FIG. 3.

The presence of IVSs in 72 strains of Salmonella subgenus I of the SARB set (6). The relationships of the 72 strains shown on the left as electrophoretic types were determined by MLEE. The Salmonella species and SARB numbers are listed in Table 1. The total numbers of IVS insertions in H25 (helix 25) and H45 (helix 45) in the seven rrl genes for 23S rRNA were determined by PCR to detect IVSs and also by rRNA cleavage; the inferred number of IVSs, which was the same for both methods in all 72 strains, is shown.