The bifurcation diagram of the steady-state gene expression in the toggle switch circuit with respect to <i>kg</i>₀, for combination of <i>m</i> and <i>n</i>.

Solid and dashed correspond to stable and unstable steady states. The solid circles denote the saddle-nodes (SN1-2, blue/orange dots) or pitchfork bifurcation points (PF, yellow dots). (TIF)