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Immunohistochemical staining of c-Fos 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 -Fos decreased significantly on Day 1 through Day 5. (n=4 per group; Scale bar: 20 μm; positive neuron: grey solid arrowhead; negative neuron: grey hollow arrowhead).
