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In vivo collagen thickness by Masson staining. (A) The Masson results of GelMA and SsBb/GelMA hydrogels after in vivo implantation at 2, 4, and 8 weeks. (B−D) The thickness of collagen fibrous tissue at 2, 4, and 8 weeks. *p < 0.05, **p < 0.01, ***p < 0.001.
