1. Department of Microbiology and Immunology, University of Texas, Medical Branch, 3000 University Boulevard, Galveston, Texas 77755-1001, United States
2. Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States
3. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 16610 Prague, Czech Republic
4. Department of Medicine, Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, California 92037, United States