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The formation of the fertilization envelope (slow-block to polyspermy) requires an increase in the availability of _____.

User Momboco
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The formation of the fertilization envelope (slow-block to polyspermy) requires an increase in the availability of calcium ions.

Slow-block to polyspermy is also called cortical reaction. In this reaction, the sperm will be permanently blocked by cortical granules. The release of calcium ion will trigger this reaction.
User Marius Tancredi
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