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**__Related stories:__***linkurl:Slow sensing ages stem cells;http://www.the-scientist.com/blog/display/55090/
[15th October 2008]*linkurl:Mitotic cells: separate but unequal;http://www.the-scientist.com/blog/display/54653/
[19th May 2008]
Researchers have identified the mechanism for why hair goes gray with age and stress -- and in the process discovered a novel response to DNA damage in stem cells, they report in the June 12 issue of __Cell.__ It's generally thought that accumulated DNA damage is a likely culprit in aging phenotypes such as graying hair, but researchers have been unable to show a direct link, said linkurl:David Fisher;http://www2.massgeneral.org/cancer-research/profiles.aspx?id=156 chairman of the department of
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