Fig. 2.

Distribution of SNPs with high $|iHS|$ values ($|iHS|\ge 2$) in the a) CYP3A and b) CYP4F cluster. A triangle standing on its base means an $iHS$ value ≥2, indicating that the ancestral allele has increased in frequency, and a triangle standing on its point means an $iHS$ value $\le -2$, indicating that the positive selection is acting on the derived allele. SNPs located in repetitive elements and sequences are masked. Rectangles below the plot show the position of each gene, and arrows indicate on which strand the gene is located.