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SEM analysis. Pure chitosan showed a porous structure (A), pure collagen gels exhibited a fibrous network (D), and mixed chitosan-collagen materials exhibited a composite structure with collagen fibrils interspersed with chitosan matrix (B and C). The collagen-containing gels had a similar collagen fiber diameter (E). Pure chitosan gels had the largest pores among all groups (F). (* = statistically significant differences; scale bar = 4 µm)
