Fig 2From: Cytokine detection and simultaneous assessment of rheumatoid factor interference in human serum and synovial fluid using high-sensitivity protein arrays on plasmonic gold chipsIL-20 levels in synovial fluid and serum samples. a) IL-20 levels are higher in synovial fluid samples from patients with RA compared with OA (p < 0.001). Each dot represents the average concentration for 1 patient based on 3 independent experiments, median and interquartile range is shown. b) IL-20 levels in serum samples from RA, OA and HC. Data are represented as in (a). c) IL-20 levels in matched serum and synovial fluid samples from OA and RA patients. Data are represented as in (a). IL-20 serum levels in OA patients were higher than matched SF levels (p = 0.008)Back to article page