EXHIBIT 4.2 STOCK OPTION AGREEMENT (NON-STATUTORY STOCK OPTION) This STOCK OPTION AGREEMENT (this "OPTION AGREEMENT") is made and entered into as of the 15th day of October, 2001, by and between BIOSOURCE INTERNATIONAL, INC. (the "COMPANY"), and...Stock Option Agreement • March 29th, 2002 • Biosource International Inc • In vitro & in vivo diagnostic substances • California
