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Nucleotide sequence of the B. subtilis trp leader transcript showing the 5′ stem-loop and the mutually exclusive antiterminator and terminator structures. Boxed nucleotides mark overlapping segments of the competing secondary structures. The (G/U)AG repeats known to be involved in TRAP-RNA recognition are boldfaced. Numbering is from the start of transcription. RNA secondary-structure predictions were performed by using MFOLD (40, 43).
