Course of the degree of phosphorylation of X in dependence on the growth rate. Since most experiments are performed with lactose and glucose, the specific growth rate can be converted with (nearly) the same yield coefficient (on a molar basis) into an uptake rate. Left: Growth on non-PTS carbohydrates (lactose and glycerol, wild type and mutant strain BKG47); Right: Growth on PTS carbohydrates (glucose, wild type). Dashed lines indicate a 95% confidence interval based on the simulated and the experimental data. The calculation is based on a linearization around the estimated parameters, therefore, it is not exptected that all the data can be found in-between the two limits.