1. Department of Animal Science and Center for Integrated Animal Genomics, Iowa State University, Ames, IA 50011–3150, USA.
2. Department of Pathobiology, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37996, USA.
3. Department of Pathology, St. Louis University, St. Louis, MO 63104, USA.
4. Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104–6010, USA.
5. Los Angeles Biomedical Research Institute at Harbor–UCLA Medical Center, and the Department of Pediatrics at Harbor-UCLA Medical Center, Torrance, CA 90502, USA.
6. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011–1250, USA.
7. Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA 50011–1250, USA.