EXTENSION OF EMPLOYMENT AGREEMENT DATE: August 28, 2001 Parties: Techne Corporation 614 McKinley Place N.E. Minneapolis, MN 55413 Marcel Veronneau AGREEMENTS: The parties hereby agree that the termination date of the Employment Agreement between them for the period July 1, 1995 through June 30, 1998 and previously extended to June 30, 2001 is extended to June 30, 2004. All other provisions of such Employment Agreement shall remain in full force and effect. Techne Corporation By /s/ Thomas E. Oland Thomas E. Oland, President /s/ Marcel Veronneau Marcel Veronneau