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Steady-state plot of AP, the unscaled control coefficient dap/ds, and the scaled control coefficient (dap/ds)(s/ap) over a range of signal, S, values. The kinetics are given by saturable Michaelis–Menten rate laws. Note the sigmoid response in AP and the spike in sensitivity due to the zero-order ultrasensitivity. See Model 5.1 in appendix A.
