Cleavage Stage, Ovum |
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| Cleavage Stages, Ovum; Ovum Cleavage Stage; Ovum Cleavage Stages; Ovum Segmentation Stage; Ovum Segmentation Stages; Segmentation Stages, Ovum | |
| The embryo in its earliest stage, lasting from the first mitotic division of the fertilized ovum (ZYGOTE) into two BLASTOMERES to the formation of the MORULA, a compact mass of blastomeres. | |