1. Foodborne Toxin Detection and Prevention, Western Regional Research Center, Agricultural Research Service, U. S. Department of Agriculture, 800 Buchanan Street, Albany, California 94710, United States
2. Department of Environmental Toxicology, One Shields Avenue, University of California, Davis, California 95616, United States
3. Wonderful Orchards, 6801 E. Lerdo Highway, Shafter, California 93263, United States