1. Laboratory of Comparative Medical Genetics; College of Veterinary Medicine; Michigan State University; East Lansing MI
2. Department of Microbiology & Molecular Genetics; College of Veterinary Medicine; Michigan State University; East Lansing MI
3. Veterinary Specialist Services; Underwood QLD 4119 Australia
4. Section of Medical Genetics; School of Veterinary Medicine; University of Pennsylvania; Philadelphia PA