Maps of plasmids and homologous sequences. Same colours indicate homologous genes, operons or genetic elements (mrs, ssi). Larger regions exhibiting more than 85% sequence identity at the DNA level are marked with grey areas or are indicated below the sequence. Nucleotide sequence identities are given in percent. Replication and transfer origins are shown above the DNA when they are located on the sense strand and below if they are placed on the antisense strand. The plasmids pECA1039 and ColE1 as well as parts of the chromosomes from P. luminescens TT01 and E. tasmaniensis Et1/99 are shown for comparison. Abbreviations: DRs, direct repeats; mrs, multimer resolution sites; oriT, origin of transfer; oriV, origin of replication; ssi, single strand initiation site.