Surprising Results Found With Stem Cell Treatment

Surprising Results Found With Stem Cell Treatment
A researcher prepares stem cells in Madison, Wisconsin, on March 10, 2009. Darren Hauck/Getty Images
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Stem cells have had a colorful and exciting history in the medical world, with both supporters and patients claiming surprising results. But what exactly are stem cells?

For decades, researchers have experimented with stem cells from fetal tissue. Aside from the moral and ethical dilemma this posed, these cells isolated from embryonic tissue were later shown to cause tumors. Fortunately, many researchers abandoned these experiments.