[1] Hirosaki Univ, Sch Med, Dept Pediat, Hirosaki, Aomori 036, Japan
[2] Univ Tsukuba, JST,ERATO, Ctr Tsukuba Adv Res Alliance, TARA Ctr, Tsukuba, Ibaraki, Japan
[3] Hirosaki Univ, Sch Med, Dept Pathol, Hirosaki, Aomori 036, Japan
[4] Hirosaki Univ, Sch Med, Dept Anat, Hirosaki, Aomori 036, Japan
[5] Hirosaki Univ, Sch Med, Dept Biomed Chem, Hirosaki, Aomori 036, Japan
[6] Jichi Med Sch, Dept Hematol, Tochigi, Japan