1. Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510, Department of Biochemistry, New York University Medical Center, New York, New York 10016, Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, Texas 77555, and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven,...