[1] Jichi Med Sch, Dept Pediat, Minami Kawachi, Tochigi 32904, Japan
[2] Tokyo Inst Psychiat, Dept Ultrastruct & Histochem, Tokyo, Japan
[3] Natl Ctr Neurol & Psychiat, Dept Lab Med, Kodaira, Tokyo, Japan
[4] Natl Ctr Neurol & Psychiat, Dept Ultrastruct Res, Kodaira, Tokyo, Japan