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Serial transverse sections of gluteus medius muscle from a representative Thoroughbred horse stained for immunocytochemistry. The sections were stained with monoclonal antibodies to specific myosin heavy chain (MHC) isoforms. Muscle fibers were classified into Type I (expressing MHC-I), Type IIA (expressing MHC-IIa), and Type IIX (expressing MHC-IIx). A: anti-Fast Myosin (anti-MHC-II), B: SC-71 (anti-MHC-IIa).
