Flower
Street, Los Angeles, California, at the hour of 10 o'clock A.M., California
time, on April 24, 1998 or at such different time or day as the Initial
Investors and the Company shall agree (the "Closing Date"). At the Closing, the
                                            ------------
Company will deliver to each Investor instruments or certificates evidencing the
Securities being purchased by it, each of which shall be registered in such
Initial Investor's name as stated on Annex A hereto, against delivery to the
Company of payment by cashier's check or wire transfer, or such other form
acceptable to the Company, in an amount equal to the Required Payment of such
Initial Investor.

                                      -4-
<PAGE>
 
               (c)    After the Closing, additional shares of Preferred Stock
(which, together with the Preferred Stock issued at the Closing, shall not
exceed 55,000 shares in the aggregate), additional First Warrants (which,
together with the First Warrants issued at the Closing, shall not represent the
right to acquire more than 2,400,000 shares of First Warrant Stock in the
aggregate) and additional Second Warrants (which together with the Second
Warrants issued at the Closing, shall not represent the right to acquire more
than 1,200,000 shares of Second Warrant Stock in the aggregate), may be issued
at one or more subsequent closings (each, a "Subsequent Closing") which are held
                                             ------------------  
May 15, 1998.  Each Subsequent Closing shall be effective upon the date (a
"Subsequent Closing Date") of the Company's receipt from an Investor of a
- ------------------------                                                 
cashier's check or wire transfer funds in the amount of such Investor's Required
Payment.  Effective upon each such Subsequent Closing, the applicable Investor
shall also enter into and become a party to this Agreement and the Registration
Rights Agreement as if such Investor had executed such agreements at the
Closing.

               (d)    Notwithstanding the foregoing, no shares of Preferred
Stock, and no Warrants, shall be offered or sold after the Closing to any
Investor if, in the opinion of the Company and its counsel, (i) such offer and
sale would not be exempt from the registration and prospectus delivery
requirements of the Securities Act and exempt from the registration or
qualification requirements of all applicable state securities laws, or (ii) such
offers and sales would detract from or adversely affect the availability and
effectiveness of the exemption from or compliance with such federal and state
requirements relied upon in respect of the offer and sale of Preferred Stock and
Warrants to the Initial Investors at the Closing.

               (e)    At the Closing, the Company shall prepare Annex A with
respect to the Investors purchasing Preferred Stock and Warrants at the Closing.
Promptly after each Subsequent Closing, the Company shall amend Annex A as
appropriate.

          4.   Register of Securities; Restrictions on Transfer of Securities;
               ---------------------------------------------------------------
Removal of Restrictions on Transfer of Securities.
- ------------------------------------------------- 

               4.1       Register of Securities.  The Company or its duly 
                         ----------------------  
appointed agent shall maintain a separate register for the shares of Preferred
Stock, Warrants and Common Stock, in which it shall register the issue and sale
of all such securities. All transfers of the Securities shall be recorded on the
register maintained by the Company or its agent, and the Company shall be
entitled to regard the registered holder of the Securities as the actual holder
of the Securities so registered until the Company or its agent is required to
record a transfer of such Securities on its register. Subject to Section 4.2(c)
hereof, the Company or its agent shall be required to record any such transfer
when it receives the Security to be transferred duly and properly endorsed by
the registered holder thereof or by its attorney duly authorized in writing.

               4.2       Restrictions on Transfer.
                         ------------------------ 

                         (a) Each Investor understands and agrees that the
Securities it will be acquiring have not been registered under the Securities
Act, and that accordingly they will not be fully transferable except as
permitted under various

                                      -5-
<PAGE>
 
exemptions contained in the Securities Act, or upon satisfaction of the
registration and prospectus delivery requirements of the Securities Act. Each
Investor acknowledges that it must bear the economic risk of its investment in
the Securities for an indefinite period of time since they have not been
registered under the Securities Act and therefore cannot be sold unless they are
subsequently registered or an exemption from registration is available.

                         (b) Each Investor hereby represents and warrants to the
Company that:
 
                             (i) Such Investor is acquiring the Securities it
has agreed to purchase (and, if applicable, will acquire the Warrant Stock and
Conversion Stock) for investment purposes only, for its own account, and not as
nominee or agent for any other Person, and not with the view to, or for resale
in connection with, any distribution thereof within the meaning of the
Securities Act.

                             (ii) Such Investor knows of no public solicitation
or advertisement of an offer in connection with the Securities.

                             (iii) Such Investor has carefully reviewed this
Agreement. Such Investor has had, during the course of the transaction and prior
to its purchase of the Preferred Stock and Warrants, the opportunity to ask
questions of and receive answers from the Company concerning the terms and
conditions of the offering and to obtain additional information necessary to
verify the accuracy of any information furnished to it or to which it had
access. Such Investor has received all information that it has requested
regarding the Company and believes that such information is sufficient to make
an informed decision with respect to the purchase of the Preferred Stock and
Warrants. Without limiting the generality of the foregoing, such Investor has
received a copy of (A) the 1996 Annual Report, (B) the Form 10-QSB, and (C) the
Risk Factors attached as Annex E hereto.

                             (iv) Such Investor is able to bear the economic
risk of its investment in the Preferred Stock and Warrants and has such
knowledge and experience in financial and business matters that it is capable of
evaluating the merits and risks of, and protecting its interests with respect
to, its investment in the Preferred Stock and Warrants. Such Investor is aware
of the risk involved in its investment in the Preferred Stock and Warrants and
has determined that such investment is suitable for it in light of its financial
circumstances and available investment opportunities.

                             (v) This Agreement, when executed and delivered by
such Investor, constitutes the legal, valid and binding obligation of such
Investor and is enforceable against such Investor in accordance with its terms.

                             (vi) Such Investor is an "accredited investor" as
that term is defined in Rule 501 of Regulation D promulgated under the
Securities Act.

                             (vii) Such Investor's jurisdiction of formation or
incorporation (if applicable) and principal place of business or its residency
as set forth on the signature page hereof or the annexes hereto by such Investor
are accurate.

                                      -6-
<PAGE>
 
                             (viii) The purchase by such Investor of the
Preferred Stock and Warrants hereunder does not violate or conflict with any law
or regulation applicable to such Investor.

                             (ix) No Person engaged by such Investor has, or
will have, any right or claim against the Company for any commission, fee or
other compensation as a finder or broker, or in any similar capacity.

                        (c)  Each Investor hereby further agrees with the
Company as follows:

                             (i) Subject to Section 4.3 hereof, the instruments
or certificates evidencing the Securities it has agreed to purchase, and each
instrument or certificate issued in transfer thereof, will bear the following
legend:

            "The securities evidenced by this certificate have not been
            registered under the Securities Act of 1933 and have been taken for
            investment purposes only and not with a view to the distribution
            thereof, and, except as stated in an agreement between the holder of
            this certificate, or its predecessor in interest, and the issuer
            corporation, such securities may not be sold or transferred unless
            there is an effective registration statement under such Act covering
            such securities or the issuer corporation receives an opinion, in
            form and content reasonably satisfactory to the issuer corporation,
            of counsel reasonably acceptable to the issuer corporation (which
            may be counsel for the issuer corporation) stating that such sale or
            transfer is exempt from the registration and prospectus delivery
            requirements of such Act."

                             (ii) The instruments or certificates representing
such Securities, and each instrument or certificate issued in transfer thereof,
will also bear any legend required under any applicable state securities law.

                             (iii) Prior to any proposed sale, assignment,
transfer or pledge of any Securities by an Investor, unless there is in effect a
registration statement under the Securities Act covering the proposed transfer,
the Investor shall give written notice to the Company of such Investor's
intention to effect such transfer, sale, assignment or pledge. Each such notice
shall describe the manner and circumstances of the proposed transfer, sale,
assignment or pledge in sufficient detail and shall be accompanied at such
holder's expense by either (A) an unqualified written opinion of legal counsel
who shall, and whose legal opinion shall, be reasonably satisfactory to the
Company addressed to the Company, to the effect that the proposed transfer of
the Securities may be effected without registration under the Securities Act, or
(B) a "no action" letter from the Commission to the effect that the transfer of
such securities without registration will not result in a recommendation by the
staff of the Commission that action be taken with respect thereto, whereupon the
holder of such Securities shall be entitled to transfer such Securities in
accordance with the terms of the notice delivered by the holder to the Company.
The Company will not require such a legal opinion or "no action" letter in any
transaction in compliance with Rule 144, unless otherwise required by the
Company's independent transfer agent.

                                      -7-
<PAGE>
 
                             (iv) Such Investor consents to the Company's making
a notation on its records or giving instructions to any transfer agent of the
Common Stock, Warrants or Preferred Stock in order to implement the restrictions
on transfer of the Securities mentioned in this subsection (c).

                      (d)    Each Investor, or each Person executing this
Agreement on behalf of an Investor, further represents and warrants to the
Company that such Investor or other Person, as the case may be, has been duly
authorized to, and has, and as of the Closing, and Subsequent Closing if
applicable, will have, full power and authority (including corporate, if
applicable) to, execute and deliver this Agreement and the Registration Rights
Agreement on behalf of such Investor, and to make the representations and
warranties to the Company in this Section 4 on behalf of such Investor, and to
perform the obligations of such Investor, if any, under this Agreement and the
Registration Rights Agreement.

             4.3      Removal of Transfer Restrictions.  Any legend endorsed 
                      --------------------------------    
on a certificate evidencing a Security pursuant to Section 4.2(c)(i) hereof and
the stop transfer instructions and record notations with respect to such
Security shall be removed and the Company shall issue a certificate without such
legend to the holder of such Security (a) if such Security is registered under
the Securities Act, (b) if such holder provides the Company with an opinion, in
form and content reasonably satisfactory to the Company, of counsel (which may
be counsel for the Company) reasonably acceptable to the Company to the effect
that a public sale or transfer of such Security may be made without registration
under the Securities Act or (c) if such Security may be sold under Rule 144.

     5.   Representations and Warranties by and Covenants of the Company.  In
          --------------------------------------------------------------     
order to induce each Investor to enter into this Agreement and to purchase the
Preferred Stock and Warrants, the Company hereby represents and warrants to each
Investor that, except as set forth on Annex F hereto:

          5.1  Organization, Standing, etc.  The Company is a corporation duly
               ---------------------------                                    
organized, validly existing and in good standing under the laws of the State of
Delaware, and has all requisite corporate power and authority to carry on its
business as presently conducted and as proposed to be conducted, to own and hold
its properties and assets, to enter into this Agreement, to issue the Securities
and to carry out the provisions hereof and the terms of the Certificate and the
Securities.

          5.2  Certificate and Bylaws.  The copies of the Certificate of
               ----------------------                                   
Incorporation and Bylaws of the Company which have been delivered to (or made
available for inspection by) the Investors prior to the execution of this
Agreement are true and complete and have not been amended or repealed, except
for the amendments to the Certificate of Incorporation that will be accomplished
by the filing of the Certificate with the Delaware Secretary of State.

          5.3  Subsidiaries.  The Company has no Subsidiaries or affiliated
               ------------                                                
companies and does not otherwise own or control, directly or indirectly, any
equity interest in any corporation, association or business entity.

                                      -8-
<PAGE>
 
          5.4  Qualification.  The Company is duly qualified as a foreign
               -------------                                             
corporation and in good standing in the State of California.  The Company is not
qualified to do business as a foreign corporation in any other jurisdiction and
such qualification is not required as of the date hereof, except where the
failure to be so qualified would not have a Material Adverse Effect.

          5.5  Capital Stock.
               ------------- 

               (a)  As of the Closing Date, the authorized capital stock of the
Company will consist of (i) 5,000,000 shares of preferred stock, par value $0.01
per share, 71,600 shares of which have been designated as Series D Preferred
Stock, 2,000,000 shares of which have been designated as Series X Junior
Participating Preferred Stock, 55,000 shares of which have been designated as
the Series E Preferred Stock and 27,317 shares of which have been designated as
the Series F Preferred Stock; and (ii) 25,000,000 shares of Common Stock; and
the Company will have no authority to issue any other capital stock.  There are
28,213.42 shares of Series D Preferred Stock issued and outstanding, of which
(A) 26,420 shall be exchanged for an equal number of shares of Series F
Preferred Stock on or about the Closing, (B) 896.42 shares may be converted into
Common Stock and (C) 897 shares may be exchanged for an equal number of shares
of Series F Preferred Stock after the Closing,  no shares of Series X Preferred
issued and outstanding, no shares of Series E Preferred Stock issued and
outstanding and no shares of Series F Preferred Stock issued and outstanding,
and, as of the Closing, before giving effect to the transactions contemplated by
this Agreement, 10,437,028 shares of Common Stock are issued and outstanding,
and all such outstanding shares of Series D Preferred Stock and Common Stock
have been duly authorized, validly issued, fully paid and nonassessable.

               (b)  The Company has reserved a total of 2,509,758 shares of
Common Stock for issuance upon the exercise of stock options or purchase rights
granted under the Stock Plans or under other stock option agreements.

               (c)  Except as contemplated by this Agreement or as expressly
provided in Annex F to this Agreement, the Company has no outstanding
subscription, option, warrant, right of first refusal, preemptive right, call,
contract, demand, commitment, convertible security or other instrument,
agreement or arrangement of any character or nature whatever under which the
Company is or may be obligated to issue Common Stock, preferred stock or other
Equity Security of any kind.

          5.6  Corporate Acts and Proceedings.  The Company has, and as of the
               ------------------------------                                 
Closing will have, full corporate power and authority to execute and deliver
this Agreement and to perform its obligations hereunder and the transactions
contemplated hereby.  All corporate acts and proceedings required for the
authorization, execution and delivery of this Agreement and the offer, issuance
and delivery of the Securities and the performance of this Agreement and the
terms of the Certificate have been lawfully and validly taken or will have been
so taken prior to the Closing.

          5.7  Compliance with Other Instruments.  The execution, delivery and
               ---------------------------------                              
performance by the Company of this Agreement and the observance of the terms of
the Certificate (a) will not require from the Board or stockholders of the
Company any

                                      -9-
<PAGE>
 
consent or approval that has not been validly and lawfully obtained, (b) will
not require the Company to obtain or effect any authorization, consent,
approval, license, exemption of or filing or registration with any Person,
except such as shall have been lawfully and validly obtained prior to the
Closing, (c) will not cause the Company to violate or contravene, except where
such violation or contravention would not have a Material Adverse Effect, (i)
any provision of law, (ii) any rule or regulation of any Governmental Entity or
the National Association of Securities Dealers, (iii) any order, writ, judgment,
injunction, decree, determination or award binding upon the Company, or (iv) any
provision of the Certificate of Incorporation or Bylaws of the Company, (d) will
not cause the Company to violate or be in conflict with, result in a breach by
the Company of or constitute (with or without notice or lapse of time or both) a
default by the Company under, any material agreement, lease or instrument,
commitment or arrangement to which the Company is a party or by which the
Company or any of its properties, assets or rights are bound or affected, except
where such violation, conflict, breach or default would not have a Material
Adverse Effect, and (e) will not result in the creation or imposition of any
lien. The Company is not in violation of, or (with or without notice or lapse of
time or both) in default under, any term or provision of its Certificate of
Incorporation or Bylaws or of any indenture, loan or credit agreement, note
agreement, deed of trust, mortgage, security agreement or other agreement, lease
or other instrument, commitment or arrangement to which the Company is a party
or by which any of the Company's properties, assets or rights are bound or
affected, except where such violation or default would not have a Material
Adverse Effect.

          5.8  Binding Obligations.
               ------------------- 

               (a)  This Agreement constitutes the legal, valid and binding
obligations of the Company, enforceable against the Company in accordance with
its terms, except as such enforcement is limited by bankruptcy, insolvency and
other similar laws affecting the enforcement of creditors' rights generally, and
by general equitable principles.

               (b)  The Warrants are duly authorized and, when executed,
delivered and paid for in accordance with the terms of this Agreement, will be
free and clear of all liens and restrictions, other than liens that may have
been created or suffered by the Investor and restrictions imposed by the
Securities Act, state securities laws or this Agreement.

               (c)  The Preferred Stock is duly authorized and, when issued in
accordance with the terms of this Agreement, will be duly authorized, validly
issued and outstanding, fully paid and nonassessable and free and clear of all
liens and restrictions, other than liens that might have been created or
suffered by the Investors and restrictions imposed by the Securities Act, state
securities laws or this Agreement.

               (d)  The Conversion Stock and Warrant Stock have been duly
authorized and, when issued in accordance with the terms of the Certificate and
the Warrants, respectively, will be duly authorized, validly issued and
outstanding, fully paid and nonassessable and free and clear of all liens and
restrictions, other than liens that might have been created or suffered by the
Investors and restrictions imposed by the Securities Act, state securities laws
or this Agreement.

                                      -10-
<PAGE>
 
          5.9  Securities Laws.  Subject to the accuracy of the representations
               ---------------                                                 
and warranties contained in Section 4.2, the offer, issue and sale of the
Preferred Stock, Warrants, Conversion Stock and (assuming no transfers of the
Warrants and no change in applicable law between the date hereof and the date of
exercise of the Warrants) the Warrant Stock are and will be exempt from the
registration and prospectus delivery requirements of the Securities Act, and are
and will be exempt from qualification under the California Securities Law and
the state securities laws of the jurisdictions where the Investors are resident.

          5.10  Financial Statements.  Included in the Form 10-QSB are the
                --------------------                                      
Company's unaudited balance sheet (the "Balance Sheet") as of September 30, 1997
                                        -------------                           
(the "Balance Sheet Date"), and the unaudited statement of operations for the
      ------------------                                                     
nine-month period then ended.  Included in the 1996 Annual Report are the
Company's audited balance sheets as of December 31, 1995 and 1996 and the
audited statements of operations, cash flow and shareholders' equity for the
period then ended, together with the related opinion of Ernst & Young LLP,
independent certified public accountants.  The foregoing financial statements
(i) are complete and correct in all material respects and are in accordance with
the books and records of the Company, (ii) present fairly the financial
condition of the Company at the Balance Sheet Date and other dates therein
specified and the results of operations and changes in financial position of the
Company for the periods therein specified, and (iii) have been prepared in
accordance with generally accepted accounting principles applied on a basis
consistent with prior accounting periods, except that the unaudited financial
statements are subject to year-end audit adjustments and do not contain
footnotes or statements of shareholders' equity and cash flow.

          5.11   Changes.  Since the Balance Sheet Date, except as disclosed in
                 -------                                                       
the Form 10-QSB or on Annex F, there has been no event which would have a
Material Adverse Effect, and the Company has not (a) mortgaged, pledged or
subjected to Lien any of its material assets, tangible or intangible, (b) sold,
transferred or leased any of its assets, (c) cancelled or compromised any
material debt or claim, or waived or released any right, of material value, (d)
suffered any physical damage, destruction or loss (whether or not covered by
insurance) having a material effect, (e) declared or paid any dividends on or
made any other distributions with respect to, or purchased or redeemed, any of
its outstanding Equity Securities, except for accrued dividends on the Series D
Preferred Stock, or (f) suffered or experienced any material adverse change or
loss in its business other than its continuing losses from operations.

          5.12   Material Agreements of the Company.  The Company is not a party
                 ----------------------------------                             
to or otherwise bound by any written or oral agreement, instrument or
arrangement that is material to the Company except for those agreements listed
in Item 13 of the 1996 Annual Report or as set forth on Annex F hereto.  The
Company has furnished or made available to each Investor true and complete
copies of all such agreements and all other agreements, instruments and other
documents requested by any Investor or its authorized representative.

          5.13   Litigation.  There is no Action pending and, to the best
                 ----------                                              
knowledge of the Company, there is no material Action threatened against the
Company or its properties, assets or business.  To the Company's best knowledge,
the Company is not in 

                                      -11-
<PAGE>
 
default with respect to any order, writ, judgment, injunction, decree,
determination or award of any court or of any Governmental Entity.

          5.14   Brokers or Finders.  Except as set forth on Annex F hereto, the
                 ------------------                                             
Company has not incurred, and will not incur, directly or indirectly, as a
result of any action taken by the Company, any liability for brokerage or
finders' fees or agents' commissions or any similar charges in connection with
this Agreement.  The Company agrees to indemnify and hold harmless the Investors
from any damages they incur as a result of any claims for such fees, commissions
or charges.

          5.15   Disclosure.  The representations and warranties of the Company
                 ----------                                                    
contained herein, when read together with the annexes hereto and the Form 10-QSB
and the 1996 Annual Report do not contain any untrue statement of material fact
or omit to state a material fact necessary to make the statements therein, in
light of the circumstances under which they are made, not misleading.

          5.16   Intellectual Property.
                 --------------------- 

                 (a)  To the best of its knowledge, the Company has sufficient
title to and ownership of, free and clear of all liens, claims and encumbrances
of any nature, all patents, patent rights, patent applications, inventions,
trademarks, service marks, trade names, copyrights and information, proprietary
rights and processes necessary for the conduct of its business; and the use by
the Company of the foregoing does not conflict with or constitute an
infringement of the rights of others.

                 (b)  The Company has not received any communications alleging
that it has violated, and has no knowledge that the Company has violated, or by
conducting its business, the Company will not, to the best of its knowledge,
violate, any of the patents, patent applications, inventions, trademarks,
service marks, trade names, copyrights or trade secrets, confidential
information, proprietary rights or processes of any other person.

          5.17   Retirement Obligations.  Except as set forth on Annex F hereto,
                 ----------------------                                         
the Company does not have any Employee Benefit Plan as defined in the Employee
Retirement Income Security Act of 1974, as amended, other than as disclosed in
the 1996 Annual Report.

          5.18   No Governmental Consent or Approval Required.  Based in part on
                 --------------------------------------------                   
the representations made by the Investors in Section 4 of this Agreement, no
authorization, consent, approval or other order of, declaration to, or
registration, qualification, designation or filing with, any federal, state or
local governmental agency or body is required by or from the Company for or in
connection with the valid and lawful authorization, execution and delivery by
the Company of this Agreement or any other agreement entered into by the Company
in connection with this Agreement, and consummation of the transactions
contemplated hereby or thereby, or for or in connection with the valid and
lawful authorization, issuance, sale and delivery of the Preferred Stock and the
Warrants or for or in connection with the valid and lawful authorization,
reservation, issuance, sale and delivery of the Conversion Stock and the Warrant
Stock, other than the filing of the Certificate with the Delaware Secretary of
State, the 

                                      -12-
<PAGE>
 
qualification (or taking of such action as may be necessary to secure an
exemption from qualification, if available) of the offer and sale of the
Preferred Stock and Warrants under the California Securities Law and other
applicable state or federal securities laws, which filings and qualifications,
if required, will be accomplished in a timely manner so as to comply with such
qualification or exemption from qualification requirements.

          5.19   NASD Compliance.  The Company's Common Stock is registered
                 ---------------                                           
pursuant to Section 12(g) of the Exchange Act and is listed on the the Nasdaq
SmallCap Market and, except as set forth on Annex F hereto, the Company has
taken no action designed to, or likely to have the effect of, terminating the
registration of the Common Stock under the Exchange Act or de-listing the Common
Stock from the Nasdaq SmallCap Market, nor has the Company received any
notification that the Securities and Exchange Commission or the National
Association of Securities Dealers, Inc. is contemplating terminating such
registration or listing.

          5.20   Reporting Status.  Except as set forth on Annex F hereto, the
                 ----------------                                             
Company has filed in a timely manner all documents that the Company was required
to file under the Exchange Act during the 12 months preceding the date of this
Agreement and such documents complied in all material respects with the
Commission's requirements as of their respective filing dates, and the
information contained therein as of the date thereof did not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein in light of the
circumstances under which they were made not misleading.

          5.21   Listing.  The Company shall use its best efforts to comply with
                 -------                                                        
all requirements of the National Association of Securities Dealers, Inc. with
respect to the issuance of the Securities and the listing of the Common Stock
issuable upon exercise of the Warrants and conversion of the Preferred Stock on
the Nasdaq SmallCap Market.

          5.22   No Financing Security Interests in Intellectual Property.  For
                 --------------------------------------------------------      
so long as at least 5,500 shares of Preferred Stock remain outstanding, the
Company agrees that it shall not give a security interest in or assign any of
its Intellectual Property in connection with any financing transaction without
the prior written consent of the Holders of 75% of the Preferred Stock.  For the
purposes of this Section 5.22, Intellectual Property shall include, but not be
limited to, all copyrights, trademarks, trade names, service marks, patents,
patent applications, patents pending, developmental ideas and concepts,
proprietary processes, blueprints, drawings, formulas, designs, reports,
technical data and all other proprietary information used or useful in
connection with the Company's business.

          6.     Conditions of Parties' Obligations.
                 ---------------------------------- 

                 6.1  Conditions of Investors' Obligations at  the Closing.  The
                      ----------------------------------------------------      
obligation of each Investor to purchase and pay for the Preferred Stock and
Warrants which it has agreed to purchase on the Closing Date (or, if applicable,
the Subsequent Closing Date) is subject to the fulfillment prior to or on the
Closing Date (or, if applicable, the Subsequent Closing Date) of the following
conditions, any of which may be waived in whole or in part by such Investor.

                                      -13-
<PAGE>
 
                     (a) No Errors, etc.  The representations and warranties 
                         --------------    
of the Company under this Agreement shall be deemed to have been made again on
the Closing Date (or, if applicable, the Subsequent Closing Date) and shall then
be true and correct in all material respects.

                     (b) Compliance with Agreement.  The Company shall have 
                         ------------------------- 
performed and complied with, in all material respects, all agreements and
conditions required by this Agreement to be performed or complied with by it on
or before the Closing Date (or, if applicable, the Subsequent Closing Date).

                     (c) Certificate of the Company.  With respect to the 
                         --------------------------  
Closing only, the Company shall have delivered to each Investor a certificate of
the Company dated the Closing Date, executed by its President, certifying the
satisfaction of the conditions specified in subsections (a), (b), (e), (f) and
(g) of this Section 6.1.

                     (d) Opinion of Counsel.  Paul, Hastings, Janofsky & Walker
                         ------------------   
LLP, counsel to the Company, shall have furnished an opinion to the Investors
covering the matters set forth in Sections 5.1, 5.5(a), 5.6, 5.8 and 5.9.

                     (e) Certificate.  The Certificate shall have been filed 
                         -----------   
with the Delaware Secretary of State.

                     (f) Qualification.  All authorizations, approvals or 
                         -------------  
permits, if any, of any governmental authority or regulatory body of the United
States or of any state that are required from the Company in connection with the
lawful issuance and sale of the Preferred Stock and Warrants to the Investors
pursuant to this Agreement shall have been duly obtained and shall be effective
on and as of the Closing.

                     (g) Exchange and Approval of Series D Preferred Stock.  
                         -------------------------------------------------
The holders of 26,420 shares of Series D Preferred Stock shall have agreed to
exchange such shares for an equal number of Series F Preferred Stock, and the
holders of a majority of the outstanding shares of Series D Preferred Stock
shall have consented to the issuance of the Series E Preferred Stock and the
other transactions contemplated hereby.

                     (h) Minimum Investment.  The Initial Investors shall be 
                         ------------------             
committed to purchase not less than 25,000 shares of Preferred Stock at the
Closing.

                     (i) Proceedings and Documents.  All corporate and other 
                         -------------------------      
proceedings in connection with the transactions contemplated at the Closing and
all documents incident thereto shall be reasonably satisfactory in form and
substance to the Investors and their counsel, and the Investors shall have
received all such counterpart originals and certified or other copies of such
documents as they may reasonably request.

                     (j) Expiration of Stockholder Notification Period.  In 
                         ---------------------------------------------    
accordance with the corporate governance requirements of the National
Association of Securities Dealers applicable to the Company and the financial
viability exception granted to the Company by Nasdaq in lieu of stockholder
approval of the transactions contemplated by this Agreement, the Company shall
have mailed the notification required by Nasdaq to its stockholders at least ten
days prior to the Closing Date and such ten day period shall have lapsed.

                                      -14-
<PAGE>
 
               6.2   Conditions of Company's Obligations.  The Company's
                     -----------------------------------                
obligation to issue and sell the Preferred Stock and Warrants to the Investors
on the Closing Date (or, if applicable, the Subsequent Closing Date) is subject
to the fulfillment prior to or at such date of (i) the conditions precedent
specified in paragraphs (e), (f), (g) and (h) of Section 6.1 hereof, (ii) the
condition described in Section 3(c) hereof, if applicable, and (iii) the
representations and warranties of the Investors under this Agreement shall be
deemed to have been made again on the Closing Date (or, if applicable, the
Subsequent Closing Date) and shall then be true and correct.

          7.   Approvals Required for Subsequent Closings.  Without the consent
               ------------------------------------------                      
of the Holders of 75% of the Preferred Stock, the Company shall not issue any
additional shares of the Preferred Stock after the Closing, whether at a
Subsequent Closing or otherwise.

          8.   Rights of First Refusal.
               ----------------------- 

               8.1   Subsequent Offerings.  Each Investor shall have the right 
                     --------------------    
of first refusal to purchase, pro rata, all (or any part of all) Equity
Securities that the Company may, from time to time, propose to sell and issue
after the Closing Date, other than the Equity Securities excluded by Section 8.5
hereof. Each Investor's pro rata share of such Equity Securities is the ratio of
the number of shares of Common Stock with respect to which such Investor is
deemed to be a Holder immediately prior to the issuance of such Equity
Securities to the total number of shares of Common Stock with respect to which
all Investors are deemed to be Holders immediately prior to the issuance of such
Equity Securities.

               8.2   Exercise of Rights.  If and each time the Company proposes
                     ------------------                                        
to issue any Equity Securities, it shall give each Investor written notice of
its intention, describing the Equity Securities, the price, and the general
terms and conditions upon which the Company proposes to issue the same.  Each
Investor shall have twenty (20) days from the giving of such notice to agree to
purchase its pro rata share of such Equity Securities for the price and upon the
terms and conditions specified in the notice by giving written notice to the
Company and stating therein the quantity of Equity Securities to be purchased.
Each Investor shall have a right of over allotment such that if any Investor
fails to exercise its rights hereunder to agree to purchase its pro rata portion
of the Equity Securities, the other Investors may agree to purchase the
nonpurchasing Investor's portion on a pro rata basis, within ten (10) days from
the end of such twenty (20) day period.

               8.3   Issuance of Equity Securities to Other Persons.  If the
                     ----------------------------------------------         
Investors fail to exercise in full the rights of first refusal within such
twenty (20) plus ten (10) days, the Company shall have sixty (60) days
thereafter to complete the sale of the Equity Securities in respect of which the
Investors' rights were not exercised, at a price and upon general terms and
conditions no more favorable to the purchasers thereof than specified in the
Company's notice to the Investors pursuant to Section 8.2 hereof.  If the
Company has not sold all of such Equity Securities within such sixty (60) days,
the Company shall not thereafter issue or sell any of such Equity Securities,
without first offering such securities to the Investors in the manner provided
above.

               8.4   Termination of Rights of First Refusal.  The rights of 
                     --------------------------------------  
first refusal established by this Section 8 shall terminate when there are no
longer more than 10,000 shares of Preferred Stock outstanding.

                                      -15-
<PAGE>
 
               8.5   Excluded Securities.  The rights of first refusal
                     -------------------                              
established by this Section 8 shall have no application to any of the following
Equity Securities: (a) Preferred Stock or Warrants issued pursuant to this
Agreement, including without limitation pursuant to Section 3(c) or 7 hereof,
(b) the Conversion Stock or the Warrant Stock, (c) stock issued pursuant to any
rights or agreements (including, without limitation, convertible securities,
options and warrants) outstanding on the date hereof as set forth on Annex F
pursuant to Section 5.5(c) hereof, (d) any Common Stock issued to employees,
officers, directors, consultants or advisors of the Company for the primary
purpose of soliciting or retaining their services, whether issued pursuant to
the Stock Plans or otherwise, (e) any Equity Securities issued for a
consideration other than cash pursuant to a merger, consolidation, acquisition
or similar business combination, (f) any Equity Securities issued in connection
with any stock split, stock dividend or reverse stock split, (g) any Equity
Securities issued in a bona fide, firmly underwritten public offering registered
under the Securities Act, (h) any Equity Securities which the Holders of a 75%
of Preferred Stock agree shall not be subject to this Section 8 and (i) shares
of the Company's Series D Preferred Stock or Series F Preferred Stock
outstanding on the date hereof and shares of Common Stock issuable upon
conversion thereof or as a dividend thereon.

               8.6   Prior Rights.  Nothwithstanding anything to the contrary
                     ------------                                            
herein, the rights set forth in this Section 8 are subject to the prior rights
of first refusal of the Series D Preferred Stock and Series F Preferred Stock.

          9.   Registration of Restricted Stock.
               -------------------------------- 

               9.1   Required Registration.
                     --------------------- 

                     (a) Subject to the existing registration rights of the
holders of Series D Preferred Stock, within ninety (90) to one hundred twenty
(120) days after the Closing Date, the Company shall prepare and file a
registration statement under the Securities Act, on a form selected by the
Company, covering the Restricted Stock and shall use its commercially reasonable
efforts to cause such registration statement to become effective as
expeditiously as possible and to remain effective until the earlier to occur of
the date (i) the Restricted Stock covered thereby have been sold, or (ii) by
which all Restricted Stock covered thereby may be sold under Rule 144, without
volume limitations.

                     (b) Following the effectiveness of a registration statement
filed pursuant to this section, the Company may, at any time, suspend the
effectiveness of such registration for up to 45 days, as appropriate (a
"Suspension Period"), by giving notice to the Holders of Restricted Stock, if
- ------------------                                                           
the Company shall have determined that the Company may be required to disclose
any material corporate development which disclosure may have a Material Adverse
Effect on the Company. Notwithstanding the foregoing, no more than two
Suspension Periods (i.e., 90 days) may occur in immediate succession.  The
Company shall use its best efforts to limit the duration and number of any
Suspension Periods.  The Holders of Restricted Stock agree that, upon receipt of
any notice from the Company of a Suspension Period, the Holders of Restricted
Stock shall forthwith discontinue disposition of Restricted Stock covered by
such registration statement or prospectus until the Holders of Restricted Stock
(i) are advised in writing by the Company that the use of the applicable
prospectus may be resumed, (ii) have received copies of a supplemental or
amended prospectus, if applicable, and (iii) have received copies of any
additional or supplemental filings which are incorporated or deemed to be
incorporated by reference into such prospectus.

                                      -16-
<PAGE>
 
               9.2   Registration Procedures.  When the Company effects the
                     -----------------------                               
registration of the Securities under the Securities Act pursuant to Section
9.1(a) hereof, the Company will, at its expense, as expeditiously as possible:

                     (a) In accordance with the Securities Act and the rules and
regulations of the Commission, prepare and file with the Commission a
registration statement with respect to such securities and use its commercially
reasonable efforts to cause such registration statement to become and remain
effective for the period described herein, and prepare and file with the
Commission such amendments to such registration statement and supplements to the
prospectus contained therein as may be necessary to keep such registration
statement effective for such period and such registration statement and
prospectus accurate and complete for such period;

                     (b) Furnish to the Holders of securities participating in
such registration such reasonable number of copies of the registration
statement, preliminary prospectus, final prospectus and such other documents as
such Holders may reasonably request in order to facilitate the public offering
of such securities;

                     (c) Use its commercially reasonable efforts to register or
qualify the securities covered by such registration statement under such state
securities or blue sky laws of such jurisdictions as such participating Holders
may reasonably request within twenty (20) days following the original filing of
such registration statement, except that the Company shall not for any purpose
be required to execute a general consent to service of process or to qualify to
do business as a foreign corporation in any jurisdiction where it is not so
qualified;

                     (d) Notify the Holders participating in such registration,
promptly after it shall receive notice thereof, of the date and time when such
registration statement and each post-effective amendment thereto has become
effective or a supplement to any prospectus forming a part of such registration
statement has been filed;

                     (e) Notify such Holders promptly of any request by the
Commission for the amending or supplementing of such registration statement or
prospectus or for additional information;

                     (f) Prepare and file with the Commission, promptly upon the
request of any such Holders, any amendments or supplements to such registration
statement or prospectus which, in the opinion of counsel for such Holders, is
required under the Securities Act or the rules and regulations thereunder in
connection with the distribution of the Restricted Stock by such Holders;

                     (g) Prepare and promptly file with the Commission, and
promptly notify such Holders of the filing of, such amendments or supplements to
such registration statement or prospectus as may be necessary to correct any
statements or omissions if, at the time when a prospectus relating to such
securities is required to be delivered under the Securities Act, any event has
occurred as the result of which any such prospectus or any other prospectus as
then in effect would include an untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary to make the
statements therein not misleading;

                     (h) In case any of such Holders is required to deliver a
prospectus at a time when the prospectus then in circulation is not in
compliance with the Securities Act or the rules and regulations of the
Commission, prepare promptly upon 

                                      -17-
<PAGE>
 
request such amendments or supplements to such registration statement and such
prospectus as may be necessary in order for such prospectus to comply with the
requirements of the Securities Act and such rules and regulations; and

                     (i) Advise such Holders, promptly after it shall receive
notice or obtain knowledge thereof, of the issuance of any stop order by the
Commission suspending the effectiveness of such registration statement or the
initiation or threatening of any proceeding for that purpose and promptly use
its best efforts to prevent the issuance of any stop order or to obtain its
withdrawal if such stop order should be issued.

              9.3    Expenses.  With respect to any registration effected
                     --------                                            
pursuant to Section 9.1 hereof, all fees, costs and expenses of and incidental
to such registration and the public offering in connection therewith shall be
borne by the Company; provided, however, that the Holders of Restricted Stock
shall bear their own legal fees, if any, and their pro rata share of any
underwriting discounts or commissions, if any.

              9.4    Indemnification.
                     --------------- 

                     (a) The Company will indemnify and hold harmless each
Holder of shares of Restricted Stock which are included in a registration
statement pursuant to the provisions of Section 9 hereof and any underwriter (as
defined in the Securities Act) for such Holder, and any person who controls such
Holder or such underwriter within the meaning of the Securities Act, and any
officer, director, employee, agent, partner or affiliate of such Holder, from
and against, and will reimburse such Holder and each such underwriter,
controlling person, officer, director, employee, agent, partner and affiliate
with respect to, any and all claims, actions, demands, losses, damages,
liabilities, costs and expenses to which such Holder or any such underwriter or
controlling person or any such officer, director, employee, agent, partner or
affiliate may become subject under the Securities Act or otherwise, insofar as
such claims, actions, demands, losses, damages, liabilities, costs or expenses
arise out of or are based upon (i) any untrue statement or alleged untrue
statement of any material fact contained in such registration statement, any
prospectus contained therein or any amendment or supplement thereto, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, or (ii) any breach of any representation, warranty,
agreement or covenant of the Company contained herein; provided, however, that
the Company will not be liable in any such case to the extent that any such
claim, action, demand, loss, damage, liability, cost or expense is caused by an
untrue statement or alleged untrue statement or omission or alleged omission so
made in strict conformity with information furnished by such Holder, such
underwriter or such controlling person or such officer, director, employee,
agent, partner or affiliate in writing specifically for use in the preparation
thereof.

                     (b) Each Holder of shares of the Restricted Stock which are
included in a registration pursuant to the provisions of Section 9 hereof will
indemnify and hold harmless the Company, and any Person who controls the Company
within the meaning of the Securities Act, from and against, and will reimburse
the Company and such controlling Persons with respect to, any and all losses,
damages, liabilities, costs or expenses to which the Company or such controlling
Person may become subject under the Securities Act or otherwise, insofar as such
losses, damages, liabilities, costs or expenses are caused by any untrue or
alleged untrue statement of any material fact contained in such registration
statement, any prospectus contained therein or any amendment or supplement
thereto, or are caused by the omission or the alleged 

                                      -18-
<PAGE>
 
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances in which
they were made, not misleading, in each case to the extent, but only to the
extent, that such untrue statement or alleged untrue statement or omission or
alleged omission was so made in reliance upon and in strict conformity with
written information furnished by such Holder specifically for use in the
preparation thereof. Notwithstanding the foregoing, the liability of any Holder
of Restricted Stock pursuant to this subsection (b) shall be limited to an
amount equal to the per share sale price (less any underwriting discount and
commissions) multiplied by the number of shares of Restricted Stock sold by such
Holder pursuant to the registration statement which gives rise to such
obligation to indemnify (less the aggregate amount of any damages which such
Holder has otherwise been required to pay in respect of such losses, damages,
liabilities, costs or expenses or any substantially similar losses, damages,
liabilities, costs or expenses arising from the sale of such Restricted Stock).

                     (c) Promptly after receipt by a party indemnified pursuant
to the provisions of paragraph (a) or (b) of this Section 9.4 of notice of the
commencement of any action involving the subject matter of the foregoing
indemnity provisions, such indemnified party will, if a claim thereof is to be
made against the indemnifying party pursuant to the provisions of paragraph (a)
or (b), notify the indemnifying party of the commencement thereof; but the
omission so to notify the indemnifying party will not relieve it from any
liability which it may have to an indemnified party otherwise than under this
Section 9.4 and shall not relieve the indemnifying party from liability under
this Section 9.4 unless such indemnifying party is prejudiced by such omission.
In case such action is brought against any indemnified party and it notifies the
indemnifying party of the commencement thereof, the indemnifying party shall
have the right to participate in, and, to the extent that it may wish, jointly
with any other indemnifying party similarly notified, to assume the defense
thereof, with counsel reasonably satisfactory to such indemnified party, and
after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, the indemnifying party will not be
liable to such indemnified party pursuant to the provisions of such paragraph
(a) or (b) for any legal or other expense subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation. No indemnifying party shall be liable to an indemnified
party for any settlement of any action or claim without the consent of the
indemnifying party. No indemnifying party will consent to entry of any judgment
or enter into any settlement which does not include as an unconditional term
thereof the giving by the claimant or plaintiff to such indemnified party of a
release from all liability in respect to such claim or litigation.

                     (d) If the indemnification provided for in subsection (a)
or (b) of this Section 9.4 is held by a court of competent jurisdiction to be
unavailable to a party to be indemnified with respect to any claims, actions,
demands, losses, damages, liabilities, costs or expenses referred to therein,
then each indemnifying party under any such subsection, in lieu of indemnifying
such indemnified party thereunder, hereby agrees to contribute to the amount
paid or payable by such indemnified party as a result of such claims, actions,
demands, losses, damages, liabilities, costs or expenses in such proportion as
is appropriate to reflect the relative fault of the indemnifying party on the
one hand and of the indemnified party on the other in connection with the
statements or omissions which resulted in such claims, actions, demands, losses,
damages, liabilities, costs or expenses, as well as any other relevant equitable
considerations. The relative fault of the indemnifying party and of the
indemnified party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a 

                                      -19-
<PAGE>
 
material fact or the omission or alleged omission to state a material fact
relates to information supplied by the indemnifying party or by the indemnified
party and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. Notwithstanding
the foregoing, the amount any Holder of Restricted Stock shall be obligated to
contribute pursuant to this subsection (d) shall be limited to an amount equal
to the per share sale price (less any underwriting discount and commissions)
multiplied by the number of shares of Restricted Stock sold by such Holder
pursuant to the registration statement which gives rise to such obligation to
contribute (less the aggregate amount of any damages which such Holder has
otherwise been required to pay in respect of such claim, action, demand, loss,
damage, liability, cost or expense or any substantially similar claim, action,
demand, loss, damage, liability, cost or expense arising from the sale of such
Restricted Stock). No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution hereunder from any person who was not guilty of such fraudulent
misrepresentation.

              9.5    Reporting Requirements Under the Exchange Act.  The Company
                     ---------------------------------------------              
shall timely file such information, documents and reports as the Commission may
require or prescribe under Section 13 of the Exchange Act.  The Company
acknowledges and agrees that the purposes of the requirements contained in this
Section 7.5 are (a) to enable the Holders of Restricted Stock to comply with the
current public information requirement contained in paragraph (c) of Rule 144
should any such Holder ever wish to dispose of any of the Restricted Stock
without registration under the Securities Act in reliance upon Rule 144 (or any
other similar exemptive provision) and (b) to qualify the Company for the use of
registration statements on Form S-3.

              9.6    Stockholder Information.  The Company may require each
                     -----------------------                               
Holder of Restricted Stock to furnish the Company such information with respect
to such Holder and the distribution of its Restricted Stock as the Company may
from time to time reasonably request in writing as shall be required by law or
by the Commission in connection therewith.

         10.  Miscellaneous.
              ------------- 

              10.1   Waivers and Amendments.
                     ---------------------- 

                     (a) With the written consent of the Holders of 75% of the
Preferred Stock then outstanding, the obligations of the Company and the rights
of the Holders of the Securities under this Agreement may be waived (either
generally or in a particular instance, either retroactively or prospectively and
either for a specified period of time or indefinitely), and with the same
consent the Company, when authorized by resolution of its Board, may enter into
a supplementary agreement for the purpose of changing in any manner or
eliminating any of the provisions of this Agreement or of any supplemental
agreement or modifying in any manner the rights hereunder of the Holders of the
Securities and the Company; provided, however, that no such waiver or
                            --------  -------   
supplemental agreement shall reduce the aforesaid proportion of Preferred Stock,
the Holders of which are required to consent to any waiver or supplemental
agreement, without the consent of the Holders of all of the Preferred Stock.

                     (b) Upon the effectuation of each such waiver, consent or
agreement of amendment or modification, the Company shall promptly give written
notice thereof to the Holders of the Preferred Stock who have not previously
consented thereto in writing.

                                      -20-
<PAGE>
 
              10.2   Effect of Waiver or Amendment.  Each Investor acknowledges
                     -----------------------------                             
that by operation of Section 10.1 hereof the Holders of 75% of the Preferred
Stock then outstanding will, subject to the limitations contained in such
Section 10.1, have the right and power to diminish or eliminate certain rights
of such Investor under this Agreement.

              10.3   Rights of Holders Inter Se.  Each Holder of Securities 
                     -------------------------- 
shall have the absolute right to exercise or refrain from exercising any right
or rights which such Holder may have by reason of this Agreement or any
Security, including, without limitation, the right to consent to the waiver of
any obligation of the Company under this Agreement and to enter into an
agreement with the Company for the purpose of modifying this Agreement or any
agreement effecting any such modification, and such Holder shall not incur any
liability to any other Holder or Holders of Securities with respect to
exercising or refraining from exercising any such right or rights.

              10.4   Exculpation Among Investors and Holders.  Each Investor
                     ---------------------------------------                
acknowledges that it is not relying upon any other Investor, or any officer,
director, employee, agent, partner or affiliate of any such other Investor, in
making its investment or decision to invest in the Company or in monitoring such
investment.  Each Investor agrees that no Investor nor any controlling person,
officer, director, stockholder, partner, agent or employee of any Investor shall
be liable for any action heretofore or hereafter taken or omitted to be taken by
any of them relating to or in connection with the Company or the Securities, or
both. Without limiting the generality of the foregoing, no Investor (nor any of
its affiliates, officers, directors, stockholders, partners, agents or
employees) or other Holder of any Security shall have any obligation, liability
or responsibility whatsoever for the accuracy, completeness or fairness of any
or all information about the Company or any Subsidiary or their respective
properties, business or financial and other affairs, acquired by such Investor
or Holder from the Company or the respective officers, directors, employees,
agents, representatives, counsel or auditors of either, and in turn provided to
another Investor or Holder, nor shall any such Investor (or such other Person)
have any obligation or responsibility whatsoever to provide any such information
to any other Investor (or such other Person) or Holder or to continue to provide
any such information if any information is provided.

              10.5   Brokers or Finders.  Each Investor represents and warrants
                     ------------------                                        
to the Company and each other Investor that, as a result of such Investor's
actions, except as set forth under Section 5.14 of Annex F, no Person has, or as
a result of the transaction as contemplated herein will have, any right or valid
claim against the Company or any other Investor for any commission, fee or other
compensation as a finder or broker, or in a similar capacity.

              10.6   Notices.  All notices, requests, consents and other
                     -------                                            
communications required or permitted hereunder shall be in writing and shall be
given personally, by air courier (with signed acknowledgment of receipt) or by
facsimile transmission (with confirmation of transmission):

          (a) If to any Holder of any of the Securities, addressed to such
          Holder at its address (or to its telecopier number) shown on his or
          its signature page hereto, or at such other address (or telecopier
          number) as such Holder may specify by written notice to the Company,
          or

                                      -21-
<PAGE>
 
          (b) If to the Company, addressed to it at 10655 Sorrento Valley Road,
          San Diego, California 92121 (or, if by telecopier, to (619) 558-6477)
          or at such other address (or telecopier number) as the Company may
          specify by written notice to the Investors,

and each such notice, request, consent and other communication shall for all
purposes of the Agreement be treated as being effective or having been given
upon receipt.

              10.7   Severability.  Should any one or more of the provisions of
                     ------------                                              
this Agreement or of any agreement entered into pursuant to this Agreement be
determined to be illegal or unenforceable, all other provisions of this
Agreement and of each other agreement entered into pursuant to this Agreement,
shall be given effect separately from the provision or provisions determined to
be illegal or unenforceable and shall not be affected thereby.

              10.8   Parties in Interest.  All the terms and provisions of this
                     -------------------                                       
Agreement shall be binding upon and inure to the benefit of the respective
successors of the parties hereto.  This Agreement shall not run to the benefit
of or be enforceable by any Person other than a party to this Agreement and his
or its successors and permitted assigns.

              10.9   Headings.  The headings of the Sections and paragraphs of
                     --------                                                 
this Agreement have been inserted for convenience of reference only and do not
constitute a part of this Agreement.

              10.10  Choice of Law.  Except where the issue for determination
                     -------------                                           
is one of corporate law, in which case the Delaware General Corporation Law
shall govern, it is the intention of the parties that the internal substantive
laws, and not the laws of conflicts, of California should govern the
enforceability and validity of this Agreement, the construction of its terms and
the interpretation of the rights and duties of the parties.

              10.11  Expenses.  Each party to this Agreement shall bear its own
                     --------                                                  
costs and expenses incurred with the negotiation and execution of this Agreement
and the performance of the transactions contemplated hereby.

              10.12  Counterparts.  This Agreement may be executed in any
                     ------------                                        
number of counterparts and by different parties hereto in separate counterparts,
with the same effect as if all parties had signed the same document.  All such
counterparts shall be deemed an original, shall be construed together and shall
constitute one and the same instrument.

              10.13  Publicity.  No party hereto shall originate any press
                     ---------                                            
release or other public announcement, written or oral, relating to this
Agreement, or to performance hereunder or the existence of any arrangement among
the parties hereto without the prior approval of the other parties hereto which
may be the subject of such press release or announcement, except to the extent
that such press release or announcement is reasonably concluded by a party to be
required by applicable law.  The Investors acknowledge that the Company will be
required to file a copy of this

                                      -22-
<PAGE>
 
Agreement, and the other agreements and instruments contemplated hereby, with
the Commission and to describe these transactions in its public filings.

              10.15  Board Seat.  The Company shall use its best efforts to
                     ----------                                            
nominate one person proposed by the Holders of 75% of the Preferred Stock to
serve as a director on the Board.


          IN WITNESS WHEREOF, the undersigned has caused this Agreement to be
duly executed as of the date first above written.

                                    PROTEIN POLYMER TECHNOLOGIES, INC.


                                    By _______________________________
                                     J. Thomas Parmeter, President

                                      -23-
<PAGE>
 
                [INVESTOR SIGNATURE PAGE TO PURCHASE AGREEMENT]


The foregoing Agreement is
hereby accepted as of the
date first above written.


____________________________________



By: __________________________________
    Name: ____________________________
    Title: _____________________________


Address for Notices:


     _____________________
     _____________________
     _____________________
     _____________________
     Attention:  ____________
     Telecopy: (___) ___-____

                                      -24-

<PAGE>
 
                                                                   EXHIBIT 10.35

                                 FIRST WARRANT
                       TO PURCHASE SHARES OF COMMON STOCK
                                       OF
                       PROTEIN POLYMER TECHNOLOGIES, INC.



THE WARRANTS REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AND NEITHER THESE WARRANTS NOR ANY INTEREST THEREIN MAY
BE TRANSFERRED, HYPOTHECATED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER
THAT ACT OR AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED.

No. E1-__                                     Warrant to Purchase _______ Shares
April __, 1998                                of Common Stock, $.01 Par Value



                        WARRANT TO PURCHASE COMMON STOCK
                                       of
                      PROTEIN POLYMER TECHNOLOGIES, INC.,
                             a Delaware corporation
          Void after the date set forth in the first paragraph hereof



          This certifies that, for value received, ______________, or registered
assigns ("Holder") is entitled, subject to the terms set forth below, to
          ------                                                        
purchase from Protein Polymer Technologies, Inc., a Delaware corporation (the
                                                                             
"Company"), ______ shares of Common Stock, $.01 par value, of the Company (such
- --------                                                                       
class of stock being referred to herein as "Common Stock"), as constituted on
                                            ------------                     
April ___, 1998  (the "Issue Date"), upon surrender of this Warrant, at the
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment therefor in the
consideration specified in Section 1 hereof, at the price of $2.50 per share
(the "Purchase Price").  This Warrant must be exercised, if at all, prior to the
      --------------                                                            
last day of the eighteenth calendar month after the Issue Date.  The shares of
Common Stock issued or issuable upon exercise of this Warrant are sometimes
referred to as the "Warrant Shares."  The term "Warrants" as used herein shall
                    --------------              --------                      
include this Warrant and any warrants delivered in substitution or exchange
therefor as provided herein.

          1.   Exercise.  This Warrant may be exercised at any time or from time
               --------                                                         
to time, on any business day, for all or part of the full number of shares of
Common Stock during the period of time called for hereby, by surrendering it at
the principal office of the Company, 10655 Sorrento Valley Road, First Floor,
San Diego, California 92121, with the subscription form duly executed, together
with payment for the Warrant Shares payable in cash, by check for same day funds
and/or by delivery and cancellation of promissory notes evidencing indebtedness
of the Company.  No other form of 
<PAGE>
 
consideration shall be acceptable for the exercise of this Warrant. A Warrant
shall be deemed to have been exercised immediately prior to the close of
business on the date of its surrender for exercise as provided above, and the
person entitled to receive the shares of Common Stock issuable upon such
exercise shall be treated for all purposes as the holder of such shares of
record as of the close of business on such date. As soon as practicable on or
after such date, and in any event within 10 days thereof, the Company shall
issue and deliver to the person or persons entitled to receive the same a
certificate or certificates for the number of shares of Common Stock issuable
upon such exercise. Upon any partial exercise, the Company will issue and
deliver to Holder a new Warrant or Warrants with respect to the shares of Common
Stock not so transferred. No fractional shares of Common Stock shall be issued
upon exercise of a Warrant. In lieu of any fractional share to which Holder
would be entitled upon exercise, the Company shall pay cash equal to the product
of such fraction multiplied by the Common Stock Value (as defined in the
Company's Certificate of Designation of Series E Preferred Stock) on the date of
exercise.

          2.   Payment of Taxes.  All shares of Common Stock issued upon the
               ----------------                                             
exercise of a Warrant shall be duly authorized, validly issued and outstanding,
fully paid and non-assessable.  Holder shall pay all taxes and other
governmental charges that may be imposed in respect of the issue or delivery
thereof and any tax or other charge imposed in connection with any transfer
involved in the issue of any certificate for shares of Common Stock in any name
other than that of the registered Holder of the Warrant surrendered in
connection with the purchase of such shares, and in such case the Company shall
not be required to issue or deliver any stock certificate until such tax or
other charge has been paid or it has been established to the Company's
satisfaction that no tax or other charge is due.


          3.   Transfer and Exchange.  This Warrant and all rights hereunder are
               ---------------------                                            
transferable, in whole but not in part, only with the prior approval of the
Company, which consent shall not be unreasonably withheld.  If such a proposed
transfer is so approved, this Warrant is transferable on the books of the
Company maintained for such purpose at its principal office referred to above by
Holder in person or by duly authorized attorney, upon surrender of this Warrant
properly endorsed and upon payment of any necessary transfer tax or other
governmental charge imposed upon such transfer.  Each taker and holder of this
Warrant, by taking or holding the same, consents and agrees that this Warrant,
when endorsed in blank, shall be deemed negotiable and that when this Warrant
shall have been so endorsed, the Holder hereof may be treated by the Company and
all other persons dealing with this Warrant as the absolute owner hereof for any
purpose and as the person entitled to exercise the rights represented hereby or
to the transfer hereof on the books of the Company, any notice to the contrary
notwithstanding; but until such transfer on such books, the Company may treat
the registered Holder hereof as the owner for all purposes.

          4.   Certain Adjustments.
               ------------------- 

          4.1       Adjustment for Reorganization, Consolidation, Merger.  In
                    ----------------------------------------------------     
case of any reorganization of the Company (or any other corporation, the stock
or other securities of which are at the time receivable on the exercise of this
Warrant) after the 

                                      -2-
<PAGE>
 
Issue Date, or in case, after such date, the Company (or any such other
corporation) shall consolidate with or merge into another corporation (other
than the merger of a wholly owned subsidiary into the Company) or convey all or
substantially all its assets to another corporation, then and in each such case
Holder, upon the exercise hereof as provided in Section 1 at any time after the
consummation of such reorganization, consolidation, merger or conveyance, shall
be entitled to receive, in lieu of the stock receivable upon the exercise of
this Warrant prior to such consummation, the stock or other securities or
property to which such Holder would have been entitled upon such consummation if
such Holder had exercised this Warrant immediately prior thereto.

          4.2       Adjustments for Dividends in Common Stock.  If the Company
                    -----------------------------------------                 
at any time or from time to time after the Issue Date makes, or fixes a record
date for the determination of holders of Common Stock entitled to receive, a
dividend payable in additional shares of Common Stock, then and in each such
event the Purchase Price then in effect shall be decreased as of the time of
such issuance or, in the event such record date is fixed, as of the close of
business on such record date, by multiplying the Purchase Price then in effect
by a fraction (1) the numerator of which is the total number of shares of Common
Stock issued and outstanding immediately prior to the time of such issuance or
the close of business on such record date, and (2) the denominator of which
shall be the total number of shares of Common Stock issued and outstanding
immediately prior to the time of such issuance or the close of business on such
record date plus the number of shares of Common Stock issuable in payment of
such dividend; provided, however, that if such record date is fixed and such
dividend is not fully paid on the date fixed therefor, the Purchase Price shall
be recomputed accordingly as of the close of business on such record date and
thereafter the Purchase Price shall be adjusted pursuant to this Section 4.2 as
of the time of actual payment of such dividends.

          4.3       Stock Split and Reverse Stock Split.  If the Company at any
                    -----------------------------------                        
time or from time to time after the Issue Date effects a subdivision of the
outstanding Common Stock, the Purchase Price then in effect immediately before
that subdivision shall be proportionately decreased and the number of shares of
Common Stock theretofore receivable upon the exercise of this Warrant shall be
proportionately increased.  If the Company at any time or from time to time
after the Issue Date combines the outstanding shares of Common Stock into a
smaller number of shares, the Purchase Price then in effect immediately before
that combination shall be proportionately increased and the number of shares of
Common Stock theretofore receivable upon the exercise of this Warrant shall be
proportionately decreased.  Each adjustment under this Section 4.3 shall become
effective at the close of business on the date the subdivision or combination
becomes effective.

          4.4       Accountants' Certificate as to Adjustment.  In each case of
                    -----------------------------------------                  
an adjustment in the shares of Common Stock receivable on the exercise of the
Warrants, the Company at its expense shall cause independent public accountants
of recognized standing selected by the Company (who may be the independent
public accountants then auditing the books of the Company) to compute such
adjustment in accordance with the terms of the Warrants and prepare a
certificate setting forth such adjustment and showing the facts upon which such
adjustment is based.  The Company will forthwith mail a copy of each such
certificate to each holder of a Warrant at the time outstanding.

                                      -3-
<PAGE>
 
          5.   Loss or Mutilation.  Upon receipt by the Company of evidence
               ------------------                                          
satisfactory to it (in the exercise of reasonable discretion) of the ownership
of and the loss, theft, destruction or mutilation of any Warrant and (in the
case of loss, theft or destruction) of indemnity satisfactory to it (in the
exercise of reasonable discretion), and (in the case of mutilation) upon
surrender and cancellation thereof, the Company will execute and deliver in lieu
thereof a new Warrant of like tenor.

          6.   Reservation of Common Stock.  The Company shall at all times
               ---------------------------                                 
reserve and keep available out of its authorized but unissued shares of Common
Stock, solely for the purpose of effecting the exercise of the Warrant, such
number of its shares of Common Stock as shall from time to time be sufficient to
effect exercise of the Warrant; and if at any time the number of authorized but
unissued shares of Common Stock shall not be sufficient to effect such exercise,
the Company will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purpose.

          7.   Notices of Record Date.  In the event of (i) any taking by the
               ----------------------                                        
Company of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend or
other distribution, or (ii) any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company, any
merger or consolidation of the Company with or into any other corporation (other
than a merger of a wholly owned subsidiary into the Company), or any transfer of
all or substantially all of the assets of the Company to any other person or any
voluntary or involuntary dissolution, liquidation or winding up of the Company,
the Company shall mail to the Holder at least thirty (30) days prior to the
record date specified therein, a notice specifying (1) the date on which any
such record is to be taken for the purpose of such dividend or distribution and
a description of such dividend or distribution, (2) the date on which any such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up is expected to become effective, and (3) the date, if
any, that is to be fixed, as to when the holders of record of Common Stock (or
other securities) shall be entitled to exchange their shares of Common Stock (or
other securities) for securities or other property deliverable upon such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up.

          8.   Investment Representation and Restriction on Transfer.
               ----------------------------------------------------- 

               8.1  Securities Law Requirements.
                    --------------------------- 

          (a) By its acceptance of this Warrant, Holder hereby represents and
warrants to the Company that this Warrant and the Warrant Shares will be
acquired for investment for its own account, not as a nominee or agent, and not
with a view to the sale or distribution of any part thereof, and that it has no
present intention of selling, granting participations in or otherwise
distributing the same.  By acceptance of this Warrant, Holder further represents
and warrants that it does not have any contract, undertaking, agreement or
arrangement with any person to sell, transfer or grant participations to any
person, with respect to this Warrant or the Warrant Shares.

                                      -4-
<PAGE>
 
          (b) By its acceptance of this Warrant, Holder understands that this
Warrant is not, and the Warrant Shares will not be, registered under the
Securities Act of 1933, as amended (the "Act"), on the basis that the issuance
of this Warrant and the Warrant Shares are exempt from registration under the
Act pursuant to Section 4(2) thereof, and that the Company's reliance on such
exemption is predicated on Holder's representations and warranties set forth
herein.

          (c) By its acceptance of this Warrant, Holder understands that the
Warrant and the Warrant Shares may not be sold, transferred, or otherwise
disposed of without registration under the Act, or an exemption therefrom, and
that in the absence of an effective registration statement covering the Warrant
and the Warrant Shares or an available exemption from registration under the
Act, the Warrant and the Warrant Shares must be held indefinitely.  In
particular, Holder is aware that the Warrant and the Warrant Shares may not be
sold pursuant to Rule 144 promulgated under the Act unless all of the conditions
of Rule 144 are satisfied.  Among the conditions for use of Rule 144 are the
availability of current information about the Company to the public, prescribed
holding periods which will commence only upon Holder's payment for the
securities being sold, manner of sale restrictions, volume limitations and
certain other restrictions.  By its acceptance of this Warrant, Holder
represents and warrants that, in the absence of an effective registration
statement covering the Warrant or the Warrant Shares, it will sell, transfer or
otherwise dispose of the Warrant and the Warrant Shares only in a manner
consistent with its representations and warranties set forth herein and then
only in accordance with the provisions of Section 8.1(d).

          (d) By its acceptance of this Warrant, Holder agrees that in no event
will it transfer or dispose of any of the Warrants or the Warrant Shares other
than pursuant to an effective registration statement under the Act, unless and
until (i) Holder shall have notified the Company of the proposed disposition and
shall have furnished the Company with a statement of the circumstances
surrounding the disposition, and (ii) if reasonably requested by the Company, at
the expense of the Holder or transferee, it shall have furnished to the Company
an opinion of counsel, reasonably satisfactory to the Company, to the effect
that (A) such transfer may be made without registration under the Act and (B)
such transfer or disposition will not cause the termination or the non-
applicability of any exemption to the registration and prospectus delivery
requirements of the Act or to the qualification or registration requirements of
the securities laws of any other jurisdiction on which the Company relied in
issuing the Warrant or the Warrant Shares.

               8.2  Legends; Stop Transfer.
                    ---------------------- 

                    (a) All certificates evidencing the Warrant Shares shall
bear a legend in substantially the following form:

          The securities represented by this certificate have not been
     registered under the Securities Act of 1933. These securities have been
     acquired for investment and not with a view to distribution and may not be
     offered for sale, sold, pledged or otherwise transferred in the absence of
     an effective registration statement for such securities under the
     Securities Act of 1933 or an opinion of counsel reasonably satisfactory in
     form and content to the issuer that such registration is not required under
     such Act.

                                      -5-
<PAGE>
 
          (b) The certificates evidencing the Warrant Shares shall also bear any
legend required by any applicable state securities law.

          (c) In addition, the Company shall make, or cause its transfer agent
to make, a notation regarding the transfer restrictions of the Warrant and the
Warrant Shares in its stock books, and the Warrant and the Warrant Shares shall
be transferred on the books of the Company only if transferred or sold pursuant
to an effective registration statement under the Act covering the same or
pursuant to and in compliance with the provisions of Section 8.1(d).

          9.   Notices.  All notices and other communications from the Company
               -------                                                        
to the Holder of this Warrant shall be mailed by first-class registered or
certified mail, postage prepaid, to the address furnished to the Company by
Holder.

          10.  Change; Waiver.  Neither this Warrant nor any term hereof may be
               --------------                                                  
changed, waived, discharged or terminated orally, but only by an instrument in
writing signed by the party against which enforcement of the change, waiver,
discharge or termination is sought.

         11.   Headings.  The headings in this Warrant are for purposes of
               --------                                                   
convenience in reference only, and shall not be deemed to constitute a part
hereof.

         12.   Governing Law.  This Warrant is delivered in California and shall
               -------------                                                    
be construed and enforced in accordance with and governed by the internal laws,
and not the law of conflicts, of such State; provided however, that to the
extent that an issue of determination is one of corporation law, then the
Delaware General Corporation Law shall govern.

                    PROTEIN POLYMER TECHNOLOGIES, INC.,
                    a Delaware corporation



                    By
                       ______________________________________
                         J. Thomas Parmeter, President

                                      -6-
<PAGE>
 
                               SUBSCRIPTION FORM
                               -----------------
                 (To be executed only upon exercise of Warrant)


          The undersigned, registered owner of this Warrant, irrevocably
exercises this Warrant and purchases ____________ of the number of shares of
Common Stock, $.01 par value, of PROTEIN POLYMER TECHNOLOGIES, INC., a Delaware
corporation, purchasable with this Warrant, and herewith makes payment therefor,
all at the price and on the terms and conditions specified in this Warrant.

DATED:______________

                                          ------------------------------------
                                          (Signature of Registered Owner)
      
                                          ------------------------------------
                                          (Street Address)
                 
                                           ------------------------------------

                                           (City)        (State)    (Zip)

                                      -7-
<PAGE>
 
                               FORM OF ASSIGNMENT
                               ------------------

          FOR VALUE RECEIVED the undersigned, registered owner of this Warrant,
hereby sells, assigns and transfers unto the Assignee named below all of the
rights of the undersigned under the within Warrant, with respect to the number
of shares of Common Stock, $.01 par value, set forth below:

Name of Assignee              Address         No. of Shares
- ----------------              -------         -------------



and does hereby irrevocably constitute and appoint _________________________
_________________________________________________ Attorney to make such transfer
on the books of PROTEIN POLYMER TECHNOLOGIES, INC., a Delaware corporation,
maintained for the purpose, with full power of substitution in the premises.

DATED: ___________________


                                       --------------------------------------
                                        (Signature)

                                       --------------------------------------
                                         (Witness)

                                      -8-

<PAGE>
 
                                                                   EXHIBIT 10.36

                                 SECOND WARRANT
                       TO PURCHASE SHARES OF COMMON STOCK
                                       OF
                       PROTEIN POLYMER TECHNOLOGIES, INC.


THE WARRANTS REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AND NEITHER THESE WARRANTS NOR ANY INTEREST THEREIN MAY
BE TRANSFERRED, HYPOTHECATED OR OTHERWISE DISPOSED OF WITHOUT REGISTRATION UNDER
THAT ACT OR AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED.

No. E2-__                                     Warrant to Purchase _______ Shares
April __, 1998                                   of Common Stock, $.01 Par Value



                    SECOND WARRANT TO PURCHASE COMMON STOCK
                                       of
                      PROTEIN POLYMER TECHNOLOGIES, INC.,
                             a Delaware corporation
          Void after the date set forth in the first paragraph hereof



          This certifies that, for value received, ______________, or registered
assigns ("Holder") is entitled, subject to the terms set forth below, to
          ------                                                        
purchase from Protein Polymer Technologies, Inc., a Delaware corporation (the
                                                                             
"Company"), ______ shares of Common Stock, $.01 par value, of the Company (such
- --------                                                                       
class of stock being referred to herein as "Common Stock"), as constituted on
                                            ------------                     
April __. 1998  (the "Issue Date"), upon surrender of this Warrant, at the
                      ----------                                          
principal office of the Company referred to below, with the subscription form
attached hereto duly executed, and simultaneous payment therefor in the
consideration specified in Section 1 hereof, at the price of $5.00 per share
(the "Purchase Price").  This Warrant must be exercised, if at all, prior to the
      --------------                                                            
last day of the thirty-sixth calendar month after the Issue Date.  The shares of
Common Stock issued or issuable upon exercise of this Warrant are sometimes
referred to as the "Warrant Shares."  The term "Warrants" as used herein shall
                    --------------              --------                      
include this Warrant and any warrants delivered in substitution or exchange
therefor as provided herein.

          1.   Exercise.  This Warrant may be exercised at any time or from time
               --------                                                         
to time, on any business day, for all or part of the full number of shares of
Common Stock during the period of time called for hereby, by surrendering it at
the principal office of the Company, 10655 Sorrento Valley Road, First Floor,
San Diego, California 92121, with the subscription form duly executed, together
with payment for the Warrant Shares payable in cash, by check for same day funds
and/or by delivery and cancellation of promissory notes evidencing indebtedness
of the Company.  No other form of 
<PAGE>
 
consideration shall be acceptable for the exercise of this Warrant. A Warrant
shall be deemed to have been exercised immediately prior to the close of
business on the date of its surrender for exercise as provided above, and the
person entitled to receive the shares of Common Stock issuable upon such
exercise shall be treated for all purposes as the holder of such shares of
record as of the close of business on such date. As soon as practicable on or
after such date, and in any event within 10 days thereof, the Company shall
issue and deliver to the person or persons entitled to receive the same a
certificate or certificates for the number of shares of Common Stock issuable
upon such exercise. Upon any partial exercise, the Company will issue and
deliver to Holder a new Warrant or Warrants with respect to the shares of Common
Stock not so transferred. No fractional shares of Common Stock shall be issued
upon exercise of a Warrant. In lieu of any fractional share to which Holder
would be entitled upon exercise, the Company shall pay cash equal to the product
of such fraction multiplied by the Common Stock Value (as defined in the
Company's Certificate of Designation of Series E Preferred Stock) on the date of
exercise.

          2.   Payment of Taxes.  All shares of Common Stock issued upon the
               ----------------                                             
exercise of a Warrant shall be duly authorized, validly issued and outstanding,
fully paid and non-assessable.  Holder shall pay all taxes and other
governmental charges that may be imposed in respect of the issue or delivery
thereof and any tax or other charge imposed in connection with any transfer
involved in the issue of any certificate for shares of Common Stock in any name
other than that of the registered Holder of the Warrant surrendered in
connection with the purchase of such shares, and in such case the Company shall
not be required to issue or deliver any stock certificate until such tax or
other charge has been paid or it has been established to the Company's
satisfaction that no tax or other charge is due.

          3.   Transfer and Exchange.  This Warrant and all rights hereunder are
               ---------------------                                            
transferable, in whole but not in part, only with the prior approval of the
Company, which consent shall not be unreasonably withheld.  If such a proposed
transfer is so approved, this Warrant is transferable on the books of the
Company maintained for such purpose at its principal office referred to above by
Holder in person or by duly authorized attorney, upon surrender of this Warrant
properly endorsed and upon payment of any necessary transfer tax or other
governmental charge imposed upon such transfer.  Each taker and holder of this
Warrant, by taking or holding the same, consents and agrees that this Warrant,
when endorsed in blank, shall be deemed negotiable and that when this Warrant
shall have been so endorsed, the Holder hereof may be treated by the Company and
all other persons dealing with this Warrant as the absolute owner hereof for any
purpose and as the person entitled to exercise the rights represented hereby or
to the transfer hereof on the books of the Company, any notice to the contrary
notwithstanding; but until such transfer on such books, the Company may treat
the registered Holder hereof as the owner for all purposes.

          4.   Certain Adjustments.
               ------------------- 

               4.1  Adjustment for Reorganization, Consolidation, Merger.  In
                    ----------------------------------------------------     
case of any reorganization of the Company (or any other corporation, the stock
or other securities of which are at the time receivable on the exercise of this
Warrant) after the Issue Date, or in case, after such date, the Company (or any
such other corporation) shall 

                                      -2-
<PAGE>
 
consolidate with or merge into another corporation (other than the merger of a
wholly owned subsidiary into the Company) or convey all or substantially all its
assets to another corporation, then and in each such case Holder, upon the
exercise hereof as provided in Section 1 at any time after the consummation of
such reorganization, consolidation, merger or conveyance, shall be entitled to
receive, in lieu of the stock receivable upon the exercise of this Warrant prior
to such consummation, the stock or other securities or property to which such
Holder would have been entitled upon such consummation if such Holder had
exercised this Warrant immediately prior thereto.

          4.2       Adjustments for Dividends in Common Stock.  If the Company
                    -----------------------------------------                 
at any time or from time to time after the Issue Date makes, or fixes a record
date for the determination of holders of Common Stock entitled to receive, a
dividend payable in additional shares of Common Stock, then and in each such
event the Purchase Price then in effect shall be decreased as of the time of
such issuance or, in the event such record date is fixed, as of the close of
business on such record date, by multiplying the Purchase Price then in effect
by a fraction (1) the numerator of which is the total number of shares of Common
Stock issued and outstanding immediately prior to the time of such issuance or
the close of business on such record date, and (2) the denominator of which
shall be the total number of shares of Common Stock issued and outstanding
immediately prior to the time of such issuance or the close of business on such
record date plus the number of shares of Common Stock issuable in payment of
such dividend; provided, however, that if such record date is fixed and such
dividend is not fully paid on the date fixed therefor, the Purchase Price shall
be recomputed accordingly as of the close of business on such record date and
thereafter the Purchase Price shall be adjusted pursuant to this Section 4.2 as
of the time of actual payment of such dividends.

          4.3       Stock Split and Reverse Stock Split.  If the Company at any
                    -----------------------------------                        
time or from time to time after the Issue Date effects a subdivision of the
outstanding Common Stock, the Purchase Price then in effect immediately before
that subdivision shall be proportionately decreased and the number of shares of
Common Stock theretofore receivable upon the exercise of this Warrant shall be
proportionately increased.  If the Company at any time or from time to time
after the Issue Date combines the outstanding shares of Common Stock into a
smaller number of shares, the Purchase Price then in effect immediately before
that combination shall be proportionately increased and the number of shares of
Common Stock theretofore receivable upon the exercise of this Warrant shall be
proportionately decreased.  Each adjustment under this Section 4.3 shall become
effective at the close of business on the date the subdivision or combination
becomes effective.

          4.4       Accountants' Certificate as to Adjustment.  In each case of
                    -----------------------------------------                  
an adjustment in the shares of Common Stock receivable on the exercise of the
Warrants, the Company at its expense shall cause independent public accountants
of recognized standing selected by the Company (who may be the independent
public accountants then auditing the books of the Company) to compute such
adjustment in accordance with the terms of the Warrants and prepare a
certificate setting forth such adjustment and showing the facts upon which such
adjustment is based.  The Company will forthwith mail a copy of each such
certificate to each holder of a Warrant at the time outstanding.

                                      -3-
<PAGE>
 
          5.   Loss or Mutilation.  Upon receipt by the Company of evidence
               ------------------                                          
satisfactory to it (in the exercise of reasonable discretion) of the ownership
of and the loss, theft, destruction or mutilation of any Warrant and (in the
case of loss, theft or destruction) of indemnity satisfactory to it (in the
exercise of reasonable discretion), and (in the case of mutilation) upon
surrender and cancellation thereof, the Company will execute and deliver in lieu
thereof a new Warrant of like tenor.

          6.   Reservation of Common Stock.  The Company shall at all times
               ---------------------------                                 
reserve and keep available out of its authorized but unissued shares of Common
Stock, solely for the purpose of effecting the exercise of the Warrant, such
number of its shares of Common Stock as shall from time to time be sufficient to
effect exercise of the Warrant; and if at any time the number of authorized but
unissued shares of Common Stock shall not be sufficient to effect such exercise,
the Company will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purpose.

          7.   Notices of Record Date.  In the event of (i) any taking by the
               ----------------------                                        
Company of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend or
other distribution, or (ii) any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company, any
merger or consolidation of the Company with or into any other corporation (other
than a merger of a wholly owned subsidiary into the Company), or any transfer of
all or substantially all of the assets of the Company to any other person or any
voluntary or involuntary dissolution, liquidation or winding up of the Company,
the Company shall mail to the Holder at least thirty (30) days prior to the
record date specified therein, a notice specifying (1) the date on which any
such record is to be taken for the purpose -of such dividend or distribution and
a description of such dividend or distribution, (2) the date on which any such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up is expected to become effective, and (3) the date, if
any, that is to be fixed, as to when the holders of record of Common Stock (or
other securities) shall be entitled to exchange their shares of Common Stock (or
other securities) for securities or other property deliverable upon such
reorganization, reclassification, transfer, consolidation, merger, dissolution,
liquidation or winding up.

          8.   Investment Representation and Restriction on Transfer.
               ----------------------------------------------------- 

               8.1  Securities Law Requirements.
                    --------------------------- 

                   (a) By its acceptance of this Warrant, Holder hereby
represents and warrants to the Company that this Warrant and the Warrant Shares
will be acquired for investment for its own account, not as a nominee or agent,
and not with a view to the sale or distribution of any part thereof, and that it
has no present intention of selling, granting participations in or otherwise
distributing the same. By acceptance of this Warrant, Holder further represents
and warrants that it does not have any contract, undertaking, agreement or
arrangement with any person to sell, transfer or grant participations to any
person, with respect to this Warrant or the Warrant Shares.

                                      -4-
<PAGE>
 
                   (b) By its acceptance of this Warrant, Holder understands
that this Warrant is not, and the Warrant Shares will not be, registered under
the Securities Act of 1933, as amended (the "Act"), on the basis that the
issuance of this Warrant and the Warrant Shares are exempt from registration
under the Act pursuant to Section 4(2) thereof, and that the Company's reliance
on such exemption is predicated on Holder's representations and warranties set
forth herein.

                   (c) By its acceptance of this Warrant, Holder understands
that the Warrant and the Warrant Shares may not be sold, transferred, or
otherwise disposed of without registration under the Act, or an exemption
therefrom, and that in the absence of an effective registration statement
covering the Warrant and the Warrant Shares or an available exemption from
registration under the Act, the Warrant and the Warrant Shares must be held
indefinitely. In particular, Holder is aware that the Warrant and the Warrant
Shares may not be sold pursuant to Rule 144 promulgated under the Act unless all
of the conditions of Rule 144 are satisfied. Among the conditions for use of
Rule 144 are the availability of current information about the Company to the
public, prescribed holding periods which will commence only upon Holder's
payment for the securities being sold, manner of sale restrictions, volume
limitations and certain other restrictions. By its acceptance of this Warrant,
Holder represents and warrants that, in the absence of an effective registration
statement covering the Warrant or the Warrant Shares, it will sell, transfer or
otherwise dispose of the Warrant and the Warrant Shares only in a manner
consistent with its representations and warranties set forth herein and then
only in accordance with the provisions of Section 8.1(d).

                   (d) By its acceptance of this Warrant, Holder agrees that in
no event will it transfer or dispose of any of the Warrants or the Warrant
Shares other than pursuant to an effective registration statement under the Act,
unless and until (i) Holder shall have notified the Company of the proposed
disposition and shall have furnished the Company with a statement of the
circumstances surrounding the disposition, and (ii) if reasonably requested by
the Company, at the expense of the Holder or transferee, it shall have furnished
to the Company an opinion of counsel, reasonably satisfactory to the Company, to
the effect that (A) such transfer may be made without registration under the Act
and (B) such transfer or disposition will not cause the termination or the non-
applicability of any exemption to the registration and prospectus delivery
requirements of the Act or to the qualification or registration requirements of
the securities laws of any other jurisdiction on which the Company relied in
issuing the Warrant or the Warrant Shares.

               8.2  Legends; Stop Transfer.
                    ---------------------- 

                    (a) All certificates evidencing the Warrant Shares shall
bear a legend in substantially the following form:

          The securities represented by this certificate have not been
          registered under the Securities Act of 1933. These securities have
          been acquired for investment and not with a view to distribution and
          may not be offered for sale, sold, pledged or otherwise transferred in
          the absence of an effective registration statement for such securities
          under the Securities Act of 1933 or an opinion of counsel reasonably
          satisfactory in form and content to the issuer that such registration
          is not required under such Act.

                                      -5-
<PAGE>
 
                    (b) The certificates evidencing the Warrant Shares shall
also bear any legend required by any applicable state securities law.

                    (c) In addition, the Company shall make, or cause its
transfer agent to make, a notation regarding the transfer restrictions of the
Warrant and the Warrant Shares in its stock books, and the Warrant and the
Warrant Shares shall be transferred on the books of the Company only if
transferred or sold pursuant to an effective registration statement under the
Act covering the same or pursuant to and in compliance with the provisions of
Section 8.1(d).

           9.   Notices.  All notices and other communications from the Company
                -------                                                        
to the Holder of this Warrant shall be mailed by first-class registered or
certified mail, postage prepaid, to the address furnished to the Company by
Holder.

          10.  Change; Waiver.  Neither this Warrant nor any term hereof may be
               --------------                                                  
changed, waived, discharged or terminated orally, but only by an instrument in
writing signed by the party against which enforcement of the change, waiver,
discharge or termination is sought.

      11. Headings.  The headings in this Warrant are for purposes of
          --------                                                   
convenience in reference only, and shall not be deemed to constitute a part
hereof.

      12. Governing Law.  This Warrant is delivered in California and shall
          -------------                                                    
be construed and enforced in accordance with and governed by the internal laws,
and not the law of conflicts, of such State; provided however, that to the
extent that an issue of determination is one of corporation law, then the
Delaware General Corporation Law shall govern.

                    PROTEIN POLYMER TECHNOLOGIES, INC.,
                    a Delaware corporation



                    By________________________________________
                            J. Thomas Parmeter, President

                                      -6-
<PAGE>
 
                               SUBSCRIPTION FORM
                               -----------------
                 (To be executed only upon exercise of Warrant)


          The undersigned, registered owner of this Warrant, irrevocably
exercises this Warrant and purchases ____________ of the number of shares of
Common Stock, $.01 par value, of PROTEIN POLYMER TECHNOLOGIES, INC., a Delaware
corporation, purchasable with this Warrant, and herewith makes payment therefor,
all at the price and on the terms and conditions specified in this Warrant.

DATED:______________

                         ------------------------------------------------
                         (Signature of Registered Owner)

                         ------------------------------------------------
                         (Street Address)

                         ------------------------------------------------
                         (City)        (State)    (Zip)

                                      -7-
<PAGE>
 
                               FORM OF ASSIGNMENT
                               ------------------

          FOR VALUE RECEIVED the undersigned, registered owner of this Warrant,
hereby sells, assigns and transfers unto the Assignee named below all of the
rights of the undersigned under the within Warrant, with respect to the number
of shares of Common Stock, $.01 par value, set forth below:

Name of Assignee                    Address               No. of Shares
- ----------------                    -------               -------------



and does hereby irrevocably constitute and appoint __________________________
_________________________________________________ Attorney to make such transfer
on the books of PROTEIN POLYMER TECHNOLOGIES, INC., a Delaware corporation,
maintained for the purpose, with full power of substitution in the premises.

DATED: ___________________


                                        ---------------------------------
                                        (Signature)

                                        ---------------------------------
                                         (Witness)

                                      -8-

<PAGE>
 
                                                                   Exhibit 10.37

                       Protein Polymer Technologies, Inc.
                           10655 Sorrento Valley Road
                          San Diego, California 92121


                                 April 13, 1998


Johnson & Johnson Development Corporation
One Johnson & Johnson Plaza
New Brunswick, New Jersey 08933-7002

       Re:  Protein Polymer Technologies, Inc.
            ----------------------------------

Ladies and Gentlemen:

          This letter agreement (this "Agreement") is entered into as of April
                                       ---------                              
13, 1998 between Protein Polymer Technologies, Inc., a Delaware corporation (the
"Company") and Johnson and Johnson Development Corporation, a New Jersey
 -------                                                                
corporation ("JJDC") in which JJDC (i) agrees to the exchange of shares of the
              ----                                                            
Company's Series D 10% Cumulative Convertible Preferred Stock ("Series D
                                                                --------
Preferred Stock") for an equal number of shares of the Company's Series F 10%
- ---------------                                                              
Cumulative Convertible Preferred Stock ("Series F Preferred Stock"), having the
                                         ------------------------              
rights, preferences and privileges set forth in the Certificate of Designation
(hereinafter referred to as the "Certificate") attached hereto as Annex A, (ii)
                                 -----------                                   
as the majority holder of the Series D Preferred Stock, waives any rights of
first refusal to the Company's proposed private placement of Series E
Convertible Preferred Stock ("Series E Preferred Stock") and issuance of
                              ------------------------                  
warrants in connection therewith, (iii) as the majority holder of the Series D
Preferred Stock, consents to the amendment of the definition of "Registrable
Securities" in the Amended and Restated Registration Rights Agreement dated as
of September 14, 1995 (the "Registration Rights Agreement") among the Company
                            -----------------------------                    
and the holders of Series D Preferred Stock, to include the shares issuable upon
conversion of the Series F Preferred Stock, (iv) as the majority holder of the
Series D Preferred Stock and sole holder of the Series F Preferred Stock,
consents to the registration rights of the Series E Preferred Stock, and (v) as
the majority holder of the Series D Preferred Stock, consents to the creation of
the Series E Preferred Stock and the Series F Preferred Stock.

            1.    Exchange of Shares.
                  ------------------ 

          Upon the terms and subject to the conditions herein contained, JJDC
agrees to deliver and exchange an aggregate of 27,317 shares of Series D
Preferred Stock, and the Company agrees to issue and deliver an aggregate of
27,317 shares of Series F Preferred Stock. At the initial closing (the
                                                                      
"Closing") which shall occur at the offices of  Paul, Hastings, Janofsky &
 -------                                                                  
Walker, 555 South Flower Street, Los Angeles, California, at the hour of 10
o'clock A.M., California time, on April 24, 1998 or at such different time or
day as JJDC and the Company shall agree (the "Closing Date"), the Company will
                                              ------------                    
deliver to JJDC instruments or certificates evidencing the shares of Series F
Preferred Stock, registered in the name of JJDC, against delivery to the Company
of 26,420 shares of Series D Preferred Stock held by JJDC.  JJDC shall
<PAGE>
 
Johnson & Johnson Development Corporation
April 13, 1998
Page 2

remain the holder of 897 shares of Series D Preferred Stock (the "Remaining
                                                                  ---------
Shares") until such time as the holders of the other remaining 896.42 shares of
- ------
Series D Preferred Stock (the "Other Remaining Shares") shall be converted into
                               ----------------------
shares of the Company's common stock, par value $.01 per share ("Common Stock").
                                                                 ------------
Upon the conversion of the Other Remaining Shares, the Remaining Shares shall be
exchanged automatically into an equal number of Series F Preferred Stock.  Upon
notification from the Company that the Other Remaining Shares have been
converted into Common Stock, the Company will deliver to JJDC instruments or
certificates evidencing the 897 shares of Series F Preferred Stock, registered
in the name of JJDC, against delivery to the Company of the Remaining Shares.

            2.    Representations and Warranties of JJDC.
                  -------------------------------------- 

                  a.     JJDC hereby represents and warrants to the Company that
it is acquiring the Series F Preferred Stock (and, if applicable, will acquire
the shares of Common Stock issuable upon conversion of the Series F Preferred
Stock (the "Conversion Stock")) for investment purposes only, for its own
            ----------------                                             
account, and not as nominee or agent for any other person, and not with the view
to, or for resale in connection with, any distribution thereof within the
meaning of the Securities Act of 1933, as amended (the "Securities Act").
                                                        --------------   


                  b.      This Agreement, when executed and delivered by JJDC,
constitutes the legal, valid and binding obligation of JJDC and is enforceable
against JJDC in accordance with its terms.

                  c.      JJDC is an "accredited investor" as that term is
defined in Rule 501 of Regulation D promulgated under the Securities Act.

          3.      Representations and Warranties by the Company.  In order to
                  ---------------------------------------------              
induce JJDC to enter into this Agreement and to exchange its shares of Series D
Preferred Stock for shares of Series F Preferred Stock, the Company hereby
represents and warrants to JJDC as follows:

                  a.       Organization, Standing, etc.  The Company is a
                           ---------------------------                   
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware, and has all requisite corporate power and authority to
carry on its business as presently conducted and as proposed to be conducted, to
own and hold its properties and assets, to enter into this Agreement, to issue
the Series F Preferred Stock and Conversion Stock and to carry out the
provisions hereof.

                  b.        Certificate and Bylaws.  The copies of the
                            ----------------------
Certificate of Incorporation and Bylaws of the Company which have been delivered
to (or made available for
<PAGE>
 
Johnson & Johnson Development Corporation
April 13, 1998
Page 3

inspection by) JJDC prior to the execution of this Agreement are true and
complete and have not been amended or repealed, except for the amendments to the
Certificate of Incorporation that will be accomplished by the filing of the
Certificate with the Delaware Secretary of State.

                  c.     Qualification.  The Company is duly qualified as a
                             -------------                                     
foreign corporation and in good standing in the State of California.  The
Company is not qualified to do business as a foreign corporation in any other
jurisdiction and such qualification is not required as of the date hereof,
except where the failure to be so qualified would not have a material adverse
effect.

                  d.      Capital Stock.
                          ------------- 

                         (1) As of the Closing Date, the authorized capital
stock of the Company will consist of (i) 5,000,000 shares of preferred stock,
par value $0.01 per share, 71,600 shares of which have been designated as Series
D Preferred Stock, 2,000,000 shares of which have been designated as Series X
Junior Participating Preferred Stock, 55,000 shares of which have been
designated as the Series E Preferred Stock and 27,317 shares of which have been
designated as the Series F Preferred Stock; and (ii) 25,000,000 shares of Common
Stock; and the Company will have no authority to issue any other capital stock.
There are 28,213.42 shares of Series D Preferred Stock issued and outstanding,
of which (A) 26,420 shall be exchanged for an equal number of shares of Series F
Preferred Stock concurrently with the Closing, (B) 896.42 shares may be
converted into Common Stock, and (C) 897 shares may be exchanged for an equal
number of shares of Series F Preferred Stock after the Closing, no shares of
Series X Preferred issued and outstanding, no shares of Series E Preferred Stock
issued and outstanding and no shares of Series F Preferred Stock issued and
outstanding, and, as of the Closing, before giving effect to the transactions
contemplated by this Agreement, 10,437,028 shares of Common Stock are issued and
outstanding, and all such outstanding shares of Series D Preferred Stock and
Common Stock have been duly authorized, validly issued, fully paid and
nonassessable.

                  e.    Corporate Acts and Proceedings.  The Company has, and as
                        ------------------------------                          
of the Closing will have, full corporate power and authority to execute and
deliver this Agreement and to perform its obligations hereunder and the
transactions contemplated hereby.  All corporate acts and proceedings required
for the authorization, execution and delivery of this Agreement and the offer,
issuance and delivery of the Series F Preferred Stock and Conversion Stock and
the performance of this Agreement have been lawfully and validly taken or will
have been so taken prior to the Closing.

                  f.     Compliance with Other Instruments.  The execution,
                       ---------------------------------                 
delivery and performance by the Company of this Agreement (a) will not require
from the Company's Board of Directors or stockholders of the Company any consent
or approval that has not been
<PAGE>
 
Johnson & Johnson Development Corporation
April 13, 1998
Page 4

validly and lawfully obtained, (b) will not require the Company to obtain or
effect any authorization, consent, approval, license, exemption of or filing or
registration with any person, except such as shall have been lawfully and
validly obtained prior to the Closing, (c) will not cause the Company to violate
or contravene, except where such violation or contravention would not have a
material adverse effect (i) any provision of law, (ii) any rule or regulation of
any governmental entity, (iii) any order, writ, judgment, injunction, decree,
determination or award binding upon the Company, or (iv) any provision of the
Certificate of Incorporation or Bylaws of the Company, (d) will not cause the
Company to violate or be in conflict with, result in a breach by the Company of
or constitute (with or without notice or lapse of time or both) a default by the
Company under, any material agreement, lease or instrument, commitment or
arrangement to which the Company is a party or by which the Company or any of
its properties, assets or rights are bound or affected, except where such
violation, conflict, breach or default would not have a material adverse effect,
and (e) will not result in the creation or imposition of any lien.

                  g.   Binding Obligations.
                       ------------------- 

                       (1) This Agreement constitutes the legal, valid and
binding obligations of the Company, enforceable against the Company in
accordance with its terms, except as such enforcement is limited by bankruptcy,
insolvency and other similar laws affecting the enforcement of creditors' rights
generally, and by general equitable principles.

                       (2) The Series F Preferred Stock is duly authorized and,
when issued in accordance with the terms of this Agreement, will be duly
authorized, validly issued and outstanding, fully paid and nonassessable and
free and clear of all liens and restrictions, other than liens that might have
been created or suffered by JJDC and restrictions imposed by the Securities Act,
state securities laws or this Agreement.

                  h.    Securities Laws.  Subject to the accuracy of the
                        ---------------                                 
representations and warranties contained in Section 2, the offer, issue and sale
of the Series F Preferred Stock are exempt from the registration and prospectus
delivery requirements of the Securities Act, and are exempt from qualification
under the California Securities Law of 1968, as amended.

          4.      Waiver of Rights of First Refusal.  As the majority holder of
                  ---------------------------------                            
the Series D Preferred Stock, JJDC hereby waives its rights of first refusal to
the Company's proposed private placement of Series E Preferred Stock and
issuance of warrants in connection therewith.


          5.      Consent to Amendment of Registration Rights Agreement.  As the
                  -----------------------------------------------------         
majority holder of the Series D Preferred Stock, JJDC hereby consents to the
amendment of the definition of "Registrable Securities" in the Registration
Rights Agreement to include the shares issuable upon conversion of the Series F
Preferred Stock.
<PAGE>
 
Johnson & Johnson Development Corporation
April 13, 1998
Page 5


          6.      Consent to Registration Rights of the Series E Preferred
                  --------------------------------------------------------
Stock.  As the majority holder of the Series D Preferred Stock and sole holder
- -----
of the Series F Preferred Stock, JJDC hereby consents to the registration rights
of the Series E Preferred Stock contained in that certian Securities Purchase
Agreement of even date herewith (the "Series E Securities Purchase Agreement")
                                      --------------------------------------  
among the Company and the other persons listed on the signature pages thereof, a
copy of which has hitherto been delivered to JJDC.

          7.      Consent to Creation of Series E and Series F Preferred Stock.
                  ------------------------------------------------------------  
As the majority holder of the Series D Preferred Stock, JJDC hereby consents to
the creation of the Series E Preferred Stock and the Series F Preferred Stock,
and the filing of the respective Certificates of Designations with respect
thereto with the Delaware Secretary of State.

          8.      Redemption.  The Company covenants and agrees that in the
                  ----------                                               
event the Company elects to redeem the Series E Preferred Stock, the Company
shall, at the time of such redemption, also redeem the Series F Preferred Stock.

          9.      Miscellaneous.
                  ------------- 

                  a.   Waivers and Amendments.  The rights of the parties hereto
                       ----------------------                                   
may be waived, amended or modified (either generally or in a particular
instance, either retroactively or prospectively and either for a specified
period of time or indefinitely) only in a writing signed by both of the parties
hereto.

                  b.   Notices.  All notices, requests, consents and other
                       -------                                            
communications required or permitted hereunder shall be in writing and shall be
given personally, by air courier (with signed acknowledgment of receipt) or by
facsimile transmission (with confirmation of transmission) (i) if to the Company
at the address listed above (or if by telecopier, to (619) 558-6477) or at such
other address (or telecopier number) as the Company may specify by written
notice to JJDC, or (ii) if to JJDC at the address listed above or if by
telecopier to (908) 524-5045; and each such notice, request, consent and other
communication shall for all purposes of the Agreement be treated as being
effective or having been given upon receipt.

                  c.   Severability.  Should any one or more of the provisions
                       ------------                                           
of this Agreement be determined to be illegal or unenforceable, all other
provisions of this Agreement shall be given effect separately from the provision
or provisions determined to be illegal or unenforceable and shall not be
affected thereby.

                  d.   Parties in Interest.  All the terms and provisions of
                       -------------------                                  
this Agreement shall be binding upon and inure to the benefit of the respective
successors of the parties hereto.
<PAGE>
 
Johnson & Johnson Development Corporation
April 13, 1998
Page 6

                  e.   Headings.  The headings of the paragraphs of this
                       --------                                         
Agreement have been inserted for convenience of reference only and do not
constitute a part of this Agreement.

                  f.   Choice of Law.  Except where the issue for
                       ------------                             
determination is one of corporate law, in which case the Delaware General
Corporation Law shall govern, it is the intention of the parties that the
internal substantive laws, and not the laws of conflicts, of California should
govern the enforceability and validity of this Agreement, the construction of
its terms and the interpretation of the rights and duties of the parties.

                  g.   Counterparts.  This Agreement may be executed in any
                       ------------                                        
number of counterparts and by different parties hereto in separate counterparts,
with the same effect as if all parties had signed the same document.  All such
counterparts shall be deemed an original, shall be construed together and shall
constitute one and the same instrument.


                                      PROTEIN POLYMER
                                      TECHNOLOGIES, INC.


                                      By:_____________________________
                                           J. Thomas Parmeter
                                           President and Chief Executive
                                           Officer

ACCEPTED AND AGREED TO:

JOHNSON & JOHNSON
DEVELOPMENT CORPORATION


By: _____________________________
   Name: _________________________
   Title: __________________________

<PAGE>
 
                                                                    EXHIBIT 23.1



              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statements on
Forms S-3 (Nos. 333-19695, 333-62761, 333-45759) and Forms S-8 (Nos. 33-61704,
33-61708, 33-68046), of our report dated February 5, 1999 with respect to the
financial statements of Protein Polymer Technologies, Inc. included in the
Annual Report (Form 10-KSB) for the year ended December 31, 1998.



                                                               ERNST & YOUNG LLP



San Diego, California
March 2, 1999

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<PAGE>

<ARTICLE> 5
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1998             DEC-31-1997
<CASH>                                       1,348,148                 325,021
<SECURITIES>                                         0                 974,817
<RECEIVABLES>                                    9,965                   5,548
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                   2,970
<CURRENT-ASSETS>                             1,449,607               1,541,706
<PP&E>                                       2,073,486               1,876,026
<DEPRECIATION>                             (1,475,039)             (1,106,462)
<TOTAL-ASSETS>                               2,225,231               2,347,887
<CURRENT-LIABILITIES>                          850,022                 691,686
<BONDS>                                              0                       0
                                0                       0
                                  7,600,226               2,667,403
<COMMON>                                    26,657,399              22,882,241
<OTHER-SE>                                (32,987,964)            (24,083,511)
<TOTAL-LIABILITY-AND-EQUITY>                 2,225,231               2,347,887
<SALES>                                         67,096                  76,917
<TOTAL-REVENUES>                               255,824                 722,958
<CGS>                                            4,158                  26,141
<TOTAL-COSTS>                                   29,158                  61,141
<OTHER-EXPENSES>                             5,864,819               5,115,750
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                              26,692                   7,763
<INCOME-PRETAX>                            (5,638,203)             (4,453,933)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                        (5,638,203)             (4,453,933)
<DISCONTINUED>                                       0                       0
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<CHANGES>                                            0                       0
<NET-INCOME>                               (5,638,203)             (4,453,933)
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