1. Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908, United States
2. Center for Structural Genomics of Infectious Diseases (CSGID), University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia 22908, United States
3. Department of Chemistry and Biochemistry, San Francisco State University, San Francisco, California 94132, United States
4. Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States