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| Cleavage Stage, Ovum Segmentation Stage, Ovum | 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. |