Fig. 5. (A) Elastic modulus G′ obtained by rheology measurements, of 5% w/v hydrogels with different FD-RGD mol%, dissolved in cell culture medium and supplemented with 20 mM Ca²⁺ ions. (B) G′ at frequency 5 [rad s⁻¹] of the hydrogels as function of FD-RGD mol% (grey line for guiding the eye).