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The cytotoxicity of celecoxib in human C-28/I2 chondrocytes. Cells were treated with celecoxib at concentrations of 0, 1, 5, 10, 20, 100, 200 μM for 24 hours. (a) The molecular structure of celecoxib; (b) The effects of celecoxib in cell viability of human chondrocytes (*, **, P < 0.05, 0.01 vs. vehicle group)
