Affiliation: | (1) Laboratory of Histology and Cytology, Graduate School of Medicine, Hokkaido University, Kita 15-Nishi 7, Sapporo 060-8638, Japan;(2) Meiji Dairies Research Chair, Creative Research Initiative “Sousei”(CRIS), Hokkaido University, Kita 21-Nishi 10, Sapporo 001-0025, Japan |