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Microfilaments or actin filaments are made up of two twisted monomeric actin subunits. They are the thinnest filaments of the cytoskeleton. They function in muscle contraction, cytoplasmic streaming, ameboid movement, and changes in cell shape. Although they are found in all eukaryotic cells, they are found in especially large numbers in muscle cells where they, along with myosin filament, work to contract the muscle.
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