The Lud Cold Agglutinin: A Further Antibody Recognizing N‐Acetylneuraminic Acid‐Determined Antigens not Fully Expressed at Birth

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Abstract
From a patient, a new type of human cold agglutinin, Lud, which reacts with a determinant involving N-acetylneuraminic acid and which is not fully expressed at birth, is described. This antibody differs from a recently described cold agglutinin, Fl. The antigenic determinant recognized by antibody Lud is diminished after treatment of erythrocytes with proteases, whereas that recognized by Fl is not.