1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095-1569
2. Department of Biological Chemistry, University of California, Los Angeles–Department of Energy Institute, University of California, Los Angeles, Los Angeles, CA 90095-1737
3. Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095-1570
4. HHMI, University of California, Los Angeles, Los Angeles, CA 90095-1570
5. Department of Pharmacology and Pharmaceutical Sciences, University of Southern California, Los Angeles, CA 90089-9121