Zona Pellucida
A tough transparent membrane surrounding the OVUM. It is penetrated by the sperm during FERTILIZATION.
Year introduced: 1991(1975)
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Subheadings:
Tree Number(s): A05.360.490.690.950, A11.284.295.310.990, A11.497.497.900, A16.690.900
MeSH Unique ID: D015044