To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S7. T. foetus motility in high-viscoelasticity medium PAM. Recorded at 20 FPS, replayed at 10 FPS. (Scale bar: 20 μm.) Microgrooves and fluid flows provide preferential passageways for sperm over pathogen Tritrichomonas foetus Chih-kuan Tung, Lian Hu, Alyssa G. Fiore, Florencia Ardon, Dillon G. Hickman, Robert O. Gilbert, Susan S. Suarez, and Mingming Wu PNAS. 2015. 112:5431-5436 DOI: 10.1073/pnas.1500541112 Download Original Video Browse All Videos »