IL-1F8 protein levels in control individuals, patients with RA, OA and septic shock. Shown are serum IL-1F8 protein levels in healthy donors (n = 16), patients with RA (n = 28) or OA (n = 16) patients, and patients with septic shock (n = 12), as determined by ELISA. Individual values (grey dots) and mean (stippled lines) ± standard error (black lines) are shown. Differences between the groups were not significant. ELISA, enzyme-linked immunosorbent assay; IL, interleukin; OA, osteoarthritis; RA, rheumatoid arthritis.