1. Department
of Chemistry, University of California, Berkeley, California 94720, United States
2. California
Institute for Quantitative Biosciences (QB3), University of California, Berkeley, California 94720, United States
3. Department
of Bioengineering and Therapeutic Science, University of California, San Francisco, San Francisco, California 94158, United States
4. Department
of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States