1. Departments of Anatomy and Neurobiology (E.B., S.C.C.) and Neurology (S.C.C.), University of California, Irvine; Department of Neurology, University of California, Los Angeles (B.H.D.); Department of Neurology, University of Texas, Houston (E.A.N.); and Neurosciences Therapy Area Unit, GlaxoSmithKline, Research Triangle Park, NC (L.A.E.).