Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
TEW WILLIAM P PHD
  2. Issuer Name and Ticker or Trading Symbol
BIOTIME INC [BTX]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Commercial Officer
(Last)
(First)
(Middle)
1301 HARBOR BAY PARKWAY
3. Date of Earliest Transaction (Month/Day/Year)
02/20/2013
(Street)

ALAMEDA, CA 94502
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Shares, no par value               47,125 (1) D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Shares $ 4.22 02/20/2013   J   100,000     (2) 02/19/2020 Common Shares 100,000 $ 0 100,000 D  
Option to Purchase Common Shares $ 4.17               (3) 10/02/2018 Common Shares 3,850   3,850 D  
Option to Purchase Common Shares $ 7.47               (4) 03/20/2018 Common Shares 25,000   25,000 D  
Warrant to Purchase Common Shares $ 10             03/21/2011 05/02/2014 Common Shares 29,247   29,247 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
TEW WILLIAM P PHD
1301 HARBOR BAY PARKWAY
ALAMEDA, CA 94502
      Chief Commercial Officer  

Signatures

 /s/ William P. Tew   02/22/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Does not include shares that may be acquired upon the exercise of certain stock options, and shares that may be acquired upon the exercise of certain warrants.
(2) 1/48th of the number of options will vest and become exercisable at the end of each full month of employment after January 1, 2013.
(3) 1/48th of the number of options will vest and become exercisable at the end of each full month of employment after October 4, 2011.
(4) 1/48th of the number of options will vest and become exercisable at the end of each full month of employment after March 21, 2011.

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