Figure 5. The gene orders of a gene cluster of 12 protein-coding genes in Rickettsiales (red), Holosporaceae (green), the SAR11 group (purple) and the free-living Rhodospirillum rubrum (black).

Each arrow represents a gene in the cluster. Arrows with dotted lines represent a missing gene. Genome rearrangements are shown as dotted lines between two genes, with the distance between them shown above the lines. Because of the incomplete nature of some genome assemblies, the exact distance between two genes could not be determined. In this case, a minimum distance was estimated as the sum of distances of each gene to the end of the contig it was located on. For the same reason, the orientation of some genes could not be determined (indicated by asterisks below the genes).