TABLE 1.

Bacterial strains

Strain	Relevant genotype	Source or reference
ZK126	W3110 ΔlacU169 tna-2	27
ZK1142	ZK126 nalR	27
ZK1143	ZK126 strR	27
ZK1058	ZK126 dps::kan	2
ZK1146	ZK126 dps::cam	Kolter laboratory strain
SF2042	ZK1058 pJE106	This study
SF2043	ZK1146 pBR322	This study