1. Department of Cellular and Molecular Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0651, USA.
2. Laboratory of Genetics, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037-1002, USA.
3. Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0651, USA.
4. Department of Neuroscience, section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands.
5. Department of Neurosurgery, University of California, San Diego–Rady Children’s Hospital, San Diego, CA 92123, USA.
6. Neuroimmunology, Biogen, 225 Binney Street, Cambridge, MA 02142, USA.
7. Department of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0651, USA.