1. Biophysics Graduate Group, University of California, Berkeley, CA 94720, USA.
2. Molecular Biophysics and Integrative Bio-Imaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. California Institute for Quantitative Biology (QB3), University of California, Berkeley, CA 94720, USA.
4. Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
5. Institute for Systems Biology, Seattle, WA 98109, USA.
6. Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA.
7. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA.
8. Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.