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Limits to lifespan

It has long-been accepted that normal somatic cells have intrinsic mechanisms that limit their proliferative lifespan. Recent work has now challenged this view by demonstrating that extrinsic factors might be determining proliferative potential.

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Figure 1: Mechanisms of inducing senescence.
Figure 2: Culture conditions can activate a checkpoint response that triggers senescence.
Figure 3: Signals that induce senescence induce p16INK4A expression by distinct mechanisms.

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Lloyd, A. Limits to lifespan. Nat Cell Biol 4, E25–E27 (2002). https://doi.org/10.1038/ncb0202-e25

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