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St. Paul, Minn.

Challenges to stem cell research

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Stem cell cultures
Stem cell cultures are placed under a microscope in a lab at the Reeve-Irvine Research Center at the University of California Irvine August 25, 2006 in Irvine, Calif.
Photo by Sandy Huffaker/Getty Images
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Stem cell cultures
Stem cell cultures are placed under a microscope in a lab at the Reeve-Irvine Research Center at the University of California Irvine August 25, 2006 in Irvine, Calif.
Photo by Sandy Huffaker/Getty Images