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Muscle fibers were classified into six types according to the distribution of myosin heavy chain (MHC) isoforms: I, MHC I/slow; IIA, MHC 2a; IIAX, MHCs 2a and 2x; IIX, MHC 2x; IIXB, MHCs 2x and 2b; IIB, MHC 2b. Magnification was set to ×100.
