[1] Nippon Med Sch, Dept Biochem & Mol Biol, Tokyo, Japan
[2] Univ Tsukuba, Grad Sch Comprephens Human Sci, Majors Med Sci, Tsukuba, Ibaraki, Japan
[3] Natl Ctr Child Hlth & Dev, Dept Human Genet, Tokyo, Japan
[4] Takara Bio Inc, CDM Ctr, Shiga, Japan
[5] Univ Tsukuba, Fac Med, Dept Neurol, Tsukuba, Ibaraki, Japan