Fig. 7. Summary histogram of relative magnitudes and rates of change in traction stress and cell speed under all experimental conditions and for different phases of the feedback cycle. (A) Percent change in traction stress (black) and cell speed (gray), before increases in [Ca²⁺]_i and after calcium-induced retractions, and treatments that inhibit calcium transients. (B) Rate of change (percent/second) of the parameters shown in A. In all cases an inverse relationship exists between traction stress and cell speed, except for EDTA treatment.