Stanford University - Department of Neurology and Neurological Sciences, Stanford University - Department of Neurology and Neurological Sciences, Stanford University - Baxter Laboratory in Stem Cell Biology, Stanford University - Department of Neurology and Neurological Sciences, Stanford University - Department of Neurology and Neurological Sciences, Institute of Cancer Research (ICR) - Division of Molecular Pathology, Institute of Cancer Research (ICR) - Division of Molecular Pathology, Stanford University - Department of Neurology and Neurological Sciences, Stanford University - Baxter Laboratory in Stem Cell Biology and University of California, Berkeley - Howard Hughes Medical Institute (HHMI)