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(A) The healing of cartilaginous defect is obvious in the case group. (B) In the control group, inflammation with cartilage defect is seen. (A and B) Hematoxylin-eosin stain (× 100). (C and D) The collagen deposition is indicated by the blue arrow as shown by Masson trichrome stain (× 100). Inflammation is indicated by the yellow arrow, cartilage regeneration is indicated by the green arrows, and fibrosis or collagen deposition are indicated by the blue arrows.
