1. Department of Pharmacology, Emory University School of Medicine and Emory Chemical Biology Discovery Center, Atlanta, Georgia
2. Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York
3. Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota
4. Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York,