Figure 1From: Natural autoantibodies reactive with glycosaminoglycans in rheumatoid arthritisCorrelation between serum and synovial fluid anti-glycosaminoglycan (GAG) IgM and IgG antibodies in rheumatoid arthritis (RA). Note the strong and statistically significant correlation (p < 0.001) between the corresponding IgM anti-GAG concentrations in serum and synovial fluid samples. Such a relation could not be demonstrated for IgG antibodies (r = 0.13, N.S).Back to article page