Cellular senescence: a reflection of normal growth control, differentiation, or aging?

Abstract excerpt

Normal cells, with few exceptions, cannot proliferate indefinitely. Cell populations--in vivo and in culture--generally undergo only a limited number of doublings before proliferation invariably and irreversibly ceases. This process has been termed the finite lifespan phenotype or cellular senescence. There is long-standing, albeit indirect, evidence that cellular senescence plays an important role in complex...

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