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The 1HNMR analysis of GelMA and DMA (A & B). (C) Optical photographs of the Gel before (left) and after (right) UV irradiation and soaked with Zn2+ solution. (D) Scanning electron images of Gel and Gel@Zn hydrogels, scale bar: 100 μm. (E) Swelling and (F) degradation rate of Gel, Gel@Zn-0.04, Gel@Zn-0.08 and Gel@Zn-0.16 hydrogels (n = 6). (G) Controlled release of Zn2+ in Gel@Zn-0.04, Gel@Zn-0.08, and Gel@Zn-0.16 hydrogels.
