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Biodegradation of (a) GO-GelMA hydrogels and (b) MeGO-GelMA hydrogels, induced by treating the hydrogels with collagenase (1 U mL−1). The concentration of GO or MeGO was varied from 0 to 3 mg mL−1 (c) The degradation rates (kD) of the hydrogels were obtained by fitting the linear region (first 15 hours) of the plots in (a) and (b) with Equation 1. (*p<0.05)
