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Induction of rsfA-lacZ in vegetative cells producing ςF or ςG. Strains 1229 (▵, ▴ [producing ςF under Pspac control]), 1230 (□, ■ [producing ςG under Pspac control]), and BFA1335 (○, ● [an isogenic strain without the Pspac construct]) were grown in 2× TY, and samples from cultures with (solid symbols) or without (open symbols) IPTG were taken for assay of β-galactosidase activity.
