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Schematic depiction of the fbfA-fbfB locus and various plasmid constructs. The genes fbfA and fbfB are arranged in a divergent orientation, and the distance between their start codons is 153 bp. The Tn5lacZ insertion in the fbfB gene of the mutant AP182 is 550 bp downstream of the start codon. The insert of pSZ182 is identical to the insert of pBS1 containing Tn5lacZ. E, EcoRI; S, SalI; Sm, SmaI.
