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The histological analysis of the repairment of the defect with different hydrogels after 4-week implantation. A) Hematoxylin and eosin (HE) and Masson's trichrome staining of SF and SMS were injected in a rabbit maxillary sinus for 4 weeks to evaluate inflammatory response. B) Immunohistochemical staining for iNOS and Arg. C-E) Quantitative staining analysis. (*p < 0.05, **p < 0.01).
