Table 2.

E. coli strains used in this study.

Strain	Genotype	Reference or source
BW25113	Wild type, rrnB3 ∆lacZ4787 hsdR514 ∆(araBAD)567 ∆(rhaBAD)568 rph-1	38
JW3909	BW25113 ∆metJ::Kmr	38