The simulations show the impact of the phosphorylation dependency of the transducin activation rates for the toad rod scenario defined in Table 2. The behavior of the phosphorylation, arrestin binding, and transducin activation rates are given by Eqs. 48–50 with ωλ = 0.1 and Np = 6. For ωact = (0.1, 0.3, 0.6) the rates λN and the kact(N) are given by (3.2, 3.2, 3.2) s−1 and (245, 356, 482) s−1.