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Characterization of HVH hydrogels. (a) Photographs of the hydrogel prepared by hydration of 15 (w/v) % concentration of HPG695-PPG2000-HPG695 copolymer overnight at 4 °C (FS was added as a colorful dye). The prepared hydrogel can be injected through a 23G needle. (b) Photographs of hydrogels after inverting the vials for 24 hours.
