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Biofilm formation ability of P. luminescens overexpressing dam gene (Dam) and control (MCS5). (A) Biofilms formed in a glass tube after 12 days of incubation in LB medium were stained with crystal-violet. (B) Boxplots of the biofilm-associated crystal violet measured at OD570 nm (see Methods section for details). Difference between the two strains is significant (p < 0.01, Wilcoxon test).
