1. From the Department of Neurology (S.I.S.), University of Texas, Houston, TX; the Department of Neurology (M.C.), Henry Ford Hospital, Detroit, MI; Athersys Inc (R.D.), Cleveland, OH; the Department of Neurology (S.T.C.), David Geffen UCLA Medical School, Los Angeles, CA; Scripps Research Institute (D.P.), Jupiter, FL; and the Department of Neurology (L.W.), University of Pittsburgh, Pittsburgh, PA.