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[Common ALL-associated antigen on cells and in the serum of common ALL patients: clinical relevance and biochemical characterization (author's transl)].

The clinical application of an antiserum recognizing common ALL associated antigen (cALL-AG) is very useful in classifying leukemias and diagnosing bone marrow relapse as well as CNS-leukemia. We could demonstrate that sera of common ALL (cALL) patients contain cALL-AG; its partial biochemical characterization is described. The anti cALL serum (cALL-AS) was raised in rabbits with cALL-cells precoated with rabbit antiserum against normal human lymphocytes. After appropriate absorbtion the cALL-AS was highly specific for cALL cells. The isolation of serum cALL-AG was performed by ammoniumsulfat precipitation, gel chromatography and affinity chromatography on agarose lens culinaris hemagglutinin A (lentil lectin). The apparent molecular-weight of the serum glycoprotein is 125 000. Two cALL-AG active structures could be solubilized from cALL cell membrane. The apparent molecular-weights were calculated to be 55 000 and 110 000.