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Fig. 6. The physiological response of chick trigeminal ganglion neurons to methyl
anthranilate (MA) was also dependent on extracellular sodium, but responses to
capsaicin (CAP) were not. (A) The response of a neuron that did not respond to
MA when extracellular sodium was removed. The response returned when sodium
was re-introduced. (B) A capsaicin-induced increase in intracellular
Ca2+ even in the absence of extracellular Na+.