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Capsaicin stimulation of sensory neurons causes spreading of dye in trigeminal ganglion. The cellular localization pattern of True Blue in the V3 region of trigeminal ganglion under basal and stimulatory conditions is shown. (A) The dye was primarily detected in a few neuronal cell bodies (arrows) in a punctuate pattern in ganglion obtained from unstimulated control animals. (B) In contrast, the dye was detected in a diffuse pattern 2 hours after capsaicin stimulation.
