Two human chromosomes

Human chromosomes (like the two pictured) seem to undergo changes in the amount of methylation as people age. This might hold a clue to aging, authors say.

( ©ANDREW SYRED/PHOTO RESEARCHERS / June 11, 2012 )

Human chromosomes (like the two pictured) seem to undergo changes in the amount of methylation as people age. This might hold a clue to aging, authors say.

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