Properdin Factor B
The properdin factor B (BF) polymorphism comprises two common alleles, F and S; two less common alleles, Fl and SO.7 (previously termed SI); and several further rare alleles, described by Mauff et al. . These electrophoretic variants have been used in traditional linkage analyses to map the structural gene coding for factor B between HLA-B and HLA-DR . Molecular mapping  suggests a single factor B locus in this region, closely linked with the C2 locus and proximal to C4A and C4B loci.
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