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blastula vs. blastocyst
[ blas-chuh-luh ]
noun,
- the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity.
[ blas-tuh-sist ]
noun
- the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast.