Blackwell Publishing Journal Backfiles 1879-2005
A fourth human blood group chimaera studied in Birmingham is an example of haemopoietic (twin) chimaerism in which the subject was unaware of being a twin. Chimarerism was discovered during routine antenatal serological investigation in which it was shown that the proposita has two red cell populations, one of the rhesus genotype rr, and the other R1r. Further studies showed that she has two populations of lymphocytes, one with the female karyotye, 46XX, and the other with the male karyotype, 46XY. Skin fibroblasts were all 46XX.
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