1. Division of Infectious Diseases, University of Colorado School of Medicine, Aurora, Colorado, USA
2. Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA
3. Laboratory of Chemical Biology and Microbial Pathogenesis, The Rockefeller University, New York, New York, USA
4. Departments of Immunology & Microbiology and Chemistry, Scripps Research, La Jolla, California, USA