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H-E stain of Pre- (A) and Post- (B) FES muscle biopsies from horse 7003 (10 yr) and 7005 (15 yr). In A and B, arrows point to atrophic, angulated (denervated) muscle fibers. Arrowheads in B point to muscle fiber with central nuclei. Note that B is a magnified image. Bar, 100 μm
