Figure 4

Genomic areas with non-random IS density in the cyanobacterial symbiont NoAz. Locations of ISs >70% target length for selected repeats in NoAz. Red ticks indicate IS locations. The area of interest is marked with green borders. In the middle of each circle is listed the probability for the IS elements of interest to come in close proximity by chance alone, and the data used to compute this probability. For NoAz_R_21, a circular tree based on uncorrected p-distance (see Methods) has been superimposed on the genome, showing that elements that are similar in nucleotide sequence are located close to each other. NoAz_R_21 elements were chosen in this example because of the simplicity of display, other IS elements make up similar albeit more tangled trees. Numbers at tick marks show genomic position in Mbps.