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ECB-STAGE-17
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Name: 8-cell stage
ECAO ID: 0000180 Definition: "An embryo that is composed of eight cells and is surrounded by a fertilization envelope. The third cleavage took place perpendicular to the first two cleavage planes and was equatorial. It thus generated an animal and a vegetal hemisphere each composed of a quartet of four cells of equal volume." |
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| Preceded By: 4-cell stage | Succeeded By: 16-cell stage |