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Results of Immunohistochemistry of KATP channel on the spinal cord dorsal horn (magnification of 10×). The results of immunohistochemistry on the spinal cord dorsal horn shows no difference among the naïve group (A, no formalin test), normal saline group (B, IT normal saline 10 min before formalin injection) and pregabalin group (C, IT pregabalin 10 µg administered 10 min before formalin injection) in pixel intensities of KATP channel.
