Abstract
A ‘new’ rare blood group antigen Rla (Rosenlund) is reported. The antigen is present in about 1 in 900 Norwegians. Nine unrelated Rl(a+) people were found. Studies of seven families, leading to the discovery of 20 additional Rl(a+) people, indicated the antigen is inherited as a Mendelian dominant character. Independent segregation was demonstrated between RZa and the ABO, MNSs, Rh, Lutheran, Duffy and Kidd blood group systems, the ABU secretor genes, and sex. The Rla antigen is inactivated by papain treatment. The corresponding antibody, anti-Rla, has so far been found in three sera that also contain antibodies to other rare blood group antigens.

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