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Why pain sometimes lingers

Animals have nerves that can make a soft caress painful.

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  1. Bessou, P. & Perl, E. R. J. Neurophysiology 32, 1025-1043 (1969).

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  2. Seal, R. P. et al. Nature advance online publication doi:10.1038/nature08505 (2009).

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Buchen, L. Why pain sometimes lingers. Nature (2009).

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