FIG. 2.
Secondary structure of the rrnE ISR of S. enterica LT2 based on the model suggested by Brosius et al. (6). Variable positions in the S. enterica strains studied are indicated by circles. Block substitutions and insertions are boxed. B and C boxes show alternative sequences found in some operons and strains and putative secondary structures. The ends of the 16S and 23S rRNAs and tRNA genes are shaded. RNase III cutting sites are indicated (RIII). Dashed arrows indicate pairs of direct repeats.