1. Health & Environmental Sciences, Dow Corning Corporation, Midland, Michigan 48686
2. Covance Laboratories Inc., Vienna, Virginia 22182
3. Pathco Inc., Frederick, Maryland 21702
4. Laboratory of Experimental Pathology, National Institute of Environmental Health, Research Triangle Park, North Carolina 27709
5. Center for Veterinary Medicine, Food and Drug Administration, Rockville, Maryland 20855
6. Estuary Pharmaceuticals, Cambridge, Massachusetts 02139
7. Pfizer Inc., Kalamazoo, Michigan 49001
8. Chesterfield, Missouri 63005