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Enzyme histochemical myofibrillar ATPase, pH 4.5, (A–C) and SDH (D–F) staining of soleus muscle cross-sections from control (A, D), Mstn−/− (B, E), and mIgf1+/+ (C, F) mice, respectively. Muscle fiber types I and IIa are shown. Scale bar = 50 μm.
