Chromosome organization of strain Eb661 vs. Et1/99 vs. Ep1/96. Chromosomes were compared using ACT. Red lines connect homologous regions present in the same orientation while the blue lines connect regions of inverted orientation. Black bars symbolize chromosomes. Localization of the rRNA operons is indicated by white (16S-23S-5 S rRNA organization) and yellow bars (16S-23S-5S-5 S rRNA organization). Translocated and inverted regions are highlighted in grey and the positions on the chromosomes are provided. The estimated size of these regions, which were modulated by several re-arrangements, is noted in megabases.