1. Department of Ophthalmology, University of California, San Francisco, San Francisco, CA 94143, USA.
2. Neuroscience Program, University of California, San Francisco, San Francisco, CA 94143, USA.
3. Department of Pediatrics, University of California, Davis, Sacramento, CA 95817, USA.
4. Department of Psychiatry and Institute for Human Genetics, University of California, San Francisco, San Francisco, CA 94143, USA.
5. Department of Pediatrics, Eli and Edythe Broad Institute for Regenerative Medicine and Stem Cell Research, and Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143, USA.
6. Department of Physiology, University of California, San Francisco, San Francisco, CA 94143, USA.