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The JAL antigen was found to have an overall frequency of 0.004% in the Swiss population and 0.06% in French-speaking Swiss. Family studies of 5 JAL+ individuals have shown that the JAL antigen is not part of the ABO, MNSs, Fy, Jk and Co blood group systems, or the Se system, nor is it X- or Y-linked. JAL is encoded by the RH locus or by a very closely linked locus. The number RH48 (4.48) has been assigned for JAL by the International Society of Blood Transfusion Working Party on Terminology for Red Cell Surface Antigens.
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Poole et al. (1990) studied this question.
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