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mRNA expression of let-7e in patients with KOA and a rat model of KOA. (A) Expression of let-7e in the serum of patients with KOA and controls. (B) Expression of let-7e in the serum of a rat model of KOA. (C) Expression of let-7e in the cartilage of a rat model of KOA. *P<0.05, **P<0.01. SMS, Si-Miao-San; KOA, knee osteoarthritis.
