1. Campus Animal Resources, Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA fclaire@ora.msu.edu
2. University Laboratory Animal Resources, Department of Pathobiology, School of Veterinary Medicine; University of Pennsylvania, Philadelphia, Pennsylvania, USA
3. Toxicity Assessment Division, Neurotoxicology Branch, United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA
4. Comparative Medicine, Pfizer, La Jolla, California, USA