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Transcription profile of the B. subtilis infC operon. (A) Determination of the transcription initiation start point by extension of primer HP667; the +1 guanosine residue is underlined, the sequence ladder was generated with oligonucleotide HP667. (B) Northern analysis of infC operon transcripts with a probe spanning the four genes. (C) −35 and −10 promoter sequences upstream of the transcription start point which is underlined. (D) Schematic view of the infC operon transcripts.
