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Representative examples of synovial tissue sections stained for interleukin-8 (CXCL8) protein expression [immunohistochemistry, CXCL8 monoclonal antibody (mAb)] and CXCL8 mRNA expression (in-situ hybridization, anti-sense CXCL8 riboprobe) in normal synovium and in synovial tissue from paired clinically uninvolved knee joints and clinically involved knee joints of rheumatoid arthritis (RA) patients and control sections with a sense probe or aspecific mAb.
