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Multiple alignment of the btuB upstream regions from enterobacteria (A) and some α-proteobacteria (B). Gray background denotes the P0 and P3 stems of the B12-element and the proposed RBS sequestors. Bold black denotes the main stem of the antisequestor. Arrows show the complementary stems of RNA secondary structures. Candidate pseudoknots are underlined and designated Pkn. RBSs and start codons are shown in bold letters.
