1. Biophysics
Graduate Group, University of California, Berkeley, Berkeley, California 94720, United States
2. Department
of Chemistry, University of California, Davis, Davis, California 95616, United States
3. The
Joint Center for Structural Genomics, The Scripps Research Institute, La
Jolla, California 92037, United States
4. Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
5. Department
of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, United States