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Φ(nasR-lacZ) fusion constructs (drawn to scale). The ςN-dependent promoter is indicated by a small solid box, and the transcription initiation site is indicated by an arrow. Upstream and downstream endpoints for each construct are indicated in brackets. The lacZY genes are not to scale. Restriction sites: B, BamHI; H, HindIII; M/N, SmaI-NruI fusion; X, XbaI.
