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CytoplasmSarcoplasmMyofibrilSarcomereM lineA bandH zone


In electron micrographs of the sarcomere, the M line appears as a series of parallel electron-dense lines in the central zone of the A band impliing that the M line is needed for the regular packing of the thick filaments. The M line maintains the myosin filaments in a hexagonal lattice.


M band


› Cellular component


M band [ GO:0031430 ]
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