MONOCLONAL ANTI‐TYPE 2 H: AN ANTIBODY DETECTING A PRECURSOR OF THE A AND B BLOOD GROUP ANTIGENS

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Abstract
A monoclonal antibody was produced which binds specifically to Type 2 H antigen of the ABO blood group system. The antibody, H11, is an IgM molecule which reacts by direct agglutination of red cells with the same pattern as other anti‐H reagents such as Ulex europaeus lectin. The specificity was determined by inhibition and adsorption with chemically defined oligosaccharides. H11 also reacted with poly(glycosyl)ceramide purified from group O red cells and glycoprotein H purified from human stomach mucosa and meconium. H11 differs from Ulex lectin, however, in that it was not inhibited by saliva from ABH secretor individuals or by glycoprotein H purified from human ovarian cysts or submaxillary glands.