1. From the Departments of Psychology (E.R.G., S.L.K.B., N.Z., A.C.D.), Neuroscience (G.N.N., K.K., S.L.K.B., P.G.P., A.C.D.), and Molecular Virology, Immunology and Medical Genetics (P.G.P.), Institute of Behavioral Medicine Research (S.L.K.B., P.G.P., A.C.D.), and the Center for Brain and Spinal Cord Repair (P.G.P., A.C.D.), The Ohio State University, Columbus, Ohio.