title: Evidence that blood group A antigen on lymphocytes is derived from the plasma.
abstract: Serum from group O volunteers, who had been injected with porcine A blood group substance, was used in lymphocytotoxicity tests. Positive reactions were obtained only with lymphocytes of group A secretors; the strongest reactors were Le(a--b--). The same group O sera reacted with group O lymphocytes which had been exposed to a glycosphingolipid fraction prepared from the plasma of A,Le(a--b--) secretors. These reactions were specifically inhibited by A substance. It is suggested that, unlike the A antigen on red cells, the A antigen detected in lymphocytotoxicity tests is entirely derived from the plasma.
mesh_terms: D000017:ABO Blood-Group System; D000941:Antigens; D002462:Cell Membrane / Q000276:immunology; D003601:Cytotoxicity Tests, Immunologic; D006801:Humans; D008214:Lymphocytes / Q000276:immunology*
chemical_list: D000017:ABO Blood-Group System; D000941:Antigens