Feed-Forward Loop Network Motif (2D)

The feed-forward loop is systems biology's most common three-gene network motif: an input transcription factor X drives an intermediate gene Y, and a downstream gene Z is controlled by both X and Y together through Boolean AND/OR promoter logic. This 2D simulator integrates the same ordinary differential equations as the 3D version — rendering the circuit as a flat node-and-edge diagram with particles streaming along the regulatory edges — and adds a scrubbable strip chart of X(t), Y(t) and Z(t) so the sign-sensitive delay between AND and OR logic is visible directly as a time-series trace, not just inferred from glowing nodes. Fire a short or a long input pulse, switch between AND and OR logic, and scroll/drag on the chart to zoom and pan through the last ~40 seconds of history.