1. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States, Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76706, United States, Department of Biological Chemistry and Molecular Pharmacology and Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, United States, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024, United States, Department of Chemistry...