1. Department of Physiology and Biophysics, University of California, Irvine, CA 92697-4561, USA.
2. Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, CA 92697, USA.
3. Howard Hughes Medical Institute, Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA.
4. Vertex Pharmaceuticals, 3215 Merryfield Row, San Diego, CA 92121, USA.
5. Department of Neurobiology and Behavior, University of California, Irvine, CA 92697, USA.
6. Department of Biomedical Engineering, University of California, Irvine, CA 92697, USA.
7. Center for Complex Systems Biology, University of California, Irvine, CA 92697, USA.
8. Institute for Immunology, University of California, Irvine, CA 92697, USA.