PIV analysis of epithelial sheets migrating on fibronectin strips of varying widths showing the spatial distribution of
velocity fields as a heat map (right). A change in the collective behavior is recorded for the larger channels that move by
swirling motions compared to the contraction–relaxation-based mode experienced through the narrow channels. Reproduced with
permission from ref 128. Copyright 2012 Sri Ram Krishna Vedula, Man Chun Leong, Tan Lei
Lai, Pascal Hersen, Alexandre J. Kabla, Chwee Teck Lim, and Benoît Ladoux.