1. From the Department of Neurology (J.B., N.H., M.F.), University of Massachusetts Medical School, Worcester, Mass; the Department of Neurology (Q.S., T.Q.D.), Yerkes National Primate Research Center, Emory University, Atlanta, Ga; the Department of Neurology (J.B.), University of Heidelberg, Germany; and the Department of Neurology (S.S.), University of Erlangen, Germany.