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Cell death may spur aging

Genetic mutations in cells' internal powerhouses could contribute to aging by stifling tissue maintenance, according to new research.

These power-generating organelles, known as mitochondria, have their own DNA separate from that in a cell's nucleus. In a previous study, researchers in Sweden created mutant strains of mice that accumulated excess mitochondrial mutations. The mice aged faster than normal, suggesting that mutations contribute to aging.

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