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  Primary ovarian follicle

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 1. Cuboidal follicle cells

 2. Primary oocyte

 3. Nucleus

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This image shows a primary follicle.  In primary follicles, the follicular cells become cuboidal in shape and may be present in one or several layers.  This contrasts with primordial follicles in which a single layer of squamous (flat) cells surrounds the primary oocyte.

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