Survival of CipS
P. aeruginosa strains 06397 (A), ML43 (B), and ML121 (C) and CipR–PA strains 06161 (D), 05038 (E), and ML172 (F) isolated from patient sputum was measured after exposure to Crp-4, RTD-1, and HNPs. In contrast to Crp-4 and RTD-1, 60 µM HNPs had little bactericidal effects against P. aeruginosa, irrespective of CipR. RTD-1 and HNPs assays were performed in triplicate, Crp-4 activity, assayed once at each peptide concentration, was consistent with Fig. 3 Error bars denote standard deviations from the mean.