A human sixteen-cell embryo, also called a morula (latin for mulberry). The embryo has gone through four cycles of cell division to get to this stage and the cells have undergone compaction whereby they flatten onto each other.
B0000022 Human 16 cell embryo. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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