Fig. 5From: Mathematical modelling of SigE regulatory network reveals new insights into bistability of mycobacterial stress responseNullclines plot under the assumption of constant RseA concentration. Under the assumption of constant RseA concentration, the number of intersection points between the input–output relationships from Module 1 and from Module 2 implies that the closed-loop system exhibits a unique equilibrium point. For the ease of readability, the logarithmic scale has been adopted for x- and y-axis. E stands for SigEBack to article page