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Immunohistochemical staining of MEK in the injured side of dorsal root ganglion under UHF-TENS treatment. A significant increase in signal intensity was induced by nerve constriction injury in the control group compared to sham group as the baseline. After UHF stimulation, the signal intensity of MEK decreased significantly on Day 1through Day 5. (n=4 per group; Scale bar: 20 μm; positive neuron: orange solid arrowhead; negative neuron: orange hollow arrowhead).
