1. Department of Neurology, University of California, 1450 Third Street, MC0520, San Francisco, CA 94158–9001, USA.
2. Department of Pediatrics, University of California, San Francisco, CA 94158–9001, USA.
3. Neurological Surgery and Brain Tumor Research Center, University of California, San Francisco, CA 94158–9001, USA.
4. Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA 94158–9001, USA.
5. Program in Chemistry and Chemical Biology, University of California, San Francisco, CA 94158–9001, USA.
6. Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94158–9001, USA.
7. Department of Pathology, University of California, San Francisco, CA 94158–9001, USA.
8. Howard Hughes Medical Institute, University of California, San Francisco, CA 94158–9001, USA.