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public text v1 · immutable\footnote{Sneddon, L. U.,
Braithwaite, V. A., Gentle, M. J. \href{http://rspb.royalsocietypublishing.org/content/270/1520/1115.abstract?sid=a09fc72d-2a25-4a8f-9f36-d79a3d151e30}{Do fishes have nociceptors? Evidence for the evolution of a vertebrate sensory system.} {\it Proc. R. Soc. Lond. B} {\bf 270}, 1115-1121 (2003).}