To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S3. TFP-deficient (∆pilA) (green) cells move past WT (red) cells at the swarm edge during swarm development. Frames were captured once every second for 2 min—playback is 10 frames per second (i.e., movie is 10× acquisition speed). Type IV pili interactions promote intercellular association and moderate swarming of Pseudomonas aeruginosa Morgen E. Anyan, Aboutaleb Amiri, Cameron W. Harvey, Giordano Tierra, Nydia Morales-Soto, Callan M. Driscoll, Mark S. Alber, and Joshua D. Shrout PNAS. 2014. DOI: 10.1073/pnas.1414661111 Download Original Video Browse All Videos »