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Transverse sections of m. pectoralis major (PM), and m. gastrocnemius (GAS) stained with two monoclonal antibodies against specific myosin heavy chain (MyHC) isoforms. Red arrows point to examples of fibers with positive immunostaining for type IIB fibers; Green arrows point to examples of fibers with positive immunostaining for type I fibers. Magnification of 800 × was used (Bar = 20 μm).
