Common Contracts

2 similar Lock-Up Letter contracts by Advanced Cell Technology, Inc.

Re: Lock-up Letter
Lock-Up Letter • September 7th, 2007 • Advanced Cell Technology, Inc. • Pharmaceutical preparations • New York

Reference is made to the Securities Purchase Agreement, dated August 31, 2007 (the “Purchase Agreement”), among Advanced Cell Technology, Inc. (the “Company”) and the purchasers signatory thereto (the “Purchasers”). Capitalized terms used herein but not otherwise defined shall have the meaning ascribed to them in the Purchase Agreement.

To the Purchasers as Defined in the Purchase Agreement
Lock-Up Letter • September 19th, 2005 • Advanced Cell Technology, Inc. • Pharmaceutical preparations • New York

Reference is made to the Securities Purchase Agreement, dated September 15, 2005 (the “Purchase Agreement”), among Advanced Cell Technology, Inc. (the “Company”) and the purchasers signatory thereto (the “Purchasers”). Capitalized terms used herein but not otherwise defined shall have the meaning ascribed to them in the Purchase Agreement.