1. Department of Biological Sciences, Howard Hughes Medical Institute, Columbia University Medical Center, Columbia University, New York, New York, USA
2. Department of Biochemistry and Molecular Biophysics, Howard Hughes Medical Institute, Columbia University Medical Center, Columbia University, New York, New York, USA
3. Department of Microbiology and Immunology, Howard Hughes Medical Institute, Columbia University Medical Center, Columbia University, New York, New York, USA
4. Department of Medicine, Howard Hughes Medical Institute, Columbia University Medical Center, Columbia University, New York, New York, USA