1. Center for Cell Engineering, Memorial Sloan-Kettering Cancer Center (MSKCC), New York, NY 10065, USA.
2. Tri-Institutional MSTP Program (MSKCC, Rockefeller University, Weill-Cornell Medical College), New York, NY 10065, USA.
3. Molecular Pharmacology and Chemistry Program, MSKCC, New York, NY 10065, USA.