16-Cell Stage (3 days)
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
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The 16-cell stage occurs about three days after fertilization. At this point, the morula is still a solid mass; it will typically move into the uterine cavity as it approaches the 16 cell stage, where it will remain unattached for about 3 days.
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