Affiliation: | 1. Department of Molecular, Cellular and Developmental Biology, and Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University, Box 208103, New Haven, CT 06520, USA;2. Department of Chemistry, The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA |