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What are the functions of actin in nonmuscle cells?

In nonmuscle cells, actin forms a dynamic and tightly regulated cytoskeletal network of microfilaments that is essential for maintaining cell shape, enabling movement, and coordinating intracellular processes. It supports structural integrity, drives cell motility via structures such as lamellipodia and filopodia, facilitates cytokinesis, contributes to vesicle transport, and plays a key role in cell adhesion.