3D displacement fields from force-tracking beads as a fibroblast cell crawls on a gel substrate. Upward moving beads are shown in red, downward in green. Selected for an Editors' Suggestion and a Synopsis in Physics.

From the article:

4D Traction Force Microscopy Reveals Asymmetric Cortical Forces in Migrating Dictyostelium Cells
H. Delanoë-Ayari, J. P. Rieu, and M. Sano
Phys. Rev. Lett. 105, 248103 (2010)

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