D015044Level 6

Zona Pellucida

**Definition:** A tough transparent membrane surrounding the OVUM. It is penetrated by the sperm during FERTILIZATION.

**Tree numbers:** - A05.360.490.690.950 - A11.284.295.310.990 - A11.497.497.900 - A16.690.900

GET/api/v1/systems/mesh/nodes/D015044

Official DownloadPublic Domain (US Government)Source

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