Microfilaments
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Microfilaments are the cytoskeleton's narrowest fibers, built from two intertwined actin strands, and function in cellular movement and shape.
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Actin filaments track the motor protein myosin; sliding actin and myosin past each other makes a muscle cell contract.
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A student may assume actin filaments exist only in muscle; every eukaryotic cell relies on microfilaments for shape and movement, not muscle alone.