Photo: #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.

Challenges to stem cell research


Stem cell research proponents have convinced some states to fund research, but the controversy continues over whether using embryonic stem cells crosses an ethical line. Experts on both sides debate where stem cell research is headed.

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