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ECB-STAGE-22
Name: 60-cell stage
ECAO ID: 0000230 Definition: "An embryo that is composed of 60 cells and is surrounded by a fertilization envelope. Note for euechinoid indirect developers: The large micromeres have achieved a sixth cleavage, which was meridional, thereby generating a ring of 8 cells. At that stage, from the animal to the vegetal pole, the embryo is composed of: 16 an1-cells, 16 an2-cells, 8 veg1-cells, 8 veg2-cells, 8 large micromeres and 4 small micromeres." |
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Preceded By: 56-cell stage | Succeeded By: very early blastula stage |