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Effects of treadmill exercise on tyrosine hydroxylase (TH) expressions in the prefrontal cortex, striatum, hippocampal dentate gyrus, and substantia nigra. A, sham-operation group; B, sham-operation and treadmill exercise group; C, traumatic brain injury (TBI)-induced group; D, TBI-induced and treadmill exercise group. The scale bar represents 150 μm. *P<0.05 compared to the sham-operation group. #P<0.05 compared to the TBI-induced group.
