Computational characterization of PDGF-BB transport (parameter estimation and difference computation with regard to experimental values for collagen and fibrin hydrogels considering four different conditions: (Case 1) the values obtained in the degradation experiments are assumed as degradation rates and binding is neglected; (Case 2) the degradation rates are accepted from the degradation experiments and binding ratios are fitted to reduce the average difference in both channels; (Case 3) binding is neglected and the degradation rates are fitted to reduce the average difference in both channels; (Case 4) both degradation and binding rates are fitted to reduce the average difference in both channels).