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ECB-STAGE-15

Name: 2-cell stage

ECAO ID: 0000160

Definition: "An embryo that is composed of two cells and is surrounded by a fertilization envelope. The first cleavage plane took place meridionally (i.e. along the animal-vegetal axis), thereby generating two blastomeres of equal size, each containing both animal and vegetal cytoplasm."


Preceded By: 1-cell stage Succeeded By: 4-cell stage