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Penetration of the zona pellucida
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Penetration of the zona pellucida

The zona pellucida (ZP) is the outermost layer of egg cells. In other words, it is the first membrane sperm have to cross in order to join the egg cell and fertilize it.

Read the full article on: ( 84).
By BSc, MSc (embryologist) and BA, MA (fertility counselor).
Last Update: 11/29/2018
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