1. Department of Structural Biology, University of Pittsburgh School of Medicine, 3501 Fifth Avenue, Pittsburgh, Pennsylvania 15260, United States
2. Center for Drug Design, College of Pharmacy, University of Minnesota, 516 Delaware Street SE, PWB 7-215,
MMC 204, Minneapolis, Minnesota 55455, United States
3. Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322, United States
4. Department of Natural Science, Chatham University, Woodland Road, Pittsburgh, Pennsylvania 15232, United States