Figure 3. Effects of a load on transition times of the basic toggle switch.

(A). The time taken to reach 90% of maximum value for the protein undergoing a low-to-high transition as a function of the Load, normalized by the steady-state amount of Repressor 1. Normalized time is a unit-less number defined by the transition time (rise or decay) of the system at a given loading condition divided by the transition time (rise or decay) of an unloaded system. (B). The time taken for the concentration of the protein undergoing a high-to-low transition to reach 10% of its maximum value. The x- and y- axes are the same as for the previous panel.