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The Redelberger Antigen Rba

Abstract. A new low frequency antigen, Rba, has been found in three blood donors. Studies on their families show that the antigen is inherited as a Mendelian autosomal dominant character. Rba segregates independently from ABO, MNSs, P1 Rh, Kell, Duffy, Kidd, ACP1 and PGM1. Anti‐Rba is not uncommon in sera containing multiple antibodies to low frequency antigens.