Figure 3. The steady-state curve of mdm2 mRNA is plotted as a function of the intensity of ionizing radiation, ρ.

The black squares indicate the first peaks of the mdm2 oscillations when the Model is simulated at different values of ρ, with each simulation having identical initial conditions (equal to the steady states of the system at ρ  =  0 Gy). The vertical line at ρ = ρ* = 13.8 Gy marks the value where the peak of mdm2 oscillation is attracted to the upper branch of steady states.