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Figure 9 | BMC Systems Biology

Figure 9

From: Specialized or flexible feed-forward loop motifs: a question of topology

Figure 9

Schematic example of induction and relaxationdynamics. In (a) the system evolves from the initial stable state ϕX = 0to the final state ϕX > 0upon addition of an external input. In this case the geometrical constraints of the nullclines upon input (brown) allow for a pulser dynamics (P+T+). In (b) after input deletion the system evolves from ϕX > 0to ϕX = 0. The relaxation dynamics is determined by the shape of the nullclines without input (blue). Here the dynamic is grader (G-). The same mathematical analysis has been performed in both cases, only considering X > 0 or X = 0 to analyze induction and relaxation dynamics respectively.

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