1. Poisonous Plant Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 1150 East 1400 North, Logan, Utah 84341
2. Indiana Animal Disease Diagnostic Laboratory, Purdue University, 406 South University, West Lafayette, Indiana 47907
3. Veterinary Medical Diagnostic Laboratory, University of Missouri—Columbia, 1600 East Rollins Street, Columbia, Missouri 65211