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(A, B) Immunohistochemical analysis of the type I collagen and type III collagen was assessed at 2 and 4 weeks postoperatively, magnification×200. The native tendon was formed by type I collagen, moreover, the paratenon (red arrow) was formed by type III collage (left). After regeneration, type III collagen was noticeable in the sample. (C) Semi-quantitative analysis of the content of collagens types I and III (*p < 0.05). Type I collagen increased gradually over time
