Reprogrammed stem cells hit a roadblock

It's a discordant note in the symphony of good news that usually accompanies stem cell research announcements. Stem cells hold enormous promise in regenerative medicine, thanks to their ability to regenerate diseased or damaged tissues. They have made it possible to markedly improve the effectiveness of many medical treatments - muscle regeneration in cases of dystrophy, skin grafts for treating burn victims, and the treatment of leukaemia via bone marrow transplants...

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