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Structure of a skeletal muscle.

Description
F Each sarcomere has a dark Z band at either end, and alternating rows of thick and thin protein filaments in between them. G Thick filaments are composed of parallel bundles of the motor protein myosin. A myosin molecule has a head that can bind to actin and a long tail. H Thin filaments consist mostly of the globular protein actin, with lesser amounts of two other proteins (troponin and tropomyosin). |<— sarcomere —>| myosin head tropomyosin actin troponin
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