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Location in the dorsal horn of each pruritogen responsive STT neuron with HT or WDR classification indicated. A, Histamine responsive STT neurons were mostly located in the marginal zone and the nucleus proprius. Cowhage responsive units were located within the marginal zone and also within the lateral reticulated area. C, Location of the 29 recovered recording points of the 38 total STT units not excited by either histamine or cowhage.
