FIG. 6.

Alignment of the sequences from the 3′ end of purH to the 5′ end of purD. Only the sequences that flank the SsuDAT1I genes are shown. The 3,503-bp sequences from 53 bp upstream of ssuMA to 5 bp downstream of ssuRB (top) are connected by the lines with the lower sequences flanking the SsuDAT1I region, which are aligned with the corresponding sequences of the strains lacking the R-M system. Strains are indicated to the left of the sequences (NCTC, NCTC10234). Dots, nucleotides identical to those of the aligned sequence of DAT1; dashes, gaps in the aligned sequences; boxes, stop and start codons of the genes appearing in these sequences.