1Department of Physics, University of California, Berkeley, CA 94720, USA
2Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
3Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720, USA
4Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
6Vision Science Program, University of California, Berkeley, CA 94720, USA
