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Three components of the complement pathway C2, Factor B, and C4 are coded for by four genes C2, Bf, C4A, and C4B in the class III region of the major histocompatibility system in man. Studies of the polymorphism of these plasma proteins have shown associations of BfS, C2C, and C4B3 (2.9) with RA. Family studies have shown that these markers occur together, usually on DR4 positive haplotypes and in particular on the A2-Cw3-Bw62-C4B3-C4A3-BfS-C2C-DR4 haplotype. It is argued that Class III gene products are unlikely to be independent markers of susceptibility to RA.
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