Figure 2From: Circulating surfactant protein -D is low and correlates negatively with systemic inflammation in early, untreated rheumatoid arthritisSize exclusion chromatography of SP-D in serum and synovial fluid. Mean curves of 11 corresponding serum and synovial fluid samples. SP-D was eluted as two structurally different forms (SP-D multimers (fraction 10 to 18) and SP-D trimers (fraction 24 to 38)). SP-D, surfactant protein D.Back to article page