| http://www.w3.org/ns/prov#value | - By the time the growing embryo reaches the uterus, the sixteen or so stem cells, called a morula, quickly generate cells to raise the total to more than one hundred cells, differentiating into mostly trophoblast stem cells (directed toward constructing the placenta and related tissues and membranes) and very few pluripotent stem cells, called embryoblasts.
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