Awdeh Z L, Alper C A, Eynon E, Alosco S M, Stein R, Yunis E J
Lancet. 1985 Oct 19;2(8460):853-6. doi: 10.1016/s0140-6736(85)90123-0.
Extended haplotypes are specific HLA B, HLA DR, BF, C2, C4A, and C4B combinations in significant linkage disequilibrium in chromosomes of unrelated individuals. The possibility that matching unrelated individuals for extended haplotypes may match for the genes that cause mixed lymphocyte reactivity was tested. 22 of 26 unrelated extended-haplotype-matched subjects had similar mixed lymphocyte reactivity to HLA-identical siblings.