1. Department
of Chemistry, Department of Molecular and
Experimental Medicine, and The Skaggs Institute
for Chemical Biology, The Scripps Research Institute, 10550 North
Torrey Pines Road, La Jolla, California 92037, United States
2. Department of Cellular and
Molecular Pharmacology, University of California, San Francisco, California 94158, United States
3. Department of Microbiology and Immunology, University of California, San Francisco, California 94143, United States
4. Department
of Biochemistry, University of Washington, Seattle, Washington 98195, United States