Fig. 4

AT content is correlated with tandem array expansion. A–G Comparison of number of A OR genes in the Hemoglobin β (HBB) cluster, B LCE, SP100, and SRR genes in the Epidermal Differentiation cluster, C CYP2A genes in the CYP2ABGFST cluster, D SERPINA genes, E KRTAPs and KRTs in the Type I KRT locus, F KRTAPs in the high tyrosine-glycine KRTAP cluster, and G the HOXA locus with cluster GC% across mammals. All p-values report results of phylogenetic least squares analysis (PGLS). H Average GC% across the cluster, intergenic, intronic, promoter, and coding sequence of each tandem array. Each point represents one mammal species from panels A–G. I PGLS slope values and J R-squared values of phylogeny-corrected correlation of feature GC% to cluster GC%. Asterisks represent magnitude of PGLS p-values for each relationship, i.e., one asterisks represents a p-value between 0.05 and 0.01, two represent a p-value between 0.01 and 0.001