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muscle fiber
any of the cells of skeletal or cardiac muscle tissue. Skeletal muscle fibers are cylindrical multinucleate cells containing contracting myofibrils, across which run transverse striations. Cardiac muscle fibers have one or sometimes two nuclei, contain myofibrils, and
are separated from one another by an intercalated disk; although striated, cardiac muscle fibers branch to form an interlacing
network.

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