Correction for Liberati et al., An ordered, nonredundant library of Pseudomonas aeruginosa strain PA14 transposon insertion mutants

MICROBIOLOGY. For the article “An ordered, nonredundant library of Pseudomonas aeruginosa strain PA14 transposon insertion mutants,” by Nicole T. Liberati, Jonathan M. Urbach, Sachiko Miyata, Daniel G. Lee, Eliana Drenkard, Gang Wu, Jacinto Villanueva, Tao Wei, and Frederick M. Ausubel, which appeared in issue 8, February 21, 2006, of Proc Natl Acad Sci USA (103:2833–2838; first published February 13, 2006; 10.1073/pnas.0511100103), the authors note that on page 2837, left column, beginning on line 10, “Although gacA has been implicated in biofilm formation in PAO1 (37), we observed a very mild PVC-attachment defect for both the PA14NR Set gacA mutant and for a strain carrying a nonpolar deletion of the gacA gene (19),” should instead read: “Although gacA has been implicated in biofilm formation in PAO1 (37), we observed a very mild PVC-attachment defect for both the PA14NR Set gacA mutant and for a strain carrying a transposon insertion in the gacA gene (19, 20, 38).” The related references appear below. This error does not affect the conclusions of the article.