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64-Cell Stage (4 days)

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Last updated: Jul 8th, 2025
64-Cell Stage (4 days)
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At the 64 cell stage, the embryo reaches the morula stage. At this point, the center of the morula begins to fill with fluid from the uterine cavity. As the space within develops, two distinct types of cells will form. The outer wall will develop trophoblasts and the inner cells will develop embryoblasts.