TABLE 1.

Control strains

Group	Strain	Organism	AmpCa	Reference or sourceb
Plasmid mediated	MISC 340	Klebsiella pneumoniae	FOX-1	15
	MISC 393	Escherichia coli	FOX-3	21
	MISC 416	Escherichia coli	FOX-4	4
	MHM 2	Klebsiella pneumoniae	FOX-5c	27
	COUD M 621	Klebsiella pneumoniae	FOX-5bc	GenBank accession no. AY034843
	MISC 341	Klebsiella pneumoniae	LAT-1	38
	MISC 368	Escherichia coli	LAT-2	11
	KLEB 249	Klebsiella pneumoniae	CMY-2c	3
	SAL 100	Salmonella typhimurium	CMY-7c	GenBank accession no. AJ011291
	MISC 345	Escherichia coli	BIL-1	10
	MISC 339	Klebsiella pneumoniae	MOX-1	19
	MISC 380	Escherichia coli	DHA-1	1
	MISC 304	Klebsiella pneumoniae	MIR-1	25
	KLEB 225	Klebsiella pneumoniae	ACT-1c	5
Chromosomal	JW3	Hafnia alvei	WT	PC
	ENTB 7	Enterobacter cloacae	WT	SEQ
	GB 52	Citrobacter spp.	DR	PC
	21	Citrobacter freundii	WT	SEQ
	316	Citrobacter freundii	WT	PC
	VA 076	Citrobacter freundii	WT	PC
	CA 113	Citrobacter freundii	WT	PC
	CIN 6	Pseudomonas aeruginosa	WT	SEQ
	SERR 1	Serratia marcescens	WT	SEQ
	MORG 103	Morganella morganii	WT	PC
	HB101	Escherichia coli	WT	PC
	KLEB 23	Klebsiella pneumoniae	WT	PC
	VITEK 109492	Escherichia coli	HYP	PC
	P2	Proteus mirabilis	WT	PC
	EAE	Enterobacter aerogenes	WT	PC

^aWT, wild type; DR, derepressed mutant; HYP, hyperproducing mutant.

^bPC, phenotypically characterized in this study; SEQ, sequenced in the Hanson Laboratory.

^cSequenced in the Hanson laboratory.