TABLE 1.

Bacterial strains

Strain	Genotype	Reference(s) or source
MG1655	Wild type	4
MGΔZB	MG1655 lacΔ145	42
CAG4000	MG1655 ΔlacX74	D. J. Jin and C. Gross
RJ1617	MC1000 fis::kan767	22
CAG18500	MG1655 thi-39::Tn10	42
RLG3381	MG1655 thi-39::Tn10 rpoCΔ215–220	7
RLG1829	MG1655 λ rrnB P1 (−88 to +50)-lacZ	3, 17
RLG1785	MGΔZB λ rrnB P1 (−154 to +50)-lacZ	8, 17
RLG1679	CAG4000 λ rrnB P1 (−88 to −37)-lac (−36 to +57)–lacZ	3, 16
RLG1680	CAG4000 λ rrnB P1 (−88 to −37 Δ-72)-lac (−36 to +57)–lacZ	16, 34
RLG3950	CAG18500 λ rrnB P1 (−61 to +50)-lacZ	7, 37
RLG3993	RLG1829 thi-39::Tn10	This work
RLG3398	CAG18500 λ rrnB P1 (−154 to +50)-lacZ	17; this work
RLG3951	RLG3381 λ rrnB P1 (−61 to +50)-lacZ	7, 37
RLG3994	RLG1829 thi-39::Tn10 rpoC Δ215–220	This work
RLG3399	RLG3381 λ rrnB P1 (−154 to +50)-lacZ	17; This work
RLG4076	RLG1784 thi-39::Tn10 rpoBRH454	7
RLG4329	RLG1785 thi-39::Tn10 rpoBRH454	This work
RLG3974	RLG3398 fis::kan-767	This work
RLG3971	RLG3399 fis::kan-767	This work
RLG3979	RLG1680 thi-39::Tn10	This work
RLG3977	RLG1679 thi-39::Tn10	This work
RLG3980	RLG1680 thi-39::Tn10 rpoCΔ215–220	This work
RLG3978	RLG1679 thi-39::Tn10 rpoCΔ215–220	This work
RLG1784	MGΔZB λ rrnB P1 (−61 to +50)-lacZ	9, 17
RLG3982	RLG1784 thi-39::Tn10 rpoCΔ215–220	7