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Skeletal muscle fibers are highly specialized cells designed for contraction and movement. At the molecular level, each fiber is composed of myofibrils, which are cylindrical structures running parallel along the length of the cell. Myofibrils are made up of repeating units called sarcomeres, which are the functional contractile units of muscle. Sarcomeres contain an organized arrangement of thick __________ _________ ____ ____ _____.
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