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A B S T R A C T Although granulocyte transfusionsand e. Absorptions indicated that these antigens were present on mature granulocytes but absent from platelets, lymphocytes, monocytes, and myeloid precursors. A single antigen of another separate locus, HGA-1, was also identified. Absorptions revealed a quite different distribution for HGA-1 than HGA-3, this antigen being detected on monocytes and myeloblasts as well as on mature granulocytes. Independent segregation of the three loci from HLA, from the NA-NB and the 5a-5b antigens, and from themselves was confirmed in informative families.Finally, it seems likely that other antigens will be identified because several other sera that react with both monocytes and granulocytes have been detected.

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