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Picrosirius red staining of repair cartilage from biopsy specimens obtained at 48 weeks postimplantation. (A) A fibrous collagen architecture was observed not only in the upper zone, but also in the lower zone for patients 2, 3, and 4. Bar = 1 mm. (B) Higher magnification views of picrosirius red staining of repair cartilage at the lower zone for patients 1 and 3. Bar = 100 μm.
