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Human chondrocytes were treated with IL-1β. A: Cell viability was determined using the CCK-8 assay; B: FGF18 mRNA level was assayed by qPCR after IL-1β treatment for 24 h; C: FGF18 protein level was assayed by western blot after IL-1β treatment for 48 h. **P < 0.01 and ***P < 0.001 versus control; ##P < 0.01, 10 ng/mL versus 30 ng/mL.
