Cell segregation with simulation length.

<p>The degree of cell segregation as measured by the like∶mixed type ratio score (S, Y-axis) is plotted against ‘virtual time’ measured by the square-root of the number of time-steps in thousands (X-axis. e.g., 30 = 30×30 thousand = 900,000 steps). The filled circles are data from full simulations starting with a random mix of cell types and the open circles started from artificially segregated cells. The latter are plotted at the predicted time when the best-fit line to the full simulation data (solid line) cuts the mean value of the segregated data (horizontal dashed line).