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Seropositive rheumatoid arthritis (RA) is characterized by autoantibodies binding to citrullinated and homocitrullinated proteins. We wanted to study the expression patterns of these disease-associated protein forms and if the rheumatoid nodule and synovial tissue itself contain biologically active
Rheumatoid arthritis (RA) was one of the first systemic disorders to be considered an autoimmune disease. Two major aspects of RA suggest a fundamental immune-mediated derangement in the disease: (1) presence of often massive lymphocytic infiltrates and activated CD4(+) T cells within the inflamed
Granulomatous inflammation is associated with a variety of important pathologic conditions. Osteopontin (OPN), a ligand for the alpha v beta 3 integrin, is a secreted glycoprotein with a glycine-arginine-glycine-aspartate-serine cell-binding domain. In this study, we examined expression of OPN in 22