BlastocystA
preimplantation <!g>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 <!g>trophoblast layer is the inner cell mass. These
cells remain undifferentiated. <!g>Embryonic Stem cells are derived from the
inner cell mass.
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by: AAAS/DoSER
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