BIOTIME INC
S-3, 1998-12-18
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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 As filed with the Securities and Exchange Commission on December 18, 1998

                                                  Registration No. ____________
===============================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    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, Chief Executive Officer
         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        (Name,  address,  including zip
 area code, of Registrant's principal    code, and telephone number, including
     executive offices)                    area code, of agent for 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 & Gilbert 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 Maximum
                                                                Amount             Proposed           Aggregate         Amount of
                                                                 to be         Maximum Offering   Offering Price(1)   Registration
   Title of Each Class of Securities to be Registered         Registered      Price Per Unit(1)                            Fee
- ---------------------------------------------------------- ------------------ ------------------- ------------------ --------------
<S>                                                        <C>                <C>                 <C>                 <C>
Common Shares, no par value(2)                                  501,629            $12.34           $6,190,101.86       $1,826.08
- ---------------------------------------------------------- ------------------ ------------------- ------------------ --------------
Common Share Subscription Rights                              10,032,579             --                  --                --
- ---------------------------------------------------------- ------------------ ------------------- ------------------ --------------
Common Shares, no par value(3)                                  250,000            $12.34           $3,085,000.00       $910.08
- ---------------------------------------------------------- ------------------ ------------------- ------------------ --------------
Total Registration Fee.................................................................................................$2,736.16
===================================================================================================================================
<FN>
(1) Estimated  solely for the purpose of calculating the registration fee. 
(2) Issuable upon exercise of the Common Share Subscription Rights.
(3) Issuable to fill Excess Over-Subscriptions.
</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.


===============================================================================
<PAGE>
                SUBJECT TO COMPLETION -- DATED DECEMBER 18, 1998

PROSPECTUS
                                  BIOTIME, INC.

                              501,629 COMMON SHARES

                Issuable Upon the Exercise of Subscription Rights


     BioTime, Inc. (the "Company" or "BioTime") is issuing new securities called
"Rights."  Holders of the Rights will be entitled to subscribe  for and purchase
up to an aggregate  of 501,629  BioTime  common  shares,  no par value  ("Common
Shares").  The Rights will be issued to BioTime  shareholders of record ("Record
Date Shareholders"), as of the close of business on January 5, 1999 (the "Record
Date").  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  will also be  considered  shareholders  of record and they will receive
Rights if they are Record Date  Shareholders.  Each Record Date Shareholder will
receive one Right for each Common  Share  owned on the Record  Date.  The Rights
will entitle the holder to subscribe  for and purchase  from the Company one new
Common Share for every 20 Rights held (the "Primary Subscription").  The Company
plans to offer up to 501,629 Common Shares through the Primary Subscription at a
subscription price of $________ per Common Share (the "Subscription Price"). The
Subscription  Price per Common  Share  will be not  greater  than  66.67% of the
average  of the last sale  price of the  Common  Shares in the  Nasdaq  National
Market for the last five trading days preceding the  commencement  of the Offer.
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  in  the  Primary   Subscription   (the   "Over-Subscription
Privilege").  If subscriptions  for Common Shares through the  Over-Subscription
Privilege  exceed  the  number of Common  Shares  available  for sale  after the
Primary Subscription ("Excess Over-Subscriptions"),  the Company may issue up to
250,000  additional  Common  Shares  to fill of all or a portion  of the  Excess
Over-Subscriptions.   The   issuance   of   Common   Shares   to   fill   Excess
Over-Subscriptions  may  dilute  the  percentage  ownership  interests  of other
shareholders.

     The  Company is  issuing  the Rights 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.   Generally,
shareholders who exercise their Rights in full in the Primary  Subscription will
be able to maintain their  pro rata share of the  Company's  outstanding  Common
Shares.  However,  if  the  Offer  is  oversubscribed  and  the  Company  issues
additional Common Shares to fill Excess Over-Subscriptions,  shareholders who do
not  purchase  their  pro rata  portion of those additional  shares  through the
Over-Subscription  Privilege  would  experience a reduction in their  percentage
interests in the Company's outstanding shares.

     THE   OFFER,   WHICH   INCLUDES   THE   PRIMARY    SUBSCRIPTION   AND   THE
OVER-SUBSCRIPTION  PRIVILEGE,  WILL  EXPIRE AT 5:00  P.M.  NEW YORK CITY TIME ON
_______, 1999 (the "Expiration Date"). Upon completion of the Offer, Record Date
Shareholders  who do not fully  exercise  their  Rights  should  expect to own a
smaller proportional interest in the Company than before the Offer.

     The Common Shares are authorized for trading on the Nasdaq  National Market
("Nasdaq")  under the symbol  BTIM.  The  Rights  will be  transferable  and are
expected  to be  approved  for  trading on Nasdaq  under the symbol  BTIMR.  The
Company announced the Offer on December ___, 1998. The last reported sale prices
of a Common Share on Nasdaq on December ___, 1998 and on __________,  1999 were
$_____ and $____, 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"
ON PAGE 10.
                             -----------------------

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<TABLE>
<CAPTION>
===============================================================================================
                                                        Price to            Proceeds to the
                                                       the Public             Company (1)
================================================= ---------------------- ======================
<S>                                                 <C>                   <C>
Per Share ......................................            $                      $
================================================= ====================== ======================
Total (2) ......................................            $                      $
================================================= ====================== ======================
<FN>
(1)  Before  deducting  expenses  of the  Offering  which  are  estimated  to be
     $_______. 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 if additional  Common
     Shares are issued to fill Excess Over-Subscriptions.
               The date of this Prospectus is December ____, 1998
</FN>
</TABLE>
<PAGE>












                      [This Page Intentionally Left Blank]












<PAGE>
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                               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.  Statements
contained  in this  Prospectus  that are not  historical  facts  may  constitute
forward-looking  statements  that are  subject to risks and  uncertainties  that
could cause actual results to differ materially from those discussed.  See "Risk
Factors."


                                   The Company

     BioTime,  Inc. (the  "Company" or  "BioTime")  is developing  aqueous based
synthetic  solutions  that can be used as blood plasma volume  expanders,  blood
replacement  solutions during hypothermic (low temperature)  surgery,  and organ
preservation  solutions.  Plasma volume  expanders  are used to treat  decreased
blood volume  resulting from blood loss in surgical or trauma  patients.  We are
developing  products that may be used in large  volumes,  especially  when blood
loss  becomes so severe  that a  transfusion  of packed red blood cells or other
blood  products is  required.  We are also  developing  a  specially  formulated
hypothermic blood replacement solution that would be used for the replacement of
a patient's  circulating  blood volume during cardiac surgery,  neurosurgery and
other  surgeries  that  involve  lowering  the  patient's  body  temperature.

     Our  first  three  blood  volume  replacement  products  are  Hextend,  (R)
PentaLyte,  (R) and  HetaCool.TM  Hextend  is our  proprietary  hetastarch-based
synthetic  blood plasma  volume  expander  designed  especially to treat loss of
volume in  surgery  and  trauma  care  patients.  PentaLyte  is our  proprietary
pentastarch-based  synthetic plasma expander designed  especially for use when a
faster  elimination of the starch component is desired and acceptable.  Although
Hextend can be used in these cases,  some physicians appear to prefer a solution
which could be  metabolized  faster and  excreted  earlier  when the longer term
protection  provided  by  Hextend  is  not  required.  HetaCool  is  a  modified
formulation of Hextend and is specifically designed for use at low temperatures.

     Hextend,  PentaLyte  and  HetaCool  have been  formulated  to maintain  the
patient's tissue and organ function by sustaining the patient's fluid volume and
physiological   balance.  Other  products  (known  as  colloid  and  crystalloid
solutions) are being marketed by other companies for use in maintaining  patient
fluid  volume in surgery and trauma  care,  but the use of those  solutions  can
contribute  to patient  morbidity,  including  conditions  such as  hypovolemia,
edema,  impaired blood clotting,  acidosis,  and other  biochemical  imbalances.
Hextend,  PentaLyte, and HetaCool contain ingredients that may prevent or reduce
the  physiological  imbalances that can cause those problems.  Albumin  produced
from human plasma is  expensive  and subject to supply  shortages,  and a recent
United  States  Food and  Drug  Administration  ("FDA")  warning  has  cautioned
physicians about the risk of administering albumin to seriously ill patients.

     During March 1998,  we completed the  submission of a New Drug  Application
("NDA") to the FDA, seeking approval to market Hextend in the United States. The
FDA has completed its review of our NDA, and during November 1998 we received an

- --------------------------------------------------------------------------------
                                       3
<PAGE>
- --------------------------------------------------------------------------------

action letter from them requesting several clarifications.  We have responded to
the FDA's request and are presently awaiting their approval.

     The NDA  includes  data from our Phase III  clinical  trials,  in which the
primary endpoints were successfully met when Hextend was used as a plasma volume
expander in surgery. An important goal of the Hextend development program was to
produce a product that can be used in multi-liter  volumes to treat patients who
have lost a large volume of blood.  An average of 1.6 liters of Hextend was used
in the clinical trials, and volumes ranging from two to five liters were used in
some of the higher  blood loss cases.  The safety  related  secondary  endpoints
targeted in the study included those involving coagulation.  We believe that the
low  incidence  of adverse  events  related  to blood  clotting  in the  Hextend
patients demonstrates that Hextend may be safely used in large amounts. However,
the FDA will make its own  evaluation of the clinical trial data and there is no
assurance that the FDA will approve the Company's NDA.

     On April 23, 1997, BioTime and Abbott Laboratories  ("Abbott") entered into
a License  Agreement  under which we granted to Abbott an  exclusive  license to
manufacture and sell Hextend in the United States and Canada for all therapeutic
uses other than those  involving  hypothermic  surgery,  or the  replacement  of
substantially  all of a patient's  circulating blood volume. We still retain all
rights to  manufacture,  sell or license Hextend and other products in all other
countries.

     Under the License Agreement, Abbott agreed to pay BioTime up to $40,000,000
in  license  fees  based  upon  product  sales and the  achievement  of  certain
milestones.  So far,  we have  received  $1,650,000  of  license  fee  milestone
payments.  In  addition  to the  license  fees,  Abbott will pay us a royalty on
annual net sales of Hextend. The royalty rate will be 5% plus an additional .22%
for each  $1,000,000 of total annual net sales,  up to a maximum  annual royalty
rate of 36%. The royalty rate for each year will be applied on a total net sales
basis so that once the highest royalty rate for a year is determined,  that rate
will be paid with respect to all sales for that year. Abbott's obligation to pay
royalties  on sales of Hextend  will expire in the United  States or Canada when
all patents  protecting  Hextend in the applicable  country expire and any third
party  obtains  certain  regulatory  approvals  to market a  generic  equivalent
product in that country.  Abbott also agreed to manufacture  Hextend for sale by
BioTime in the event that  Abbott's  exclusive  license is  terminated  prior to
expiration.

     In order to  preserve  its  rights  to  obtain  an  exclusive  license  for
PentaLyte  under the  License  Agreement,  Abbott  notified  us that Abbott will
supply  BioTime  with  batches  of  PentaLyte,  characterization  and  stability
studies,  and  other  regulatory  support  needed  for  BioTime  to file  for an
Investigation New Drug application ("IND") and to conduct clinical studies.

     We plan to enter global markets  through  licensing  agreements.  We are in
various  stages of  negotiations  to  license  our  products with pharmaceutical
companies  outside  the United  States and Canada.  By  licensing  our  products
abroad,  we will avoid the capital  costs and delays  inherent in  acquiring  or
establishing our own pharmaceutical manufacturing facilities and establishing an
international  marketing  organization.  We met  with  representatives  of Nihon
Pharmaceutical  Company,  Ltd.  ("Nihon") in Japan to discuss the development of
BioTime  products for the Japanese  market,  and the  development  of a clinical
trial program to obtain
- --------------------------------------------------------------------------------
                                       4
<PAGE>
- --------------------------------------------------------------------------------

Japanese  regulatory  approval.  Nihon  previously  signed a letter of intent to
negotiate a licensing agreement to manufacture and market our products in Japan.
Nihon  is  a  subsidiary  of  Takeda   Chemical   Industries,   Japan's  largest
pharmaceutical manufacturer.

     We are also pursuing a global clinical trial strategy, the goal of which is
to permit BioTime to obtain regulatory  approval for its products as quickly and
economically as practicable.  For example,  the United States Phase III clinical
trials of Hextend  involved  120  patients  and were  completed  in less than 12
months. Although regulatory requirements vary from country to country, we may be
able to file applications for foreign regulatory  approval of our products based
upon the results of the United States clinical  trials.  Based upon  discussions
with the  Canadian  Bureau  of  Pharmaceutical  Assessment,  we plan to file for
Canadian  market  approval based upon the results of our United States  clinical
trials.  Regulatory  approvals  for  countries  that are members of the European
Union  may be  obtained  through  a  mutual  recognition  procedure.  We plan to
determine  whether one or more member nations will accept an  application  based
upon the United States clinical trials. If approvals based upon those trials can
be  obtained  in the  requisite  number  of  member  nations,  then we  would be
permitted to market Hextend in all 16 member nations.

     We plan to conduct a pilot study of the use of Hextend to treat hypovolemia
in geriatric  patients  undergoing  high blood loss  surgery.  This new clinical
trial will be a double blind study designed to compare Hextend with a hetastarch
in saline solution and is intended to confirm and expand upon the results of the
United  States Phase III trials.  This pilot study may be used to design  larger
scale trials that may be needed to obtain regulatory approval in Western Europe.
Approximately  62  patients  65  years  of age or  older  will be  studied.  The
geriatric  population  generally  experiences a higher degree of inter-operative
and  post-operative  mortality and morbidity  than younger  patients  undergoing
similar major surgery.  We believe that in a study involving  geriatric patients
the  advantages  of Hextend  will most  clearly  and  consistently  be seen.  We
received  permission  to  conduct  the  study  from the  Department  of  Health,
Medicines  Control Agency of the United  Kingdom based upon our Clinical  Trials
Exemption  notification.  The trial will be conducted at the Middlesex and Royal
Free Hospitals of the University  College London  Hospitals in London,  England,
where it has been approved by the institutional review board.

     BioTime  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.

     Hextend(R) and PentaLyte(R) are registered trademarks,  and HetaCoolTM is a
trademark, of BioTime, Inc.

- --------------------------------------------------------------------------------
                                       5
<PAGE>
- --------------------------------------------------------------------------------

                              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  additional  clinical  trials of
Hextend,  clinical trials of HetaCool, and initial clinical trials of PentaLyte,
costs associated with seeking foreign regulatory approval of Hextend,  continued
research and product development,  and general and administrative  expenses. The
FDA has completed its review of our NDA for Hextend, and during November 1998 we
received an action letter from them requesting several  clarifications.  We have
responded to the FDA's request and are presently awaiting their approval. Abbott
Laboratories  has the  exclusive  right to market  Hextend in the United  States
following FDA approval,  but several months will elapse between the commencement
of marketing  and the payment of  royalties  and  licensing  fees on the sale of
Hextend by Abbott  Laboratories  or other companies that may obtain a license to
sell our products.  Until  BioTime  begins to receive  sufficient  revenues from
product sales and licensing  fees, we will have to finance our  operations  with
capital raised through the sale of equity securities.

     We are issuing the Rights to raise additional  capital without diluting the
ownership  interests of existing  shareholders who exercise their Rights (except
to the extent that the Company  issues  additional  Common Shares to fill Excess
Over-Subscriptions),  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.
Generally,  shareholders  who  exercise  their  Rights  in full  in the  Primary
Subscription  will be able to maintain  their  pro rata  share of the  Company's
outstanding  Common  Shares.  However,  if the Offer is  oversubscribed  and the
Company  issues  additional  Common  Shares to fill  Excess  Over-Subscriptions,
shareholders  who do not purchase  their  pro rata  portion of those  additional
shares through the  Over-Subscription  Privilege would experience a reduction in
their percentage interests in the Company's outstanding shares. 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 exercise their Rights may be viewed as
compensation  for the  possible  dilution  of  their  interest  in the  Company.
- --------------------------------------------------------------------------------
                                       6
<PAGE>
- --------------------------------------------------------------------------------

                               Terms of The Offer


 Securities Offered .....     BioTime is issuing new securities called "Rights."
          Holders of the Rights will be entitled to  subscribe  for and purchase
          up to an  aggregate of 501,629  BioTime  common  shares,  no par value
          ("Common Shares").  The Rights will be issued to BioTime  shareholders
          of record ("Record Date Shareholders"), as of the close of business on
          January 5, 1999 (the "Record  Date").  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 will also be
          considered shareholders of record and they will receive Rights if they
          are Record  Date  Shareholders.  Each  Record  Date  Shareholder  will
          receive one Right for each Common Share owned on the Record Date.  The
          Rights may be  exercised at any time during the  Subscription  Period,
          which  commences  on  __________,  1999 and ends at 5:00 p.m. New York
          time on _________, 1999 (the "Expiration Date").


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


 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
         in the Primary Subscription (the  "Over-Subscription  Privilege").  See
         "The  Offer--Over-Subscription  Privilege." If subscriptions for Common
         Shares  through the  Over-Subscription  Privilege  exceed the number of
         Common  Shares  available  for  sale  after  the  Primary  Subscription
         ("Excess   Over-Subscriptions"),   BioTime  may  issue  up  to  250,000
         additional  Common  Shares  to fill all of or a portion  of the  Excess
         Over-Subscriptions.  The  Company  will not be  obligated  to issue any
         Common  Shares to fill Excess  Over-Subscriptions,  but it may do so in
         its sole and  absolute  discretion.  The Company  reserves the right to
         limit  the   number  of  Common   Shares   issued  to  fill  an  Excess
         Over-Subscription from any single shareholder (or shareholders that are
         known or believed by the Company to be under  common  control or acting
         as a group for the purpose of acquiring Common Shares).

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                                       7
<PAGE>

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

 How to Exercise Rights .... The Rights will be evidenced by Subscription 
         Certificates,  which will be 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.


 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  expected to be  authorized  for
         trading  on  Nasdaq.  Trading  of the  Rights  will be  conducted  on a
         regular-way  basis from _________,  1999 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.


Participation by Officers,
Directors and Certain
Financial Consultants ....   Officers, directors, and certain financial 
         consultants of the Company who own, in the aggregate  2,341,989  Common
         Shares,  have  informed the Company that they intend to purchase in the
         Primary  Subscription  up to 117,099 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.


 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 ______, New York time on ________, 1999
         (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."

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                                       8
<PAGE>

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

 Important Dates to Remember .... Record Date: January 5, 1999
                                  Expiration Date: ___________, 1999
                                  Last Date of Guaranteed
                                  Delivery: ___________, 1999


 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 Expiration  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.


 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 additional clinical trials of 
         Hextend and  clinical  trials of  HetaCool  and  PentaLyte;  to finance
         further research and development of 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 expected to trade under the symbol "BTIMR."

- --------------------------------------------------------------------------------
                                       9
<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 WHICH COULD
MATERIALLY ADVERSELY AFFECT THE PROPOSED OPERATIONS AND PROSPECTS OF THE COMPANY
AND THE VALUE OF AN INVESTMENT  IN THE COMPANY.  THERE MAY BE OTHER FACTORS THAT
ARE NOT MENTIONED  HERE OR OF WHICH WE ARE NOT  PRESENTLY  AWARE THAT COULD ALSO
AFFECT BIOTIME'S OPERATIONS.

Development Stage Company

      BioTime  is in the  development  stage.  This  means  that  we  are  still
conducting  research and  developing  our  products,  and we have not  generated
significant  revenues.  We have not yet received FDA approval to sell any of our
products.  Because BioTime is still  developing our products and waiting for FDA
approval,  BioTime  will  sustain  additional  operating  losses.  There  is  no
assurance  that the Company will generate  sufficient  revenues from the sale or
licensing of its products and  technologies to be profitable.  We cannot be sure
when we will start receiving revenues from product sales because:


 o       Our products are not yet on the market;

 o       Our products cannot be sold until the products are approved by the FDA
         and foreign regulatory authorities;

 o       It often takes many months to obtain FDA approval of a new product; and

 o       It can take several months for a pharmaceutical company to introduce a 
         new product to the market.

Additional Financing Required

     We believe that our cash on hand will be  sufficient  to permit  BioTime to
continue in  operation  for at least 12 months.  We need the  proceeds  from the
offering to continue to finance our  operations for a longer  period of time. We
may need to raise additional  capital after the Offer to pay operating  expenses
until such time as we are able to  generate  sufficient  revenues  from  product
sales,  royalties,  and license fees.  There can be no assurance that we will be
able to raise additional funds on favorable terms or at all, or that such funds,
if raised,  will be  sufficient  to permit  BioTime  to  develop  and market its
products.  Unless the  Company is able to generate  sufficient  revenue or raise
additional  funds when  needed,  it is likely that it will be unable to continue
its planned  activities,  even if it is making  progress  with its  research and
development projects.

Uncertainty of Future Sales; Competition

      Our  ability to generate  operating  revenue  depends  upon our success in
developing  and  marketing  our  products.  There can be no  assurance  that any
products that receive FDA or foreign  regulatory  approval will be  successfully
marketed or that we will receive sufficient  revenues from product sales to meet
our  operating   expenses.   The  acceptance  of  the  Company's   products  and
technologies  by the  medical  profession  may  take  time  to  develop  because
physicians  and  hospitals may be reluctant to try a new product due to the high
degree of risk associated with the application of new  technologies and products
in the field of human medicine.

                                       10
<PAGE>


     Our plasma expander  products will compete with other  products,  including
albumin and other colloid solutions,  and crystalloid  solutions.  Some of these
products, in particular crystalloid solutions,  are commonly used in surgery and
trauma care and sell at low  prices.  In order to compete  with other  products,
particularly  those that sell at lower  prices,  BioTime  products  will have to
provide  medically  significant  advantages.  The  competing  products are being
manufactured  and marketed by  established  pharmaceutical  companies  with more
resources than BioTime. For example,  DuPont  Pharmaceuticals  presently markets
Hespan, an artificial plasma volume expander, and Viaspan, a solution for use in
the  preservation  of kidneys,  livers and pancreases  for surgical  transplant.
Abbott  manufactures and sells a generic  equivalent of Hespan.  There also is a
risk that the  Company's  competitors  may succeed in  developing  safer or more
effective  products that could render our products and technologies  obsolete or
noncompetitive.

Uncertainty as to Human Application of Products

      Although we believe that our Phase III  clinical  trials show that Hextend
is safe for use in human medicine, there is no assurance that the FDA will reach
the same conclusion. BioTime's other experimental products and technologies have
not been applied in human medicine and have only been used in laboratory studies
on animals and there can be no assurance  that those  products  will prove to be
safe and  efficacious  in the human  medical  applications  for which  they were
developed.

FDA and Other Regulatory Approvals Required

     The products that we develop cannot be sold until the FDA and corresponding
foreign regulatory  authorities approve the products for medical use. This means
that:


 o   We will have to conduct expensive and time consuming clinical trials of
     new products;

 o   We will incur the expense and delay inherent in seeking FDA approval of 
     new products;

 o   A product that is approved may be subject to restrictions on use;

 o   The FDA can recall or withdraw approval of a product if problems arise; and

 o   We will face similar regulatory issues in foreign countries.

                                       11
<PAGE>


     In order to obtain FDA and foreign regulatory approval of a new product, we
will have to conduct  laboratory tests and "clinical trials" in which the effect
of the product in human patients is studied. The purpose of regulatory review is
to assure that a new product is safe and effective. It can take several years to
complete the tests required by the FDA and foreign  regulators.  It is also very
expensive  to conduct  the tests and to prepare  the  applications  required  to
obtain legal approval to sell a new product. The manner in which each product is
manufactured  and  marketed  will also be subject to review and  approval by the
FDA.

     The data  obtained  from  laboratory  tests  and  clinical  trials  must be
reviewed and  interpreted by the FDA. That process often takes many months,  and
the FDA can deny  regulatory  approval if it  determines  that the data does not
show that the product is safe and  effective  for its intended use. In addition,
delays or rejections  may be  encountered  as a result of changes in FDA policy.
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.
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.

     The FDA continues to review approved  products,  and the  manufacturer  and
manufacturing  facilities.  The FDA can impose  restrictions on a product or the
FDA may order the  withdrawal  of the  product  from the market,  if  previously
unknown problems with a product,  manufacturer,  or  manufacturing  facility are
discovered.  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.

Uncertainty as to Results of Research and Development of New Products

     We are attempting to develop new medical  products and  technologies.  Such
experimentation  is inherently  costly,  time  consuming and uncertain as to its
results.  If we are  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, 1998,  we spent  $10,638,545  on research and
development,  and we  expect  to  continue  to incur  substantial  research  and
development expenses.

Absence of Manufacturing and Marketing Capabilities

     The Company  presently  does not have  adequate  facilities or resources to
manufacture its products and the hydroxyethyl  starches used in its products. We
plan to enter into arrangements with pharmaceutical companies for the production
and marketing of BioTime  products.  We have granted Abbott an exclusive license
to manufacture  and market  Hextend in the United States and Canada.  Although a
number of other  pharmaceutical  companies  have  expressed  their  interest  in
obtaining   licenses  to  manufacture  and  market  BioTime  products  in  other
countries,  there can be no assurance  that we will be  successful  making other
licensing  arrangements.  If licensing or manufacturing  arrangements  cannot be
made  on  acceptable  terms,  we will  have  to  construct  or  acquire  our own
manufacturing facilities and to establish our own marketing organization,  which
would entail significant expenditures of time and money.

                                       12
<PAGE>


Uncertainty of Patent Protection

      BioTime has patents in the United States,  Israel,  and South Africa,  and
has filed patent applications in other foreign countries,  for certain products,
including Hextend,  HetaCool, and PentaLyte.  No assurance can be given that any
additional patents will be issued to us, or that, if issued,  those 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 we might not have
the resources available to defend our patent rights.

Uncertainty of Health Care Reimbursement and Reform

      Success in selling the Company's products may depend in part on the extent
to which health insurance companies,  HMOs, and government health administration
authorities  such as Medicare and Medicaid will pay for the cost of the products
and related treatment. There can be no assurance that adequate health insurance,
HMO, and government coverage will be available to permit our products to be sold
at prices high enough for us to generate a profit.  In some  foreign  countries,
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.

Dependence Upon Key Personnel

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

Year 2000 Considerations

     Because we do not have our own  pharmaceutical  production  facilities,  we
will rely upon Abbott and others to manufacture and distribute our products.  If
year 2000 problems were to impede the ability of those  companies to manufacture
and distribute our products or to provide raw materials used in the  manufacture
of our products,  our future sales could be adversely affected. We do not have a
contingency plan to address those problems if they were to arise, and we may not
be able to  replace  Abbott or any other  company  that may  obtain a license to
manufacture and distribute our products. Abbott has announced the implementation
of a program to assess and  remedy  any year 2000  problems  that may affect its
operations,  and has asked its key  suppliers to certify that their  systems are
year  2000  compliant.   The  results  of  the  year  2000  compliance  programs
implemented by Abbott and its suppliers are not presently known.

No Dividends

      The Company has not paid any cash dividends on its Common Shares.  For the
foreseeable  future we  anticipate  that any earnings  generated in our business
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.  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 in response to certain  events such as  unfavorable  results of clinical

                                       13
<PAGE>


trials or a delay or  failure  to obtain  FDA  approval.  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  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 the Nasdaq National Market, which
has 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 $4,000,000 of net tangible assets,  or at least $50,000,000 of
total assets,  or a market  capitalization of at least  $50,000,000,  or to have
generated  at least  $50,000,000  of revenue.  Although the Company had a market
capitalization in excess of $50,000,000 on the date of this Prospectus, and will
have net  tangible  assets in excess of  $4,000,000  if a  sufficient  number of
Common Shares are sold in the Offer,  future losses from operations  could cause
the Company's net tangible assets or market  capitalization to decline below the
Nasdaq  listing  criteria in the future.  If the Common  Shares are  delisted by
Nasdaq,  trading in the Common  Shares  could  thereafter  be  conducted  on the
over-the-counter  market  on the  Nasdaq  SmallCap  Market  or on an  electronic
bulletin board  established  for securities  that do not meet the Nasdaq listing
requirements. If the Common Shares were delisted from the Nasdaq National Market
and were not listed on the Nasdaq SmallCap Market,  they would be subject to the
so-called penny stock rules that impose restrictive sales practice  requirements
on  broker-dealers  who sell such  securities.  Consequently,  delisting,  if it
occurred,  could affect the ability of  shareholders to sell their Common Shares
in the secondary market.

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  Rights to subscribe for Common  Shares.  The Rights
will be issued to Record Date Shareholders. 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 to acquire at
the Subscription Price one Common Share for each 20 Rights held. Any Record Date
Shareholder who is issued fewer than 20 Rights may subscribe for one full Common
Share at the  Subscription  Price.  The Rights will be evidenced by Subscription
Certificates  (see Appendix A) which will be mailed to Record Date  Shareholders
other than Record  Date  Shareholders  whose  record  addresses  are outside the
United States ( the United  States also includes 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 5:00 p.m.,  New York City time, on  ______________,
1999, (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
any Common Shares that are 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 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 not be allowed
to rescind a purchase after the  Subscription  Agent has received  payment.  See
"Payment of Shares"  below.  Common  Shares  issued  pursuant to the exercise of
Rights will be listed on Nasdaq.

     The Rights are  transferable  until the Expiration Date and are expected to
be listed 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 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  Common

                                       15
<PAGE>


Shares will not be issued,  Record Date  shareholders  who receive fewer than 20
Rights will be entitled to purchase one Common Share.  Record Date  Shareholders
who, after exercising their Rights, are left with fewer than 20 Rights,  will be
unable to exercise  those  remaining  Rights and will not be entitled to receive
any cash from the Company in lieu of those 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  2,341,989  Common Shares,  have informed the Company that
they intend to purchase in the Primary  Subscription up to 117,099 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 BioTime 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  additional  clinical  trials of Hextend and
initial  clinical  trials of PentaLyte,  costs  associated  with seeking foreign
regulatory approval of Hextend, continued research and product development,  and
general and administrative  expenses. The Company is waiting for FDA approval to
market Hextend in the United States. Abbott Laboratories has the exclusive right
to market  Hextend in the United  States  following  FDA  approval,  but several
months will elapse  between the  commencement  of  marketing  and the payment of
royalties and licensing fees on the sale of Hextend. Until the Company begins to
receive  sufficient  revenues from product sales and licensing  fees from Abbott
Laboratories  or other  companies  that may  obtain a  license  to sell  Company
products, it will have to finance its operations with capital raised through the
sale of equity securities.

                                       16
<PAGE>


     The Offer provides an opportunity for BioTime to raise  additional  capital
without diluting the ownership  interests of existing  shareholders who exercise
their Rights  (except to the extent that the Company  issues  additional  Common
Shares to fill  Excess  Over-Subscriptions),  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.  Generally, shareholders who exercise their Rights in full
in the Primary Subscription will be able to maintain their pro rata share of the
Company's outstanding Common Shares. However, if the Offer is oversubscribed and
the Company issues additional  Common Shares to fill Excess  Over-Subscriptions,
shareholders  who do not  purchase their  pro rata  portion of those  additional
shares through the  Over-Subscription  Privilege would experience a reduction in
their percentage interests in the Company's outstanding shares. 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 exercise their Rights may be viewed as
compensation for the possible dilution of their interest in the Company.

     We considered other financing  alternatives,  including a private placement
or underwritten public offering 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 BioTime  shareholders  because the shares would have
been sold to new investors.  In the case of a private placement,  the sale would
probably  have been made at a discount to market.  In  contrast,  the Offer will
permit the Company to incur lower  transaction  fees in raising capital and will
permit the  shareholders  who exercise  their Rights to enjoy the price discount
that might  otherwise  have been realized by new  investors.  During January and
February 1997, the Company  conducted a similar  subscription  rights offer that
was  over-subscribed,  leading the Company to conclude that the Offer might be a
better alternative to the other sources of financing.

The Subscription Price

     The  Subscription  Price for the Common Shares to be issued pursuant to the
Rights is  $___________.  We announced the Offer on December ___, 1998. The last
reported  sale price of the Common  Shares on Nasdaq on December  ___,  1998 and
________, 1999, was $_____ and $_____, respectively.

Expiration of the Offer

     The Offer will  expire at 5:00 p.m.,  New York City  time,  on  __________,
1999, the Expiration Date. Rights will expire on the Expiration Date and may not
be exercised after that date.

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

                                       17
<PAGE>


"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 20 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 20
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  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.

                                       18
<PAGE>


     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  number of  Common  Shares  available  for sale  after  the  Primary
Subscription ("Excess Over-Subscriptions"),  the Company may issue up to 250,000
additional   Common   Shares  to  fill  all of  or  a  portion  of  the  Excess
Over-Subscriptions.   The   issuance   of   Common   Shares   to   fill   Excess
Over-Subscriptions  may  dilute  the  percentage  ownership  interests  of other
shareholders.

     The Company will not be obligated to issue any Common Shares to fill Excess
Over-Subscriptions,  but it may do so in its sole and absolute  discretion.  The
Company  reserves the right to limit the number of Common  Shares issued to fill
an Excess  Over-Subscription  from any single  shareholder (or shareholders that
are known or believed by the Company to be under  common  control or acting as a
group for the purpose of acquiring Common Shares).

                                       19
<PAGE>


     Subject to the right of the  Company  to limit the number of Common  Shares
issuable to any shareholder,  if the amount of Excess Over-Subscriptions exceeds
250,000  shares (or such lesser number of shares that the Company  determines to
issue to fill Excess  Over-Subscriptions),  the available  Common Shares will be
allocated  among  those  who  over-subscribe  based  on  the  number  of  Rights
originally  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.

                                       20
<PAGE>


     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  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 (the "Protect Period").

      A Rights  holder  will not be  allowed  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.

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 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.

                                       21
<PAGE>


     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.

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 Expiration Date to a later date; (c)
change the Record Date prior to 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.

     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.

                                       22
<PAGE>


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 $__________, 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.

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.

                                       23
<PAGE>


     4. Any gain or loss on the sale of a Right  will be  treated  as a  capital
gain or loss if the 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 the  501,629
Common Shares in the Offer are estimated to be $_________,  after  deducting the
expenses  of the Offer of  approximately  $_________,  but  without  taking into

                                       24
<PAGE>


account any Common  Shares  that may be sold to fill Excess  Over-Subscriptions.
The Company intends to use the net proceeds of the Offer as follows:

    Application              Estimated Amount                  Percent of Total
    -----------              ----------------                  ----------------
 Research and Development    $                                 50%
 Working Capital                                               50              
                                                               ---
 Total                       $                                 100%
                             =========                         ====
 

     Research and  Development.  Proceeds  allocated to research and development
will be used to finance further clinical testing of Hextend,  clinical trials of
HetaCool,  initial clinical trials of PentaLyte, and laboratory testing of other
products 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.

     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.   Proceeds  allocated  to  working  capital  also  may  be
reallocated  to  research  and  development  and may be used to pay the costs of
clinical trials of Hextend and other products.

     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.  We believe that our cash on hand will be  sufficient to
permit  BioTime to continue  in  operation  for at least 12 months.  We need the
proceeds  from the offering to continue to finance our  operations  for a longer
period of time. The Company may need to raise additional capital after the Offer
to pay operating  expenses until such time as it is able to generate  sufficient
revenues from product sales, royalties, and license fees.

     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 40,000,000  Common Shares,  no par value, of which 10,032,579  shares were
outstanding  at November 12, 1998 and held by __________  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>

                                  LEGAL MATTERS

     The  validity  of the Rights and Common  Shares will be passed upon for the
Company by Lippenberger,  Thompson,  Welch, Soroko & Gilbert LLP, San Francisco,
California. A member of Lippenberger, Thompson, Welch, Soroko & Gilbert LLP owns
options to purchase 30,000 Common Shares.


                                     EXPERTS

     The financial statements of BioTime,  Inc. as of June 30, 1997 and 1998 and
for  each  of the  three  fiscal  years  in  the  period  ended  June  30,  1998
incorporated by reference in this Prospectus from the Company's Annual Report on
Form 10-K for the year  ended  June 30,  1998 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 incorporated herein by reference),
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's Form 10-K for the fiscal year ended June 30, 1998,  Form 10-Q
for the three months ended  September  30, 1998,  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 has announced
that it will change its fiscal year end from June 30 to December  31. The change
will take effect on December 31, 1998.  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 but not delivered with
this Prospectus.  Such requests may be addressed to the Secretary of the Company
at 935 Pardee Street, Berkeley, California 94710; Telephone: (510) 845-9535.

     The Company is subject to the informational  requirements of the Securities
Exchange Act of 1934, as amended,  and in accordance  therewith files quarterly,
annual,  and current reports and proxy statements and other information with the
Securities and Exchange  Commission.  The public may read and copy any materials
the Company files with  Securities and Exchange  Commission at the  Commission's
Public  Reference Room at 450 Fifth Street,  N.W.,  Washington,  D.C. 20549. The
public may obtain  information on the operation of the Public  Reference Room by
calling the Commission at 1-800-SEC-0330.

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


                                       27
<PAGE>

                             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  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.

                                       28
<PAGE>




CONTROL NUMBER      BIOTIME, INC.                  SUBSCRIPTION CERTIFICATE FOR

Expiration Date __________, 1999                             SHARES
                                          SUBSCRIPTION PRICE U.S. $___ PER SHARE

                                                               CUSIP

                       SUBSCRIPTION CERTIFICATE FOR COMMON
               SHARES VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
             (NEW YORK TIME) ON _______, 1999, THE EXPIRATION DATE.
                 THIS SUBSCRIPTION CERTIFICATE IS TRANSFERABLE
           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 20 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 ____________, 1999.


     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
___________,  1999. No new  Subscription  Certificate  will be issued after that
date.

IMPORTANT:  Complete appropriate form on reverse

DATE:  _______________, 1999


                                                     BIOTIME, INC.


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

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

                By: ___________________________________________________
                                    Authorized Signature



                                   APPENDIX A

<PAGE>

                         Expiration Date: ________, 1999

                   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 ____________________ / 20 =
                              (Rights Exercised)

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

  _
 |_| B.  Over-Subscription Privilege

                  .000    $                        $                  (*)
  --------------------  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  (______,  1999,  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 (______,  1999, 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 _______, 1999 (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  ___________,  1999,  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
    $_________________  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
    |_| money order

- --------------------------------------------------- 
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:                  , 1999


*   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 _______,  1999 (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:             , 1999


<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.







                            TABLE OF CONTENTS

         Prospectus Summary                         3
         Risk Factors                              10
         The Offer                                 15
         Use of Proceeds                           24
         Description of Securities                 25
         Legal Matters                             26
         Experts                                   26
         Incorporation of Certain Information
            by Reference                           26
         Additional Information                    27
         Form of Subscription Certificate  Appendix A
         Form of Notice of
            Guaranteed Delivery            Appendix B
         Form of Nominee Holder Over-Subscription
            Exercise Form                  Appendix C




                                  BIOTIME, INC.




                              501,629 Common Shares
                Issuable Upon the Exercise of Subscription Rights







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




                                  December __, 1998






<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   ...........$2,736.16
     NASDAQ Listing Fee......................................................$*
     Printing and Engraving Expenses..........................................*
     Accounting Fees..........................................................*
     Legal Fees...............................................................*
     Subscription Agent ......................................................*
     Miscellaneous Expenses..............................................___*__
                Total................................................$     *   
- -----------------
* To be completed by amendment



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  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.+

4.4       Form of Subscription Certificate. ++

5         Opinion of Counsel**

23        Consent of Deloitte & Touche LLP++


+ 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.

++ Filed herewith.

** To be filed by amendment.


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.


 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-2
<PAGE>


(ii)ab 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)ab  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)ab 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)ab 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 has
duly  caused  this  Registration  Statement  to be signed  on its  behalf by the
undersigned,  thereunto  duly  authorized,  in the  City of  Berkeley,  State of
California on December 17, 1998.

                                            BIOTIME, INC.


                                         By Paul Segall
                                            -----------------
                                            Paul Segall, Chief Executive Officer


 Pursuant to the  requirements of the Securities Act of 1933, this  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                   Chief Executive Officer and Director
- -------------------------------      (Principal Executive Officer)                      December 17, 1998
Paul E. Segall, Ph.D.                              
                                    

/s/ Ronald S. Barkin                 President and Director                             December 17, 1998
- -------------------------------
/s/ Ronald S. Barkin                


/s/ Harold Waitz                     Vice President and Director                        December 17, 1998
- -------------------------------
Harold Waitz, Ph.D.                


/s/ Hal Sternberg                    Vice President and Director                        December 17, 1998
- -------------------------------
Hal Sternberg, Ph.D.


/s/ Victoria Bellport                Chief Financial Officer and                        December 17, 1998
- -------------------------------      Director (Principal Financial and
Victoria Bellport                    Accounting Officer)


/s/ Judith Segall                    Secretary and Director                             December 17, 1998
- -------------------------------
Judith Segall


                                     Director                                           December 17, 1998
- -------------------------------
Jeffrey B. Nickel


                                     Director                                           December 17, 1998
- -------------------------------
Milton H. Dresner

</TABLE>

                                     II-4


CONTROL NUMBER      BIOTIME, INC.                  SUBSCRIPTION CERTIFICATE FOR

Expiration Date __________, 1999                             SHARES
                                          SUBSCRIPTION PRICE U.S. $___ PER SHARE

                                                               CUSIP

                       SUBSCRIPTION CERTIFICATE FOR COMMON
               SHARES VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
             (NEW YORK TIME) ON _______, 1999, 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 20 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 ____________, 1999.


     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
___________,  1999. No new  Subscription  Certificate  will be issued after that
date.

IMPORTANT:  Complete appropriate form on reverse

DATE:  _______________, 1999


                                                     BIOTIME, INC.


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

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

                By: ___________________________________________________
                                    Authorized Signature


                                   
<PAGE>

                         Expiration Date: ________, 1999

                   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 ____________________ / 20 =
                              (Rights Exercised)

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

  _
 |_| B.  Over-Subscription Privilege

                  .000    $                        $                  (*)
  --------------------  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  Registration  Statement of
BioTime,  Inc. on Form S-3 of our report dated August 18, 1998 (which  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,  1998 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
December 17, 1998


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