Putative bacitracin synthesis clusters located in putative conjugative transposon in the different position of S. mutans UA159 and NN2025 genome. Putative bacitracin synthesis clusters in S. mutans UA159 (a) and S. mutans NN2025 (b, c). The ORFs colors indicate the BLAST classification as shown in Figure 1. The BLASTP analysis was carried out across a non-redundant protein database in GenBank. The pink areas indicate the specific regions in each strain. Black dotted lines indicate orthologous genes that are located in identical relative positions or that are located in the inverted chromosomal regions. The whole gene list of these regions for each strain is shown in additional files 2 and 3.