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When a sperm gets into the egg, the entry of a second sperm should be prevented through two reactions. |
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As soon as one sperm enters the egg, two reactions occur that prevent a second sperm from entering. |
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Upon the entry of one sperm into the egg, two reactions take place so that the entry of a second sperm may be prevented. |
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Just as a sperm enters an egg, two reactions usually occur which aim at preventing a second sperm from entering. |
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It is known that two reactions occur for the prevention of a second sperm's entry. |