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The Moment of Fertilization

When a sperm attaches itself to the surface of an egg, the egg is almost immediately impervious to other sperm. What happens in the egg during this critical biological event?

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Scientific American Magazine Vol 201 Issue 1This article was originally published with the title “The Moment of Fertilization” in Scientific American Magazine Vol. 201 No. 1 (), p. 124
doi:10.1038/scientificamerican0759-124