Multiple alignment of T-box structures upstream of the ileS genes. a) Coordinates and protein identifiers of the ileS genes. b) Nucleotide alignment of the 5' untranslated regions. T-box hairpins are underlined and T-box sequences are set in capitals. The sequestor hairpin is shaded in grey. Candidate Shine-Dalgarno boxes are set on capitals. Anti-sequestor hairpins are set in bold.