1. Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York, USA
2. Gerstner Sloan Kettering Graduate School of Biomedical Sciences, New York, New York, USA
3. Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York, USA
4. Institute of Organic Chemistry, University of Freiburg, Freiburg, Germany
5. Department of Microbiology and Immunology, Weill Cornell Medical College, New York, New York, USA