Stem cells are a class of undifferentiated cells that are able to differentiate into special cell types.
They are important because they represent an area in medicine, because they have the potential to regenerate and repair damaged tissue.
Not all stem cells come from embryos but also bone marrow, your teeth and other places.
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Greeks regarded mythology as a part of their history. They used myth to explain natural phenomena, cultural variations, traditional enmities and friendships.
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