1. Department of Biochemistry and Biophysics, Texas A&M University, 300 Olsen Blvd, College Station, Texas 77843, United States
2. Department of Chemistry, Texas A&M University, 580 Ross Street, College Station, Texas 77843, United States
3. Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Dr, La Jolla, California 92093, United States
4. Department of Microbiology and Immunology, University of Texas Medical Branch, 301 University Blvd, Galveston, Texas 77555, United States