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Abstract
Different forms of myosin heavy chains (MyHCs), coded by a large family of sarcomeric MYH genes, are expressed in striated muscles. The generation of specific anti-MyHC antibodies has provided a powerful tool to define the fiber types present in skeletal muscles, their functional properties, their response to conditions that affect muscle plasticity and their changes in muscle disorders. Cardiomyocyte heterogeneity has been revealed by the serendipitous observation that different MyHCs are present in atrial and ventricular myocardium and in heart conduction tissue. Developmental MyHCs present in embryonic and fetal/neonatal skeletal muscle are re-expressed during muscle regeneration and can be used to identify regenerating fibers in muscle diseases. MyHC isoforms provide cell type-specific markers to identify the signaling pathways that control muscle cell identity and are an essential reference to interpret the results of single-cell transcriptomics and proteomics.
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