Shaded boxed regions possess over 99% nucleotide sequence identity with pSSTET1. All sequences of dso, sso containing RSB, and oriT containing RSA identified in this study are indicated with red vertical lines. Abbreviations: oriT, origin of transfer; sso, single-stranded origin of replication; dso, double-stranded origin of replication; tetK, tetracycline resistance gene; lnuA, lincomycin resistance gene; ermC, erythromycin resistance gene; pre, plasmid recombination enzyme gene; rep, replication protein gene; repC, truncated replication protein gene; rep_1, replication protein gene; repL, plasmid replication protein gene; tnp, IS431 transposase gene; IS6, IS6 family transposase gene; and HP, hypothetical protein gene.