1. From the Department of Neurology (C.E.M., A.V., E.W., S.S.Z.), Weill Institute for Neurosciences, University of California, San Francisco; Department of Molecular Microbiology and Immunology (T.G.F.), University of Texas at San Antonio; Department of Neurology and Neurological Science (L.S.), Stanford University; and Program in Immunology (S.S.Z.), University of California, San Francisco, CA.