<p>(<b>A</b>) Cell speed and (<b>B</b>) directionality (DTO/TD) for HT-1080s as a function of matrix conditions (≥ 6 gels, ≥ 40 cells, at least two separate experiments; * = p<0.05; ** = p<0.01). X-axis: Modulus in Pa / RGD concentration in μM. <i>Box</i> and <i>whisker </i><i>plot </i><i>for </i><i>cell </i><i>speed</i>: White diamond = mean, white line = median, boxes = middle upper (top) and middle lower (bottom) quartile of the cell population, whiskers = highest (above) and lowest (below) migration speeds. Error bars for DTO/TD represent standard error of the mean for individual cells. There is also a statistical difference in cell speed for the 140 Pa (1500 μM RGD) and 220 Pa (250 μM RGD) conditions (p<0.05, not shown on graph for clarity). (<b>C</b>) A comparison of the fraction of rounded HT-1080s (Elongation Index < 2.0) as a function of synthetic ECM conditions (x-axis: Modulus in Pa / RGD concentration in μM; white bar = 140 Pa; black bars = 220 Pa). Error bars represent standard deviation for fraction of rounded cells per gel (≥ 6 gels, at least two separate experiments; * = p<0.05; ** = p<0.01; *** = p<0.001). </p
