Alignment of genes involved in thiamine biosynthesis ( thiOSGF ), a toxin-antitoxin system ( stbDE ) and a choline transporter ( betT ) for E. tasmaniensis , and E. pyrifoliae. The maps show corresponding parts from the chromosome of E. tasmaniensis strain Et1/99 and from plasmid pEP36 of E. pyrifoliae strain Ep1/96. BlastP results (percentage identity) are shown for related genes (grey boxes). Labels indicating the locus tag number are given within the grey boxes, if no gene name is assigned. White boxes indicate genes without similarity. The proteins for thiamine biosynthesis (thi) and the flanking regions are highly related and the genes are in conserved order. The stbD and stbE genes of pEp36 encode for a toxin-antitoxin system. A comparison for genes in this region was done before for the E. amylovora plasmid pEA29, the E. pyrifoliae plasmid pEP36 and plasmid pEJ30 from the Japanese E. pyrifoliae strain Ejp557 . Locus tags of the genes are abbreviated for this overview.