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Double-labeling studies indicating retrograde tracer (red) and immunofluorescence for FOS (green) are shown for sham-operated and nerve-injured rats. FOS expression was evoked by light touch or by noxious pinch. There was very little to no labeling for FOS in any of the identified PSDC profiles in either the sham-operated or nerve-injured groups after either light or noxious stimuli.
