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. 2022 May 13;19:678–689. doi: 10.1016/j.bioactmat.2022.05.008

Fig. 2.

Fig. 2

Preparation and characterization of PAA-RGD, PEG-RGD, and GelMA hydrogels. (a) Cartoon illustration of the PAA-RGD hydrogel formation. (b) Strain-stress curves of the hydrogels in the compression study. (c) Swelling curves of the hydrogels (P < 0.001). (d) Protease K-induced degradation rate of PAA-RGD, PEG-RGD, or GelMA hydrogels in vitro (P < 0.001). (e) Representative SEM images of the hydrogels. Scale bars, 100 μm. The polymer content was fixed at 10 wt% for all of the hydrogels. Statistical significance was calculated using one-way ANOVA with Tukey's post-hoc test. ***P < 0.001.