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Effect of resveratrol on rheumatoid arthritis fibroblast-like synoviocyte invasiveness. Crystal violet staining of invaded cells in a Transwell assay from (A) control cells without resveratrol treatment, (B) 1 µg/ml resveratrol, (C) 3 µg/ml resveratrol and (D) 10 µg/ml resveratrol groups. *P<0.01. Scale bar, 100 µm.
