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A mammalian embryo at the stage at which, after cleavage, it is implanted in the wall of the uterus. It consists of a thin-walled, hollow sphere (trophoblast) enclosing a blastocoel. Attached to the inner surface of the trophoblast at one end there is a sheet of cells that will become the embryo proper.

Subjects: Medicine and Health — Zoology and Animal Sciences.

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