title: High frequency of IgG anti-A and -B antibody in old age.
mesh_terms: D000017:ABO Blood-Group System; D000368:Aged; D003176:Complement C3 / Q000032:analysis; D005260:Female; D006801:Humans; D005779:Immunodiffusion; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis / Q000378:metabolism*; D007075:Immunoglobulin M / Q000032:analysis / Q000378:metabolism*; D007518:Isoantibodies; D008297:Male; D010641:Phenotype
chemical_list: D000017:ABO Blood-Group System; D003176:Complement C3; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007518:Isoantibodies