Biology — Cell Cycle
G1 → S → G2 → M with the G0 resting state.
Rendering…
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digraph CellCycle {
node [shape=ellipse, style=filled, fillcolor="#dcfce7"];
G1 -> S -> G2 -> M -> G1;
G1 -> G0 [label="exit"];
G0 -> G1 [label="re-enter"];
}