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Representative SDS polyacrylamide gel stained with Coomassie blue following electrophoretic separation. Bands shown are MHC isoforms type I, type IIA, and type IIX, in gluteus muscle from young (YGlut) and aged (AGlut), and triceps muscle from young (YTri) and aged (ATri) American Quarter Horses. The middle lane shows the molecular mass markers at 250 and 150 kDa.
