[ALL-Associated antigen: occurrence on normal blood cells, cell-lines and leukaemic cells (author's transl)].

The specificity of an antiserum against ALL-cells lacking B- and T-cell markers was characterized. The antiserum was used in several indicator systems to investigate the expression of leukaemia-associated antigens on normal lymphocytes, lymphoid cell lines and various leukaemia cells. The relevance of such antisera for the detection and classification of leukaemic cell populations is discussed.