In mammalian eggs, the receptors for sperm are found in the egg plasma membrane.
- To prevent polyspermy in animals, when one of the sperms enters through the egg plasma membrane, entry of any other sperm is prevented.
- The zona pellucida is a layer that covers the egg's plasma membrane and is responsible for the protection of the egg.
- Cortical granules that line the egg's plasma membrane are filled with enzymes that prevent the entry of more than one sperm into the egg.
Thus, in mammalian eggs, the receptors for sperm are found in the egg plasma membrane.
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