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The resistance of evolved PAO1 (light grey) and lasR (dark grey) strains to ancestral and coevolved phages measured at the end of the experiment. Competition treatment shows the absence and presence of competitors during the selection experiment. Only populations that had evolved in the presence of phage were used for the analysis; all P. aeruginosa populations that had evolved in the absence of phage were susceptible to phages. All bars show ±1 SEM
