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Zona pellucida

A glycoprotein coating that surrounds the outer layer of the ovum (egg) and early embryo. The zona pellucida disappears just prior to implantation of the early embryo into the uterine wall.
 


Zygote ( fertilized egg )

The cell that results from fusion of a sperm and egg at fertilization. After three divisions the zygote is called a morula.

   

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