1. Department of Neurological Surgery and The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143
2. Department of Biology, The University of Iowa, Iowa City, IA 52242
3. Department of Physiology, University of California, San Francisco, San Francisco, CA 94143
4. Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, San Francisco, CA 94143
5. Kavli Institute for Fundamental Neuroscience, University of California, San Francisco, San Francisco, CA 94143