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Reproductive system / Fertility / Female reproductive system / Developmental biology / Pronucleus / Spermatozoon / Zona pellucida / Immature ovum / Oocyte / Biology / Germ cells / Reproduction


STAGE 1 Approximatelymm in diameter Approximately 1 postovulatory day Characteristic feature: unicellularity Embryonic life commences with fertilization, and
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Document Date: 2012-05-08 14:02:32


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