Gene sequence comparison between early and late <i>P. aeruginosa</i> isolates from CF patients.

*Strains were collected at the onset of chronic colonization (numbered 1–2 per patient) or after 4–18 years of chronic airway colonization (numbered 43–73) [5][1].菌株采集分为两类：一类采集于慢性定植发生初期，每名患者采集1~2株，对应菌株编号范围为1~2；另一类采集于慢性气道定植持续4~18年后，对应菌株编号范围为43~73[5][1]。