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The schematic shows how transient focusing of bound molecules can be achieved by an apolar filament mesh. Myosin motors (inward double arrows) bound to actin filaments (lines) apply active contractile stresses upon activation, which locally compress the mesh. Reactant molecules (dots) bound to the meshwork will be brought together for chemical reaction by such local contractile stresses. The mesh can locally remodel due to myosin turnover.
