What are the types of mammalian eggs?
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These type of eggs has 2 egg-membranes:
(1) Zona pelucida: It is a transparent membrane like covering & is a primary membrane secreted by the ovum or oocyte.
(2) Corona radiata: It is a layer of follicular cells & these cells are attached to the surface of egg with hyaluronic acid. This is constituted as the secondary membrane, which is secreted by the ovary. These egg do not have tertiary membrane.
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