1. California Regional Primate Research Center
2. Center for Comparative Medicine
3. McGill University AIDS Centre, Lady Davis Institute-Jewish General Hospital, Montreal, Quebec, Canada H3T 1E2
4. Emory University, VA Medical Center, Decatur, Georgia 30033
5. Department of Veterinary Medicine & Epidemiology
6. Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, California 95616