Traction force dynamics in abp120⁻ cells. (A and B) Kymograph of the instantaneous magnitude of the traction stresses and axial tension for an abp120⁻ cell. The black circles in A denote protrusion events. A detailed view of the pseudopod protrusion resulting from sideways squeezing is shown in B, corresponding to the time interval indicated by the black box in A. Top, middle, and bottom rows show the magnitude of the total, axial, and lateral stresses, respectively. The inclined red and black lines indicate the instantaneous position of the front and back cell edges. (C) Same as Fig. 3 B but corresponding to the abp120⁻ cell shown in A. (D) Same as Fig. 5 J for n = 12 abp120⁻ and n = 12 wild-type cells.