1. Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
2. Molecular and Translational Science Division, U.S. Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States
3. Biotechnology Program, Hagerstown Community College, Hagerstown, Maryland 21742, United States
4. Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309, United States
5. Bacteriology Division, U.S. Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702, United States