1. Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA
2. School of Molecular Biosciences, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA
3. Protein Biotechnology Graduate Training Program, Washington State University, Pullman, WA 99164, USA
4. Animal Disease Research Unit, Agricultural Research Service, United States Department of Agriculture, Pullman, WA 99164, USA