1. Product Safety Center, Monsanto Company, 800 North Lindbergh Boulevard, St. Louis, Missouri 63167; Corn States Hybrid Service, 2505 McKinley Avenue, Des Moines, Iowa 50321; Monsanto Company, 1677 80th Street, Monmouth, Illinois 61462; Monsanto Company, 9468 Indian Hills Drive, Clive, Iowa 50325; National Veterinary Services Laboratory, U.S. Department of Agriculture, P.O. Box 844, 1800 Dayton Avenue, Ames, Iowa 50010; and Romer Labs, Inc., 1301 Stylemaster Drive, Union, Missouri 63084