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PG-mediated microbial biofilm. Biofilm formation was evaluated in (A) Staphylococcus epidermidis, (B) Escherichia coli, (C) Klebsiella oxytoca, and (D) Citrobacter freundii calculating the % of bacterial surface coverage from phase-contrast images. Data are presented as mean ± SEM. Unpaired t-test. **** p < 0.0001. n = 3/group.
