EXTENSION OF EMPLOYMENT AGREEMENT DATE: March 31, 1999 PARTIES: Techne Corporation, a Minnesota corporation 614 McKinley Place N.E. Minneapolis, Minnesota 55413 Marcel Verronneau AGREEMENTS: The parties hereby agree that the termination date of the Employment Agreement between them dated March 8, 1996 originally for the period July 1, 1995 through June 30, 1998 is extended to June 30, 2001. All other provision of such Employment Agreement shall remain in full force and effect. TECHNE CORPORATION By /s/ Thomas E. Oland ------------------------------- Thomas E. Oland, President "Company" /s/ Marcel Veronneau ------------------------------ Marcel Verronneau "Employee"