Despite new discoveries, stem cells remain controversial
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![Stem cell cultures](https://img.apmcdn.org/4646dbc3983b189bb7893018ba8ec0fb866756ea/uncropped/cbd947-20060918-stemcell.jpg)
Stem cell cultures are placed under a microscope in a lab at the Reeve-Irvine Research Center at the University of California Irvine.
Photo by Sandy Huffaker/Getty Images
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