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Extracellular spaceSecretedZona pellucidaExtracellular matrix


Zona pellucida is a specialized extracellular matrix that surrounds the plasma membrane of mammalian oocytes. It is required for successful fertilization. Zona pellucida allows species-specific fertilization, prevents polyspermy, and enables acrosomal reaction for the successful adhesion and penetration of the sperm cell.


Egg coat
Pellucid zone
Vitelline membrane


› Cellular component


Extracellular matrix
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