Schematic representations of gene essentiality within the genomic context. Representations are shown for (a) the pha gene cluser (574,031…582,547 bp), (b) the gum gene cluster (1,912,494…1,927,020 bp), (c) the transposable element containing the putative OLD family endonuclease XHV734_0172 (180,015…183,519 bp) and (d) the genomic island containing the restriction-modification system composed of restriction endonuclease XHV734_3749 and methyltransferase XHV734_3750 (3,868,330…3,884,140 bp). Essential genes or domains are shown in red, non-essential genes or domains in grey, transposases in black in (c), and duplicated loci in blue in (d). Gene names or simplified loci numbers are indicated at the bottom of each box. Green bars indicate the position of TA sites, and golden bars represent the read count at each TA site. In (c), shadowed TA sites indicate unavailability of read counts because of repeated sequences.