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Sequence of wild-type SoxR from E. coli and location of mutations that result in transcriptionally defective SoxR variant proteins. The sequence of the E. coli SoxR polypeptide is shown along with predicted secondary structure elements (see Materials and Methods) depicted above the sequence. Bars represent α helices. Also shown (below the sequence) are locations of mutations that gave rise to a transcription defect. Δ represents a nonsense mutation at position 64.
