1. BioReliance Corporation, Rockville, Maryland, 20850
2. Huntingdon Life Sciences, East Millstone, New Jersey 08875
3. Pfizer Inc, Groton, Connecticut 06340
4. Experimental Pathology Laboratory NorthEast, Galena, Maryland 21635
5. Chemical Industry Institute of Toxicology, Research Triangle Park, North Carolina 27709
6. Regan Path/Tox Services, Ashland, Ohio 44805
7. Covance Laboratories Inc, Vienna, Virginia 22182