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(a) The sequence logo representation of AphA sites (Table 2) was generated by WebLogo [24]. The 20-bp box sequence ATATGCAN6 TGCATAT contained imperfect inverted repeats of ATATGCA with a 6-nt centered spacer. (b) A position frequency matrix describes the alignment of AphA sites, and denotes the frequency of each nucleotide at each position.
