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Masaru Okabe 2015, 'Mechanisms of fertilization elucidated by gene-manipulated animals', Asian Journal of Andrologyhttp://www.ajandrology.com/article.asp?issn=1008-682X;year=2015;volume=17;issue=4;spage=646;epage=652;aulast=Okabe. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)