title: Observations on a new example of the A m  phenotype which demonstrates reduced A secretion.
mesh_terms: D000017:ABO Blood-Group System; D003298:Coombs Test; D005260:Female; D006382:Hemadsorption; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis*; D007158:Immunologic Techniques; D007518:Isoantibodies / Q000032:analysis*; D008623:Mercaptoethanol / Q000494:pharmacology; D010206:Papain / Q000494:pharmacology; D010375:Pedigree; D010641:Phenotype; D012463:Saliva / Q000276:immunology*; D013489:Suppression, Genetic
chemical_list: D000017:ABO Blood-Group System; D007070:Immunoglobulin A; D007518:Isoantibodies; D008623:Mercaptoethanol; D010206:Papain