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Blastula

An early stage embryo of about 100 cells that has not yet implanted into the womb. The blastocyst is a sphere made up of an outer layer of cells, a fluid-filled cavity and cluster of cells inside called the inner cell mass. The blastocyst develops after cleavage and prior to implantation at approximately five days. Further reproductive development occurs only if the blastocyst is successfully implanted in the uterus.

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