Large Scale Biology (LSBC) 10-Q 2004 Q2 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

August 16, 2004

In connection with the Large Scale Biology Corporation Quarterly Report on Form 10-Q for the quarter ended June 30, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Kevin J. Ryan, certify, pursuant to Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

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

(2) that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Large Scale Biology Corporation for the fiscal period covered by the Report.

By:	/s/ Kevin J. Ryan
	Kevin J. Ryan
	President and Chief Executive Officer
	Large Scale Biology Corporation