1. Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
2. Department of Biochemistry, University of Washington, Seattle, Washington, USA
3. Department of Biological Structure, University of Washington, Seattle, Washington, USA
4. Department of Microbiology and Immunology and the Center for Predictive Medicine for Biodefense and Emerging Infectious Diseases, University of Louisville School of Medicine, Louisville, Kentucky, USA
5. Department of Microbiology, University of Washington, Seattle, Washington, USA
6. Department of Microbiology and Immunology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
7. Department of Genetics, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA