Blastocyst
The blastocyst possesses an inner cell mass from which the embryo will develop, and an outer layer of cells, called the trophoblast, which will eventually form the placenta.
This is a drawing of a blastocyst. The blastocyst possesses an inner cell mass from which the embryo will develop, and an outer layer of cells, called the trophoblast, which will eventually form the placenta. The endometrium, inner cell mass, trophoblast, and blastocyst cavity are identified on the drawing.
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