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The expression of µ-opioid receptor in the dorsal skin of SPF (D, E, F and H) and conventional (A, B, C and G) NC/Nga mice. The data show one typical experiment for 10 animals. Scale bar = 100 µm. Values are presented as the mean ± SD from 10 animals. *p<0.05 in comparison to no exercise SPF or conventional NC/Nga mice.
