BlastocystA
preimplantation embryo of 30-150 cells. Contains a layer of specialized cells is
made up of trophoblasts, which attach to the uterine wall and form the
placenta. Inside the trophoblast layer is the inner cell mass. These
cells remain undifferentiated. Embryonic Stem cells are derived from the
inner cell mass.
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Contributed
by: AAAS/DoSER
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