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Nature 457, 970-971 (19 February 2009) | doi:10.1038/457970a; Published online 18 February 2009

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Neuroscience: Good and bad cell death

Donald W. Nicholson1

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Neurodegeneration often has disease connotations. However, it is also a developmental process for fine sculpting of the nervous system. One signalling cascade might mediate the process in both circumstances.

A major driver of neurodegeneration in Alzheimer's disease is thought to be plaques of amyloid-beta peptides. These 40–42-amino-acid fragments form when the transmembrane amyloid-beta precursor protein (APP) is degraded by the enzymes beta- and gamma-secretase.

  1. Donald W. Nicholson is at Merck Research Laboratories, Rahway, New Jersey 07065, USA.
    Email: donald_nicholson@merck.com

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