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Effect of UA on chondrocyte viability. a, b, c Chondrocytes were treated with various concentrations of UA and/or IL-1β and then analyzed by CCK-8 assay (1, 3, and 7 days). d Chondrocytes were treated with 20 ng/ml IL-1β combined with different concentrations of UA (1, 7.5, and 15 μM) for 2 days and then stained with Alcian Blue. Data are presented as mean ± S.D. n = 6, *P < 0.05, **P < 0.01 versus Control
