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(a) Instantaneous endoplasmic flow speed and traction stresses exerted on the substrate by a migrating Physarum fragment. Arrows exhibit the flow speed and colormap shows the magnitude of traction stresses. (b, c) Instantaneous traction stresses exerted by two Physarum fragments with different dynamical behaviors, with the stress vectors along the cell boundary removed. Black circles indicate the location of contraction centers.
