Conception, the fertilization of an egg by a sperm, normally occurs in the fallopian tubes. The next step for the fertilized egg is to implant into the walls of the uterus, beginning the initial ...
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The human egg locks like Fort Knox after it’s fertilized. Scientists finally find out howThey found that immediately after the egg is fertilized by a sperm, the surrounding egg coat tightens, acting as a hard barrier that stops additional sperm. This critical process, detailed for the ...
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