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Mature biofilms of P. fluorescens SBW25ΔviscA complemented with purified viscosin at concentrations of 0 and 50 μg ml− 1. Biofilms were quantified after 9.5 h of incubation with and without viscosin by the crystal violet assay. Data represent mean ± sd for a representative dataset including eight replicates. *Significant difference (P < 0.05) compared with the control (0 μg ml− 1).
