Abstract
A model of the human Rh blood group system is proposed which is based on discontinuous gene structure. The R29 control subregion consists of a single exon flanked by introns. Following the R29 subregion, the R1 subregion exists as 7 exon structures which alternate with introns. The expression of each exon is controlled by flanking introns. A separate exon-intron structure controls expression of the Rh: -1 phenotype. Differential gene expression is controlled by intron sequences and complementary splicer RNA sequences encoded by unlinked loci.