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Pronunciation: sperm′as′tĕr
Definition: Cytocentrum with astral rays in the cytoplasm of an inseminated ovum; it is brought in by the penetrating spermatozoon and evolves into the mitotic spindle of the first cleavage division.
[sperm + G. astēr, a star (aster)]
Examples: glitazone, GI cocktail, etc.
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