c cells. They also found that, just as embryonic cells have been shown to do, these adult stem cells produced both C-peptide, a part of the insulin precursor protein, and insulin itself. Confirming the presence of the C-peptide was especially crucial, the researchers suggested, because although insulin is often found in the growth media with which the cells are nurtured and is often taken up by such cells, the presence of the C-peptide proves that at least some of the insulin was produced, or synthesized, by the engineered cells.
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Source:University of Texas Medical Branch at Galveston


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