1. 1Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, Texas.
2. 2Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas.
3. 3Department of Medicine, University of Florida, Gainesville, Florida.
4. 4Department of Anatomy and Cell Biology, University of Florida, Gainesville, Florida.
5. 5Department of Infectious Diseases and Immunology, University of Florida, Gainesville, Florida.