Germ cells {gamete}| are haploid sperm or eggs.
Male and female gamete union {syngamy}| makes one somatic cell.
Corona radiata cells cover eggs, and hyaluronic acid holds them together. Many sperm attack corona radiata with enzymes, until one sperm breaks through {fertilization, process}|. Fertilizing sperm causes fertilization membrane formation, to block other sperm. Fertilized egg begins to divide. Eggs implant in uterus walls five to ten days after fertilization.
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Date Modified: 2022.0225