title: Investigations of variables affecting rheumatoid factor reactivity and tests. I. Influence of amboceptor concentration, ratio of IgG to IgM, and source, in the sheep-cell agglutination test.
mesh_terms: D000372:Agglutination Tests; D000704:Analysis of Variance; D000818:Animals; D000906:Antibodies; D000937:Antigen-Antibody Reactions; D001172:Arthritis, Rheumatoid / Q000097:blood / Q000276:immunology*; D003165:Complement System Proteins; D004912:Erythrocytes / Q000276:immunology; D006461:Hemolysis; D006801:Humans; D007074:Immunoglobulin G / Q000502:physiology*; D007075:Immunoglobulin M / Q000502:physiology*; D066298:In Vitro Techniques; D011817:Rabbits / Q000276:immunology; D012217:Rheumatoid Factor / Q000502:physiology*; D012756:Sheep / Q000276:immunology
chemical_list: D000906:Antibodies; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D003165:Complement System Proteins; D012217:Rheumatoid Factor