Simulated swelling curves and experimental data. The color lines with the + signs are the swelling curves from the experiments at different Ca2+-concentrations (40 - 140 μ M). The solid black lines are the corresponding rescaled numerical approximations of the volume (V (t)) obtained from the model. V (t) was rescaled linearly (cf. Methods - Optical density measurements) considering the highest and lowest values of the measured light scattering data and the corresponding simulated volume curve, respectively.