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The fabrication and characterization of GelMA stiffness gradient hydrogel. (A) Schematic of UV polymerization. (B) Atomic force microscopy (AFM) measurement. (C) Images from cryo-Scanning electron microscopy (SEM) showed an inverse correlation to stiffness. (D) Raman scanning does not show a significant change in amide amount on the stiffness gradient. Reproduced with permission from Kim et al. (2020).
