title: Reduction of pleural fluid complement activity in patients with systemic lupus erythematosus and rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002499:Centrifugation, Density Gradient; D003172:Complement C1 / Q000378:metabolism; D003174:Complement C1 Inactivator Proteins; D003175:Complement C2 / Q000378:metabolism; D003168:Complement Fixation Tests; D003165:Complement System Proteins / Q000378:metabolism*; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D010996:Pleural Effusion / Q000276:immunology*
chemical_list: D003172:Complement C1; D003174:Complement C1 Inactivator Proteins; D003175:Complement C2; D003165:Complement System Proteins