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( Sarcomere)
"A-band" redirects here. For other uses of the term see A band. A sarcomere is the basic unit of a muscle's cross-striated myofibril. Sarcomeres are multi-protein complexes composed of three different filament systems. A muscle cell, from a bicep, may contain 100,000 sarcomeres. The myofibrils of smooth muscle cells are not arranged into sarcomeres. The sarcomeres are what give skeletal and cardiac muscles their striated appearance.
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