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Master Cells New research at the University of Minnesota and elsewhere suggests that adults carry a reservoir of ''master cells'' inside their bone marrow that - like stem cells taken from human embryos - are capable of becoming almost any tissue in the body. NPR's Joe Palca reports that these findings are likely to shake up the national debate over stem cell research.

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Master Cells

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Master Cells

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New research at the University of Minnesota and elsewhere suggests that adults carry a reservoir of ''master cells'' inside their bone marrow that - like stem cells taken from human embryos - are capable of becoming almost any tissue in the body. NPR's Joe Palca reports that these findings are likely to shake up the national debate over stem cell research.