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Definitions of F Actin

  1.   Filamentous proteins that are the main constituent of the thin filaments of muscle fibers The filaments known also as filamentous or F actin can be dissociated into their globular subunits each subunit is composed of a single polypeptide 375 amino acids long This is known as globular or G actin In conjunction with MYOSINS actin is responsible for the contraction and relaxation of muscle