Updated project metadata. This project involves proteome characterization of healthy monocytes polarized (activated) with synovial fluid (SF) versus serum from patients with juvenile idiopathic arthritis (JIA). The objective is to investigate the influence of SF on monocytes at the proteome level, using serum polarized monocytes as a control. Monocytes were isolated from peripheral blood mononuclear cells of healthy donors following negative selection and were subsequently polarized overnight with 20% of a pool of either serum or SF. They were subsequently detached and used for proteome analysis.