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Lumbrical muscle from the third digit of the forepaw of a mouse. A: wild-type (WT) muscle is shown beside a 30-gauge hypodermic needle. B: hematoxylin and eosin-stained cross section of a WT lumbrical muscle. Muscles typically consist of 200–250 fibers and are ∼300 μm in diameter. C: mdx muscle. Dystrophic features include presence of central nuclei and mononuclear cell infiltration. All scale bars are 200 μm and B and C share the same scale.
