[1] Mem Sloan Kettering Canc Ctr, Cell Biol Program, New York, NY 10021 USA
[2] Mem Sloan Kettering Canc Ctr, Mol Pharmacol & Therapeut Program, New York, NY 10021 USA
[3] NCI, Frederick Canc Res & Dev Ctr, Div Basic Sci, Basic Res Lab, Frederick, MD 21702 USA
[4] NCI, Frederick Canc Res & Dev Ctr, Div Basic Sci, Immunobiol Lab, Frederick, MD 21702 USA