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Variable positions in the rrl genes of E. coli K-12 and other strains used in this study. Periods indicate the same nucleotide composition as the rrlA sequence of E. coli K-12 (Escherichia coli Database Collection). The numbers at the top indicate positions in the sequences reported by Brosius et al. (3). Insertion of nucleotides G and C between positions 545 and 546 is indicated by the arrow.
