To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 5 Knockdown of ephrinB1 stimulates sub-marginal protrusion formation. Time lapse recording shows an aggregate injected with ephrinB1-MO. Cells underlap each other with large smooth-rimmed lamellipodia. PDGF-A suppresses contact inhibition during directional collective cell migration Martina Nagel, and Rudolf Winklbauer Development 2018. 145:None-None; doi: 10.1242/dev.162651 Download Original Video