[1] Kyorin Univ, Dept Hlth Sci, Lab Anat & Cell Biol, 5-4-1 Shimorenjaku, Mitaka, Tokyo 1818612, Japan
[2] Meiji Univ, Inst Reprod & Endocrinol, Tama Ku, 1-1-1 Higashimita, Kawasaki, Kanagawa 2148571, Japan
[3] Jichi Med Univ, Sch Med, Dept Anat, Div Histol & Cell Biol, 3311-1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan
[4] Teikyo Univ, Grad Sch Med, Dept Anat, Itabashi Ku, 2-11-1 Kaga, Tokyo 1738605, Japan
[5] Kyorin Univ, Dept Hlth Sci, Lab Immunol, 5-4-1 Shimorenjaku, Mitaka, Tokyo 1818612, Japan
[6] Toho Univ, Fac Sci, Dept Biomol Sci, 2-2-1 Miyama, Funabashi, Chiba 2748510, Japan
[7] Meiji Univ, Sch Agr, Dept Life Sci, Tama Ku, 1-1-1 Higashi Mita, Kawasaki, Kanagawa 2148571, Japan