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Biofilm formation by P. fluorescens wild type (07A and 041) and transconjugant (07A-2 and 041-3) strains in ABC medium after incubation for 48 h at 25 °C, in polystyrene microtiter plates using crystal violet staining, and quantified based on the difference between the absorbance at 570 nm. Values are means ± standard errors (n = 5).
