1. From the Departamento de Neurociencias, Achucarro Basque Center for Neuroscience, and CIBERNED, Universidad del País Vasco (UPV/EHU), E-48940 Leioa, Vizcaya, Spain (C.M., M.D., A.P.-S); and University of Washington School of Medicine, Department of Neurology, Seattle, WA (B.R.R.).