1. Produce Quality and Safety Laboratory
2. Food Technology and Safety Laboratory, Henry A. Wallace Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Bldg. 002, 10300 Baltimore Avenue, Beltsville, Maryland 20705-2350
3. Division of Virulence Assessment, Food and Drug Administration, Laurel, Maryland 20708
4. National Center for Biotechnology Information, Bldg. 38A, National Institutes of Health, Bethesda, Maryland 20894