Figure 4. Tajima's D (D_T) values for protein coding genes along the length of the chromosome.

A) all 32 S. meliloti strains, B) the S. meliloti 24 strain group, and C) S. medicae. Genes identified by the D_TH test as targets of recent selection are shown in dark blue. Chromosomes are represented linearly, using the coordinate system of the respective reference genomes, with 0 on the far left (and far right); orthologous homologous positions in the two species are not aligned to each other. The origin of replication in S. meliloti is at position 0 [61], and the putative location of the terminus is marked with a dotted vertical line.