1. Department of Chemistry, University of Madison−Wisconsin, 1101 University
Ave., Madison, Wisconsin 53706, United States
2. Department of Microbiology and
Immunology, Emory University School of Medicine, 3001 Rollins Research Center, Atlanta, Georgia 30322, United States
3. Research Service, Veterans Affairs Medical Center, 1670 Clairmont Rd.,
Decatur, Georgia 30033, United States