BIOTIME INC
S-3/A, 1999-01-28
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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   As filed with the Securities and Exchange Commission on January 28, 1999
                                                     Registration No. 333-69179
================================================================================
    

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                               ----------------
   
                                AMENDMENT NO. 1
                                      TO
    
                                   FORM S-3
                         REGISTRATION STATEMENT UNDER
                          THE SECURITIES ACT OF 1933
                               ----------------
                                 BIOTIME, INC.
               (Exact name of Registrant as specified in charter)
                               ----------------
           California                                         94-3127919        
 (State or other jurisdiction of                           (I.R.S. Employer     
 incorporation or organization)                          Identification Number) 
                                
                               935 Pardee Street
                          Berkeley, California 94710
                                (510) 845-9535
                         (Address, including zip code,
                  and telephone number, including area code,
                  of Registrant's principal executive offices)

                    Paul E. Segall, Chief Executive Officer
                                 BioTime, Inc.
                               935 Pardee Street
                          Berkeley, California 94710
                                 (510) 845-9535
           (Name, address, including zip code, and telephone number,
                   including 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. [ ]


   
                                                       (Continued on next page.)
================================================================================
    

<PAGE>
   
================================================================================
(Continued from front cover.)
    

<TABLE>
   
                                        CALCULATION OF REGISTRATION FEE
==============================================================================================================
<CAPTION>
                                                          Proposed          Proposed
                                            Amount        Maximum            Maximum         Amount of
   Title of Each Class of Securities        to be      Offering Price       Aggregate       Registration
            to be Registered              Registered    Per Unit(1)     Offering Price(1)       Fee
- --------------------------------------------------------------------------------------------------------------
<S>                                      <C>          <C>              <C>                 <C>
Common Shares, no par value(2) .........   501,629         $12.34         $6,190,101.86     $  1,826.08(3)
- --------------------------------------------------------------------------------------------------------------
Common Share Subscription Rights  ......  10,032,579         --                --          --
- --------------------------------------------------------------------------------------------------------------
Common Shares, no par value(2) .........      25           $16.50         $      412.50     $       .12(4)
- --------------------------------------------------------------------------------------------------------------
Common Share Subscription Rights  ......     500             --                --          --
- --------------------------------------------------------------------------------------------------------------
Common Shares, no par value(5) .........   250,000         $12.34         $3,085,000.00     $    910.08(3)
- --------------------------------------------------------------------------------------------------------------
Total Registration Fee   ...............................................................    $  2,736.28
==============================================================================================================
<FN>
(1) Estimated solely for the purpose of calculating the registration fee.
(2) Issuable upon exercise of the Common Share Subscription Rights.
(3) Previously paid.
(4) Paid herewith.
(5) 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>


PROSPECTUS

[GRAPHIC OMITTED]

   
                                 BIOTIME, INC.
                             501,654 COMMON SHARES
    

               Issuable Upon the Exercise of Subscription Rights


   
     BioTime,  Inc. is issuing new securities  called  "Rights."  Holders of the
Rights will be entitled to purchase up to an aggregate of 501,654 BioTime common
shares.  You will receive  Rights from BioTime if you owned BioTime shares as of
the close of business on January 5, 1999, which has been set as the record date.
If your shares were held in the name of Cede & Co. as nominee for The Depository
Trust Company,  or in the name of any other depository or nominee, on the record
date, you will also receive  Rights.  You will receive one Right for each common
share  that you  owned on the  record  date.  The  Rights  will  entitle  you to
subscribe  for and  purchase  one new common share for every 20 Rights you hold.
The subscription price is $_____________ per share.

  The Rights will expire at 5:00 p.m. New York City time on __________, 1999.

     By  exercising  your Rights, you will be able to purchase BioTime shares at
a   price   below   market,   without   incurring   broker's   commissions.   By
over-subscribing,  you  may be able to purchase any shares that are left over by
shareholders  who  fail  to  exercise their Rights. BioTime may also issue up to
250,000 additional shares to fill over-subscriptions.

     The  common shares are authorized for trading on the Nasdaq National Market
under  the  symbol  BTIM. The Rights will be transferable and are expected to be
approved for trading on the Nasdaq SmallCap Market under the symbol BTIMR.
    

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

   
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 7.
    

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

   
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  Rights offer which are estimated to be
    $115,000. No underwriting discounts or commissions will be paid.
(2) Assumes  all of the Rights are exercised. Does not include any proceeds that
    may   be   received   if   additional  common  shares  are  issued  to  fill
    over-subscriptions.


</FN>
</TABLE>
    


   
                The date of this prospectus is January ______, 1999
    

    

<PAGE>

                      [This Page Intentionally Left Blank]


<PAGE>

                               PROSPECTUS SUMMARY

   
     The  following  summary  explains  only  some  of  the  information in this
prospectus.  More  detailed  information about BioTime and the Rights offer, and
financial  statements  appear  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  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,  even  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  and  PentaLyte  are our  proprietary
hydroxyethyl  starch-based  synthetic blood plasma volume expanders  designed to
treat loss of blood  volume in surgery  and trauma  care  patients.  Hextend and
PentaLyte  may be used in similar  surgical  and  trauma  care  procedures,  but
PentaLyte is designed especially for use when a faster elimination of the starch
component  is desired  and  acceptable.  HetaCool is a modified  formulation  of
Hextend and is specifically designed for use at low temperatures.

     We  have  completed  the submission of a new drug application to the United
States  Food  and Drug Administration, seeking approval to market Hextend in the
United  States.  The FDA has completed its review of our application, and during
November  1998  we  received  an  action  letter  from  them  requesting several
clarifications.  We  have  responded  to  the FDA's request and we are presently
awaiting their approval.

     BioTime  and  Abbott  Laboratories  have  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.
 

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

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


                                       3


<PAGE>


   
                          Purpose of the Rights Offer


     The  Board  of Directors of BioTime has determined that it is necessary for
BioTime  to  raise  additional  capital  at this time to finance its operations,
including:

     o Costs of conducting additional clinical trials of BioTime products;

     o Costs of seeking foreign regulatory approval of Hextend;

     o Continued research and product development; and

     o General and administrative expenses.

     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   BioTime  issues  additional  common  shares  to  fill
over-subscriptions),  and  without paying underwriting commissions and expenses.
Shareholders  who  exercise  their  Rights  will be able to purchase shares at a
price below market, without incurring broker's commissions.

     Generally,  shareholders  who exercise their Rights in full will be able to
maintain  their  prorata  share of BioTime's outstanding common shares. However,
if  the  Rights  offer  is  over-subscribed and BioTime issues additional common
shares  to  fill  over-subscriptions,  shareholders  who  do  not purchase their
prorata  portion of those additional shares by over-subscribing would experience
a  reduction  in their percentage interests in BioTime's outstanding shares. The
distribution  of  the Rights to shareholders will also afford those shareholders
who  choose  not  to  exercise  their  Rights  the potential of receiving a cash
payment  upon  the  sale  of  their  Rights. Therefore, the receipt of Rights by
shareholders  who  choose  not  to  exercise  their  Rights  may  be  viewed  as
compensation for the possible dilution.



                           Terms of The Rights 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 501,654  BioTime  common  shares.  You
                    will receive Rights from BioTime if you owned BioTime shares
                    as of the close of  business  on January 5, 1999,  which has
                    been set as the record date. If your shares were held in the
                    name of Cede & Co.  as  nominee  for  The  Depository  Trust
                    Company,  or in the name of any other depository or nominee,
                    on the record date, you will also receive  Rights.  You will
                    receive  one Right for each  common  share that you owned on
                    the record  date.  The Rights will  entitle you to subscribe
                    for and  purchase  one new common  share for every 20 Rights
                    you hold. 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.

Subscription
   Price ...........The subscription price per common share is $______.
    

                                       4

<PAGE>

   
Over-Subscription
   Privilege .......Shareholders  who fully exercise the Rights initially issued
                    to them will be  entitled  to the  additional  privilege  of
                    subscribing   for  and  purchasing  any  common  shares  not
                    acquired  by  other  holders  of  Rights.  See  "The  Rights
                    Offer--Over-Subscription  Privilege." If  over-subscriptions
                    for  common  shares  exceed  the  number  of  common  shares
                    available  for  sale,   BioTime  may  issue  up  to  250,000
                    additional  common  shares to fill all or a  portion  of the
                    over- subscriptions.  BioTime will not be obligated to issue
                    any additional common shares to fill over-subscriptions, but
                    it may do so in its sole and absolute discretion.

How to Exercise
   Rights ..........The Rights will be evidenced by  subscription  certificates,
                    which will be distributed to shareholders.  You may exercise
                    your Rights 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 Rights  Offer--Payment for Shares").  Rights must
                    be exercised no later than the expiration  date. You may not
                    rescind a purchase after exercising your 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.  BioTime  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
                    BioTime who own, in the aggregate,  2,341,989 common shares,
                    have  informed  BioTime  that they  intend to purchase up to
                    117,099   common  shares  through  the  exercise  of  Rights
                    distributed  to  them,   provided  that  suitable  financial
                    arrangements  can be made, but they are not legally bound to
                    do so.
    

                                       5

<PAGE>

   
Foreign
   Restrictions ....Subscription certificates will not be mailed to shareholders
                    whose addresses of record are outside the United States. The
                    Rights  will be held by the  subscription  agent for foreign
                    shareholders'  accounts until  instructions  are received to
                    exercise,  sell or transfer the Rights.  If no  instructions
                    are  received by 12:00 noon,  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 foreign  shareholders.  The net proceeds,  if any,
                    from such a sale will be paid to the foreign shareholders on
                    a   prorata   basis.   See   "The   Rights    Offer--Foreign
                    Shareholders."

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

Amendment,
   Extension or
   Termination of
   the Rights
   Offer ...........BioTime reserves the right, in its sole discretion,  to: (a)
                    terminate  the Rights  offer prior to delivery of the common
                    shares for which Rights holders have subscribed;  (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 Rights
                    offer.
    

                                       6


<PAGE>



   
                                 RISK FACTORS

     An  investment  in  the  Common  Shares involves a high degree of risk. You
should  purchase  the  common  shares only if you can afford to lose your entire
investment.  Before  deciding  to  purchase  any of the common shares offered by
this   prospectus,  you  should  consider  the  following  factors  which  could
materially  adversely  affect  the  proposed operations and prospects of BioTime
and  the  value of an investment in BioTime. 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.


Our Products Are Not Yet on the Market

     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 We have not yet received  FDA  approval to sell any of our  products;
           and

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

We May Not Succeed In Marketing Our Products

     Our  ability  to  generate  operating  revenue  depends upon our success in
developing  and  marketing  our  products. There can be no assurance that any of
our  products  will  be successfully marketed or that we will receive sufficient
revenues  from product sales to meet our operating expenses or to earn a profit.
 
         o 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.
    

         o 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.

   
         o In order to compete with other products, particularly those that sell
           at lower  prices,  BioTime  products  will have to be  recognized  as
           providing medically significant advantages.

         o 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.

         o There  also is a risk  that  BioTime's  competitors  may  succeed  in
           developing  safer or more  effective  products  that could render our
           products and technologies obsolete or noncompetitive.


Many of Our Products and Technologies are Experimental

         o We are attempting to develop new medical products and technologies.

         o Many of BioTime's  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.

         o The  experimentation  we are  doing is  costly,  time  consuming  and
           uncertain as to its results.

         o 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.
    


                                       7


<PAGE>

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.


   
We May Need Additional Financing

     We  believe  that  our cash on hand will be sufficient to permit BioTime to
continue  in  operation  for  at least 12 months. We expect to continue to incur
substantial  research, product development, and regulatory expenses. We may need
to  raise  additional  capital  after the Rights offer to pay operating expenses
until   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 any funds raised
will  be sufficient to permit BioTime to develop and market its products. Unless
BioTime  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.


We Lack Manufacturing and Marketing Capabilities

     BioTime  presently  does  not  have  adequate  facilities  or  resources to
manufacture  its  products or the hydroxyethyl starches used in its products. We
have  granted  Abbott  an exclusive license to manufacture and market Hextend in
the  United  States  and  Canada,  and  we  plan to enter into arrangements with
pharmaceutical  companies  for  the production and marketing of BioTime products
in  other  countries.  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.


Our Patents May Not Protect Our Products

     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  BioTime  with  meaningful  patent  protection,  or that others will not
successfully  challenge  the  validity or enforceability of any patent issued to
BioTime.  The  costs required to uphold the validity and prevent infringement of
any  patent  issued  to  BioTime 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 BioTime'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.
    


                                       8


<PAGE>

   
We Depend Upon Key Personnel

     BioTime  depends  to a considerable degree on the continued services of its
executive  officers.  Although  BioTime  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
BioTime.  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.
Our  future  sales  could  be  adversely  affected 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.
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.


We Do Not Pay Dividends

     BioTime  does  not  pay  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 BioTime and will not be paid out as
dividends  to  our shareholders. This means that our stock may not be a suitable
investment for anyone who needs to earn income from their investments.


The Market for Our Common Shares Has Been Volatile

     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 BioTime shares 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 BioTime shares
may  fall  rapidly  in response to certain events such as unfavorable results of
clinical  trials or a delay or failure to obtain FDA approval. In the event that
BioTime  achieves  earnings  from  the sale of products, securities analysts may
begin  predicting  quarterly earnings. The failure of BioTime's earnings to meet
analysts'  expectations  could  result  in  a  significant  rapid decline in the
market  price  of  BioTime'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. Broad market fluctuations, as well as general
economic  and political conditions, may adversely affect the market price of the
common shares.


We Might Not Meet the Requirements for Continued Listing on Nasdaq

     BioTime'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  rules  for  continued  listing  on  the Nasdaq National
Market,  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
BioTime  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 Rights offer, future losses
from   operations   could   cause   BioTime's  net  tangible  assets  or  market
capitalization  to  decline  below the Nasdaq listing criteria in the future. If
the  common  shares are delisted from the Nasdaq National Market, trading in the
common  shares  could  be  conducted  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
    


                                       9


<PAGE>

   
so-called  penny stock rules that impose restrictive sales practice requirements
on  broker-dealers  who  sell  those  securities. Consequently, delisting, if it
occurred,  could  affect the ability of shareholders to sell their common shares
in the secondary market.


We Will Have Broad Discretion on the Use of Proceeds

     Management  of BioTime will have broad discretion in determining the use to
which  the  net  proceeds  of  the  Rights  offer  will  be put. This means that
investors  will  not  be  able to evaluate our spending plans before they decide
whether to exercise or sell their Rights.
    

   
                                  THE COMPANY

     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,  even  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, PentaLyte,
and   HetaCool.   Hextend   and   PentaLyte  are  our  proprietary  hydroxyethyl
starch-based  synthetic  blood plasma volume expanders designed to treat loss of
blood  volume  in surgery and trauma care patients. Hextend and PentaLyte may be
used  in  similar surgical and trauma care procedures, but PentaLyte is designed
especially  for use when a faster elimination of the starch component is desired
and   acceptable.   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
FDA  warning has cautioned physicians about the risk of administering albumin to
seriously ill patients.

     We  have  completed  the  submission  of a new drug application to the FDA,
seeking  approval  to market Hextend in the United States. The FDA has completed
its  review  of  our application, and during November 1998 we received an action
letter  from  them  requesting  several clarifications. We have responded to the
FDA's request and we are presently awaiting their approval.

     The  new drug application 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
BioTime's new drug application.

     On  April  23, 1997, BioTime and Abbott Laboratories 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.
 

                                      10
<PAGE>

     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  an
investigational new drug application and to conduct clinical studies.

     We   plan  to  enter  global  markets  through  licensing  agreements  with
over-seas  pharmaceutical companies. We are in various stages of negotiations to
license  our  products  to  pharmaceutical  companies  in  countries 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.

     A  number  of  pharmaceutical  companies  in Europe, Asia and other markets
around  the  world  have  expressed  their  interest  in  obtaining  licenses to
manufacture  and  market  BioTime products. We met with representatives of Nihon
Pharmaceutical  Company,  Ltd.  in  Japan  to discuss the development of BioTime
products  for  the  Japanese  market,  and  the  development of a clinical trial
program  to  obtain  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  are conducting a pilot study of the use of Hextend to treat hypovolemia
in  geriatric  patients  undergoing  high  blood loss surgery. This new clinical
trial  is  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. The trial
is  being  conducted at the Middlesex and Royal Free Hospitals of the University
College London Hospitals in London, England.
    



                                       11
<PAGE>

   
                                THE RIGHTS OFFER


Issuance of Rights

     BioTime  is  issuing Rights to subscribe for common shares. The Rights will
be  issued  to shareholders who owned BioTime shares as of the close of business
on  January 5, 1999, which has been set as 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, on the record date
will  also  receive  Rights.  Each shareholder will be issued one Right for each
common  share owned on the record date. No fractional Rights will be issued. The
Rights  entitle  the holders to acquire one common share for each 20 Rights held
by  paying  the  subscription price. Any 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  shareholders  other than foreign shareholders whose record
addresses  are  outside  the  United States (the United States also includes the
District of Columbia, U.S. territories and possessions).

     The  Rights issued to foreign shareholders will be held by the subscription
agent  for  their  accounts  until  instructions  are  received  to exercise (if
permissible  under  applicable foreign securities laws), sell, or transfer those
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 shareholders on
Nasdaq.  The  net  proceeds  from  the  sale of those Rights will be paid to the
foreign shareholders. See "Sale of Rights".

     Officers,  directors, and certain financial consultants of BioTime who own,
in  the  aggregate,  2,341,989  common  shares,  have informed BioTime that they
intend  to  purchase  up  to  117,099  common shares through the exercise of the
Rights  distributed  to  them, provided that suitable financial arrangements can
be  made, but they are not legally bound to do so. Any common shares acquired by
officers,  directors  and other persons who are "affiliates" of BioTime, as that
term  is  defined  under  the  Securities  Act  of  1933,  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 BioTime 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 the 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 BioTime.


Purpose of the Rights Offer

     The  Board  of Directors of BioTime has determined that it is necessary for
BioTime  to  raise  additional  capital  at this time to finance its operations,
including:

         o Costs of conducting additional clinical trials of BioTime products;

         o Costs of seeking foreign regulatory approval of Hextend;

         o Continued research and product development; and

         o General and administrative expenses.

     BioTime  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 BioTime begins to receive sufficient revenues
from  product  sales  and licensing fees from Abbott or other companies that may
obtain  a  license  to  sell  BioTime  products,  it  will  have  to finance its
operations  with  its  cash  on  hand,  the funds received from shareholders who
exercise  their Rights, and any additional capital raised through other sales of
equity securities.

     The  Rights  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 BioTime issues additional
common  shares  to  fill  over-subscriptions),  and  without paying underwriting
commissions
    


                                       12
<PAGE>

   
and  expenses.  Shareholders  who exercise their Rights will be able to purchase
BioTime  shares at a price below market, without incurring broker's commissions.
Generally,  shareholders  who  exercise  their  Rights  in  full will be able to
maintain  their  prorata  share of BioTime's outstanding common shares. However,
if  the  Rights  offer  is  over-subscribed and BioTime issues additional common
shares to fill over-subscriptions,   shareholders  who  do  not  purchase  their
prorata  portion  of  those  additional  shares  through  the  over-subscription
privilege  would  experience  a  reduction  in  their  percentage  interests  in
BioTime's  outstanding  shares.  The  distribution of the Rights to shareholders
will  also afford those shareholders who choose not to exercise their Rights the
potential  of receiving a cash payment upon the sale of their Rights. Therefore,
the  receipt  of  Rights by shareholders who choose not to exercise their Rights
may  be  viewed  as  compensation for the possible dilution of their interest in
BioTime.

     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 sale of
shares  through  the Rights offer will permit BioTime 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, BioTime conducted a similar
subscription rights offer that was over-subscribed,  leading BioTime to conclude
that  the  Rights  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 offer is $______. We announced the Rights offer on December 18, 1998. The
last reported sale price of the common shares on Nasdaq on December 18, 1998 and
January ______, 1999, was $______ and $______, respectively.

Expiration of the Rights Offer

     The  Rights  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

   
     In order to exercise your Rights you must do all of the following:

         o Fill in and sign the  reverse  side of the  subscription  certificate
           which accompanies this prospectus;

         o Deliver the  completed  and signed  subscription  certificate  to the
           subscription  agent with your  payment in full for the common  shares
           you wish to purchase.  You may use the enclosed  envelope to mail the
           subscription certificate and payment to the subscription agent or you
           may arrange for one of the alternative  methods of delivery described
           below.

         o The method of making payment for your shares is described below under
           "Payment for Shares."

         o Properly  completed and executed  subscription  certificates  must be
           received by the subscription agent at the offices of the subscription
           agent at the address  set forth  below  prior to 5:00 p.m.,  New York
           City time,  on the  expiration  date,  unless  payment is effected by
           means of a notice of  guaranteed  delivery as  described  below under
           "Payment for Shares."

         o Rights may also be exercised  through a broker,  who may charge you a
           servicing fee.

     You  should  send  your  signed  subscription  certificates, accompanied by
payment  of  the  subscription price, to American Stock Transfer & Trust Company
(the subscription agent), by one of the methods described below:
    

                                       13
<PAGE>


(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

   
     You  should confirm that your facsimile has been received by contacting the
subscription  agent  by  telephone  at  (718)  921-8200.  If  you  deliver  your
subscription  certificate by telecopier, you must send the original subscription
certificate to the subscription agent by mail or hand delivery.

               DO NOT SEND SUBSCRIPTION CERTIFICATES TO BIOTIME.

     A  subscription  will  be  deemed  accepted  by the subscription agent when
payment,   together   with   a  properly  completed  and  executed  subscription
certificate,  is  received  by  the  subscription  agent  at its Corporate Stock
Transfer Department.

     If  you  are  issued  fewer  than 20 Rights, you may subscribe for one full
common  share.  Fractional  shares  will  not be issued, and if after exercising
your  Rights  you  are  left  with fewer than 20 Rights, you will not be able to
exercise your remaining Rights.

     If  you  do not indicate the number of Rights you are exercising, or if you
do  not  deliver full payment of the subscription price for the number of shares
that  you  indicate  you  are  subscribing  for, then you will be deemed to have
exercised  Rights  to purchase the maximum number of common shares determined by
dividing  the  total  subscription  price you paid by the subscription price per
share.

     If  you  submit  payment  for more shares than may be purchased through the
regular  exercise  of  your  Rights,  your excess payment will be deemed to be a
subscription   payment  for  additional  shares  through  the  over-subscription
privilege.  The  number  of  additional  shares  that you will be deemed to have
subscribed  for  in  the  over-subscription  privilege  will  be  determined  by
dividing the amount of the excess payment by the subscription price per share.

     All  questions concerning the timeliness, validity, form and eligibility of
any  exercise  of  Rights  or  subscriptions  pursuant  to the over-subscription
privilege  will  be determined by BioTime. BioTime's determination will be final
and   binding.   BioTime  in  its  sole  discretion  may  waive  any  defect  or
irregularity,  or  may permit any defect or irregularity to be corrected, within
such  time  as  BioTime  may determine. BioTime may reject, in whole or in part,
the  purported  exercise  of  any  Right  or  any  subscription  pursuant to the
over-subscription  privilege. Neither BioTime 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
over-subscription   privilege,   or  the  payment  of  the  subscription  price.
Subscriptions  through the exercise of Rights or the over-subscription privilege
will  not  be  deemed  to  have  been  received or accepted by BioTime until all
irregularities  or  defects  have  been  waived  by  BioTime  or  cured  to  the
satisfaction  of,  and  within  the  time  allotted  by,  BioTime  in  its  sole
discretion.
    


Over-Subscription Privilege

   
     The  over-subscription  privilege  may  allow  you  to  acquire more common
shares  than  the  number  issuable  upon  the  exercise of the Rights initially
issued  to  you. By exercising the over-subscription privilege, you may purchase
any  shares  that  are  left  over  by  shareholders  who fail to exercise their
Rights.
    



                                       14
<PAGE>



   
     The  over-subscription  privilege  may  only be exercised by Rights holders
who  were  shareholders  on  the  record date and who exercise all of the Rights
they  received  from  BioTime. Any person who purchases Rights and who was not a
shareholder   on   the  record  date  may  not  exercise  the  over-subscription
privilege.  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.

     If  you  are  eligible  to exercise the over-subscription privilege and you
wish  to  do  so,  you should indicate on your subscription certificate how many
common   shares  you  are  willing  to  acquire  through  the  over-subscription
privilege.  If  sufficient  common  shares remain unsold, all over-subscriptions
will be honored in full.

     If  you  were a shareholder on the record date and you wish to exercise the
over-subscription  privilege  through The Depository Trust Corporation, you must
properly  execute  and  deliver  to  the  subscription  agent  a DTC Participant
Over-Subscription  Form, together with payment of the subscription price for the
number  of common shares that you wish to purchase through the over-subscription
privilege.  Copies of the DTC Participant Over-Subscription Form may be obtained
from   the   subscription   agent.   Your   properly  executed  DTC  Participant
Over-Subscription  Form  and  payment must be received by the subscription agent
at or prior to 5:00 p.m., New York City time on the expiration date.

     If  you are eligible to exercise the over-subscription privilege but you do
not  deliver  full  payment  of  the subscription price for the number of shares
that  you  indicate  you  are  subscribing  for  through  the  over-subscription
privilege,  then  you  will  be  deemed  to have exercised the over-subscription
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 you purchased through the full exercise of your
Rights) by the subscription price per share.

     If  subscriptions for common shares through the over-subscription privilege
exceed  the  initial  501,654 common shares being offered by BioTime through the
exercise  of  the  Rights,  BioTime  may  issue  up to 250,000 additional common
shares  to  fill  all  or  a  portion of the over-subscriptions. The issuance of
additional  common  shares  to fill over-subscriptions may dilute the percentage
ownership interests of other shareholders.

     BioTime  will  not  be  obligated  to  issue  any  common  shares  to  fill
over-subscriptions,  but  it  may  do  so  in  its sole and absolute discretion.
BioTime  reserves  the right to limit the number of common shares issued to fill
an  over-subscription  from any single shareholder or from shareholders that are
known  or  believed  by  BioTime to be under common control or acting as a group
for the purpose of acquiring common shares.

     Subject  to  the  right  of  BioTime  to  limit the number of common shares
issuable  to  any  shareholder,  if  the Rights offer is over-subscribed so that
over-subscriptions  cannot  be  filled in full, 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
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 available common shares each over-subscribing
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 prorata basis. If you are not allocated
the   full   amount   of   shares   that  you  subscribe  for  pursuant  to  the
over-subscription  privilege,  you  will  receive  a  refund of the subscription
price  you  paid  for shares that are not allocated to and purchased by you. The
refund will be made by a check mailed by the subscription agent.
    


Payment for Shares

   
     If  you  wish  to exercise your Rights or to acquire common shares pursuant
to  the  over-subscription  privilege,  you  may  choose  between  the following
methods of payment:
    


                                       15
<PAGE>

   
         1. You may send to the  subscription  agent full payment for all of the
     common shares you wish to acquire,  including any additional  common shares
     that you desire to acquire through the over-subscription  privilege (if you
     are entitled to exercise the over-subscription  privilege).  Make sure that
     your  payment is  accompanied  by your  completed  and signed  subscription
     certificate.  The 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 BioTime pending proration and
     distribution  of common  shares.  The  interest  earned on the account will
     belong to BioTime.

     TO BE  ACCEPTED,  A PAYMENT  PURSUANT  TO THIS  METHOD  MUST BE MADE IN THE
     FOLLOWING MANNER:

         o The payment must be in U.S. dollars;

         o The payment  must be by money order or check drawn on a bank  located
           in the United States;

         o The payment must be payable to BioTime, Inc.; and

         o The  payment  must  accompany  a  properly   completed  and  executed
           subscription certificate.

         2.  Alternatively,  a subscription will be accepted by the subscription
     agent  if 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, including
     any   additional   common   shares   subscribed   for   pursuant   to   the
     over-subscription  privilege,  and (ii) a properly  completed  and executed
     subscription  certificate.  The  notice  of  guaranteed  delivery  must  be
     received by the subscription agent before 5:00 p.m., New York City time, on
     the  expiration  date.  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.

     You  will  not  be  allowed to rescind your purchase after the subscription
agent  has  received  payment either by means of a notice of guaranteed delivery
or a check or money order.

     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  the  common  shares as soon as possible to ascertain the
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  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  are transferable until the expiration date and are expected to
be  listed  for trading on the Nasdaq SmallCap Market. 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.

     You  may  transfer  some  or  all the Rights evidenced by your subscription
certificate  by following these instructions and the instructions on the back of
your  subscription  certificate. If you wish to transfer all of your Rights, you
need  only sign your subscription certificate and deliver it to the subscription
agent.  If  you  wish to transfer some but not all of your Rights, you must also
deliver  to  the subscription agent a subscription certificate properly endorsed
for  transfer  with instructions to register the portion of the Rights evidenced
by  the  subscription  certificate  in the name of the transferee and to issue a
new  subscription  certificate to the transferee evidencing the number of Rights
transferred.  In  that  event,  a  new  subscription  certificate evidencing the
balance  of  the  Rights  will  be  issued  to you or, if you so instruct, to an
additional transferee.
    


                                       16


<PAGE>

   
     If  you  wish to transfer all or a portion of your Rights, you 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 you with respect to retained Rights, if
any;  and  (iii)  the Rights evidenced by the new subscription certificate to be
exercised  or  sold  by the recipients. BioTime 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.

     BioTime  anticipates  that the Rights will be eligible for transfer through
the facilities of The Depository Trust Company.

     Except  for  the fees charged by the subscription agent (which will be paid
by  BioTime),  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 those commissions, fees or expenses will be paid by BioTime or the
subscription agent.


Amendment, Extension or Termination of the Rights Offer

     BioTime  reserves  the right, in its sole discretion, to: (a) terminate the
Rights  offer  prior  to  delivery of the common shares for which Rights holders
have  subscribed; (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 Rights offer. If BioTime amends the terms of the
Rights  offer,  an  amended  prospectus  will be distributed to you if you are a
holder  of  record  of Rights or if you previously exercised any of your Rights.
If  you  exercised  your  Rights  prior to the amendment or within four business
days  after  the  mailing  of  the  amended  prospectus,  you  will be given the
opportunity  to  confirm the exercise of your Rights by executing and delivering
a consent form.

     If  you  exercise  Rights  before  or  within four days after mailing of an
amended  prospectus relating to an amendment of the Rights offer and you fail to
deliver,  in  a  proper and timely manner, a properly executed consent form, you
will  be  deemed  to have rejected the amended terms of the Rights offer and you
will  be  deemed  to  have elected to revoke in full the exercise of your Rights
and  the  over-subscription privilege. If your exercise of Rights is so revoked,
the full amount of the subscription price you paid will be returned to you.

     If  your  executed subscription certificate is received by the subscription
agent  more  than four days after the mailing of an amended prospectus, you will
be  deemed  to have accepted the amended terms of the Rights offer in connection
with the exercise of your Rights and the over-subscription privilege.

     If  BioTime  elects  to  terminate  the  Rights offer before delivering the
common  shares for which you subscribed, the subscription price you paid will be
returned  to  you  by mail. Except for the obligation to return the subscription
price  you  paid when you attempted to exercise your Rights, neither BioTime nor
the  subscription  agent  will  have  any  obligation or liability to you in the
event of an amendment or termination of the Rights offer.
    


Delivery of Share Certificates

   
     Certificates  representing  the  common  shares you purchased by exercising
your  Rights  will  be delivered to you as soon as practicable after your Rights
have  been  validly  exercised  and  full payment for the common shares has been
received  and  cleared.  Certificates  representing  common  shares you purchase
pursuant  to the over-subscription privilege will be delivered to you as soon as
practicable  after  the  expiration  date  and  after  all allocations have been
effected.  It  is  expected that the certificates will be available for delivery
three business days following the expiration date.
    


Subscription Agent

   
     The  subscription  agent  is American Stock Transfer & Trust Company, which
will  receive  for  its administrative, processing, invoicing and other services
as  subscription agent, a fee estimated to be $25,000, and reimbursement for all
out-of-pocket  expenses  related  to the Rights offer. The subscription agent is
also   BioTime's   transfer   agent   and  registrar.  Questions  regarding  the
subscription certificates
    


                                       17


<PAGE>

   
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 Rights 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) zero,  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,
     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) 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,  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;  (b) zero,  to a holder of common  shares to
     whom it is issued and who  allows the Right to expire;  and (c) the cost to
     acquire the Right, to anyone who purchases a Right in the market.

         3. The holding period of a Right received by a holder of a common share
     includes the holding period of the common share.

         4. Any gain or loss on the sale of a Right will be treated as a capital
     gain or loss if the Right is a capital asset in the hands of the seller.  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
withheld   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.
Shareholders  and  other  Rights  holders  should  consult  their  tax  advisers
concerning the tax consequences of the Rights offer.
    


Special Considerations

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


                                       18


<PAGE>

                                USE OF PROCEEDS

   
     The  net  proceeds  received by BioTime from the sale of the 501,654 common
shares  in  the  Rights  offer are estimated to be $       , after deducting the
expenses  of the Rights offer of approximately $115,000, but without taking into
account  any  common  shares that may be sold to fill excess over-subscriptions.
BioTime intends to use the net proceeds of the Rights 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 clinical testing of Hextend, HetaCool, and PentaLyte,
and  laboratory  testing  of  other  products  being  developed by BioTime. 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. BioTime  intends  to apply the balance of the proceeds of
the  Rights  offer  to working capital and general corporate purposes. BioTime's
management  will  have  broad  discretion  with  respect  to the use of proceeds
retained  as  working  capital.  The  proceeds  may  be  used to defray overhead
expenses  and for future opportunities and contingencies that may arise. BioTime
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,  and  to  expand  BioTime's  research facilities. 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  lease of BioTime's present office and research facility will expire on
June  30,  1999 and we need additional space to expand our research facility. We
expect  to  enter  into  an  extension of the lease of our present facility that
would  include  some additional space for expansion. However, we are considering
a  number  of alternative opportunities to acquire additional research space. We
might  lease  or  purchase  a  larger building that would provide more expansion
space,  if we can do so on terms that we deem beneficial to BioTime. The cost of
expanding  our  present  facilities  or  acquiring  a  new  facility  will vary,
depending  upon  the amount of space we obtain, the extent to which improvements
must be built, and the terms on which we may lease or purchase the space.

   
     The  foregoing  table  represents only an estimate of the allocation of the
net  proceeds  of  the  Rights  offer  based upon the current state of BioTime'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 BioTime to make a reallocation of proceeds among the
categories  shown  above  or to other uses. BioTime may need to raise additional
capital  after  the Rights offer to pay operating expenses until such time as it
is  able  to  generate  sufficient  revenues  from product sales, royalties, and
license fees.

     Although  BioTime is not presently a party to any agreement, arrangement or
plan  to  acquire  any  assets  or  technology from a third party, BioTime might
determine  that  it is necessary or advantageous to make such an acquisition, or
BioTime  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  Rights offer will be invested in
certificates  of  deposit,  United  States  government  securities or other high
quality, short-term interest-bearing investments.
    


                                       19


<PAGE>

                           DESCRIPTION OF SECURITIES


Common Shares

   
     BioTime's  Articles of Incorporation currently authorize the issuance of up
to  40,000,000  common  shares,  no  par  value, of which 10,033,079 shares were
outstanding  at  January  5, 1999 and held by 6,918 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  that purpose. BioTime 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, BioTime 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  prorata  basis all remaining assets of BioTime available for
distribution  to  the  holders of common shares in the event of the liquidation,
dissolution,  or winding up of BioTime. Holders of common shares do not have any
preemptive  rights  to  become subscribers or purchasers of additional shares of
any class of BioTime's capital stock.
    


Preferred Shares

   
     BioTime'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
BioTime  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 BioTime. 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 BioTime 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.
    

                                 LEGAL MATTERS

   
     The  validity  of  the  Rights  and  common  shares will be passed upon for
BioTime  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 BioTime'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  BioTime'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.
    

                                       20


<PAGE>

               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

   
     BioTime'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
BioTime  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  incorporated  into  this  prospectus  by reference. BioTime has announced a
change  of  its  fiscal  year  end  from June 30 to December 31. The change took
effect  on  December  31,  1998.  BioTime  will  provide  without charge to each
person,  including any beneficial owner, to whom a prospectus is delivered, upon
written  or oral request, 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 BioTime at 935 Pardee Street, Berkeley,
California 94710; Telephone: (510) 845-9535.

     BioTime  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
BioTime  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.


                            ADDITIONAL INFORMATION

   
     BioTime  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  by  this prospectus. 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 BioTime and the
securities  offered  by  this  prospectus, reference is made to the registration
statement,  including  the  exhibits, 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. In each instance
reference  is  made  to  the  copy of the contract or other document filed as an
exhibit  to  the registration statement, and each such statement is qualified in
all respects by reference to the exhibit.
    


                                       21


<PAGE>

                                              
CONTROL NUMBER                   BIOTIME, INC.     SUBSCRIPTION CERTIFICATE FOR

   
                   SUBSCRIPTION CERTIFICATE FOR COMMON SHARES
                  VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
             (NEW YORK TIME) ON ______, 1999, THE EXPIRATION DATE.        RIGHTS
                 THIS SUBSCRIPTION CERTIFICATE IS TRANSFERRABLE
                         AND MAY BE COMBINED OR DIVIDED
Expiration Date ______, 1999  (BUT ONLY INTO SUBSCRIPTION     SUBSCRIPTION PRICE
               CERTIFICATES EVIDENCING A WHOLE NUMBER OF RIGHTS)    U.S. $______
                    AT THE OFFICE OF THE SUBSCRIPTION AGENT            PER SHARE

                                                               CUSIP 09066L 12 1
    

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,  and upon the terms  and  conditions  and at the price for each
Common Share specified in the Prospectus dated ______, 1999.


If you  exercise  fewer than all the  Rights  represented  by this  Subscription
Certificate,  the subscription  agent will issue a new Subscription  Certificate
representing  the  balance  of  the  unexercised   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



   
- --------------------------------------------------------------------------------
                            CHIEF EXECUTIVE OFFICER
    


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

         By: ___________________________________________
             Authorized Signature


                                   APPENDIX A

                                      A-1

<PAGE>
<TABLE>
<CAPTION>

                                                   Expiration Date: ______, 1999


                   PLEASE COMPLETE ALL APPLICABLE INFORMATION
<S>                                       <C>                                        <C>

     By Mail:                                 By Hand:                                   By Overnight Courier:      
 To: America Stock                        To: America 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. Subscription                    divided by 20 =              .000 x $                   = $
                    ------------------                 ------------------  --------------------  ----------------
                    (Rights Exercised)                 (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 certain shareholders only, as described in the
           Prospectus.
    

[ ] C. Sell any remaining unexercised Rights

[ ] D. Sell all of my Rights.

_______________________________________ Please provide your telephone number    Day (___)___________________________
Signature of Subscriber(s)/Seller(s)                                        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:
</TABLE>

                                      A-2


<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 RIGHTS OFFER

     As  set  forth  in  the  Prospectus  under  "The  Rights 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 Rights offer. 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:                            By Overnight Courier:
American Stock Transfer & Trust Company  American Stock Transfer & Trust Company
         40 Wall Street, 46th Floor            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 to the  Subscription  Agent  and must  deliver  this  Notice  of
Guaranteed  Delivery  guaranteeing  delivery  of (i)  payment  in  full  for all
subscribed   shares   (including   any  shares   subscribed   for   through  the
over-subscription   privilege)  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.
    
 

                                      B-1


<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 Rights offer  (including the  over-subscription
privilege,  if applicable) as  subscription  for such Common Shares as indicated
herein or in the Subscription Certificate.
    

<TABLE>
<CAPTION>
<S>                                             <C>
   
- -------------------------------------------     -----------------------------------------------
Number of Common Shares subscribed for          Number of Common Shares subscribed for
(excluding the over-subscription privilege)     pursuant to the over-subscription privilege for
for which you are guaranteeing delivery         which you are guaranteeing delivery of
of Rights and payment                           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
</TABLE>

* 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.


                                      B-2


<PAGE>

<TABLE>
                                  APPENDIX C
           [Form of Nominee Holder Over-Subscription Exercise Form]

   
                                 BIOTIME, INC.
                                 RIGHTS OFFER
                NOMINEE HOLDER OVER-SUBSCRIPTION EXERCISE FORM
                  PLEASE COMPLETE ALL APPLICABLE INFORMATION
<CAPTION>
<S>                                      <C>                                        <C>
    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  SUBSCRIPTION  RIGHTS  WERE  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  OFFER 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 all of the 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 Rights 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 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 Subscription Confirmation Number                      Name of Nominee Holder


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

                                                                      --------------------------------------------------
     Contact Name _________________________________________           City                State            Zip Code 
                                                                      
                                                                      By: ______________________________________________
     Phone Number _________________________________________

                                                                      Name: ____________________________________________
                                                                      

   
     Dated: ______, 1999                                              Title: ___________________________________________


     *   PLEASE COMPLETE THE BENEFICIAL OWNER  CERTIFICATION  ON THE BACK HEREOF  CONTAINING THE RECORD DATE POSITION OF
         RIGHTS  OWNED,  THE  NUMBER  OF  SHARES  SUBSCRIBED  FOR  (OTHER  THAN  OVER-SUBSCRIPTIONS)  AND THE  NUMBER OF
         OVER-SUBSCRIPTION SHARES, IF APPLICABLE, REQUESTED BY EACH SUCH OWNER.
</TABLE>
    


                                      C-1


<PAGE>

<TABLE>
                                                      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.  ("BioTime")  pursuant to the Rights offer  described  and provided for in
BioTime's Prospectus dated _______, 1999 (the "Prospectus") hereby certifies to BioTime and to American Stock Transfer &
Trust Company,  as Subscription Agent for such Rights 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, 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:
    

<CAPTION>
   
                                                                              Number of Shares Requested Pursuant to the
       Record Date Shares             Number of Rights Exercised                     Over-Subscription Privilege
       ------------------             --------------------------                     ---------------------------
<S>                         <C>                            <C>   
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
</TABLE>
    

                                      C-2


<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 BioTime or
the facts herein set forth since the date hereof.
    

                                TABLE OF CONTENTS

   
Prospectus Summary .........................................................   3
Risk Factors ...............................................................   7
The Company ................................................................  10
The Rights Offer ...........................................................  12
Use of Proceeds ............................................................  19
Description of Securities ..................................................  20
Legal Matters ..............................................................  20
Experts ....................................................................  20
Incorporation of Certain Information by
   Reference ...............................................................  21
Additional Information .....................................................  21
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.
    

                               [Graphic Omitted]





   
                             501,654 Common Shares
                         Issuable Upon the Exercise of
                              Subscription Rights
    







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









   
                                  ______, 1999
    
                                        

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

<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   ...... $  2,736.28
       NASDAQ Listing Fee .......................................... $ 25,032.58
       Printing and Engraving Expenses   ........................... $ 10,000.00
       Accounting Fees ............................................. $ 25,000.00
       Legal Fees   ................................................ $ 25,000.00
       Subscription Agent    ....................................... $ 25,000.00
       Miscellaneous Expenses   .................................... $  2,231.14
                                                                     -----------
          Total  ....................................................$115,000.00
                                                                     ===========
    

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



Item 15. Indemnification of Directors and Officers.

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


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++
    23.1  Consent of Deloitte & Touche LLP++
    23.2  Consent of Counsel (included in opinion of counsel filed as Exhibit 5)
    


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

++ Filed herewith.

   
    

                                      II-1


<PAGE>

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

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

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

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

     The undersigned undertakes that:

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

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

                                      II-2


<PAGE>

                                   SIGNATURES

   
     Pursuant  to the requirements of the Securities Act of 1933, the Registrant
has  duly  caused  this  Amendment to the Registration Statement to be signed on
its  behalf  by  the  undersigned,  thereunto  duly  authorized,  in the City of
Berkeley, State of California on January 27, 1999.
    


                                 BIOTIME, INC.



   
                                 By:      /s/ Paul Segall
                                   ------------------------------------
                                   Paul Segall, Chief Executive Officer
    


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




<TABLE>
<CAPTION>
         Signature                             Title                           Date
         ---------                             -----                           ----
<S>                             <C>                                      <C>
   
         /s/ Paul Segall        Chief Executive Officer and Director     January 27, 1999
- ---------------------------     (Principal Executive Officer)
            PAUL SEGALL

      /s/ Ronald S. Barkin      President and Director                   January 27, 1999
- ---------------------------
        RONALD S. BARKIN

        /s/ Harold Waitz        Vice President and Director              January 27, 1999
- ---------------------------
           HAROLD WAITZ

        /s/ Hal Sternberg       Vice President and Director              January 27, 1999
- ---------------------------
          HAL STERNBERG

      /s/ Victoria Bellport     Chief Financial Officer and Director     January 27, 1999
- ---------------------------     (Principal Financial and Accounting
        VICTORIA BELLPORT       Officer)
                         
        /s/ Judith Segall       Secretary and Director                   January 27, 1999
- ---------------------------
          JUDITH SEGALL

                                Director                                 January   , 1999
- ---------------------------
        JEFFREY B. NICKEL

                                Director                                 January   , 1999
- ---------------------------
        MILTON H. DRESNER
    
</TABLE>

                                      II-3


<PAGE>

                                EXHIBIT INDEX

   
<TABLE>
<CAPTION>
Exhibit
Numbers     Description
- ---------   ----------------------------------------
<S>       <C>
4.1       Specimen of Common Share Certificate.+
4.4       Form of Subscription Certificate.++
5         Opinion of Counsel.++
23.1      Consent of Deloitte & Touche LLP.++
23.2      Consent of Counsel (included in opinion of counsel filed as Exhibit 5)
<FN>
- ------------
 + 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.

</FN>
</TABLE>
    



CONTROL NUMBER                   BIOTIME, INC.     SUBSCRIPTION CERTIFICATE FOR

   
                   SUBSCRIPTION CERTIFICATE FOR COMMON SHARES
                  VOID IF NOT EXERCISED AT OR BEFORE 5:00 P.M.
             (NEW YORK TIME) ON ______, 1999, THE EXPIRATION DATE.        RIGHTS
                 THIS SUBSCRIPTION CERTIFICATE IS TRANSFERRABLE
                         AND MAY BE COMBINED OR DIVIDED
Expiration Date               (BUT ONLY INTO SUBSCRIPTION     SUBSCRIPTION PRICE
______, 1999   CERTIFICATES EVIDENCING A WHOLE NUMBER OF RIGHTS)    U.S. $______
                    AT THE OFFICE OF THE SUBSCRIPTION AGENT            PER SHARE

                                                               CUSIP
                                                         09066L 12 1
    

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,  and upon the terms  and  conditions  and at the price for each
Common Share specified in the Prospectus dated ______, 1999.


If you  exercise  fewer than all the  Rights  represented  by this  Subscription
Certificate,  the subscription  agent will issue a new Subscription  Certificate
representing  the  balance  of  the  unexercised   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



   
- --------------------------------------------------------------------------------
                            CHIEF EXECUTIVE OFFICER
    


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

         By: ___________________________________________
             Authorized Signature


                                   EXHIBIT 4.4


       

                                        

<PAGE>
<TABLE>
<CAPTION>

                                                   Expiration Date: ______, 1999


                   PLEASE COMPLETE ALL APPLICABLE INFORMATION
<S>                                       <C>                                        <C>

     By Mail:                                 By Hand:                                   By Overnight Courier:      
 To: America Stock                        To: America 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. Subscription                    divided by 20 =              .000 x $                   = $
                    ------------------                 ------------------  --------------------  ----------------
                    (Rights Exercised)                 (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 certain shareholders only, as described in the
           Prospectus.
    

[ ] C. Sell any remaining unexercised Rights

[ ] D. Sell all of my Rights.

_______________________________________ Please provide your telephone number    Day (___)___________________________
Signature of Subscriber(s)/Seller(s)                                        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:
</TABLE>


       



                                                                       Exhibit 5


                                  LAW OFFICES

              LIPPENBERGER, THOMPSON, WELCH, SOROKO & GILBERT LLP
                             250 MONTGOMERY STREET
                                   SUITE 500
                          SAN FRANCISCO, CA 94104-3401
                                 (415) 421-5300
                                                                      FACSIMILE
                                                                  (415) 421-0225



                                January 26, 1999


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


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


Ladies/Gentlemen:

   
     We  are  counsel  to  BioTime,  Inc. (the "Company") in connection with the
offer  and sale of up to 751,654 Common Shares (the "Shares"), including 501,654
Shares  issuable  upon  the  exercise of subscription rights (the "Rights") that
will  be  issued  and distributed by the Company to the holders of record of its
Common  Shares,  plus  up  to an additional 250,000 Shares that may be issued to
fill  over-subscriptions  of  those Rights. The Company will issue one Right for
each  Common  Share  that was outstanding on January 5, 1999, which has been set
as  the record date for determining shareholders entitled to receive the Rights.
The  issuance  of  the  Rights  and  the  offer  and sale of the Shares is being
registered  under  the  Securities  Act  of  1933,  as  amended,  pursuant  to a
Registration Statement on Form S-3, File No. 333-69179.
    

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

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

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


                             Very truly yours,


                             Lippenberger, Thompson, Welch, Soroko & Gilbert LLP



                                                                   Exhibit 23.1



                         INDEPENDENT AUDITORS' CONSENT


     We  consent  to  the  incorporation by reference in this Amendment No. 1 to
Registration  Statement No. 333-69179 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  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
January 27, 1999



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