SMOX and cystic fibrosis: Since a similar behavior among the different P. aeruginosa strains was detected within adenocarcinomic A549 cells, it is possible that the CF isolates PAET1, PAET2, and PAET4 encode similar mutations and have other similarities in their genome that favor their persistence within the bronchial epithelium that could be lacking in the PAO1 or PA14 genomes.