A significant portion of a complement-fixing activity found in the synovial fluid of patients with rheumatoid arthritis, and previously implicated as a possible cause of the low synovial fluid complement levels in these patients behaves as a high solubility cryoprotein. Analysis of rheumatoid synovial fluid cryoproteins has revealed mixed immunoglobulins, bound complement components, fibrinogen, DNA, and rheumatoid factor.
Robert L. Marcus, Alexander S. Townes
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