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.
KeywordsMajor Histocompatibility Complex Human Major Histocompatibility Complex Electrophoretic Variant Oriental Population Human Major Histocompatibility Complex Class
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