title: Hidden' IgG antiglobulins in normal human serum.
abstract: Hidden antiglobulins reacting with whole rabbit immunoglobulin were found by radioassay or indirect haemagglutination after gel filtration or ultracentrifugation of normal serum. Suprisingly, both the IgM and IgG antiglobulins were present in the same macroglobulin fractions. The IgG antiglobulins could be dissociated into 7S components by separating the serum under acid conditions. Antiglobulin activity was a function of the Fab region.
mesh_terms: D000888:Antibodies, Anti-Idiotypic / Q000032:analysis*; D000936:Antigen-Antibody Complex; D001666:Binding Sites, Antibody; D002850:Chromatography, Gel; D006386:Hemagglutination Tests; D006801:Humans; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G / Q000032:analysis*; D007075:Immunoglobulin M / Q000032:analysis; D008970:Molecular Weight
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000936:Antigen-Antibody Complex; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D007075:Immunoglobulin M