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The cytochalasins are cell-permeable fungal metabolites that inhibit actin polymerization.[1],[2],[3],[4] This interferes with such diverse processes as cell movement, growth, phagocytosis, degranulation, and secretion.[5],[6],[7],[8] Cytochalasin D is a cell-permeable inhibitor that binds actin filaments, but not actin monomers, to inhibit polymerization at concentrations as low as 0.2 µM.2 In this way, it prevents the migration of tumor cells.[9]

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