Removal of sperm tail using trypsin and pre-activation of oocyte facilitates intracytoplasmic sperm injection in mice and rats oleh Kohei TORIKAI, Kazuma SHIMIZU, Hiroaki NAGATOMO, Mariko KASAI, Megumi KATO-ITOH, Yuko KAMADA, Ikue SHIBASAKI, Hyojung JEON, Riko KIKUCHI, Sayaka WAKAYAMA, Fabian SUCHY, Hiromitsu NAKAUCHI, Teruhiko WAKAYAMA, Eiji MIZUTANI