1. From the Neurological Institute (J.P.M., S.K.H., T.K.T., I.M.), New York, NY; the University of Iowa (J.B., W.T.C.Y., E.T., H.N., H.P.A., K.G.), Iowa City; KAI (S.H.), Rockville, Md; and the National Institute of Neurological Disorders and Stroke (J.R.M.), Bethesda, Md.