To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S4. Direct correlation between F-actin at the tip and force transduction from the filopodium to the optically trapped bead. As the F-actin signal increases near the tip, a displacement of the trapped bead is observed. Helical buckling of actin inside filopodia generates traction Natascha Leijnse, Lene B. Oddershede, and Poul M. Bendix PNAS. 2014. DOI: 10.1073/pnas.1411761112 Download Original Video Browse All Videos »