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EUO represses late, but not early or mid promoters. Transcription templates containing the promoter regions of early (dnaK), mid (cdsC) and late (ltuB, cdsU and scc2) were transcribed with E. coli RNA polymerase in the absence or presence of 2.5 μM EUO. Additional early, mid and late promoters were tested, and the results are shown in Table 1.
