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Nature 459, 334-335 (21 May 2009) | doi:10.1038/459334a; Published online 20 May 2009

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Systems biology: When it is time to die

Philippe Bastiaens1

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Why do cells of the same population respond differently to external death-inducing stimuli? Individuality seems to originate from non-genetic differences in the levels and activation states of proteins.

Any cell biologist can tell you that individual cells from a clonal cell population respond differently to the same stimulus, some not responding at all. In such cases the percentage of responders is seen as a measure of the experimenter's control over parameters that affect the stimulus, such as uniformity of the cellular environment.

  1. Philippe Bastiaens is at the Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany.
    Email: philippe.bastiaens@mpi-dortmund.mpg.de

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