1. Department of Neurobiology, Stanford University, Stanford, CA 94305, USA.
2. Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
3. Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
4. Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA.
5. Department of Biology, Stanford University, Stanford, CA 94305, USA.
6. Department of Pathology, Stanford University, Stanford, CA 94305, USA.
7. Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA 94305, USA.
8. Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.