Biophysical model reproduces key features of group motility during finger merging.

<p>In these simulations, the direction of light bias (white arrows) is rotated 90 degrees between frames 1 and 2. The cells (green) leave an EPS trail (red), and when a finger intersects the EPS trail left by a neighboring finger, the group of cells speeds up and spreads out (blue arrows, frame 3). We observed the same qualitative changes in finger merging experiments (<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003205#pcbi-1003205-g002" target="_blank">Fig. 2</a>).