1. Department of Biological Sciences, Columbia University, New York City, New York 10027, United States
2. Department of Physiology and Cellular Biophysics, Columbia University Medical Center, New York City, New York 10032, United States
3. Department of Systems Biology, Columbia University Medical Center, New York City, New York 10032, United States
4. Department of Chemistry, Columbia University, New York City, New York 10027, United States