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ECB-STAGE-16
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Name: 4-cell stage
ECAO ID: 0000170 Definition: "An embryo that is composed of four cells and is surrounded by a fertilization envelope. The second cleavage plane was meridional and perpendicular to the first one, thereby producing four blastomeres of equal size, each containing both animal and vegetal cytoplasm." |
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| Preceded By: 2-cell stage | Succeeded By: 8-cell stage |