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**The surrounding of the oocyte by a single layer of cuboidal granulosa cells which are capable of hormone production.
 
**The surrounding of the oocyte by a single layer of cuboidal granulosa cells which are capable of hormone production.
 
**Separation of the oocyte from the granulosal cells by a thick layer of material known as the zona pellucida.
 
**Separation of the oocyte from the granulosal cells by a thick layer of material known as the zona pellucida.
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