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Pronunciation: blas′tō-sist
Definition: The modified blastula stage of mammalian embryos, consisting of the embryoblast or inner cell mass and a thin trophoblast layer enclosing the blastocystic cavity or blastocele.
Synonym(s): blastodermic vesicle
[blasto- + G. kystis, bladder]
Examples: glitazone, GI cocktail, etc.
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