To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 1 Movie S1. Time-lapse movie of a cell spreading on control substrate, recorded every 10 min. Total duration, 9.5 h. Fibroblasts probe substrate rigidity with filopodia extensions before occupying an area Stephanie Wong, Wei-Hui Guo, and Yu-Li Wang PNAS. 2014. DOI: 10.1073/pnas.1412285111 Download Original Video Browse All Videos »