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Effects of cumulus cells on sperm penetration of bovine oocytes in protein-free mediumK. Saeki; Y. Nagao; M. Hoshi; H. Kainuma · 1994
In vitro fertilization of bovine oocytes in a protein-free medium and subsequent development to the blastocyst stageK. Saeki; Y. Nagao; M. Hoshi; H. Kainuma · 1993
Effect of oxygen concentration on the development of in vitro matured and fertilized bovine oocytes cultured in a protein - free mediumY. Nagao; K. Saeki; M. Hoshi; H. Kainuma · 1993