Implantation of the zygote in the uterus occurs after it has formed into a blastula, but before the cells begin to differentiate.

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Implantation typically occurs 6-10 days after fertilization and after the zygote has undergone several cell divisions, forming a blastula. The blastula then implants into the endometrial lining of the uterus, but cell differentiation does not begin until after implantation.

Implantation of the Zygote in the Uterus Occurs After It