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Human egg with coronal cells

Colour-enhanced scanning electron micrograph of a human egg by Yorgos Nikas


The egg is surrounded by a glycoprotein coat called the zona pellucida which aids in trapping and binding the sperm. Two residual coronal cells from the ovarian follicle are attached to the zona pellucida. The egg is sitting on the point of a pin.


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Taken on July 29, 2011