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Relevant regions of the pBR322 derivative expressing SopB(1–323)Gal4 from the IPTG-inducible tac promoter (Upper) and a lacZ reporter plasmid with a p15A replication origin and a cluster of four Gal4-binding sites (UAS)4 about 1 kbp upstream of the Ptet promoter expressing β-galactosidase (Lower).
