Simulation of the coupled phase oscillator model in the absence of cell mixing v0 = 0.14 (μm min-1). The spheres represent cells and color code indicates the phase value for each cell. The unit of time (t) in the right bottom box is minutes. The variable Z indicates the phase order parameter defined by Eqn 6. In Movies 3 and 4, we started simulations from the same initial conditions for illustration.