Quantitative Comparison Between Simulation and Experimental Results. The quantitative comparison of simulated concentration response data with experimental data on EGF. The solid line represents the mean steady state fold change of AP-1 activity (relative to control) across 100 replicates with 1000 cells per replicate, simulated over a range of values from 0 to 25 ng/ml EGF. The 95% confidence interval across replicates is in blue. The experimental results of BrdU incorporation are plotted with standard deviation as points.