1. From the Department of Neurology (K.N., M.I., R.T., H.T.), Horizontal Medical Research Organization (M.I.), the Department of Molecular Oncology (M.N.), and The 21st Century Center of Excellence Program, Department of Oncology (C.T.), Kyoto University Graduate School of Medicine, Kyoto, Japan; and the Laboratory for Behavioral Genetics (S.I.), RIKEN Brain Science Institute, Wako, Japan.