Steady-state characteristics of the EGFR and GPCR frequency response. The amplitude ratio AR, the phase lag, ϕ and the steady-state time delay between the input and output waveforms are plotted for the EGFR (A) and GPCR (B) systems. The D and k
values corresponding to each of the colored lines for the respective receptor systems are the same as the ones indicated in Figs. 2 and 4.