Long DRs, containing IRs, flank regions A and B of plasmid pSB102. (A) The nucleotide sequences of the two 39 bp IRs (IRreg.A and IRreg.B) are given in forward and reverse direction for left and right hand repeats, repectively. (B) Schematic representation of 460 and 301 bp DRs, which contain the left and right hand arms of the 39 bp IRs, respectively. The two pairs of 39 bp IRs are indicated by black arrows. The 460 bp imperfect DR (DR1) is shown as light grey rectangles, the 301 bp DR (DR2) is shown as dark grey rectangles. Region A encompasses nt 3492–7317 of plasmid pSB102 and region B encompasses nt 37587–43160.