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Mechanical properties of a GelMA–RF hydrogel and a GelMA–Irgacure2959 (IR) hydrogel. The compressive moduli of a GelMA-RF hydrogel and a GelMA-IR hydrogel were measured and appeared to not be significantly different. The stiffness of the two hydrogels was within the range suitable for osteoblast differentiation. Error bars represent the SD of measurements performed on five samples.
