An immune antibody, made in response to transfusion, has revealed a new antigen (Wka) with a frequency of 0.3% among English blood donors, and 0.1% among K+ blood donors. The families of 5 K+ Wk(a+) propositi have no recombinants and 13 non‐recombinants. The new antigen is shown to be part of the Kell blood group system.
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Strange et al. (1974) studied this question.
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