Older stem cells don't just wear out, they actively shut themselves down

Older stem cells dont just wear out, they actively shut themselves down,
University of Michigan News,
September 06, 2006 ,

"A trio of papers published on-line Sept. 6 in the journal Nature shows that old stem cells donâ€™t simply wear out, they actively shut themselves down, probably as a defense against becoming cancerous from genetic defects that accumulate with age."

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