[1] Tokyo Med & Dent Univ, Dept Neurol & Neurol Sci, Bunkyo Ku, Tokyo, Japan
[2] Tsukuba Primate Res Ctr, Natl Inst Biomed Innovat, Lab Dis Control, Tsukuba, Ibaraki, Japan
[3] Nippon Med Sch, Dept Biochem & Mol Biol, Bunkyo Ku, Tokyo 113, Japan
[4] Jichi Med Univ, Div Genet Therapeut, Ctr Mol Med, Shimotsuke, Tochigi, Japan