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S. No.
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Primary follicle
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Secondary follicle
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1.
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It is the structure that is formed when the primary oocyte is surrounded by a layer of granulosa cells.
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When the primary follicle becomes surrounded by more layers of granulosa cells and a thecal layer, it is called a secondary follicle.
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2.
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Many primary follicles degenerate before puberty.
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There is no degeneration of secondary follicles.
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