Abstract
Abstract. Ouchterlony precipitin tests give visual evidence that extracts from Lotus tetragonolobus contain two different lectins. In addition to the H antigen, Lotus identifies another antigen, called the L antigen, which is not the A, B, Lea, Sda, I or SC1 saliva antigen and has been found in variable strength in secretor and nonsecretor saliva of individuals of all ABO blood groups. The L antigen is part of a cathode migrating glycoprotein. Sugar inhibition studies reveal that the terminal sugars are the same as for the H and Lea antigens, the presumable difference being that l‐fucose is attached to a different site. The L antigen is absent in the saliva and red cells of the Bombay type, but red cells of all other individuals absorb both lectins from Lotus extract.
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