1. Center for Integrated Chemical Biology and Drug Discovery, Division of Medicinal Chemistry and Natural Products, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
2. Structural Genomics Consortium, University of Toronto, Toronto, Ontario, M5G 1L6, Canada
3. NIH Chemical Genomics Center, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland 20892