Abstract
Routine blood typing demonstrated two populations of red blood cells in a dizygotic female twin. Approximately 30 per cent of the red blood cells are A1B, MS/Ns, cde/cde and 70 per cent are O/O, Ns/Ns, CDue/cde. Red blood cell typing and secretor tests on the family showed the minor population to be the true genetic cell line of the propositus. Further evidence of chimerism is revealed by the presence of both XX and XY karyotypes. Tissue cultures showed only XX, lymphocyte cultures only XY, and buccal smears were chromatin positive. There was no evidence of two populations of white blood cells by leukocyte antigen typing. Comparative studies of the male twin were impossible because of his death three months prior to this discovery; however, he was reported by the Armed Services to the AB, Rh negative and we presume he had a mixture of A1B and O cells and that he was genetically group O.
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