Definitions of blastocyst
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the blastula of a placental mammal in which some differentiation of cells has occurred
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synonyms:
blastodermic vessicle
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type of:
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blastosphere, blastula
early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
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blastosphere, blastula
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