Figure 1. Cell track analysis.

(A) Examples of cell trajectories lasting 50 min obtained at a cell density of . Red arrows represent starting points. (); (B–C) Typical cell tracks, with their origins brought to a common point, are shown for (B) a condition of fast cell displacement (under a perfusion flow of 30 mL/h), and (C) a condition of slow cell displacement (same cell density without flow). (); (D) divided by time lag as a function of time lag for 3 typical cell conditions: red crosses, fast moving cells ; blue crosses, intermediate moving cells ; black crosses: slow moving cells . Solid lines are fits using the Fürth's formula. This plot reveals an overshoot at 2 min. The slower the cells, the larger the overshoot; (E) Mean Square Displacement () as a function of time lag in log-log scale. Green lines: individual for each tracked cells, revealing the large dispersion of our population. Black bold line: Average of all tracked cells; (F) Velocity autocorrelation C(t) as a function of time lag for the same cell conditions as (D), showing a negative peak at 2 min.