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Effects of swimming excise on CGRP expression in rats after nerve injury surgery. (A) Histological micrographs of CGRP expression. The anatomic position of CGRP expression was separately accounted for the dorsal and ventral positions. The CGRP of dorsal horn showed the highest expression of whole horizontal view of spinal cord (B) Quantitation for the ratio of CGRP expression area. The values represent means ± SD for each group. *Significant difference (P < 0.05) compared to SC group. Scale bar = 200 μm.