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act of becoming pregnant; fertilization of an ovum by a spermatozoon conception
membrane that forms around a fertilized ovum and prevents penetration by additional spermatozoon fertilization membrane
cell resulting from the union of an ovum and a spermatozoon (including the organism that develops from that cell) fertilized ovum , zygote
spermatozoon or an ovum germ cell , reproductive cell , sex cell
immature gamete produced by a spermatocyte; develops into a spermatozoon spermatid
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