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This diagram presents transformation of sperm morphology in terms of gamete fertility. After passing the cumulus cell layer, the acrosome-reacted sperm is capable of penetrating the zona pellucida and entering the perivitelline space. The equatorial segment of the acrosome-reacted sperm interacts with oocyte membrane and fusion begins. Finally, the sperm nucleus is released into the oocyte cytoplasm to accomplish fertilization.
