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The same patients exhibited a considerable overlap of native C3, C4, and properdin factor B levels when their results were compared with those of OA patients. The parallel increase of C3d, C4d, and Ba levels in patients with RA suggests an activation of the complement system rather than a nonspecific enzymatic breakdown in synovial fluids.<\/jats:p>","DOI":"10.1002\/art.1780200202","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T18:05:24Z","timestamp":1171476324000},"page":"647-652","source":"Crossref","is-referenced-by-count":36,"title":["Correlation between levels of breakdown products of C3, C4, and properdin factor b in synovial fluids from patients with rheumatoid arthritis"],"prefix":"10.1002","volume":"20","author":[{"given":"L. H.","family":"Perrin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R. 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