Abstract
A consanguineous family has been typed for HLA-A, B, C, D, DR and GLO, Bf, C2 and C4 and other red cell markers. The results indicate that an expected Dw7 homozygous sibling is a "Dw1"/Dw7 recombinant, probably derived from a crossing over between DR and D on the paternal haplotypes. The anomalous typings by Dw1 HTCs of the recombinant haplotype are best explained by the likely presence of an additional Lad polymorphism which could be a serologically detectable second epitope on the same molecule as the HLA-D determinant or in the form of two linked chains, one encoded by HLA-D and one by another Lad gene in the HLA haplotype.
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