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Role of IL-1β in the proliferation of rat chondrocytes. Rat chondrocytes were exposed to IL-1β (0.5, 1, 2.5, 5, 10 and 20 ng/ml), following which proliferation was assessed using a cell counting kit-8 assay at the indicated times. **P<0.01 vs. Normal group. IL-1β, interleukin-1β; OD, optical density.
