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Angiogenesis evaluation 12 weeks after the operation. (A) Representative images of the cross section of regenerated nerve after microvessel immunofluorescence staining. Vascular endothelial cells were stained with CD31 (red). (B) Microvessel density (per cross section) in each group. Scale bar =100 μm. ***p < 0.001. Data are expressed as the mean ± SD
