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In vivo bone regeneration after 6 weeks of implantation of the bone hydrogels. (a) H&E and Masson's trichrome staining of histological sections of calvarial decalcified sections after hydrogel implantation. (b) Immunohistochemical staining of skull tissue. (c) Quantitative analysis of immunohistochemical staining (n = 3, *p < 0.05, **p < 0.01, and ***p < 0.001).
