Figure 3. Linkage disequilibrium plot and r2 values for five polymorphisms of the ABCB1 gene. (A) D′ plot of five polymorphic linkage disequilibrium. (B) r2 plot of five polymorphic linkage disequilibrium. Linkage disequilibrium was detected in the rs3789243 and rs1858923 polymorphisms ((r2 = 0.310, D′ = 0.815), rs1858923 and rs4148727 polymorphisms (r2 = 0.070, D′ = 0.872).