In the blastocyst, the

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The trophoblast is the outer layer of cells in the blastocyst and is responsible for implanting the blastocyst into the uterine wall and eventually forming the fetal portion of the placenta. The inner cell mass is the group of cells inside the blastocyst that will go on to form the embryo and fetus. The blastocoele is a fluid-filled cavity that initially provides space for the inner cell mass to develop before it is eventually replaced by the amniotic cavity.

In the Blastocyst, the