The unsettled questions on stem cells
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![Adult stem cells](https://img.apmcdn.org/4a31a923100c307e71c7b9e419000de6e0a4a043/uncropped/a4c746-20070613-stemcells.jpg)
Rare adult stem cells from umbilical cord blood shown early in culture.
Image courtesy of BioE and the University of Minnesota
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