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Cells eventually stop dividing and enter a “senescent” state in response to various forms of damage.

Fort lauderdaleUnited statesSonoma countySan franciscoXu zhang mayoViviana perez montesChristopher wileyRichard sollerPaul moorheadJames kirklandLeonard hayflickJudith campisiNathan lebrasseurMarta lavandierBuck institute for research onUniversity of california