Implantation (embryology) - Wikipedia
https://en.wikipedia.org/wiki/Implantation_(embryology)
WEBImplantation, also known as nidation, is the stage in the embryonic development of mammals in which the blastocyst hatches, attaches, adheres, and invades into the wall of the female's uterus. Implantation is the first stage of gestation, and, when successful, the female is considered to be pregnant.
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