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ECB-STAGE-20
Name: 32-cell stage
ECAO ID: 0000210 Definition: "An embryo that is composed of 32 cells and is surrounded by a fertilization envelope. Note for euechinoid indirect developers: The micromeres have undergone a fifth cleavage (and this has occurred prior to a subsequent division of the other cells). This cleavage was unequal and equatorial, thereby producing four large micromeres and four small micromeres, the smallest cells still marking the vegetal pole." |
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Preceded By: 28-cell stage | Succeeded By: 56-cell stage |