Figure 2.

(A and B) Responses of the Tar-only mutant (f₁ = 1, dashed line), the Tsr-only mutant (f₂ = 1, dot-dashed line), and the WT strain (f₁ = f₂ = 0.5, solid line) to a series of pH steps with varying step sizes and but same ambient pH level (pH₀ = 7.0). (C) Their relative responses (normalized by the maximum response value among all the data points in each subfigure) versus the poststimulation pH, denoted as pH₁ = pH₀ + ΔpH. (Left panel) Obtained from our model results in panel B and is compared with the experimental measurements (right panel) in Yang and Sourjik (9).