Pluripotent Cells
In humans, after the first four days, the cells are no longer able to produce every type of tissue required; they have already begun to differentiate. At this stage they can already be broadly grouped into the three primary germ layers; the ectoderm (covering tissues such as skin and retina), endoderm (the gastrointestinal tract, respiratory tract, the liver and the pancreas) and the mesoderm (mostly connective and circulatory, such as bones, heart, blood vessels and muscles). As these tissues are able to produce multiple cell-types but are not able to produce all cell-types they are termed pluripotent, from the latin pluralis meaning more.
Stem Cells
The totipotent and pluripotent cells where sourced from an embryo are a classified as embryonic stem cells, cells within the embryo from which other types of cell originate.
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