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High histocompatibility of 3D-printed HGGelMA and GelMA hydrogel scaffolds. (A) Animal experimental process. (B) The images of H&E staining at 20th days and 40th days after implantion. Black arrows indicated the new blood vessels in the pores of hydrogels. (C) The relative expression level of collagen I, SMA, PDGF and CD31 genes in implanted scaffolds by qPCR analysis.
