C4 haplotypes with duplications at the C4A or C4B loci: frequency and associations with BF, C2, and HLA-A, B, C, DR alleles.
D003181:Complement C4 / Q000235:genetics*; D005796:Genes; D008040:Genetic Linkage; D006680:HLA Antigens / Q000235:genetics*; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006801:Humans
D003181:Complement C4; D006680:HLA Antigens; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II