Summary The serum of a Finnish patient contains an antibody to a previously unknown red cell antigen provisionally called Ul a . The antigen is possessed by 2.6% of 2620 Helsinki blood donors though in certain Finnish isolates it is more frequent: it is inherited as a dominant character. The symbol Ul a is provisional because, although the antigen was shown by independent segregation in families not to belong to the ABO, MNSs, P, Rh, Lutheran, secretor, Duffy, Kidd or Dom‐brock systems, nor to be X‐ or Y‐linked, it has yet to be shown to be genetically independent of the versatile Kell system and of the Yt and Diego systems.
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Furuhjelm et al. (1968) studied this question.
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