Posted AT 3:57 AM EST on 23/10/06
A sobering setback in stem-cell research
The progress of science is paved with stories of high hopes and heartbreaks. But in a busy lab at the University of Rochester the two extremes have met in one dazzling yet devastating experiment.
Researchers there have for the first time essentially cured rats of a Parkinson's-like disease using human embryonic stem cells. But 10 weeks into the trial, they discovered brain tumours had begun to grow in every animal treated.
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