Abstract
AbstractNonagglutinating human (anti‐Rh) and rabbit (anti‐G and anti‐g) iso‐antibodies and agglutinating rabbit and hamster γG antibodies against sheep erythrocytes were tested for rheumatoid factor reactivity and for complement‐fixation using papain‐treated and nontreated cells. Although the papain treatment increased the agglutination of the erythrocytes by the antibodies, no change was observed in the complement‐fixing properties. The minimum amount of rabbit γG antibody on the cell surface required for the RF reactivity was the same with papain‐treated and non‐treated cells and of the same magnitude in three serological systems (rabbit incomplete anti‐G and anti‐g and rabbit antisheep cell). This amount of sensitizing antibody was 1/8–1/16 of the amount required for complement‐fixation and for agglutination by a type of RF reactivity that could not be inhibited by native rabbit γG globulin.
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