1. Integrated Program in Cellular, Molecular and Biophysical Studies, Columbia University, New York, New York, USA
2. Medical Scientist Training Program, Columbia University College of Physicians and Surgeons, New York, New York, USA
3. Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, USA
4. Department of Microbiology and Immunology, Columbia University, New York, New York, USA
5. Howard Hughes Medical Institute, Columbia University, New York, New York, USA