1. From the Departments of Neurosurgery and Neurobiology and the Yale Program on Neurogenetics (L.C., G.T., A.L., M.G.), Yale University School of Medicine, New Haven, Conn; the Department of Histology and Embryology (G.T.), Akdeniz University, Antalya, Turkey; and the Department of Neurosurgery (H.Y., R.F.), Brigham and Women’s Hospital, Boston, Mass.