1. Department of Molecular and Cell Biology; University of California; Berkeley California
2. Howard Hughes Medical Institute, University of California; Berkeley Berkeley, California
3. Department of Cellular and Molecular Pharmacology; University of California; San Francisco California
4. Howard Hughes Medical Institute, University of California; San Francisco California
5. Department of Chemistry; University of California; Berkeley California
6. Innovative Genomics Initiative, University of California; Berkeley Berkeley, California
7. Lawrence Berkeley National Laboratory; Physical Biosciences Division; Berkeley California