Rectilinear speed per cellular track of invasive and rotational MDA-MB-231 cells in 2-cell clusters (n= 20 individual cells,n= 10 cell clusters). All error bars represent standard deviation from the mean. Statistical significance is indicated as ns, not significant, (*) p ≤ 0.05, (**) p ≤ 0.01, (***) p ≤ 0.001, and (****) p ≤ 0.0001.
