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Effects of RosA on iNOS and COX‐2 expression in chondrocytes. Chondrocytes were pre‐treated with various concentrations of RosA for 1 hr prior to IL‐1β (10 ng/ml) for 24 hr. The protein levels of iNOS and COX‐2 in chondrocytes were assessed by Western blot analysis. The experiment is representative of three experiments performed. Data are expressed as mean ± standard deviation (SD). *P < 0.05 compared with cells stimulated with IL‐1β only.
