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Growth of Pseudomonas fluorescens in relation to concentration of pexiganan. Mean (±s.e.) growth is measured as (a) absorbance before selection and (b) after selection and presents data from positive selection lines and control selection lines for wild-type (SBW25) and mutator (SBW25 Δmuts) genotypes. Note that lineages were not assayed at concentrations above 512 μg ml−1 before selection, since growth was totally inhibited.
