Fig. 7
From: Detection of biological switches using the method of Gröebner bases
Bistable system with an output that does not switch at steady-state. Three steady-states are marked by black circles. The middle one at Z = 2, Y = 10 is the unstable steady-state. Trajectories starting from different initial conditions converge to the stable steady-state, where the output (Y) value does not change (i.e. Y = 9). The red curve is the production rate of Y which is the locus of steady-states for Y as a function of Z