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Zona pellucida

Very high power SEM of the zona pellucida of a stage 3 embryo in vitro (original magnification x10,000 ).

Notice the sperm attached to the zona pellucida of the expanded blastocyst.

From: Ménézo et al., 1999. Reproduced with permission of the publisher, Cambridge University Press.

Keywords: blastocyst(s), sperm, zona pellucida

Source: The Virtual Human Embryo.