Cytokinesis: Contractile Ring Constriction (2D)

This 2D companion to the 3D Contractile Ring simulator views the dividing cell's equator face-on: 72 discrete actomyosin nodes, each carrying its own local ring radius, contract under a Laplace-type purse-string tension while a cortical coupling term lets neighbouring nodes exchange a little of that tension and smooth out local irregularities — a real particle-based mechanism rather than a redraw of the 3D scene, whose continuum limit reduces exactly to the same T/R tension law. Dial in myosin-II motor activity, cortical resistance and the width of the RhoA-active equatorial zone to see how each reshapes the furrow, or add a Latrunculin-like actin poison to watch a stalled furrow's nodes relax back open, while live readouts track ring radius, ingression rate, elapsed division time and the ring's own irregularity.