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Biofilm formation of wild-type PAK strain, PAK-NP (pilA), and PAK-NF (fliC). (A) Bars represent the measure of OD600 as a result of four distinct experiments. The level of attachment of the mutant strains is indicated as a percentage of attachment of the wild-type PAK strain. (B) Visualization of biofilm formation in wells of a microtiter dish after crystal violet staining.
