1. Department of Neurology, University of California, San Francisco, San Francisco, California, USA
2. Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, California, USA
3. Integrative Program in Quantitative Biology, Bioinformatics, University of California, San Francisco, San Francisco, California, USA
4. Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado, USA
5. Department of Microbiology, Boston University School of Medicine, Boston, Massachusetts, USA
6. National Emerging Infectious Diseases Laboratories, Boston University, Boston, Massachusetts, USA
7. Rocky Mountain Veterinary Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA
8. Howard Hughes Medical Institute, Chevy Chase, Maryland, USA