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Mean integrated optical density (IOD) for interleukin-8 (CXCL8) protein expression (immunohistochemistry) and CXCL8 mRNA expression (in situ hybridization) in normal synovium and in synovial tissue from paired clinically uninvolved knee joints and clinically involved knee joints of rheumatoid arthritis (RA) patients. Abbreviation: ns, not significant.
