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Musclin controls skeletal muscle fiber type. (A) Representative immunohistochemical stains for fiber type in cross-sections of biceps femoris (BI) and tibialis anterior (TA) of exercise-trained WT and Ostn-KO mice. Red, IIB; green, IIA; blue, I; black, IIX staining. (B) Summary statistics for fiber type as assessed by counting the number of stained fibers per field. *P < 0.05 vs. WT.
