1. Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
2. Department of Pharmacology, Weill Cornell Medical College, 1300 York Avenue, New York, New York 10065, United States
3. University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
4. Small Animal Imaging Core Facility, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, New York 10065, United States
5. Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Ave, New York, New York 10065, United States