Distribution of segregating sites and Ka/Ks ratios in the oci gene cluster. The ratios are displayed using the program DnaSP and sliding windows analysis on the alignment of 205-oci and 116-oci. Window length was 50 bp and step size 10 bp. The distribution of segregation sites (red) and Ka/Ks (black) ratios are shown in correlation with the domain alignment. Module 2 (T2-(E)-C2) has been excluded from the analyses.