Antigens present in leukemic sera and organ extracts, but absent from non-leukemic sera and tissues, were detected by examining their reactions with anti-microbial antisera by means of counter-immunoelectrophoresis. Out of 110 different antisera used, 12 antisera, those produced against Micropolyspora, Coccidioides, Salmonella, Mycoplasma, Mycobacterium simiae, Absidia, pseudo-rabies virus and adenovirus, proved to react regularly with the leukemic sera. Absorption studies point to an immunological specificity of these cross-antigenicities. Interpretations and implications of these discoveries are discussed in the paper.
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