Figure 5
From: Specialized or flexible feed-forward loop motifs: a question of topology
Schematic representation of two areas characterizing the behaviour of the trajectory. The nullclines of the system with input are depicted in brown. Any trajectory starting in the pink area will reach the nullcline Ż = 0 first and then follow its path to the fixed point ϕX > 0. Any trajectory starting in the blue area will reach the fixed point directly without intersecting the nullcline first. The frontier between these two regions, the separatrix, is drawn in green. As example some trajectories have been depicted to illustrate their qualitatively different course.