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Swelling and enzymatic degradation (mass loss) of GelMA-based hydrogels. (a) Swelling ratio of GelMA and nanotube-modified GelMA-based hydrogels with and without CHX loading in DPBS at 37 °C. (b) In vitro biodegradation of GelMA and nanotube-modified hydrogels in DPBS containing 1 U/mL of collagenase type I at 37 °C. The results are presented as mean ± SD (n = 4).
