BIOTIME INC
S-3/A, 1997-01-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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     As filed with the Securities and Exchange Commission on January 10, 1997

                          Registration No.333-17321
- ---------------------------------------------------------------------------
- ---------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                 AMENDMENT NO.1
                                   TO FORM S-3
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                                  BIOTIME, INC.
               (Exact name of Registrant as specified in charter)

             California                                  94-3127919
    (State or other jurisdiction of                    (I.R.S. Employer
    incorporation or organization)                  Identification Number)
 
                                                  Paul E. Segall, President
            935 Pardee Street                            BioTime, Inc.
          Berkeley, California 94710                  935 Pardee Street
             (510) 845-9535                       Berkeley, California 94710
         (Address, including zip code,                  (510) 845-9535
   and telephone  number,  including area,     (Name,  address, including zip
      code, of Registrant's principal            code, and telephone number,  
         executive offices)                     including area code, of agent
                                                        of service)
   
                            -------------------------
Copies of all communications, including all communications sent to the agent 
for service, should be sent to:
                             RICHARD S. SOROKO, ESQ.
                   Lippenberger, Thompson, Welch & Soroko LLP
                        250 Montgomery Street, Suite 500
                         San Francisco, California 94104
                               Tel. (415) 421-5300
                            -------------------------

Approximate  date of  commencement  of proposed  sale to the public:  As soon as
practicable after this Registration Statement becomes effective.

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

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

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

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

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. |_|
<TABLE>
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE
===========================================================================================================================
                                                                                                          Proposed
                                          Amount               Proposed              Maximum              Amount of
 Title of Each Class of Securities        to be            Maximum Offering         Aggregate           Registration
  to be Registered                      Registered         Price Per Unit(1)     Offering Price(1)           Fee
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>               <C>                    <C>      
Common Shares, no par value(2)             283,109               $19.25            $5,449,848.30          $1,750.00(7)
- ---------------------------------------------------------------------------------------------------------------------------
Common Share Purchase Rights             2,831,084                 --                    --                   --
- ---------------------------------------------------------------------------------------------------------------------------
Common Shares, no par value(3)              29,013               $ 7.81             $ 226,591.53           $  68.66(5)
- ---------------------------------------------------------------------------------------------------------------------------
Common Shares, no par value(4)              76,000               $ 7.18             $ 545,680.00           $ 165.36(6)
- ---------------------------------------------------------------------------------------------------------------------------
Warrants to Purchase Common Shares          76,000                  --                   --                   --
- ---------------------------------------------------------------------------------------------------------------------------
Total Registration Fee.....................................................................................$1,984.02(7)
===========================================================================================================================
<FN>
(1)  Estimated solely for the purpose of calculating the registration fee.
(2)  Issuable upon exercise of the Common Share Purchase Rights.
(3)  Issued upon exercise of certain Warrants.
(4)  Issuable upon exercise of certain Warrants.
(5)  Previously paid with Registration Statement 33-44549.
(6)  Previously paid with Registration Statement 33-48717.
(7)  Previously paid.
</FN>
</TABLE>
The Registrant hereby amends this  Registration  Statement on such date or dates
as may be necessary to delay its Effective Date until the Registrant  shall file
a further amendment which specifically  states that this Registration  Statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities  Act of 1933,  or  until  the  Registration  Statement  shall  become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

Pursuant to Rule 429,  the  Prospectus  included as a part of this  Registration
Statement also relates to Registration Statements 33-44549 and 33-48717.

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


<PAGE>


PROSPECTUS
                                  BIOTIME, INC.

                              283,109 COMMON SHARES

                Issuable Upon the Exercise of Subscription Rights

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

BioTime,  Inc. (the  "Company" or "BioTime") is issuing to its  shareholders  of
record,  including beneficial owners of shares held in the name of Cede & Co. as
nominee for The Depository  Trust Company or in the name of any other depository
or nominee ("Record Date Shareholders"), as of the close of business on December
27, 1996 (the "Record Date") rights ("Rights")  entitling the holders thereof to
subscribe for and purchase up to an aggregate of 283,109 common  shares,  no par
value  ("Common  Shares"),  of the  Company  at a price of $20.00 per share (the
"Subscription  Price").  Each Record Date Shareholder will receive one Right for
each Common  Share owned on the Record  Date,  and will be entitled to subscribe
for and purchase from the Company one new Common Share for every ten rights held
(the "Primary  Subscription"). Record Date Shareholders who fully exercise their
Rights will be entitled  to the  additional  privilege  of  subscribing  for and
purchasing, subject to certain limitations and subject to allocation, any Common
Shares not  acquired by other  holders of Rights  through  the  exercise of such
Rights (the  "Over-Subscription  Privilege").

     The Offer  provides the Company with the  opportunity  to raise  additional
capital without  diluting the ownership  interests of existing  shareholders who
exercise their Rights, and without paying underwriting commissions and expenses.
Shareholders  who  exercise  their  Rights in the Offer will be able to purchase
shares at a price below market, without incurring broker's commissions, and will
be able to maintain their prorata share of the Company's equity.

     THE  OFFER,   WHICH  INCLUDES  THE  PRIMARY   SUBSCRIPTION   AND  THE  OVER
SUBSCRIPTION PRIVILEGE,  WILL EXPIRE AT 5:00 P.M. NEW YORK CITY TIME ON FEBRUARY
4, 1997 (the  "Expiration  Date").  Record  Date  Shareholders  who do not fully
exercise  their Rights should  expect,  upon  completion of the Offer,  to own a
smaller proportional interest in the Company than before the Offer.

     This  Prospectus  also relates to 105,013  Common Shares issued or issuable
upon the exercise of certain warrants. See "Warrants."

     The Common Shares are authorized for trading on the Nasdaq Small Cap Market
("Nasdaq")  under the symbol BTIM and are listed for trading on the Boston Stock
Exchange under the symbol BTM. The Rights will be transferable  and are approved
for trading on Nasdaq under the symbol BTIMR.

     The Company announced the Offer on December 5, 1996. The last reported sale
prices of a Common  Share on Nasdaq on December 5, 1996 and on January 9, 1997
were $21.00 and $26.50, respectively.

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

THESE  SECURITIES  INVOLVE A HIGH DEGREE OF RISK AND SHOULD BE PURCHASED ONLY BY
PERSONS WHO CAN AFFORD THE LOSS OF THEIR ENTIRE INVESTMENT.  SEE "RISK FACTORS."
                            -----------------------

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

================================================================================

                                 Price to              Proceeds to the
                                the Public               Company (1)
- --------------------------------------------------------------------------------
Per Share................... $ 20.00                  $ 20.00
- --------------------------------------------------------------------------------
Total (2)................... $ 5,662,180              $ 5,662,180
================================================================================

(1)  Before  deducting  expenses  of the  Offering  which  are  estimated  to be
$123,000. No underwriting discounts or commissions will be paid. 

(2) Assumes all of the Rights are exercised.  Does not include any proceeds that
may be received by the Company upon the exercise of certain warrants.

                 The date of this Prospectus is January 10, 1997


<PAGE>



     The Company is subject to the informational  requirements of the Securities
Exchange Act of 1934, as amended,  and in accordance therewith files reports and
other information with the Securities and Exchange  Commission.  Reports,  proxy
and  information  statements and other  information  filed by the Company can be
inspected  and  copied at the  public  reference  facilities  maintained  by the
Commission at 450 Fifth Street, N.W., Washington, D.C., at its New York Regional
Office at 7 World Trade Center,  Suite 1300, New York, New York,  10048,  and at
its Chicago  Regional  Office at 500 West Madison Street,  Suite 1400,  Chicago,
Illinois  60621-2511.  Copies of such  material can be obtained  from the Public
Reference Section of the Commission, Washington, D.C. 20549 at prescribed rates.

     The  Commission  maintains  a Web site  that  contains  reports,  proxy and
information  statements,  and other information  regarding registrants that file
electronically   with   the   Commission.   The   address   of   such   site  is
http://www.sec.gov.

     The Common  Shares of the Company are listed on the Boston Stock  Exchange.
Reports, proxy and information statements,  and other information concerning the
Company can be inspected at such Exchange.


     THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF
AN OFFER TO BUY,  COMMON  SHARES IN ANY  JURISDICTION  OR TO ANY PERSON IF IT IS
UNLAWFUL TO DO SO.




                                       -2-

<PAGE>



                               PROSPECTUS SUMMARY

     The  following  summary is qualified  in its entirety by the more  detailed
information and financial  statements  appearing elsewhere in this Prospectus or
in the documents incorporated by reference into this Prospectus.

                                   The Company

     BioTime,  Inc.  ("BioTime" or the "Company") is a development stage company
engaged in the research and  development  of aqueous based  synthetic  solutions
that can be used as plasma expanders,  blood substitutes during hypothermic (low
temperature)  surgery,  and organ  preservation  solutions.  These  products are
intended for several important medical  applications,  including:  the emergency
treatment   of  blood  loss  due  to   traumatic   injury  or  during   surgery;
cardio-pulmonary  bypass  surgery;  the  replacement  of very large volumes of a
patient's blood during cardiac surgery and  neurosurgery  that involve  lowering
the patient's body temperature to hypothermic  levels;  the preservation of body
organs and tissues awaiting transplant;  cancer treatment;  and other biomedical
applications.  Because the Company's solutions are synthetic,  rather than human
blood by-products,  use of the solutions would not pose the risk of transmitting
AIDS, hepatitis or other blood borne infectious diseases,  and would not have to
be matched to a patient's blood type.

     The Company's  first two blood volume  replacement  products are Hextend(R)
and  PentaLyte.TM  Hextend and PentaLyte are composed of different  hydroxyethyl
starches,  but  include  the same  electrolytes,  sugar and  buffer.  Hextend is
presently being tested in clinical studies to treat  hypovolemia  (loss of blood
volume)   during   surgery,   while  the   Company  is   continuing   to  gather
pharmacological  data on  PentaLyte  through  laboratory  studies.  The  Company
believes  that  a  solution  that  sustains  the  patient's   fluid  volume  and
physiological balance, thereby maintaining tissue and organ function, can reduce
or eliminate the need for supplemental whole blood and blood plasma.  Based upon
the results of its laboratory research,  the Company has determined that in many
emergency care and surgical applications it is not necessary for the solution to
include special oxygen carrying molecules to replace red blood cells. Therefore,
the Company has devoted its efforts to the development of  formulations  that do
not  rely  upon the use of  recombinant  DNA or other  complex  technologies  to
synthesize  and assimilate  into solution  costly and  potentially  toxic oxygen
carrying molecules such as hemoglobin and perfluorocarbons.

     The Company is presently  conducting a Phase III clinical trial of Hextend.
The clinical  trial will involve  approximately  150 patients and is designed to
test  whether  the use of Hextend can improve  patient  outcomes by  maintaining
organ perfusion and preventing the adverse effects of hypovolemia (loss of blood
volume)  during  surgery.  Hextend  will be  tested  in a  variety  of  surgical
procedures  that often involve a large amount of blood loss, such as orthopedic,
gynecologic,  urologic and  gastro-intestinal  surgery.  The trials began during
October 1996 and are being conducted at


                                       -3-

<PAGE>



the Duke  University  Medical Center in Durham,  North Carolina and at Mt. Sinai
Hospital and Mt. Sinai School of Medicine in New York,  New York. The trials are
proceeding in accordance with the Company's  expectations.  Although BioTime has
conducted  pharmacology  and toxicology  testing of Hextend,  and has compiled a
significant  amount of data  demonstrating the safety and efficacy of Hextend in
laboratory testing using animal subjects,  the outcome of human trials cannot be
predicted with certainty.



     If the clinical trials of Hextend are successful,  the Company will have to
prepare a New Drug Application for Food and Drug Administration ("FDA") approval
to  manufacture  and market  the new  product.  In order to  complete a New Drug
Application,  the Company will have to obtain the means of producing  Hextend in
compliance with FDA "good manufacturing practices."

     To address its anticipated need for manufacturing and marketing  resources,
BioTime is presently negotiating with major pharmaceutical companies that, based
upon their current product lines and resources,  will be able to manufacture and
market  BioTime's  products if and when the necessary  regulatory  approvals are
obtained. In regard to these negotiations,  BioTime and the representatives of a
major pharmaceutical company are approaching agreement on the general terms of a
manufacturing and marketing arrangement for certain BioTime products.

     The Company was  incorporated  under the laws of the State of California on
November  30,  1990.  The  Company's  principal  office is located at 935 Pardee
Street, Berkeley, California 94710. Its telephone number at such office is (510)
845-9535.



                                       -4-

<PAGE>




                                  The Offering

Securities Offered................................ The Company is issuing to its
                         shareholders of record,  including beneficial owners of
                         shares  held in the name of Cede & Co. as  nominee  for
                         The  Depository  Trust  Company  or in the  name of any
                         other    depository    or   nominee    ("Record    Date
                         Shareholders"), as of the close of business on December
                         27,  1996  (the  "Record   Date")   rights   ("Rights")
                         entitling  the  holders  thereof to  subscribe  for and
                         purchase up to an aggregate of 283,109  common  shares,
                         no par value ("Common  Shares"),  of the Company.  Each
                         Record Date Shareholder will receive one Right for each
                         Common  Share  owned on the  Record  Date,  and will be
                         entitled to subscribe for and purchase from the Company
                         one new  Common  Share for every ten  Rights  held (the
                         "Primary Subscription"). The Rights may be exercised at
                         any  time  during  the   Subscription   Period,   which
                         commences on January 10, 1997 and ends at 5:00 p.m.New
                         York time on February 4, 1997 (the "Expiration Date").

Subscription Price.............................. The   subscription  price  per
                         Common  Share  (the   "Subscription   Price")  will  be
                         $20.00.


Over-Subscription 
Privilege......................................... Record Date  Shareholders who
                         fully  exercise  their  Rights  will be entitled to the
                         additional privilege of subscribing for and purchasing,
                         subject  to   certain   limitations   and   subject  to
                         allocation,  any Common  Shares not  acquired  by other
                         holders of Rights  through the  exercise of such Rights
                         (the   "Over-Subscription    Privilege").    See   "The
                         Offer--Over- Subscription Privilege"


How to Exercise Rights  ........................ The Rights will be evidenced by
                         Subscription  Certificates,  which will be  distributed
                         distributed  to Record  Date  Shareholders,  and may be
                         exercised by completing  the  Subscription  Certificate
                         and  delivering  it,   together  with  payment  of  the
                         Subscription Price, to the Subscription Agent, American
                         Stock  Transfer & Trust  Company,  40 Wall Street,  New
                         York,  New York  10005.  Payment  may be made either by
                         check drawn on a United  States  bank,  or by notice of
                         guaranteed  delivery (as  explained  under "The Offer--
                         Payment for Shares"). Rights must be exercised no later
                         than  the  Expiration  Date.  Rights  holders  may  not
                         rescind a purchase after exercising their Rights.

                                      -5-
<PAGE>


Sale   of   Rights     ..........................................The Rights are
                         transferable  until  the  last  Business  Day  prior to
                         the Expiration Date. A Business Day is a day on which 
                         Nasdaq trades. The Rights are authorized for trading on
                         Nasdaq.Trading of the Rights will be conducted  on  a
                         regular-way basis from January 14, 1997 through the 
                         last Business Day prior to the Expiration  Date. Any
                         commissions in connection with the sale of Rights will
                         be paid by the selling Rights holder. The Company and 
                         the Subscription Agent cannot assure that a market for
                         the Rights will develop, or the prices at which Rights
                         may be sold if a market does develop.

Foreign Restrictions..............................Subscription Certificates will
                         not  be  mailed  to  Record  Date  Shareholders   whose
                         addresses  of record  are  outside  the  United  States
                         ("Foreign  Record  Date  Shareholders").  The Rights to
                         which such  Subscription  Certificates  relate  will be
                         held by the Subscription  Agent for such Foreign Record
                         Date  Shareholders'  accounts  until  instructions  are
                         received to exercise,  sell or transfer the Rights.  If
                         no instructions are received by 5:00p.m., New York time
                         on January 30, 1997 (three  Business  Days prior to the
                         Expiration  Date), the Subscription  Agent will use its
                         best efforts to sell the Rights of such Foreign  Record
                         Date Shareholders.  The net proceeds, if any, from such
                         a sale will be  remitted  to the  Foreign  Record  Date
                         Shareholders   on  a   pro   rata   basis.   See   "The
                         Offer--Foreign Shareholders."


Important Dates to
Remember.................................Record Date:          December 27, 1996
                                         Expiration Date:       February 4, 1997


Amendment, Extension or
Termination of the Offer..............................The  Company  reserves the
                         right,  in its  sole  discretion,  to:(a)terminate  the
                         Offer prior to delivery of the Common  Shares for which
                         Rights holders have subscribed pursuant to the exercise
                         of  Rights   in  the   Primary   Subscription   or  the
                         Oversubscription  Privilege; (b) extend the Termination
                         Date to a later date;  (c) change the Record Date prior
                         to the distribution of the Rights to  shareholders;  or
                         (d) amend or modify the terms of the Offer.

                                       -6-

<PAGE>



Risk Factors.........................................An investment in the Common
                         Shares  involves  a high  degree  of risk.  The  Common
                         Shares  should be purchased  only by investors  who can
                         afford the loss of their entire  investment.  See "Risk
                         Factors."


Use of Proceeds............................................ To finance Phase III
                         clinical trials of Hextend; to finance further research
                         and development of Hextend, Pentalyte and other BioTime
                         products;   and  for  working  capital.   See  "Use  Of
                         Proceeds."


Nasdaq Symbol.......................................The Common Shares are traded
                         under the symbol  "BTIM" and the Rights are authorized
                         for trading under the symbol "BTIMR."


Boston Stock Exchange Symbol........................The Common Shares are traded
                         under the symbol "BTM."


Trade Marks..........................................Hextend(R) and PentaLyteTM 
                         are trademarks of BioTime.



                                       -7-

<PAGE>



                                  RISK FACTORS

     AN  INVESTMENT  IN THE COMMON  SHARES  INVOLVES A HIGH DEGREE OF RISK.  THE
COMMON SHARES SHOULD BE PURCHASED ONLY BY INVESTORS WHO CAN AFFORD TO LOSE THEIR
ENTIRE INVESTMENT.  BEFORE DECIDING TO PURCHASE ANY OF THE COMMON SHARES OFFERED
HEREBY,  PROSPECTIVE  INVESTORS  SHOULD  CONSIDER THE FOLLOWING  FACTORS,  AMONG
OTHERS SET FORTH HEREIN,  WHICH COULD  MATERIALLY  ADVERSELY AFFECT THE PROPOSED
OPERATIONS  AND  PROSPECTS OF THE COMPANY AND THE VALUE OF AN  INVESTMENT IN THE
COMPANY.

Development Stage Company

     The Company is in the development stage, and, to date, has been principally
engaged in research and development activities.  The Company has not generated a
significant  amount of operating  revenue and at September 30, 1996, the Company
had incurred  operating losses of $8,782,827  since  inception.  The Company has
incurred additional losses since that date, and as a result of the developmental
nature  of its  business  can be  expected  to  sustain  substantial  additional
operating  losses.  The  likelihood  of the  success  of  the  Company  must  be
considered  in  light  of  the  expenses,  difficulties  and  delays  frequently
encountered by a business engaged in the research,  development,  production and
marketing of new products and  technologies  utilizing new and unproven  methods
and which may require many years and substantial expenditures to complete. There
can  be no  assurance  that  the  Company  will  be  successful  in  developing,
manufacturing  or marketing  (directly or through third parties) any products or
technology.  Even if the Company is able to successfully develop new products or
technologies,  there  can  be  no  assurance  that  the  Company  will  generate
sufficient revenues from the sale or licensing of such products and technologies
to be profitable.

No Assurance of Exercise of Rights; Additional Financing Required

     The number of Rights that will be exercised by Rights  holders in the Offer
cannot be  presently  determined.  Accordingly,  the amount of  proceeds  to the
Company from the Offer is uncertain.  Officers,  directors and certain financial
consultants of the Company, who own in the aggregate 607,330 Common Shares, have
informed  the Company  that they intend to exercise  the Rights  distributed  to
them, provided that they can obtain sufficient  financing for such purpose,  but
they are not legally bound to do so.

     The Company believes that, if all of the Rights are exercised (which cannot
be assured), the proceeds from the Offer and its cash on hand will be sufficient
to permit the Company to  continue in  operation  for  approximately  24 months.
Additional  financing  may  be  required  for  continued  research  and  product
development,  additional  clinical  trials of new products,  and  production and
marketing of Hextend and any other Company  products that may be approved by the
FDA or foreign regulatory  authorities.  Because of the developmental  nature of
the  Company's  business,  it is highly  unlikely  that in the near  future  the
Company will be able to generate  internally the funds necessary to carry on its
planned operations. It often takes many

                                       -8-

<PAGE>



months  for the FDA to  complete  its  review  of a New Drug  Application  after
clinical trials are complete and it can take several months for a pharmaceutical
company to introduce a new drug to the market.  Therefore, the Company will need
to raise  capital from time to time to meet its  operating  expenses  until such
time as it is  able to  generate  sufficient  revenues  from  product  sales  or
royalties.  There can be no  assurance  that the  Company  will be able to raise
additional  funds on favorable  terms or at all, or that such funds,  if raised,
will be  sufficient  to permit the Company to develop  and market its  products.
Unless the Company is able to raise additional  funds when needed,  it is likely
that it will be unable to continue its planned  activities,  notwithstanding the
progress of its research and development projects.

Uncertainty as to Results of Research and Development; Unproven Products

     The Company's business involves the attempt to develop new medical products
and technologies.  Such experimentation is inherently costly, time consuming and
uncertain as to its results.  If the Company is  successful  in developing a new
technology  or  product,  refinement  of  the  new  technology  or  product  and
definition of the practical  applications  and  limitations of the technology or
product may take years and require the expenditure of large sums of money.  From
the date of the Company's  inception  through  September  30, 1996,  the Company
spent  $5,205,194  on  research  and  development,  and the  Company  expects to
continue  to incur  substantial  research  and  development  expenses.  Clinical
testing of Hextend must be successfully completed and governmental approval must
be obtained prior to commercialization, and the Company's other plasma expander,
blood  substitute  and organ  preservation  solutions  will require  significant
laboratory  testing  and  development  before  applications  for  permission  to
commence  clinical  testing can be filed with the FDA. There can be no assurance
that the Company's  products will prove to be safe and  efficacious  in clinical
trials,  be  produced in  commercial  quantities  at  reasonable  prices,  or be
successfully marketed.

Uncertainty as to Human Application of Products

     Clinical trials of Hextend in human patients have only recently begun,  and
the Company's other experimental products and technologies have not been applied
in human  medicine  and have only been used in  laboratory  studies on  animals.
There is no assurance that the Company will be successful in developing products
and technologies for human medical procedures.

Uncertainty of Future Sales

     The Company's  ability to generate  substantial  operating  revenue depends
upon its  success  in  developing  and  marketing  its  plasma  expander,  blood
substitute,  and organ  preservation  products.  Due to the high  degree of risk
associated with the application of new technologies and products in the field of
human medicine, the acceptance of the Company's products and technologies by the
medical profession may take time to develop.  There can be no assurance that any
products that receive FDA or foreign  regulatory  approval will be  successfully
marketed or that the Company will receive sufficient revenues from product sales
to meet its operating expenses.


                                       -9-

<PAGE>



FDA and Other Regulatory Approvals Required

     Preclinical  and  clinical  trials  and   manufacturing  and  marketing  of
BioTime's  medical products will be subject to the rigorous testing and approval
processes  of the FDA and  corresponding  foreign  regulatory  authorities.  The
regulatory  process,  which  includes  preclinical,  clinical and  post-clinical
testing of each product to establish its safety and  efficacy,  can take several
years to complete and require the  expenditure  of  substantial  time and funds.
Data  obtained from  preclinical  and clinical  activities  are  susceptible  to
varying  interpretations  which could  delay,  limit or prevent  FDA  regulatory
approval.  In addition,  delays or rejections  may be encountered as a result of
changes  in FDA  policy  during  the  period  of  product  development  and  FDA
regulatory review of each submitted new product application.  Similar delays may
also be encountered in foreign  countries.  There can be no assurance that, even
after substantial  expenditures of time and money,  regulatory  approval will be
obtained for any products developed by the Company. Moreover, even if regulatory
approval of a product is granted,  such approval may entail  limitations  on the
indicated uses for which the product may be marketed.  After regulatory approval
is obtained,  the  approved  product,  the  manufacturer  and the  manufacturing
facilities are subject to continual review and periodic inspections, and a later
discovery  of  previously  unknown  problems  with a  product,  manufacturer  or
facility may result in restrictions on such product or  manufacturer,  including
withdrawal of the product from the market. Failure to comply with the applicable
regulatory requirements can, among other things, result in fines, suspensions of
regulatory  approvals,  product  recalls,  operating  restrictions  and criminal
prosecution.  Additional  government  regulation may be established  which could
prevent or delay regulatory approval of the Company's products.

Availability of Raw Materials

     Although most  ingredients in the products  being  developed by the Company
are readily  obtainable from multiple  sources,  the Company knows of only a few
manufacturers of the hydroxyethyl  starches that serve as the active  ingredient
in Hextend and PentaLyte.  Accordingly, the Company and pharmaceutical companies
that may produce  BioTime  products under a license may face shortages of supply
of the raw materials necessary to manufacture one or more of its products.

Absence of Manufacturing and Marketing Capabilities

     In order to obtain FDA approval for the sale of Hextend and other products,
the Company will be required to conduct a portion of its  clinical  trials using
solutions manufactured under "good manufacturing practices" required by the FDA.
If any of the Company's  products receive FDA approval,  such products will then
have  to be  manufactured  in  compliance  with  applicable  federal  and  state
regulatory requirements,  in commercial quantities and at an acceptable cost and
with sufficient  stability to withstand the  distribution  process.  The Company
presently  does not have  adequate  facilities or resources to  manufacture  its
products  in  commercial   quantities  or  in  compliance  with  FDA  standards.
Accordingly,  the  Company  plans to enter  into  arrangements  with one or more
pharmaceutical  companies  for the  production  and  marketing of the  Company's
products.  The limited number of manufacturers capable of providing hydroxyethyl
starch, and

                                       -10-

<PAGE>



the limited  financial  resources  of the  Company,  could affect the terms that
Company may obtain for licensing its products.  If such  arrangements  cannot be
made on  acceptable  terms,  the Company  would then be required to construct or
acquire  its own  manufacturing  facilities  and  establish  its  own  marketing
organization,  which would entail significant expenditures of time and money. No
assurance can be given that the Company will be successful in the  establishment
of contractual  relationships with pharmaceutical  companies for the manufacture
and  marketing  of the  Company's  products,  or,  alternatively,  in  obtaining
sufficient  capital for the establishment of its own manufacturing and marketing
capabilities.

Competition

     There are other companies and academic  institutions  that are seeking,  or
may  seek,  to  develop  products  that may be  competitive  with the  Company's
proposed  products.   Many  of  these  competitors  have  substantially  greater
financial,  technical,  research,  clinical,  production and marketing resources
than the Company.  The Company's  competitors may succeed in developing products
that are safer or more  effective  than those of the  Company or that obtain FDA
approval in less time than the Company's products.  Developments by others could
render the Company's products and technologies obsolete or noncompetitive.

Uncertainty of Patent Protection

     The Company has obtained patents in the United States, and has filed patent
applications  in certain  foreign  countries,  for certain  products,  including
Hextend and PentaLyte.  No assurance can be given that any foreign  patents will
be issued to the Company,  or that,  if issued,  those patents and the Company's
United  States  patents  will  provide  the  Company  with   meaningful   patent
protection,  or that  others will not  successfully  challenge  the  validity or
enforceability of any patent issued to the Company. The costs required to uphold
the validity and prevent  infringement of any patent issued to the Company could
be substantial, and the Company might not have the resources available to defend
its patent rights.

Uncertainty of Health Care Reimbursement and Reform

     The Company's ability to successfully commercialize its products may depend
in part on the extent to which  reimbursement  for the cost of such products and
related  treatment  will be  available  from  government  health  administration
authorities,   private  health  coverage   insurers  and  other   organizations.
Significant  uncertainty exists as to the pricing,  availability of distribution
channels and  reimbursement  status of newly  approved  health care products and
there can be no assurance  that adequate  third party coverage will be available
to enable the Company to maintain price levels  sufficient for realization of an
appropriate return on its investment in product development.  In certain foreign
markets,  pricing  or  profitability  of health  care  products  is  subject  to
government  control.  In the United States,  there have been a number of federal
and state proposals to implement similar government controls,  and new proposals
are likely to be made in the future.


                                      -11-

<PAGE>



Potential Disputes Over Ownership of Technology

     Because  certain  officers and  directors of the Company were  employees of
Cryomedical  Sciences,  Inc.  ("CMSI")  prior to  founding  the  Company,  it is
possible   that  CMSI  might  claim  an  ownership   interest  in  products  and
technologies developed by the Company based upon the scope of research conducted
by such  persons  while they were  employed by CMSI,  or based upon the terms of
certain  agreements  between  such  scientists  and  CMSI  with  respect  to the
ownership of technology and products. To date, no such claims have been asserted
against  the Company by CMSI.  CMSI holds  patents  with  respect to certain low
temperature blood substitute solutions. No assurance can be given that CMSI will
not claim that the Company's products infringe upon CMSI's patents.  The Company
has obtained a non-exclusive license to use certain experimental low temperature
blood substitute  solutions  developed by CMSI. The license is not assignable or
transferable  and  is  subject  to  termination  under  certain   circumstances,
including a sale of control of the  Company.  However,  the Company is no longer
using,  and does  not  intend  to  pursue  the  commercialization  of,  the CMSI
solutions.

Dependence Upon Key Personnel

     The Company depends to a considerable  degree on the continued  services of
Dr. Paul Segall,  Dr. Hal Sternberg  and Dr. Harold Waitz.  Although the Company
maintains key man life  insurance in the amount of $1,000,000 on the life of Dr.
Segall,  the loss of the  services  of any of  these  individuals  could  have a
material adverse effect on the Company. In addition,  the success of the Company
will depend, among other factors,  upon successful  recruitment and retention of
additional highly skilled and experienced management and technical personnel.

No Dividends

     The  Company  has not paid any  dividends  on its  Common  Shares.  For the
foreseeable  future  it is  anticipated  that  earnings,  if any,  which  may be
generated  from the Company's  proposed  operations  will be used to finance the
growth of the  Company  and that cash  dividends  will not be paid to holders of
Common Shares.

Possible Volatility of Market for Common Shares

     The Common  Shares are traded on Nasdaq and on the Boston  Stock  Exchange.
The market  price of the Common  Shares,  like that of the common  stock of many
biotechnology  companies, has been highly volatile. The price of such securities
may rise  rapidly in response to certain  events,  such as the  commencement  of
clinical  trials of an  experimental  new drug, even though the outcome of those
trials and the likelihood of ultimate FDA approval remains uncertain. Similarly,
prices  of  such  securities  may  fall  rapidly  if  unfavorable   results  are
encountered in clinical trials or if FDA approval is not obtained or is delayed.
In the event  that the  Company  achieves  earnings  from the sale of  products,
securities analysts may begin predicting quarterly earnings.  The failure of the
Company's earnings to meet analysts'  expectations could result in a significant
rapid decline in the market price of the Company's  Common Shares.  In addition,
the stock market has experienced  and continues to experience  extreme price and
volume

                                      -12-

<PAGE>



fluctuations  which have  affected the market price of the equity  securities of
many  biotechnology  companies  and  which  have  often  been  unrelated  to the
operating  performance of these companies.  Such broad market  fluctuations,  as
well as general  economic and political  conditions,  may  adversely  affect the
market price of the Common Shares.

Requirements for Continued Listing of Securities on Nasdaq

     The  Company's  Common  Shares are traded on Nasdaq and on the Boston Stock
Exchange.  Both Nasdaq and the Boston Stock  Exchange  have  adopted  rules that
establish  criteria for initial and continued  listing of securities.  Under the
Nasdaq rules for continued  listing, a company must maintain at least $2,000,000
in total  assets,  at least  $1,000,000  in net worth and a minimum bid price of
$1.00 per share.  The NASD has proposed new rules for continued  Nasdaq  listing
that, if adopted, would require a Nasdaq listed company to maintain net tangible
assets  of  at  least  $2,000,000,  or  a  market  capitalization  of  at  least
$35,000,000, or to have earned net income of at least $500,000 during two of the
last three years. Under the proposed new rules, a listed company would also have
to maintain a public float of at least 500,000  shares with a market value of at
least  $1,000,000,  and a  minimum  bid price of $1.00  per  share.  There is no
assurance that future losses from  operations will not cause the Company's total
assets,  net worth, net tangible  assets,  or market  capitalization  to decline
below the current or proposed  criteria in the future.  If the Common Shares are
delisted by Nasdaq,  trading in the Common Shares would  thereafter be conducted
on the Boston Stock Exchange and in the over-the-counter market on an electronic
bulletin board  established  for securities  that do not meet the Nasdaq listing
requirements.  The Common  Shares  could also be  delisted  on the Boston  Stock
Exchange  if the  Company  fails to  maintain  $1,000,000  in total  assets  and
$500,000 in shareholders'  equity.  As a result,  an investor could find it more
difficult to dispose of, or to obtain  accurate  quotations  as to the price of,
the Common Shares.

     In addition,  if the Common Shares were delisted from Nasdaq, they would be
subject to the so-called penny stock rule that imposes additional sales practice
requirements  on  broker-dealers  who sell such securities to persons other than
established customers and accredited investors (generally defined as an investor
with a net worth in excess of $1,000,000 or individual  annual income  exceeding
$200,000,  or  joint  annual  income  with a  spouse  exceeding  $300,000).  For
transactions  covered  by this  rule,  the  broker-dealer  must  make a  special
suitability   determination  for  the  purchaser  and  must  have  received  the
purchaser's  written  consent to the  transaction  prior to sale.  Consequently,
delisting,  if it  occurred,  could affect the ability of  shareholders  to sell
their Common Shares in the secondary market.

     The  Securities  and Exchange  Commission  (the  "Commission")  has adopted
regulations  that define a "penny  stock" to be any equity  security  that has a
market price (as  defined) of less than $5.00 per share or an exercise  price of
less than $5.00 per share,  subject to certain  exceptions.  For any transaction
involving a penny stock, unless exempt, the rules require the delivery, prior to
the transaction,  of a disclosure  schedule  relating to the penny stock market.
The  broker-dealer  also  must  disclose  the  commissions  payable  to both the
broker-dealer  and the  registered  representative,  current  quotations for the
securities and, if the broker-dealer is the sole market-maker, the broker-dealer
must disclose this fact and the broker-dealer's presumed control

                                      -13-

<PAGE>



over the market.  Finally,  monthly  statements must be sent  disclosing  recent
price information for the penny stock held in the account and information on the
limited market in penny stocks.

     Boston Stock  Exchange  and Nasdaq  listed  securities  are exempt from the
definition of "penny stock" for most  purposes,  except that  transactions  in a
Nasdaq-listed  security  having a market  price of less than $5.00 per share are
exempt  from all but the sole  market-maker  provision  only for (i) issuers who
have  $2,000,000 in tangible  assets  ($5,000,000  if the issuer has not been in
continuous  operation for three years),  (ii) transactions in which the customer
is an institutional  accredited  investor,  and (iii)  transactions that are not
recommended by the broker-dealer.  In addition,  transactions in a Nasdaq listed
security  directly  with a  Nasdaq  market-maker  for such  securities  would be
subject  only to the  sole  market-maker  disclosure,  and the  disclosure  with
respect  to  commissions  to be paid  to the  broker-dealer  and the  registered
representative.

     Finally, all Nasdaq-listed  securities would be exempt if Nasdaq raised its
requirements for continued  listing so that any issuer with less than $2,000,000
in net tangible  assets or  shareholders'  equity would be subject to delisting.
These  criteria  are  more   stringent  than  the  current  Nasdaq   maintenance
requirements.

Shares Eligible for Future Sale

     Sale of  substantial  additional  amounts  of Common  Shares in the  public
market  could have an  adverse  effect on the price of the  Common  Shares.  The
Company had 2,831,084 Common Shares issued and outstanding on December 27, 1996,
of which 2,243,122 shares are presently freely transferable  without restriction
under the  Securities  Act of 1933,  as amended  (the "Act").  In addition,  the
Common  Shares  issued  upon the  exercise  of the  Rights  will  also be freely
transferable  without restriction under the Act. Of the remaining 587,962 Common
Shares  outstanding at such date, 29,013 shares are being offered for sale under
this  prospectus  (See  "Warrants"),  and 558,949 Common Shares are eligible for
sale under Rule 144 under the Act. The  additional  76,000 shares  issuable upon
the exercise of certain  warrants  described in this prospectus under "Warrants"
will also be freely tradeable.

Broad Discretion on Use of Proceeds

     Management of the Company will have broad discretion in determining the use
to which the net proceeds of the Offer will be put.


                                      -14-

<PAGE>



                                    THE OFFER

Terms of the Offer

     The Company is issuing to Record Date Shareholders  Rights to subscribe for
Common  Shares.  Each Record Date  Shareholder  will be issued one  transferable
Right for each Common Share owned on the Record Date. No fractional  Rights will
be issued. The Rights entitle the holders thereof to acquire at the Subscription
Price one Share for each ten Rights  held.  Any Record Date  Shareholder  who is
issued fewer than ten Rights may subscribe,  at the Subscription  Price, for one
full Share. The Rights are evidenced by Subscription  Certificates which will be
mailed to Record Date  Shareholders  other than Record Date  Shareholders  whose
record  addresses  are  outside the United  States  (including  the  District of
Columbia,    U.S.   territories   and   possessions)   ("Foreign   Record   Date
Shareholders").

     Completed  Subscription  Certificates  may be delivered to the Subscription
Agent at any time during the Subscription Period, which commences on the date of
this  Prospectus and ends at 5:00p.m.,  New York City time, on February 4, 1997,
(the "Expiration  Date").  All Rights may be exercised  immediately upon receipt
and until 5:00 p.m. on the Expiration Date.

     Any Record Date Shareholder who fully exercises all Rights initially issued
to him (other than those Rights which cannot be exercised because they represent
the right to acquire less than one Common  Share) is entitled to  subscribe  for
Common Shares which were not otherwise subscribed for by other Rights holders in
the  Primary  Subscription  (the  "Over-Subscription  Privilege").  Record  Date
Shareholders   such   as   broker-dealers,   banks,   and   other   professional
intermediaries  who hold shares on behalf of  clients,  may  participate  in the
Over-Subscription  Privilege  for a client if the  client  fully  exercises  all
Rights  attributable  to him. For purposes of determining  the maximum number of
Shares a Rights holder may acquire pursuant to the Offer,  broker-dealers  whose
Common  Shares  are  held of  record  by  Cede & Co.  ("Cede")  or by any  other
depository  or nominee  will be deemed to be the  holders of the Rights that are
issued to Cede or such  other  depository  or nominee  on their  behalf.  Common
Shares acquired  pursuant to the  Over-Subscription  Privilege may be subject to
allotment,   which  is  more  fully  discussed  below  under  "Over-Subscription
Privilege".

     Rights will be evidenced by Subscription  Certificates (see Appendix A) and
may be exercised by completing a  Subscription  Certificate  and  delivering it,
together with payment,  either by means of a notice of guaranteed  delivery or a
check, to the  Subscription  Agent.  The method by which Rights may be exercised
and Shares paid for is described  below in "Exercise of Rights" and "Payment for
Shares".  A Rights holder who  exercises  Rights will have no right to rescind a
purchase  after the  Subscription  Agent has received  payment.  See "Payment of
Shares"  below.  Common Shares issued  pursuant to an exercise of Rights will be
authorized  for  trading  on  Nasdaq  and will be  listed  on the  Boston  Stock
Exchange.

     The  Rights  are  transferable  until  the  Expiration  Date and have  been
admitted for trading on Nasdaq.  Assuming a market for the Rights develops,  the
Rights may be purchased and sold through usual brokerage  channels.  Although no
assurance can be given that a market

                                      -15-

<PAGE>



for the Rights will  develop,  trading in the Rights may be conducted  until and
including the close of trading on the last Business Day prior to the  Expiration
Date.  The method by which Rights may be transferred is set forth below in "Sale
of  Rights".   Because  fractional  shares  will  not  be  issued,  Record  Date
shareholders  who receive fewer than ten Rights will be entitled to purchase one
Common Share.  Record Date Shareholders who, after exercising their Rights,  are
left with fewer  than ten  Rights,  will be unable to  exercise  such  remaining
Rights and will not be  entitled to receive any cash from the Company in lieu of
such remaining Rights.

     The Rights issued to Foreign Record Date  Shareholders  will be held by the
Subscription  Agent  for such  shareholders'  accounts  until  instructions  are
received  to  exercise  (if  permissible  under  applicable   foreign  or  state
securities  laws),  sell, or transfer the Rights.  If no instructions  have been
received  by 12:00 noon,  New York City time,  three Business  Days prior to the
Expiration  Date, the  Subscription  Agent will use its best efforts to sell the
Rights of those Foreign  Record Date  Shareholders  on Nasdaq.  The net proceeds
from the sale of those  Rights  will be  remitted  to the  Foreign  Record  Date
Shareholders. See "Sale of Rights".

     Officers,  directors,  and certain financial consultants of the Company who
own, in the aggregate 607,330 Common Shares, have informed the Company that they
intend to  purchase  in the  Primary  Subscription  up to 60,733  Common  Shares
through the exercise of Rights  distributed to them in the Offer,  provided that
suitable  financial  arrangements can be made, but they are not legally bound to
do so. Any Common  Shares so acquired by officers,  directors  and other persons
who  are  "affiliates"  of the  Company,  as  that  term is  defined  under  the
Securities Act of 1933, as amended (the  "Securities  Act"), may only be sold in
accordance  with Rule 144 under the  Securities  Act or pursuant to an effective
registration  statement under the Securities Act. In general, under Rule 144, as
currently in effect,  an "affiliate" of the Company is entitled to sell,  within
any three-month  period,  a number of shares that does not exceed the greater of
1% of the then-outstanding  Common Shares or the average weekly reported trading
volume of the Common Shares during the four calendar weeks  preceding such sale.
Sales under Rule 144 are also subject to certain  restrictions  on the manner of
sale,  to  notice  requirements  and  to  the  availability  of  current  public
information about the Company.

Purpose of the Offer

     The Board of Directors of the Company has  determined  that it is necessary
for the  Company  to  raise  additional  capital  at this  time to  finance  its
operations,  including the costs of conducting its Phase III clinical  trials of
Hextend, other costs associated with seeking FDA approval of Hextend,  continued
research and product development,  and general and administrative  expenses. The
Offer  provides the Company with the  opportunity  to raise  additional  capital
without diluting the ownership  interests of existing  shareholders who exercise
their  Rights,  and  without  paying  underwriting   commissions  and  expenses.
Shareholders  who  exercise  their  Rights in the Offer will be able to purchase
shares at a price below market, without incurring broker's commissions, and will
be  able  to  maintain  their  prorata  share  of  the  Company's  equity.   The
distribution  of the Rights to Record Date  Shareholders  will also afford those
Record Date  Shareholders  who choose not to exercise their Rights the potential
of receiving a cash payment upon the sale of such Rights. Therefore, the receipt
of Rights by Record Date Shareholders who chose not to

                                      -16-

<PAGE>



exercise their Rights may be viewed as compensation for the possible dilution of
their interest in the Company.

     The Company  considered other financing  alternatives,  including a private
placement or an overseas sale of newly issued shares.  Those  alternatives would
have entailed the payment of commissions  and fees to  broker-dealers  and would
also have been dilutive to the Company's  shareholders  because the shares would
have been sold to new investors at a discount to market. In contrast,  the Offer
will permit the Company to raise capital without paying  commissions and fees to
broker-dealers  and will permit the  shareholders  who exercise  their Rights to
enjoy the  price  discount  that  might  otherwise  have  been  realized  by new
investors.

     Another  purpose  of the Offer is to raise  sufficient  capital to meet the
criteria for the continued  listing of the Company's Common Shares on Nasdaq. At
September 30, 1996,  the Company had $2,019,144 of cash on hand and total assets
of  $2,539,346.  If the  Company's  total assets  decline  below the  $2,000,000
minimum  required by Nasdaq,  the Common Shares could be delisted.  The NASD has
proposed new rules for continued Nasdaq listing that, if adopted,  would require
the Company to maintain net  tangible  assets  (rather than total  assets) of at
least $2,000,000.  Although the net tangible asset test of the proposed rules is
more  stringent  than the current  total asset test,  the  proposed  rules would
permit the continued  listing of the Company's  Common Shares  without regard to
the amount of its assets as long as the Company's  market  capitalization  is at
least $35,000,000. If the Company's Common Shares were delisted from Nasdaq, the
Common Shares would  continue to be listed on the Boston Stock  Exchange so long
as the Company maintains  $1,000,000 of assets.  However,  delisting from Nasdaq
could adversely  affect the market price and liquidity of the Common Shares,  to
the detriment of  shareholders.  See "Risk  Factors--Requirements  for Continued
Listing of Securities on Nasdaq."


The Subscription Price

     The  Subscription  Price for the Common Shares to be issued pursuant to the
Rights is $20.00.

     The Company announced the Offer on December 5, 1996. The last reported sale
price of the Common  Shares on Nasdaq on December 5, 1996 and January 9, 1997,
was $21.00 and $26.50, respectively.

Expiration of the Offer

     The Offer will  expire at 5:00 p.m.,  New York City  time,  on  February 4,
1997, the Expiration Date. Rights will expire on the Expiration Date and may not
be exercised after that date.


                                      -17-

<PAGE>



Exercise of Rights

     Rights may be  exercised  by filling in and signing the reverse side of the
Subscription Certificate which accompanies this Prospectus and mailing it in the
envelope provided, or otherwise delivering the completed and signed Subscription
Certificate  to the  Subscription  Agent,  together  with payment for the Common
Shares as described  below under  "Payment for Shares".  Properly  completed and
executed  Subscription  Certificates must be received by the Subscription  Agent
prior to 5:00 p.m., New York City time, on the Expiration  Date (unless  payment
is effected by means of a notice of guaranteed delivery as described below under
"Payment  for Shares") at the offices of the  Subscription  Agent at the address
set forth below.  Rights may also be exercised through a broker,  who may charge
the exercising  Rights holder a servicing fee. A Record Date  Shareholder who is
issued fewer than ten rights may subscribe,  at the Subscription  Price, for one
full  Common  Share.  Fractional  shares  will not be issued,  and  Record  Date
Shareholders  who, upon  exercising  their Rights,  are left with fewer than ten
Rights will not be able to exercise such remaining Rights.

     Signed   Subscription   Certificates,   accompanied   by   payment  of  the
Subscription  Price,  should be sent to American  Stock Transfer & Trust Company
(the "Subscription Agent"), by one of the methods described below:

(1)  BY MAIL OR BY HAND:

     American Stock Transfer & Trust Company
     40 Wall Street, 46th Floor
     New York, New York 10005

(2)  BY EXPRESS MAIL OR OVERNIGHT COURIER:

     American Stock Transfer & Trust Company
     Corporate Stock Transfer Department
     40 Wall Street
     New York, New York 10005

(3)  BY FACSIMILE (TELECOPIER):

     (718) 236-4588 or (718) 234-5001
     With a copy of the original  Subscription  Certificate to be sent by one of
     the methods  described  above.  Confirm  facsimile  by  telephone  to (212)
     921-8200.

              DO NOT SEND SUBSCRIPTION CERTIFICATES TO THE COMPANY.

     If a Rights  holder does not indicate the number of Rights being  exercised
in  the  Primary  Subscription,   or  does  not  deliver  full  payment  of  the
Subscription  Price  for the  number  of shares  indicated  as being  subscribed
through the exercise of Rights,  then such Rights  holder will be deemed to have
exercised Rights to purchase the maximum number of Common Shares

                                      -18-

<PAGE>



determined  by dividing the total  Subscription  Price paid by the  Subscription
Price per share,  but not in excess of the number of Common  Shares  such holder
may purchase through the exercise of Rights in the Primary Subscription.

     If the Rights holder does not indicate the number of Rights being exercised
or  the  number  of  shares   such  holder   wishes  to  purchase   through  the
Over-Subscription  Privilege,  but  submits  payment for more shares than may be
purchased   through  the  exercise  of  such  holder's  Rights  in  the  Primary
Subscription, the excess payment received from such Rights holder will be deemed
to  be a  subscription  payment  for  a  number  of  additional  shares  in  the
Over-Subscription  Privilege  determined  by dividing  the amount of such excess
payment by the Subscription Price per share.

     All questions concerning the timeliness,  validity, form and eligibility of
any  exercise  of  Rights  or  subscriptions  pursuant  to the  Oversubscription
Privilege will be determined by the Company,  whose  determination will be final
and  binding.  The  Company  in its sole  discretion  may  waive  any  defect or
irregularity,  or may permit any defect or irregularity to be corrected,  within
such time as the Company may determine,  or the Company may reject,  in whole or
in part, the purported exercise of any Right in the Primary  Subscription or any
subscription pursuant to the Oversubscription Privilege. Neither the Company nor
the  Subscription  Agent  will be  under  any  duty or  obligation  to give  any
notification  or to permit the cure of any defect or  irregularity in connection
with the submission of any Subscription Certificate,  the exercise or attempt to
exercise  any Right or the  Oversubscription  Privilege,  or the  payment of the
Subscription  Price.  Subscriptions  through  the  exercise  of  Rights  or  the
Oversubscription  Privilege will not be deemed to have been received or accepted
by the  Company  until all  irregularities  or defects  have been  waived by the
Company or cured to the  satisfaction  of, and within the time  allotted by, the
Company in its sole discretion.

Over-Subscription Privilege

     Common Shares not sold by the Company through the exercise of Rights in the
Primary  Subscription  will  be  offered,  by  means  of  the  Over-Subscription
Privilege,  to the Record Date  Shareholders  who have exercised all exercisable
Rights  issued to them.  The  Over-Subscription  Privilege may allow Record Date
Shareholders  to acquire more Common  Shares than the number  issuable  upon the
exercise  of the  Rights  issued  to  them.  Record  Date  Shareholders  such as
broker-dealers,  banks, and other professional intermediaries who hold shares on
behalf of clients,  may participate in the  Over-Subscription  Privilege for the
client if the client fully exercises all Rights attributable to him. Record Date
Shareholders should indicate, on the Subscription  Certificate which they submit
with  respect to the  exercise  of the Rights  issued to them,  how many  Common
Shares they are willing to acquire pursuant to the Over-Subscription  Privilege.
If  sufficient  Common  Shares  remain  after  the  Primary  Subscription,   all
over-subscriptions will be honored in full.

     If subscriptions for Common Shares through the Over-Subscription  Privilege
exceed the Common Shares available for sale after the Primary Subscription,  the
available Common Shares will be allocated among those who  over-subscribe  based
on the number of Rights originally

                                      -19-

<PAGE>



issued  to them,  so that the  number  of Common  Shares  issued to Record  Date
Shareholders  who subscribe  pursuant to the  Over-Subscription  Privilege  will
generally be in  proportion  to the number of Common Shares owned by them on the
Record Date.  The  percentage of remaining  Common Shares each  over-subscribing
Record  Date  Shareholder  may  acquire  may be  rounded up or down to result in
delivery  of whole  shares.  The  allocation  process  may  involve  a series of
allocations  in order to assure that the total  number of shares  available  for
over-subscriptions is distributed on a pro rata basis. A Record Date Shareholder
who is not  allocated the full amount of shares that the holder  subscribes  for
pursuant  to the  Over-Subscription  Privilege  will  receive  a  refund  of the
Subscription  Price paid by such holder for shares that are not allocated to and
purchased  by such  holder.  Such refund  will be made by a check  mailed by the
Subscription Agent.

     If a Rights holder does not deliver full payment of the Subscription  Price
for the number of shares indicated as being  subscribed  through the exercise of
the Oversubscription  Privilege,  then such Rights holder will be deemed to have
exercised  the  Oversubscription  Privilege  to purchase  the maximum  number of
Common  Shares  determined  by dividing  the total  Subscription  Price paid (in
excess of the  Subscription  Price for the number of Common  Shares  such holder
purchased  through the  exercise of Rights in the Primary  Subscription)  by the
Subscription Price per share.

Payment for Shares

     Holders of Rights who wish to exercise  their  Rights or to acquire  Common
Shares  pursuant  to the  Over-Subscription  Privilege  may choose  between  the
following methods of payment:

     1. The Rights holder may send the  Subscription  Certificate  together with
payment  for  the  Common  Shares  acquired  on  Primary  Subscription  and  any
additional  Common Shares that the Right holder  desires to acquire  through the
Over-Subscription  Privilege  (if the Rights  holder is entitled to exercise the
Over-Subscription  Privilege) to the Subscription  Agent. A subscription will be
deemed  accepted when payment,  together with a properly  completed and executed
Subscription Certificate, is received by the Subscription Agent at its Corporate
Stock  Transfer  Department.  Such payment and properly  completed  and executed
Subscription  Certificate  must be received by the  Subscription  Agent no later
than 5:00 p.m.,  New York City time, on the Expiration  Date.  The  Subscription
Agent will deposit all checks  received by it for the purchase of Common  Shares
into a segregated  interest-bearing  account of the Company (the  interest  from
which will belong to the Company)  pending  proration and distribution of Common
Shares.  TO BE  ACCEPTED,  A PAYMENT  PURSUANT  TO THIS  METHOD  MUST BE IN U.S.
DOLLARS BY MONEY  ORDER OR CHECK DRAWN ON A BANK  LOCATED IN THE UNITED  STATES,
MUST BE PAYABLE TO BIOTIME,  INC., AND MUST  ACCOMPANY A PROPERLY  COMPLETED AND
EXECUTED SUBSCRIPTION CERTIFICATE.

     2. Alternatively, a subscription will be accepted by the Subscription Agent
if,  prior to 5:00  p.m.,  New York  City  time,  on the  Expiration  Date,  the
Subscription  Agent has  received a notice of  guaranteed  delivery by facsimile
(telecopy)  or  otherwise  from a bank,  a trust  company,  or a New York  Stock
Exchange member guaranteeing delivery of (i) payment of the full

                                      -20-

<PAGE>



Subscription  Price  for  the  Common  Shares  subscribed  for  in  the  Primary
Subscription  and any  additional  Common Shares  subscribed for pursuant to the
Over-Subscription Privilege (for Record Date Shareholders),  and (ii) a properly
completed and executed Subscription Certificate. The Subscription Agent will not
honor a notice of guaranteed  delivery unless a properly  completed and executed
Subscription  Certificate  and full payment for the Common Shares is received by
the Subscription  Agent by the close of business on the third Business Day after
the Expiration Date.

     A Rights  holder  will  have no right  to  rescind  a  purchase  after  the
Subscription  Agent  has  received  payment  either  by  means  of a  notice  of
guaranteed delivery or a check.

     Nominees who hold Common Shares for the account of others, such as brokers,
trustees or depositories for securities, should notify the respective beneficial
owners of such Common  Shares as soon as possible to ascertain  such  beneficial
owners' intentions and to obtain instructions with respect to the Rights. If the
beneficial  owner so instructs,  the nominee  should  complete the  Subscription
Certificate and submit it to the Subscription Agent with the proper payment.  In
addition,  beneficial  owners of Common  Shares or Rights  held  through  such a
nominee   should   contact  the  nominee  and  request  the  nominee  to  effect
transactions in accordance with the beneficial owner's instructions.

Amendment, Extension or Termination of the Offer

     The Company reserves the right, in its sole  discretion,  to: (a) terminate
the Offer prior to delivery of the Common  Shares for which Rights  holders have
subscribed pursuant to the exercise of Rights in the Primary Subscription or the
Oversubscription Privilege; (b) extend the Termination Date to a later date; (c)
change the Record Date prior to the  distribution  of the Rights to shareholders
or; (d) amend or modify the terms of the Offer.  If the Company amends the terms
of the Offer, an amended  Prospectus will be distributed to holders of record of
Rights  and to  holders  of Rights who have  previously  exercised  Rights.  All
holders of Rights who exercised  their Rights prior to such  amendment or within
four business days after the mailing of the amended Prospectus will be given the
opportunity  to confirm the exercise of their Rights by executing and delivering
a consent form.

     Any Rights  holder who  exercised  Rights  before or within four days after
mailing of an amended  Prospectus  relating to an amendment of the Offer and who
fails to deliver,  in a proper and timely manner,  a properly  executed  consent
form will be deemed to have  rejected the amended terms of the Offer and to have
elected to revoke in full their exercise of the Rights and the  Oversubscription
Privilege.  If a Rights  holder's  exercise  of Rights is so  revoked,  the full
amount of the Subscription  Price paid by such Rights holder will be returned to
the Rights holder.

     A Rights holder whose executed Subscription  Certificate is received by the
Subscription  Agent  more  than  four  days  after  the  mailing  of an  amended
Prospectus  will be deemed to have  accepted  the amended  terms of the Offer in
connection with the exercise of their Rights and the Oversubscription Privilege.


                                      -21-

<PAGE>



     If the Company  elects to terminate the Offer before  delivering the Common
Shares for which Rights holders have  subscribed,  the  Subscription  Price paid
will be returned by mail.  Except for the obligation to return the  Subscription
Price paid by Rights holders who attempted to exercise their Rights, neither the
Company nor the  Subscription  Agent will have any  obligation or liability to a
Rights holder or purchaser of Rights in the event of an amendment or termination
of the Offer.

Delivery of Share Certificates

     Certificates  representing  Common Shares purchased pursuant to the Primary
Subscription  will be delivered to the purchasers as soon as  practicable  after
the  corresponding  Rights have been validly exercised and full payment for such
Common Shares has been received and cleared.  Certificates  representing  Common
Shares purchased pursuant to the  Over-Subscription  Privilege will be delivered
to the purchaser as soon as practicable  after the Expiration Date and after all
allocations have been affected.  It is expected that such  certificates  will be
available  for delivery  three  Business  Days  following  the Expiration Date.

Subscription Agent

     The  Subscription  Agent is American Stock Transfer & Trust Company,  which
will receive for its administrative, processing, invoicing and other services as
Subscription  Agent, a fee estimated to be $25,000,  and  reimbursement  for all
out-of-pocket  expenses related to the Offer. The Subscription Agent is also the
Company's  transfer agent and registrar.  Questions  regarding the  Subscription
Certificates  should be directed to American Stock Transfer & Trust Company,  40
Wall Street, New York, New York, 10005 (telephone (718) 921-8200).  Shareholders
may also consult their brokers or nominees.

Sale of Rights

     The Rights  evidenced by a Subscription  Certificate  may be transferred in
whole by endorsing the Subscription  Certificate for transfer in accordance with
the  accompanying  instructions.  A portion of the Rights  evidenced by a single
Subscription  Certificate  (but not  fractional  Rights) may be  transferred  by
delivering  to  the  Subscription  Agent  a  Subscription  Certificate  properly
endorsed for transfer,  with instructions to register such portion of the Rights
evidenced  thereby in the name of the transferee and to issue a new Subscription
Certificate to the transferee evidencing such transferred Rights. In such event,
a new  Subscription  Certificate  evidencing  the  balance of the Rights will be
issued to the Record  Date  Shareholder  or, if the Record Date  Shareholder  so
instructs, to an additional transferee.

     Record  Date  Shareholders  wishing to  transfer  all or a portion of their
Rights should allow  sufficient  time prior to the  Expiration  Date for (i) the
transfer  instructions to be received and processed by the  Subscription  Agent;
(ii)  a new  Subscription  Certificate  to be  issued  and  transmitted  to  the
transferee  or  transferees  with  respect  to  transferred  Rights,  and to the
transferor  with  respect  to  retained  Rights,  if any;  and (iii) the  Rights
evidenced by such new  Subscription  Certificate  to be exercised or sold by the
recipients. The Company and the

                                      -22-

<PAGE>



Subscription  Agent shall have no  liability to a transferee  or  transferor  of
Rights if  Subscription  Certificates  are not  received in time for exercise or
sale prior to the Expiration Date.

     Except for the fees charged by the  Subscription  Agent (which will be paid
by the Company),  all commissions,  fees and other expenses (including brokerage
commissions and transfer  taxes) incurred in connection with the purchase,  sale
or exercise of Rights will be for the account of the  transferor  of the Rights,
and none of such  commissions,  fees or expenses  will be paid by the Company or
the Subscription Agent.

     The  Company  anticipates  that the Rights will be  eligible  for  transfer
through,  and  that  the  exercise  of the  Primary  Subscription  (but  not the
Over-Subscription  Privilege)  may be affected  through,  the  facilities of The
Depository Trust Company ("DTC");  Rights exercised  through DTC are referred to
as "DTC Exercised Rights".  The holder of a DTC Exercised Right who was a Record
Date Shareholder may exercise the Over-Subscription Privilege in respect of such
DTC Exercised  Right by properly  executing and  delivering to the  Subscription
Agent,  at or prior to 5:00 p.m., New York City time, on the Expiration  Date, a
DTC  Participant  Over-  Subscription   Form,   together  with  payment  of  the
Subscription   Price   for  the   number  of   Common   Shares   for  which  the
Over-Subscription  Privilege is to be exercised.  Copies of the DTC  Participant
Over-Subscription Form may be obtained from the Subscription Agent.

Federal Income Tax Consequences

     The U.S.  Federal income tax  consequences to holders of Common Shares with
respect to the Offer will be as follows:

     1. The  distribution  of Rights will not result in taxable  income nor will
the holder realize taxable income as a result of the exercise of Rights.

     2. The basis of a Right will be (a) to a holder of Common Shares to whom it
is issued,  and who  exercises or sells the Right (i) if the market value of the
Right  immediately  after  issuance is less than 15% of the market  value of the
Common Share with regard to which it is issued,  zero (unless the holder elects,
by filing a statement  with his timely filed  federal  income tax return for the
year in which the Rights are received, to allocate the basis of the Common Share
between the Right and the Common Share based on their  respective  market values
immediately  after the Right is  issued),  and (ii) if the  market  value of the
Right  immediately  after  issuance  is 15% or more of the  market  value of the
Common Share with  respect to which it is issued,  a portion of the basis in the
Common Share based upon the respective  values of the Common Share and the Right
immediately after the Right is issued;  (b) to a holder of Common Shares to whom
it is issued and who allows  the Right to  expire,  zero;  and (c) to anyone who
purchases a Right in the market, the cost to acquire the Right.

     3. The holding  period of a Right  received  by a holder of a Common  Share
includes the holding period of the Common Share.

     4. Any gain or loss on the sale of a Right  will be  treated  as a  capital
gain or loss if the

                                      -23-

<PAGE>



Right is a capital asset in the hands of the seller. Such a capital gain or loss
will be long-term or short-term,  depending on how long the Right has been held,
in  accordance  with  paragraph 3 above.  A Right issued with regard to a Common
Share will be a capital asset in the hands of the person to whom it is issued if
the Common Share was a capital asset in the hands of that person.  If a Right is
allowed to  expire,  there  will be no loss  realized  unless the Right had been
acquired by  purchase,  in which case there will be a loss equal to the basis of
the Right.

     5. If a Right is exercised by the holder of Common Shares, the basis of the
Common  Share  received  will  include the basis  allocated to the Right and the
amount paid upon exercise of the Right.

     6. If a Right is exercised, the holding period of the Common Share acquired
begins on the date the Right is exercised.

     7. Gain recognized by a non-U.S. Shareholder on the sale of a Right will be
taxed in the same manner as gain recognized on the sale of Common Shares.

     Proceeds  from the sale of a Right may be  subject to  withholding  of U.S.
taxes  at  the  rate  of  31%  unless  the  seller's   certified  U.S.  taxpayer
identification  number (or certificate regarding foreign status) is on file with
the  Subscription  Agent and the seller is not otherwise  subject to U.S. backup
withholding.  The 31%  withholding  tax is not an  additional  tax.  Any  amount
withhold may be credited against the seller's U.S. federal income tax liability.

     The foregoing is only a summary of the  applicable  federal  income tax law
and does not include any state or local tax  consequences  of this  transaction.
Record Date  Shareholders  and other Rights  holders  should  consult  their tax
advisers concerning the tax consequences of the Offer.

Special Considerations

     As a result of the terms of the Offer,  Record Date Shareholders who do not
fully  exercise  their Rights should expect that they will, at the completion of
the  Offer,  own a smaller  proportional  interest  in the  Company  than  would
otherwise be the case.


                                 USE OF PROCEEDS

     The net proceeds  received by the Company  from the sale of 283,109  Common
Shares in the Offer will be approximately $5,539,180,  assuming that all of the
Rights are exercised (which cannot be assured),  and after deducting expenses of
the Offer of approximately $123,000. The Company intends to use the net proceeds
of the Offer as follows:

                                      -24-

<PAGE>




 Application                  Estimated Amount                 Percent of Total
 -----------                  ----------------                 ----------------
Research and Development      $ 2,769,590                      50%
Working Capital                 2,769,590                      50
                              ----------------                 --
Total                         $ 5,539,180                      100%
                              ================                 ====

     Research and  Development.  Proceeds  allocated to research and development
will be used to finance  further  testing of Hextend,  PentaLyte and other blood
substitute,  plasma expander and organ preservation solutions being developed by
the Company. When laboratory testing of a product has been completed,  a portion
of the  proceeds  allocated  to  research  and  development  may also be used to
commence  clinical  trials of that product.  Proceeds  allocated to research and
development  and working capital may be used to pay the costs of clinical trials
of Hextend and other products.

     Working  Capital.  The Company intends to apply the balance of the proceeds
of the Offer to working capital and general  corporate  purposes.  The Company's
management  will have  broad  discretion  with  respect  to the use of  proceeds
retained  as  working  capital.  Such  proceeds  may be used to defray  overhead
expenses and for future  opportunities  and  contingencies  that may arise.  The
Company expects that its general and administrative expenses will increase as it
achieves  progress in  developing  products  and  bringing  them to market.  For
example,  a portion of the proceeds  allocated to working capital may be used to
pay the salaries,  benefits and fees to employees and  consultants who assist in
the preparation of applications to the FDA and foreign  regulatory  agencies and
patent  applications.  The Company  will incur  additional  expenses,  including
consulting  fees, in preparing a New Drug Application for filing with the FDA to
seek permission to market Hextend after the clinical trials are complete.

     The  Company  believes  that  the net  proceeds  from the  Offer,  plus the
Company's present cash on hand will permit it to complete its Phase III clinical
trial of Hextend and to continue its planned operations for a period of at least
24 months,  assuming all of the Rights are exercised.  Additional capital may be
needed  before or after that period of time to meet the cost of  developing  and
conducting additional clinical trials.

     The foregoing  table  represents  only an estimate of the allocation of the
net proceeds of the Offer based upon the current state of the Company's  product
development  program.  The development of new medical  products and technologies
often involves complications, delays and costs that cannot be predicted, and may
cause the Company to make a reallocation of proceeds among the categories  shown
above or to other uses.  Although  the  Company is not  presently a party to any
agreement,  arrangement or plan to acquire any assets or technology from a third
party,  the Company might determine that it is necessary or advantageous to make
such an  acquisition,  or the Company might determine to concentrate its efforts
and resources on the development and marketing of one or more specific products.

     Until used, the net proceeds of the Offer will be invested in  certificates
of  deposit,   United  States  government  securities  or  other  high  quality,
short-term interest-bearing investments.

                                      -25-

<PAGE>


                            DESCRIPTION OF SECURITIES

Common Shares

     The Company's Articles of Incorporation currently authorize the issuance of
up to 5,000,000  Common Shares,  no par value,  of which  2,831,084  shares were
outstanding  at December 27, 1996.  The Common  Shares are held by 1,041 persons
based upon the share  position  listings for the Common  Shares.  Each holder of
record is entitled to one vote for each outstanding Common Share owned by him on
every matter properly submitted to the shareholders for their vote.

     Subject to the dividend  rights of holders of any of the  preferred  shares
that may be issued from time to time,  holders of Common  Shares are entitled to
any dividend  declared by the Board of Directors out of funds legally  available
for such  purpose.  The  Company has not paid any cash  dividends  on its Common
Shares,  and it is unlikely that any cash  dividends will be declared or paid on
any Common  Shares in the  foreseeable  future.  Instead,  the Company  plans to
retain its cash for use in financing its future operations and growth.

     Subject to the prior  payment of the  liquidation  preference to holders of
any preferred  shares that may be issued,  holders of Common Shares are entitled
to receive on a pro rata basis all remaining assets of the Company available for
distribution  to the holders of Common  Shares in the event of the  liquidation,
dissolution,  or winding up of the Company. Holders of Common Shares do not have
any preemptive  rights to become  subscribers or purchasers of additional shares
of any class of the Company's capital stock.

Preferred Shares

     The Company's Articles of Incorporation currently authorize the issuance of
up to 1,000,000  preferred shares, no par value.  Preferred shares may be issued
by  the  Company  in  one  or  more  series,  at any  time,  with  such  rights,
preferences,   privileges  and  restrictions  as  the  Board  of  Directors  may
determine,  all without further action of the  shareholders of the Company.  Any
series of preferred  shares which may be authorized by the Board of Directors in
the future may be senior to and have  greater  rights and  preferences  than the
Common  Shares.  There are no preferred  shares  presently  outstanding  and the
Company has no present  plan,  arrangement  or commitment to issue any preferred
shares.

Transfer Agent and Registrar

     The Transfer  Agent and Registrar  for the Common Shares is American  Stock
Transfer and Trust Company, 40 Wall Street, New York, New York 10005.

                                      -26-

<PAGE>



                                    WARRANTS

     This  Prospectus also relates to 29,013 Common Shares issued by the Company
upon exercise of certain warrants sold to Emanuel & Company,  Inc. in connection
with the  underwriting  of BioTime's  initial  public  offering of Common Shares
during March 1993 (the "Emanuel  Warrants"),  and 76,000 Common Shares  issuable
upon the exercise of certain  warrants sold to H.J. Meyers & Co. Inc.  (formerly
Thomas James and  Associates) in connection  with the  underwriting  of a public
offering of Common Shares during  February  1994 (the "H.J.  Meyers  Warrants").
Holders of the H.J.  Meyers Warrants may rely upon this Prospectus in connection
with the  purchase of Common  Shares from the  Company  through the  exercise of
their warrants.  The H.J.  Meyers Warrants will expire unless  exercised by 5:00
p.m. Eastern Standard Time on February 23, 1999.

H.J. Meyers Warrants

     The H.J.  Meyers  Warrants  entitle  the  holders to  purchase up to 76,000
Common Shares at an exercise price of $7.18 per share.  The H.J. Meyers Warrants
became exercisable on February 24, 1995 and will expire if not exercised by 5:00
p.m.  Eastern  Standard  Time on February 23, 1999.  The number of Common Shares
issuable upon the exercise of the H.J. Meyers  Warrants,  and the exercise price
per share,  are subject to pro rata adjustment to prevent  dilution in the event
of a split-up,  stock dividend,  combination,  or other  recapitalization of the
Company.


                                      -27-

<PAGE>



     The foregoing description of the H.J. Meyers Warrants is only a summary and
is  qualified  in all  respects  to the  full  text of the  form of H.J.  Meyers
Warrant,  a copy of which is on file with the  Company  and the  Securities  and
Exchange Commission.

Plan of Distribution

     In  connection  with the sale of the Emanuel  Warrants and the H.J.  Meyers
Warrants,  the  Company  agreed to  register  for sale  under the Act the Common
Shares  issuable upon the exercise of the  warrants.  The Company is bearing all
expenses  of  registering  the  Common  Shares  for sale under the Act and under
applicable  state securities laws, but the holders of the warrants will bear any
and all  commissions,  fees,  and  discounts  of brokers  and  dealers,  and all
transfer  taxes and fees is  connection  with any sales of  Common  Shares.  The
Company has agreed to use its best efforts to keep the  registration  statement,
of which this Prospectus is a part, effective for a period of up to 120 days.

     The following table presents certain information  pertaining to the holders
of Common Shares issued upon the exercise of the Emanuel Warrants and holders of
the H.J.  Meyers  Warrants  and is derived  from the  Company's  stock  transfer
records and from information furnished to the Company by such holders.

<TABLE>
<CAPTION>

                              Common                   Common
                              Shares               Shares Offered         Shares Owned
     Name                     Owned                    For Sale            After Sale
     ----                    -------               --------------         -------------
<S>                         <C>                       <C>                      <C>
Eric D. Emanuel(1)           29,013                    29,013                   0

James Villa(2)                   0                     64,800                   0

Jerome Feldman(2)                0                     11,200                   0
- ------------------------------------
<FN>
(1)  Includes  Common  Shares  issued  upon  the  exercise  of the  Emanuel
Warrants.

(2)  The shares offered for sale include shares issuable upon the exercise of 
the H.J.  Meyers Warrants. Excludes  Common  Shares owned by H.J.  Meyers & Co.,
Inc. Mr. Villa is the President and principal  shareholder of H.J. Meyers & Co.,
Inc., and Mr. Feldman is a Vice President of H.J. Meyers, & Co., Inc.
</FN>
</TABLE>

                                      -28-

<PAGE>



     The holders of the Common Shares and warrants shown in the preceding  table
may sell some or all of their  Common  Shares  through  the Nasdaq or the Boston
Stock Exchange or otherwise at prices and on terms then prevailing, or at prices
related to the then current market price,  or in negotiated  transactions.  Such
security  holders of may sell some or all of their Common Shares in transactions
involving  broker-dealers  who may act as agent or who may acquire Common Shares
as  principal.  During such time as the H.J.  Meyers  Warrants are  exercisable,
broker-dealers  also may acquire such  warrants from the holders at prices based
upon the  difference  between the then current market price of the Common Shares
(or prices  related to the then current  market price of the Common  Shares) and
the  exercise  price of the  warrants,  but  subject  to  discounts  or  selling
concessions.  Such  broker-dealers  may then exercise the warrants for their own
accounts and sell the Common Shares as principals. Alternatively, broker-dealers
may,   subject  to  applicable  laws  and   regulations   pertaining  to  margin
transactions,  finance  the  exercise  of the  warrants  by the holders and then
purchase  and sell as  principals,  or sell as agents,  the Common  Shares.  Any
broker-dealers   participating  in  such  transactions  as  agents  may  receive
commissions  from the holders of the Common Shares or warrants (and, if they act
as agents for the purchasers of such Common Shares, from such purchasers). Usual
and  customary  brokerage  fees will be paid by the holders of Common Shares and
warrants  who  are  not  broker-dealers.  Broker-dealers  may  agree  to  sell a
specified number of Common Shares at a stipulated  price per share,  and, to the
extent such a  broker-dealer  is unable to do so acting as agent for the holders
of the Common Shares or  warrants,to  purchase as principal any unsold shares at
the price required to fulfill the broker-dealer  commitment to the holder of the
Common  Shares  or  warrants.   Broker-dealers  who  acquire  Common  Shares  as
principals  may  thereafter  resell  such  Common  Shares  from  time to time in
transactions  (which may involve  crosses and block  transactions  and which may
involve sales to and through other broker-dealers, including transactions of the
nature described  above) through the Nasdaq or on the Boston Stock Exchange,  in
negotiated transactions or otherwise, at market prices prevailing at the time of
sale or at negotiated  prices, and in connection with such resales may pay to or
receive  from  the   purchasers  of  such  Common  Shares  usual  and  customary
commissions.

     Each holder of Common Shares or warrants  shown in the preceding  table has
advised  the  Company  that  during  such  time as such he may be  engaged  in a
distribution  of the Common  Shares,  such  person  will:  (a) not engage in any
stabilization activity in connection with the Company's securities; (b) cause to
be furnished to each broker  through whom Common Shares  included  herein may be
offered such copies of this  Prospectus  as may be required by such broker;  and
(c) not bid for or  purchase  any  securities  of the  Company  or any rights to
acquire the  Company's  securities,  or attempt to induce any person to purchase
any of the  Company's  securities  or rights other than as  permitted  under the
Securities  Exchange  Act of  1934.  Such  holders  and any  broker-dealers  who
participate in the sale of Common Shares may be deemed to be  "underwriters"  as
defined in the Act. Any commissions paid or any discounts or concessions allowed
to any such  broker-dealers  and,  if any such  broker-dealers  purchase  Common
Shares as principals,  any profits  received on the resale of such Common Shares
may be deemed to be underwriting discounts and commissions under the Act.


                                      -29-

<PAGE>



                                  LEGAL MATTERS

     The  validity  of the Rights and Common  Shares will be passed upon for the
Company  by  Lippenberger,   Thompson,   Welch  &  Soroko  LLP,  San  Francisco,
California. A member of Lippenberger,  Thompson, Welch & Soroko LLP owns options
to purchase 10,000 Common Shares.


                                     EXPERTS

     The financial statements of BioTime,  Inc. as of June 30, 1995 and 1996 and
for  each  of the  three  fiscal  years  in  the  period  ended  June  30,  1996
incorporated by reference in this Prospectus from the Company's Annual Report on
Form 10-K for the year  ended  June 30,  1996 have been  audited  by  Deloitte &
Touche LLP, independent  auditors, as stated in their report (which expresses an
unqualified  opinion  and  includes  an  explanatory  paragraph  related  to the
development stage of the Company's operations), and have been so incorporated in
reliance  upon the report of such firm given upon their  authority as experts in
accounting and auditing.


                INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

     The Company is delivering  with this Prospectus a copy of its Annual Report
on Form 10-K for the fiscal  year ended June 30,  1996.  The Form 10-K  includes
important  information  about the Company and should be carefully in read in its
entirety by holders of Rights.

     The Company's Form 10-K for the fiscal year ended June 30, 1996,  Form 10-Q
for the three months ended  September  30, 1996,  and all other reports filed by
the Company pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of
1934, as amended, since the end of the fiscal year covered by such Form 10-K are
hereby incorporated into this Prospectus by reference.  The Company will provide
without  charge  to each  person,  including  any  beneficial  owner,  to whom a
prospectus is delivered,  upon written or oral request of such person, a copy of
any and all of the  information  that has been  incorporated  by reference  (not
including  exhibits).  Such  requests may be  addressed to the  Secretary of the
Company at 935 Pardee  Street,  Berkeley,  California  94710;  Telephone:  (510)
845-9535.




                             ADDITIONAL INFORMATION

     The Company has filed with the  Securities  and  Exchange  Commission,  450
Fifth Street, N.W., Washington,  D.C. a Registration Statement on Form S-3 under
the Securities Act of 1933, as amended,  for the  registration of the securities
offered hereby.  This Prospectus,  which is part of the Registration  Statement,
does not contain all of the information contained in the Registration Statement.
For further information with respect to the Company and the securities

                                      -30-

<PAGE>



offered hereby,  reference is made to the Registration Statement,  including the
exhibits thereto,  which may be inspected,  without charge, at the Office of the
Securities and Exchange Commission,  or copies of which may be obtained from the
Commission in Washington,  D.C. upon payment of the requisite  fees.  Statements
contained in this Prospectus as to the content of any contract or other document
referred to are not necessarily complete, and in each instance reference is made
to the copy of such  contract  or other  document  filed  as an  exhibit  to the
Registration  Statement,  each such statement being qualified in all respects by
such reference.

                                      -31-

<PAGE>



CONTROL NUMBER      BIOTIME, INC.                  SUBSCRIPTION CERTIFICATE FOR

Expiration Date February 4, 1997                             SHARES
                                        SUBSCRIPTION PRICE U.S. $20.00 PER SHARE

                                                              CUSIP 09066L 11 3

                       SUBSCRIPTION CERTIFICATE FOR COMMON
               SHARES VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
            (NEW YORK TIME) ON FEBRUARY 4, 1997, THE EXPIRATION DATE.
                 THIS SUBSCRIPTION CERTIFICATE IS TRANSFERRABLE
           AND MAY BE COMBINED OR DIVIDED (BUT ONLY INTO SUBSCRIPTION
                CERTIFICATES EVIDENCING A WHOLE NUMBER OF RIGHTS)
                     AT THE OFFICE OF THE SUBSCRIPTION AGENT


THIS SUBSCRIPTION CERTIFICATE MAY BE USED TO SUBSCRIBE FOR
COMMON SHARES OR MAY BE ASSIGNED OR SOLD.  FULL INSTRUCTIONS
APPEAR ON THE BACK OF THIS SUBSCRIPTION CERTIFICATE.

REGISTERED OWNER:


     The registered  owner of this  Subscription  Certificate,  named above,  or
assignee, is entitled to the number of Rights to subscribe for Common Shares, no
par value,  of BioTime,  Inc. shown above,  in the ratio of one Common Share for
each ten Rights held,  pursuant to the Primary  Subscription  and upon the terms
and  conditions  and at  the  price  for  each  Common  Share  specified  in the
Prospectus dated January 10, 1997.


     If you  subscribe  for  fewer  than  all  the  shares  represented  by this
Subscription  Certificate,  the Subscription Agent will issue a new Subscription
Certificate  representing the balance of the unsubscribed Rights,  provided that
the  Subscription  Agent has  received  your  properly  completed  and  executed
Subscription  Certificate  and  payment  prior to 5:00 p.m.,  New York time,  on
February 3,  1997. No new  Subscription  Certificate  will be issued after that
date.
IMPORTANT:  Complete appropriate form on reverse


DATE:  _______________, 199__


                                                     BIOTIME, INC.


- -----------------------------           ----------------------------------
        SECRETARY                                    PRESIDENT

Countersigned:  American Stock Transfer & Trust Company (New York, N.Y.)
                Subscription Agent

                By: ___________________________________________________
                                    Authorized Signature



                                   APPENDIX A


<PAGE>



                         Expiration Date: February 4, 1997

                   PLEASE COMPLETE ALL APPLICABLE INFORMATION

By Mail:                   By Hand:                   By Overnight Courier:
To: American Stock         To: American Stock         To: American Stock
Transfer & Trust Company   Transfer & Trust Company   Transfer & Trust Company
40 Wall Street             40 Wall Street, 46th Floor 40 Wall Street, 46th Floor
New York, New York 10005   New York, New York 10005   New York, New York 10005

    SECTION     1: TO SUBSCRIBE:  I hereby irrevocably  subscribe for the dollar
                amount of Common Shares  indicated as the total of A and B below
                upon  the  terms  and  conditions  specified  in the  Prospectus
                related hereto, receipt of which is acknowledged.

                TO SELL:  If I have checked  either the box on line C or the box
                on line D, I  authorize  the sale of Rights by the  Subscription
                Agent  according to the procedures  described in the Prospectus.
                The check for the proceeds of sale will be mailed to the address
                of record.

    Please check |X| below:

 |_| A.  Primary Subscription ____________________ / 10 =
                              (Rights Exercised)

              .000      $  20.00                $
- ------------------  X   -------------------  =  ----------------------
(Shares Requested)      (Subscription Price)      (Amount Required)


 |_| B.  Over-Subscription Privilege

                   .000   $  20.00                 $                  (*)
  --------------------  X --------------------  =  ----------------------
   (Shares Requested)     (Subscription Price)       (Amount Required)

Amount of Check Enclosed or Amount in Notice of Guaranteed  Delivery (total of A
+ B) = $
       ----------------

               Make check payable to the order of "BioTime, Inc."

            (*) The Over-Subscription  Privilege can be exercised by Record Date
Shareholders only, as described in the Prospectus.

    |_| C.  Sell any remaining unexercised Rights

    |_| D.  Sell all of my Rights.

      _______________________________________          
       Signature of Subscriber(s)/Seller(s)                                    

Please provide your telephone number              Day (___) ___________________
                                                Evening (___) _________________

Social Security Number or Tax ID Number: ______________________________________

       SECTION II: TO TRANSFER RIGHTS: (except pursuant to C and D above)

For value received,  ________________________of  the Rights  represented by this
Subscription Certificate are assigned to

  --------------------------------------------------------
    Social Security Number or Tax ID Number of Assignee   

  --------------------------------------------------------
            (Print Full Name of Assignee)


  --------------------------------------------------------
      Signature(s) of Assignor(s)

  --------------------------------------------------------
    (Print Full Address including postal Zip Code)

    The  signature(s)  must correspond with the name(s) as written upon the face
of this Subscription Certificate, in every particular, without alteration.

IMPORTANT:  For Transfer,  a Signature Guarantee must be provided by an eligible
financial institution which is a participant in a recognized signature guarantee
program.

    SIGNATURE GUARANTEED BY:

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

PROCEEDS  FROM THE SALE OF RIGHTS MAY BE SUBJECT TO  WITHHOLDING  OF U.S.  TAXES
UNLESS  THE  SELLER'S   CERTIFIED  U.S.  TAXPAYER   IDENTIFICATION   NUMBER  (OR
CERTIFICATION  REGARDING FOREIGN STATUS) IS ON FILE WITH THE SUBSCRIPTION  AGENT
AND THE SELLER IS NOT OTHERWISE SUBJECT TO U.S. BACKUP WITHHOLDING.

    |_| CHECK  HERE IF  RIGHTS  ARE  BEING  EXERCISED  PURSUANT  TO A NOTICE  OF
        GUARANTEED  DELIVERY  DELIVERED TO THE  SUBSCRIPTION  AGENT PRIOR TO THE
        DATE HEREOF AND COMPLETE THE FOLLOWING:

        NAME(S) OF REGISTERED OWNER(S):
        WINDOW TICKET NUMBER (IF ANY):
        DATE OF EXECUTION OF NOTICE OF GUARANTEED DELIVERY:
        NAME OF INSTITUTION WHICH GUARANTEED DELIVERY:


<PAGE>



                                   APPENDIX B

                     [Form of Notice of Guaranteed Delivery]

            NOTICE OF GUARANTEED DELIVERY OF SUBSCRIPTION RIGHTS AND
                   THE SUBSCRIPTION PRICE FOR COMMON SHARES OF
                   BIOTIME, INC. SUBSCRIBED FOR IN THE PRIMARY
                SUBSCRIPTION AND THE OVER-SUBSCRIPTION PRIVILEGE


     As set forth in the Prospectus under "The Offer - Payment for Shares," this
form  or one  substantially  equivalent  may be used  as a  means  of  effecting
subscription and payment for all Common Shares of BioTime,  Inc.  subscribed for
in the Primary Subscription and the Over-Subscription  Privilege.  Such form may
be  delivered by hand or sent by facsimile  transmission,  overnight  courier or
mail to the Subscription Agent.

                           The Subscription Agent is:
                     American Stock Transfer & Trust Company


         By Mail:                                         By Facsimile:
American Stock Transfer & Trust Company                   (718) 234-5001
         40 Wall Street                                Confirm by Telephone
   New York, New York 10005                               (718) 234-2700

        By Hand:                                      Overnight Courier:
American Stock Transfer & Trust Company  American Stock Transfer & Trust Company
        40 Wall Street                              40 Wall Street, 46th Floor
        New York, New York 10005                     New York, New York 10005

          DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF
         INSTRUCTIONS VIA A TELECOPY OR FACSIMILE NUMBER, OTHER THAN AS
              SET FORTH ABOVE, DOES NOT CONSTITUTE A VALID DELIVERY

     The New York Stock  Exchange  member  firm or bank or trust  company  which
completes  this form must  communicate  the  guarantee  and the number of shares
subscribed for (under both the Primary  Subscription and the Over-  Subscription
Privilege) to the Subscription  Agent and must deliver this Notice of Guaranteed
Delivery  guaranteeing delivery of (i) payment in full for all subscribed shares
and (ii) a properly  completed  and  executed  Subscription  Certificate  (which
certificate  and full payment must then be delivered by the close of business on
the third business day after the Expiration  Date, as defined in the Prospectus)
to the  Subscription  Agent prior to 5:00 p.m., New York time, on the Expiration
Date  (February 4,  1997,  unless  extended).  Failure to do so will result in a
forfeiture of the Rights.





<PAGE>


                                    GUARANTEE

     The undersigned,  a member firm of the New York Stock Exchange or a bank or
trust company,  guarantees  delivery to the  Subscription  Agent by the close of
business  (5:00  p.m.,  New York  time) on the  third  Business  Day  after  the
Expiration Date (February 4, 1997, unless  extended)of (A) a properly  completed
and executed  Subscription  Certificate and (B) payment of the full Subscription
Price of shares  subscribed for in the Primary  Subscription and pursuant to the
Over-Subscription  Privilege,  if applicable,  as  subscription  for such Common
Shares as indicated herein or in the Subscription Certificate.

  ---------------------------------------------
  Number of Common Shares subscribed for in the
  Primary Subscription for which you are
  guaranteeing delivery of Rights and payment

  ---------------------------------------------
  Number of Common Shares subscribed for
  pursuant to the  Over-Subscription Privilege
  for  which  guaranteeing  delivery  of  Rights
  and  payment

Number of Rights to be delivered: _____________________________________________

Total Subscription Price payment to be
delivered:                       $_____________________________________________

Method of Delivery [circle one]                   A.  Through DTC
                                                  B.  Direct to Corporation

     Please note that if you are guaranteeing for Over-Subscription  Shares, and
are a DTC  participant,  you must also  execute and  forward to  American  Stock
Transfer & Trust Company a Nominee Holder Over-Subscription Exercise Form.

- ----------------------------              -------------------------------------
Name of Firm                                        Authorized Signature

- ----------------------------              -------------------------------------
Address                                                 Title

- ----------------------------              -------------------------------------
Zip Code                                            (Type or Print)

- --------------------------------------    -------------------------------------
Name of Registered Holder (If Applicable)

- -----------------------------             -------------------------------------
Telephone Number                                          Date


*  IF THE RIGHTS  ARE TO BE  DELIVERED  THROUGH  DTC,  A  REPRESENTATIVE  OF THE
   SUBSCRIPTION AGENT WILL PHONE YOU WITH A PROTECT IDENTIFICATION NUMBER, WHICH
   NEEDS TO BE COMMUNICATED BY YOU TO DTC.

   PLEASE NOTE THAT IF YOU ARE GUARANTEEING FOR OVER-SUBSCRIPTION SHARES AND ARE
   A DTC  PARTICIPANT,  YOU MUST ALSO  EXECUTE AND  FORWARD TO THE  SUBSCRIPTION
   AGENT A NOMINEE HOLDER OVER-SUBSCRIPTION EXERCISE FORM.


<PAGE>



                                   APPENDIX C

            [Form of Nominee Holder Over-Subscription Exercise Form]

                                  BIOTIME, INC.
                                 RIGHTS OFFERING
                 NOMINEE HOLDER OVER-SUBSCRIPTION EXERCISE FORM
                   PLEASE COMPLETE ALL APPLICABLE INFORMATION

By Mail:                  By Hand:                    By Overnight Courier:
To: American Stock        To: American Stock          To: American Stock
Transfer & Trust Company  Transfer & Trust Company    Transfer & Trust Company
40 Wall Street            40 Wall Street, 46th Floor  40 Wall Street, 46th Floor
New York, New York 10005   New York, New York 10005   New York, New York 10005

     THIS  FORM  IS  TO  BE  USED  ONLY  BY  NOMINEE  HOLDERS  TO  EXERCISE  THE
OVER-SUBSCRIPTION  PRIVILEGE  IN  RESPECT  OF RIGHTS  WITH  RESPECT TO WHICH THE
PRIMARY   SUBSCRIPTION   PRIVILEGE  WAS  EXERCISED  AND  DELIVERED  THROUGH  THE
FACILITIES  OF A COMMON  DEPOSITORY.  ALL OTHER  EXERCISES OF  OVER-SUBSCRIPTION
PRIVILEGES MUST BE EFFECTED BY THE DELIVERY OF THE SUBSCRIPTION CERTIFICATES.
                             ----------------------

     THE TERMS AND CONDITIONS OF THE RIGHTS  OFFERING ARE SET FORTH IN BIOTIME'S
PROSPECTUS DATED JANUARY 10, 1997 (THE "PROSPECTUS") AND ARE INCORPORATED HEREIN
BY REFERENCE.  COPIES OF THE PROSPECTUS ARE AVAILABLE UPON REQUEST FROM BIOTIME.
- ----------------------

     VOID UNLESS RECEIVED BY THE SUBSCRIPTION AGENT WITH PAYMENT IN FULL BY 5:00
P.M.,  NEW YORK TIME,  ON FEBRUARY  4, 1997,  UNLESS  EXTENDED  BY BIOTIME  (THE
"EXPIRATION DATE").

1.  The  undersigned  hereby  certifies to the  Subscription  Agent that it is a
    participant  in  [Name of  Depository]  (the  "Depository")  and that it has
    either (i) exercised the Primary Subscription Right in respect to Rights and
    delivered  such  exercised  Rights  to the  Subscription  Agent  by means of
    transfer to the  Depository  Account of BioTime,  Inc., or (ii) delivered to
    the  Subscription  Agent a Notice of  Guaranteed  Delivery in respect of the
    exercise  of the  Primary  Subscription  Right and will  deliver  the Rights
    called for in such Notice of Guaranteed  Delivery to the Subscription  Agent
    by means of transfer to such Depository Account of BioTime, Inc.

2.  The  undersigned  hereby  exercises  the   Over-Subscription   Privilege  to
    purchase,  to the  extent  available,  Common  Shares and  certifies  to the
    Subscription Agent that such Over-Subscription  Privilege is being exercised
    for the account or accounts of persons  (which may include the  undersigned)
    on whose behalf all Primary Subscription Rights have been exercised.(*)

3.  The  undersigned  understands  that  payment  of the  Subscription  Price of
    $20.00  per share for each Common Share  subscribed for pursuant to the 
    Over-  Subscription  Privilege  must be received by the  Subscription Agent
    at or before 5:00 p.m.,  New York time, on the  Expiration  Date,  and
    represents that such payment,  in the aggregate  amount of  $_________either
    (check appropriate box):

    |_| has been or is being delivered to the Subscription Agent pursuant to the
    Notice of Guaranteed Delivery referred to above or;
    |_|is being delivered to the Subscription Agent herewith or; 
    |_|has been delivered  separately to the Subscription Agent; and,  in the
       case  of  funds  not  delivered  pursuant  to a  Notice  of
       Guaranteed  Delivery,  is or was  delivered in the manner set forth below
       (check appropriate box and complete information relating thereto):
    |_|uncertified check
    |_| certified check
    |_| bank draft


- --------------------------------------------------- 
Depository Primary Subscription Confirmation Number 

- ---------------------------------------------------
Depository Participant Number

- ---------------------------------------------------
Name of Nominee Holder                             

- ---------------------------------------------------
Address

- ---------------------------------------------------
City                    State             Zip Code
Contact Name _________________________________

Phone Number _________________________________

By: _______________________________________________

Name: _____________________________________________

Title:  ____________________________________________

Dated:                  , 1997


*   PLEASE  COMPLETE  THE  BENEFICIAL  OWNER  CERTIFICATION  ON THE BACK  HEREOF
    CONTAINING THE RECORD DATE POSITION OF PRIMARY  RIGHTS OWNED,  THE NUMBER OF
    PRIMARY SHARES SUBSCRIBED FOR AND THE NUMBER OF OVER-  SUBSCRIPTION  SHARES,
    IF APPLICABLE, REQUESTED BY EACH SUCH OWNER.


<PAGE>



                                  BIOTIME, INC.
                         BENEFICIAL OWNER CERTIFICATION


     The  undersigned,  a  bank,  broker  or  other  nominee  holder  of  Rights
("Rights")  to  purchase  Common  Shares,  no par value  ("Common  Shares"),  of
BioTime,  Inc.  (the  "Company")  pursuant to the Rights  offering (the "Offer")
described and provided for in the Company's  Prospectus  dated January 10, 1997
(the  "Prospectus")  hereby  certifies  to the  Company  and to  American  Stock
Transfer & Trust Company,  as Subscription  Agent for such Offer,  that for each
numbered line filled in below the  undersigned  has exercised,  on behalf of the
beneficial  owner thereof (which may be the  undersigned),  the number of Rights
specified  on  such  line  in  the  Primary  Subscription  (as  defined  in  the
Prospectus),  and such beneficial  owner wishes to subscribe for the purchase of
additional Common Shares pursuant to the Over-Subscription Privilege (as defined
in the Prospectus), in the amount set forth in the third column of such line:
 
                                                Number of Rights Exercised      
                                                     In the Primary             
             Record Date Shares                       Subscription              

1)  ___________________________________     ____________________________________
2)  ___________________________________     ____________________________________
3)  ___________________________________     ____________________________________
4)  ___________________________________     ____________________________________
5)  ___________________________________     ____________________________________
6)  ___________________________________     ____________________________________
7)  ___________________________________     ____________________________________
8)  ___________________________________     ____________________________________
9)  ___________________________________     ____________________________________
10) ___________________________________     ____________________________________

      Number of Shares Requested
            Pursuant to the 
      Over-Subscription Privilege
1)  ___________________________________
2)  ___________________________________
3)  ___________________________________
4)  ___________________________________
5)  ___________________________________
6)  ___________________________________
7)  ___________________________________
8)  ___________________________________
9)  ___________________________________
10) ___________________________________



- -----------------------------------      --------------------------------------
    Name of Nominee Holder                    Depository Participant Number


- -----------------------------------      --------------------------------------
Name:                                        Depository Primary Subscription 
Title:                                           Confirmation Number(s)

Dated:             , 1997


<PAGE>






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

                             ---------------------
No dealer,  salesperson or other person has been  authorized in connection  with
this offering to give any information or to make any representations  other than
those contained in this Prospectus. This Prospectus does not constitute an offer
or a solicitation  in any  jurisdiction  to any person to whom it is unlawful to
make such an offer or solicitation.  Neither the delivery of this Prospectus nor
any sale made hereunder shall,  under any  circumstances,  create an implication
that there has been no change in the  circumstances  of the Company or the facts
herein set forth since the date hereof.


                                  BIOTIME, INC.



                            283,109 Common Shares
                          Issuable Upon the Exercise of
                               Subscription Rights


                                TABLE OF CONTENTS

Prospectus Summary............................................................3
Risk Factors..................................................................8
The Offer....................................................................15
Use of Proceeds..............................................................24
Description of Securities....................................................26
Warrants.....................................................................27
Legal Matters................................................................30
Experts......................................................................30
Incorporation of Certain Information
   by Reference..............................................................30
Additional Information.......................................................30
Form of Subscription Certificate.....................................Appendix A
Form of Notice of
   Guaranteed Delivery...............................................Appendix B
Form of Nominee Holder Over-Subscription
   Exercise Form.....................................................Appendix C


                                  -------------
                                   PROSPECTUS
                                  -------------



                                 January 10, 1997





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

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


<PAGE>



                                     PART II

INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14.  Other Expenses of Issuance and Distribution

          The  estimated  expenses  of the  Registrant  in  connection  with the
issuance and  distribution  of the  securities  being  registered  hereby are as
follows:

Registration Fee-Securities and Exchange Commission   ...............$.1,984.02
NASD Listing Fee.......................................................3,000.00
Boston Stock Exchange Listing Fee......................................1,500.00
Printing and Engraving Expenses.......................................13,200.00
Accounting Fees.......................................................20,000.00
Legal Fees............................................................50,000.00
Blue Sky Expenses......................................................5,000.00
Subscription Agent ...................................................25,000.00
Miscellaneous Expenses.................................................3,315.98
       Total........................................................$123,000.00
                                                                      ==========


Item 15.  Indemnification of Directors and Officers.

          Section   317   of   the   California    Corporations   Code   permits
indemnification   of  directors,   officers,   employees  and  other  agents  of
corporations  under certain  conditions and subject to certain  limitations.  In
addition,  Section  204(a)(10)  of the  California  Corporations  Code permits a
corporation to provide,  in its articles of incorporation,  that directors shall
not have liability to the corporation or its  shareholders  for monetary damages
for breach of fiduciary duty, subject to certain prescribed exceptions.  Article
Four of the Articles of Incorporation of the Registrant  (Exhibit 3(a)) contains
provisions for the indemnification of directors,  officers,  employees and other
agents within the limitations permitted by Section 317 and for the limitation on
the personal liability of directors permitted by Section 204(b)(10),  subject to
the exceptions required thereby.



                                      II-1

<PAGE>



Item 16.  Exhibits and Financial Statement Schedules.

Exhibit
Numbers           Description

4.1     Specimen of Common Share Certificate.+

4.2     Form of Underwriter's Warrant.#

4.3     Form of Underwriter's Warrant.*

4.4     Form of Subscription Certificate. ++

5       Opinion of Counsel**

23.1    Consent of Deloitte & Touche LLP++

23.2    Consent of Counsel (included in Exhibit 5)++

+ Incorporated by reference to  Registration  Statement on Form S-1, File Number
33-44549 filed with the Securities and Exchange Commission on December 18, 1991,
and Amendment No. 1 and  Amendment No. 2 thereto filed with the  Securities  and
Exchange Commission on February 6, 1992 and March 7, 1992, respectively.

# Incorporated by reference to  Registration  Statement on Form S-1, File Number
33-48717 and  Post-Effective  Amendment No. 1 thereto filed with the  Securities
and Exchange Commission on June 22, 1992, and August 27, 1992, respectively.

* Incorporated by reference to Registration  Statement on Form S-1, File Number
33-73256 filed with the Securities and Exchange Commission on December 22, 1993,
and Amendment No.1 thereto filed with the Securities and Exchange  Commission on
February 24, 1994.

++ Filed herewith.


Item 17.  Undertakings.

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

                                      II-2

<PAGE>




 The undersigned registrant hereby undertakes:

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

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

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

     (iii) To  include  any  material  information  with  respect to the plan of
distribution  not  previously  disclosed  in the  registration  statement or any
material change to such information in the registration statement.

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

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

 The undersigned undertakes that:

 (1) For the purposes of determining  any liability  under the Securities Act of
1933, the information  omitted from the form of prospectus filed as part of this
registration  statement  in reliance  upon Rule 430A and  contained in a form of
prospectus  filed by the registrant  pursuant to Rule 424(b)(1) or (4) or 497(h)
under  the  Securities  Act  shall  be  deemed  to be part of this  registration
statement as of the time it was declared effective.


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

                                      II-3

<PAGE>


                                   SIGNATURES

Pursuant to the  requirements  of the  Securities  Act of 1933,  the  Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for filing on Form S-3 and has duly caused this  Amendment  to the
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly  authorized,  in the City of Berkeley,  State of  California  on January 9,
1997.

                                                         BIOTIME, INC.


                                                  By  /s/ Paul E. Segall
                                                      ----------------------
                                                      Paul E. Segall, President


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



<TABLE>
<CAPTION>
         Signature                          Title                                       Date
         ---------                          -----                                       ----
<S>                                 <C>                                                <C>

/s/ Paul E. Segall
- -------------------------------
Paul E. Segall, Ph.D.               President, Chief Executive Officer and              January 9, 1997
                                    Director (Principal Executive Officer)

/s/ Harold D. Waitz
- -------------------------------
Harold D. Waitz, Ph.D.              Vice President and Director                         January 9, 1997


/s/ Hal Sternberg
- -------------------------------
Hal Sternberg, Ph.D.                Vice President and Director                         January 9, 1997


/s/ Victoria Bellport
- -------------------------------
Victoria Bellport                   Chief Financial Officer and                         January 9, 1997
                                    Director (Principal Financial and
                                    Accounting Officer)
/s/ Judith Segall
- -------------------------------
Judith Segall                       Vice President, Corporate Secretary                 January 9, 1997
                                    and Director

/s/ Ronald S. Barkin
- -------------------------------
Ronald S. Barkin                    Director                                            January 9, 1997

</TABLE>



                                      II-4

<PAGE>


CONTROL NUMBER            BIOTIME, INC.            SUBSCRIPTION CERTIFICATE FOR

Expiration Date February 4, 1997                             SHARES
                                       SUBSCRIPTION PRICE U.S. $20.00 PER SHARE

                                                              CUSIP 09066L 11 3

                       SUBSCRIPTION CERTIFICATE FOR COMMON
               SHARES VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
             (NEW YORK TIME) ON FEBRUARY 4, 1997, THE EXPIRATION DATE.
                 THIS SUBSCRIPTION CERTIFICATE IS TRANSFERRABLE
           AND MAY BE COMBINED OR DIVIDED (BUT ONLY INTO SUBSCRIPTION
                CERTIFICATES EVIDENCING A WHOLE NUMBER OF RIGHTS)
                     AT THE OFFICE OF THE SUBSCRIPTION AGENT


THIS SUBSCRIPTION CERTIFICATE MAY BE USED TO SUBSCRIBE FOR
COMMON SHARES OR MAY BE ASSIGNED OR SOLD.  FULL INSTRUCTIONS
APPEAR ON THE BACK OF THIS SUBSCRIPTION CERTIFICATE.

REGISTERED OWNER:


     The registered  owner of this  Subscription  Certificate,  named above,  or
assignee, is entitled to the number of Rights to subscribe for Common Shares, no
par value,  of BioTime,  Inc. shown above,  in the ratio of one Common Share for
each ten Rights held,  pursuant to the Primary  Subscription  and upon the terms
and  conditions  and at  the  price  for  each  Common  Share  specified  in the
Prospectus dated January 10, 1997.


     If you  subscribe  for  fewer  than  all  the  shares  represented  by this
Subscription  Certificate,  the Subscription Agent will issue a new Subscription
Certificate  representing the balance of the unsubscribed Rights,  provided that
the  Subscription  Agent has  received  your  properly  completed  and  executed
Subscription  Certificate  and  payment  prior to 5:00 p.m.,  New York time,  on
February 3,  1997. No new  Subscription  Certificate  will be issued after that
date.
IMPORTANT:  Complete appropriate form on reverse


DATE:  _______________, 199__


                                                     BIOTIME, INC.


- -----------------------------           ----------------------------------
        SECRETARY                                    PRESIDENT

Countersigned:  American Stock Transfer & Trust Company (New York, N.Y.)
                Subscription Agent

                By: ___________________________________________________
                                    Authorized Signature


                                   Exhibit 4.4
<PAGE>

                        Expiration Date: February 4, 1997

                   PLEASE COMPLETE ALL APPLICABLE INFORMATION

By Mail:                   By Hand:                   By Overnight Courier:
To: American Stock         To: American Stock         To: American Stock
Transfer & Trust Company   Transfer & Trust Company   Transfer & Trust Company
40 Wall Street             40 Wall Street, 46th Floor 40 Wall Street, 46th Floor
New York, New York 10005   New York, New York 10005   New York, New York 10005

    SECTION     1: TO SUBSCRIBE:  I hereby irrevocably  subscribe for the dollar
                amount of Common Shares  indicated as the total of A and B below
                upon  the  terms  and  conditions  specified  in the  Prospectus
                related hereto, receipt of which is acknowledged.

                TO SELL:  If I have checked  either the box on line C or the box
                on line D, I  authorize  the sale of Rights by the  Subscription
                Agent  according to the procedures  described in the Prospectus.
                The check for the proceeds of sale will be mailed to the address
                of record.

    Please check |X| below:

 |_| A.  Primary Subscription ____________________ / 10 =
                              (Rights Exercised)

              .000      $ 20.00                  $
- ------------------  X   -------------------  =  ----------------------
(Shares Requested)      (Subscription Price)      (Amount Required)


 |_| B.  Over-Subscription Privilege

                   .000   $ 20.00                  $                  (*)
  --------------------  X --------------------  =  ----------------------
   (Shares Requested)     (Subscription Price)       (Amount Required)

Amount of Check Enclosed or Amount in Notice of Guaranteed  Delivery (total of A
+ B) = $
       ----------------

               Make check payable to the order of "BioTime, Inc."

            (*) The Over-Subscription  Privilege can be exercised by Record Date
Shareholders only, as described in the Prospectus.

    |_| C.  Sell any remaining unexercised Rights

    |_| D.  Sell all of my Rights.

      _______________________________________          
       Signature of Subscriber(s)/Seller(s)                                    

Please provide your telephone number              Day (___) ___________________
                                                Evening (___) _________________

Social Security Number or Tax ID Number: ______________________________________

       SECTION II: TO TRANSFER RIGHTS: (except pursuant to C and D above)

For value received,  ________________________of  the Rights  represented by this
Subscription Certificate are assigned to

  --------------------------------------------------------
    Social Security Number or Tax ID Number of Assignee   

  --------------------------------------------------------
            (Print Full Name of Assignee)


  --------------------------------------------------------
      Signature(s) of Assignor(s)

  --------------------------------------------------------
    (Print Full Address including postal Zip Code)

    The  signature(s)  must correspond with the name(s) as written upon the face
of this Subscription Certificate, in every particular, without alteration.

IMPORTANT:  For Transfer,  a Signature Guarantee must be provided by an eligible
financial institution which is a participant in a recognized signature guarantee
program.

    SIGNATURE GUARANTEED BY:

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

PROCEEDS  FROM THE SALE OF RIGHTS MAY BE SUBJECT TO  WITHHOLDING  OF U.S.  TAXES
UNLESS  THE  SELLER'S   CERTIFIED  U.S.  TAXPAYER   IDENTIFICATION   NUMBER  (OR
CERTIFICATION  REGARDING FOREIGN STATUS) IS ON FILE WITH THE SUBSCRIPTION  AGENT
AND THE SELLER IS NOT OTHERWISE SUBJECT TO U.S. BACKUP WITHHOLDING.

    |_| CHECK  HERE IF  RIGHTS  ARE  BEING  EXERCISED  PURSUANT  TO A NOTICE  OF
        GUARANTEED  DELIVERY  DELIVERED TO THE  SUBSCRIPTION  AGENT PRIOR TO THE
        DATE HEREOF AND COMPLETE THE FOLLOWING:

        NAME(S) OF REGISTERED OWNER(S):
        WINDOW TICKET NUMBER (IF ANY):
        DATE OF EXECUTION OF NOTICE OF GUARANTEED DELIVERY:
        NAME OF INSTITUTION WHICH GUARANTEED DELIVERY:



INDEPENDENT AUDITORS' CONSENT


We  consent  to the  incorporation  by  reference  in this  Amendment  No.  1 to
Registration  Statement No. 333-17321 of BioTime, Inc. on Form S-3 of our report
dated August 8, 1996 (which report expresses an unqualified opinion and includes
an  explanatory  paragraph  related to the  development  stage of the  Company's
operations),  appearing in the Annual  Report on Form 10-K of BioTime,  Inc. for
the year  ended  June 30,  1996 and to the  reference  to us under  the  heading
"Experts" in the Prospectus, which is part of this Registration Statement.


DELOITTE & TOUCHE LLP
San Francisco, California
January 7, 1997


                                   Law Offices
                  Lippenberger, Thompson, Welch and Soroko LLP
                              250 Montgomery Street
                                    Suite 500
                         San Francisco, California 94104
                                 (415) 421-5300
                               FAX: (415) 421-0225


                                          January 9, 1997


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

         Re:      BioTime, Inc.
                  Registration Statement on Form S-3

Ladies/Gentlemen:

         We are counsel to BioTime,  Inc. (the "Company") in connection with the
offer and sale of up to 283,109 Common Shares (the  "Shares")  issuable upon the
exercise of 2,831,084 subscription rights (the "Rights") that will be issued and
distributed  by the Company to the holders of record of its Common  Shares.  The
issuance of the Rights and the offer and sale of the Shares is being  registered
under  the  Securities  Act of 1933,  as  amended,  pursuant  to a  Registration
Statement on Form S-3, File No. 333-17321.

     We are of the opinion  that when the Rights are issued as  described in the
Registration  Statement,  the Rights will be the legally and validly  issued and
outstanding and will constitute binding obligations of the Company,  enforceable
in accordance  with their terms. We are also of the opinion that when the Shares
are issued and sold upon the  exercise of the  Rights,  in  accordance  with the
terms and provisions of the Rights and the  Registration  Statement,  the Shares
will  be  legally  and   validly   issued  and   outstanding,   fully  paid  and
nonassessable.

         The foregoing opinion is limited to the laws of the State of California
and the Federal laws of the United States of America.

         We  hereby  consent  to  the  use of our  opinion  in the  Registration
Statement.


                                      Very truly yours,

                                      Lippenberger, Thompson, Welch & Soroko LLP



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