1. US Department of Agriculture, Animal and Plant Health Inspection Service, Science & Technology, National Veterinary Services Laboratories, Ames, IA 50010
2. Iowa State University, School of Veterinary Medicine, Veterinary Diagnostic Laboratory, Ames, IA 50010
3. US Department of Agriculture, Agriculture Research Service, Northern Regional Research Center, Bioactive Constituents Research, Peoria, IL 61604
4. University of Arizona, Department of Veterinary Science, Arizona Veterinary Diagnostic Laboratory, Tucson, AZ 85721
5. PO Box 212, Sonoita, AZ 85637