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. 2020 Nov 19;18(9):1324–1338. doi: 10.1080/15476286.2020.1846388

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Figure 1. — The trp operon and the sRNA Ec-rnTrpL in E. coli. (A) The trpLEGDCFBA operon with indicated operators (grey rectangles), transcription start site (flexed arrow) and attenuation terminator (hairpin). The region corresponding to Ec-rnTrpL is indicated. (B) Sequence of the Ec-rnTrpL gene with indicated trpL ORF (start, Trp and stop codons are in bold and underlined) and base pairing regions involved in the regulation of the trp operon by transcription attenuation are marked. (C) Schematic representation of Ec-rnTrpL, which arises by transcription attenuation. Base pairing regions leading to formation of the anti-antiterminator (1 and 2) and the terminator (3 and 4) are indicated. For details, see (B)