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Serum concentrations of soluble Cytotoxic T Lymphocyte Antigen- 4 (sCTLA-4) in patients with spondylarthropathies (SpA, n = 165), with rheumatoid arthritis (RA, n = 71) and healthy controls (HC, n = 88). Circulating sCTLA-4 was measured by ELISA, as described in the Material & Methods section. Horizontal lines represent means (***: P < 0.005; statistical tests and exact p values are given in the Result section).
