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lipid bilayer and control the actin-actin or actin-lipid interactions by the addition of cross-linking proteins. Upon the addition of myosin II motors, we observe the movement of actin and myosin by timelapse confocal microscopy. In the absence of adhesion to the membrane and actin cross-linking proteins, contractility at 10-100 um length scales is only observed for sufficiently long (10 um) actin filaments. To facilitate contraction of short filaments (~1 um), the addition of an actindoi:10.1016/j.bpj.2011.11.1317 fatcat:wwba2qcajjhq7bn2talsywrkoi