TABLE 1.

Strains used in this study^a

Species and strain	Description	Reference
P. aeruginosa
PAO1	Wild type	52
PAD07	PVD− PCH−	57
PAD08	PVD+ PCH+ ΔtonB1	57
PAD14	PVD− PCH− ΔtonB1	57
PA0470	PVD+ PCH+ ΔfiuA	29
PA0476	PVD+ PCH+ ΔfiuB	29
PA0478	PVD+ PCH+ ΔfiuC	29
E. coli BW25113entB::Kanr	Ent−	2

^aPA0470, PA0476, and PA0478 were from the comprehensive P. aeruginosa transposon mutant library at the University of Washington Genome Center (29). The location of the mutation was confirmed by PCR with primers flanking the insertion sites. Further information can be found at http://www.genome.washington.edu/UWGC/Pseudomonas/index.cfm.