Fig. 3. Spatial aspect of anchorage. (A) Plot of the spatial position of the anchorage points (diamonds), corresponding to the maximum of the anchorage coefficient function and depicted by the yellow cross on trajectories, as illustrated in Fig. 1, for control trajectories recorded on fibroblasts. Trajectories were aligned by rotation with the cell body along the positive x-axis (as measured by the direction of the linear movement after anchorage), with the initial point of the trajectory assigned to the origin of the plot. Note that the mean position (square, indicated by the arrow) is already situated along the positive abscises. Trajectories anchored from the beginning were discarded for this plot. (B,C) Histograms of the abscises and ordinates of the receptors positions during the first, diffusive phase. Note that the mean abscise is positive whereas the ordinates are centered on 0 (arrows).