Light microscopic autoradiographic localization of [3H] substance P binding sites in rat thoracic spinal cord

We have used light microscopic autoradiography to look for the distribution of [3H] substance P receptors in the thoracic spinal cord of the rat. High densities of autoradiographic grains were localized to the intermedialateral cell column, the central canal and the substantia gelatinosa of the dorsal horn.