Fig. 2.

The SL sequences of T-boxes from different bacterial species. The PMCs (nucleotide triplet) are underlined or overlined with dots, and their identity is indicated for each SL. The number of nucleotides in each SL is also indicated (detailed in Tables S1 and S2). The listed SLs correspond to T-boxes found upstream of genes or operons implicated in amino acid metabolism (black square), transport (grey circle), and in aminoacyl-tRNA biosynthesis (black circle). The codon displacement represents the changing position of the codon toward the 5′ or the 3′ end of the SL when comparing many T-box SLs.