International Stem Cell (ISCO) 10-Q 2009 Q1 Quarterly report

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q (the "Report") of International Stem Cell Corporation (the "Company") for the three months ended March 31, 2009, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Kenneth C. Aldrich, Chief Executive Officer of the Company, hereby certify pursuant to 18 U.S.C. Section 1350,that  as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002:

(1) the Report fully complies with the  requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 15, 2009

By:	/s/ Kenneth C. Aldrich
	Kenneth C. Aldrich
	Chief Executive Officer