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(A) Equilibrium swelling properties of the GelMa hydrogels. Error bars represent the SDs of measurements of six samples. (*) and (**) indicated p < 0.05 and p < 0.01, respectively. (B) Cryo-imaging of the hydrogel microstructure. The G5, G10, and G15 samples were exposed to 365 nm UV light at a distance 30 cm for 90 s.
