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Individual examples of DNIC-induced inhibitions triggered by flexion of the ankle in a rat with acute monoarthritis and in a rat with chronic monoarthritis. Each histogram corresponds to a sequence of 100 stimuli during which C-fiber-evoked responses of a trigeminal convergent neuron were recorded before, during (arrows), and after flexion of either the normal or the arthritic ankle. Ordinate, Number of C-fiber-evoked spikes; abscissa, time.
