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Growth of Escherichia coli in relation to concentration of pexiganan. Mean (±s.e.) growth is measured as absorbance (a) before selection and (b) after selection and presents data from positive selection lines and control selection lines for wild-type (PS8) and mutator (PS8 mutL) genotypes. Note that lineages were not assayed at concentrations above 512 μg ml−1 before selection, since growth was totally inhibited.
