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miR-146a-FLS-Exos inhibit cartilage degeneration and synovial inflammation in rats. (A) HE staining was used to observe the morphological characteristics of AC (×40). (B) Saffranin O-solid green staining was used to observe changes in the proteoglycan content in the cartilage matrix (×40). (C, D) HE staining was used to observe the morphological characteristics of the synovium (C. ×40, (D) ×20).
