1. Center for Drug Discovery, University of North Carolina, Greensboro, North Carolina 27402, United States
2. Department of Anatomy and Cell Biology and Center for Substance Abuse Research, Temple University, Philadelphia, Pennsylvania 19140, United States
3. Conrad Prebys Center for Chemical Genomics at Sanford-Burnham Medical Research Institute, La Jolla, California 92037, United States
4. Center for Organic and Medicinal Chemistry, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
5. Department of Cell Biology, Duke University, Durham, North Carolina 27708, United States