Fig. 2From: Patterns of variation in cis-regulatory regions: examining evidence of purifying selectionEstimated means and 95% confidence intervals of a θ π and b Tajima’s D in Africans and Non-Africans for genomic classes across the genome. The threshold for significant difference to non-annotated sequence was set at p < 0.05 (Z < −1.96 or Z > 1.96). Details of the classes found in Table 2Back to article page