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Mapping of nth transcription initiation sites by primer extension analysis. (A) Arrows indicate primers used in primer extension analysis. nth20 anneals 88 bp 3′ to the predicted ydgL start codon; nth26 anneals 99 bp 3′ to the predicted ydgK start codon. (B) Primer extension with primer nth26. (C) Primer extension with primer nth20
