1. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
2. California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, CA 94720, USA.
3. Department of Theoretical Biophysics, Max Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany.
4. Graduate Group in Biophysics, University of California, Berkeley, Berkeley, CA 94720, USA.
5. Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
6. Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA.
7. Institute of Biophysics, Goethe University, Frankfurt/M, Germany.
8. Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.