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Chemical and genetic complementation. (A) Effect of putrescine on biofilm formation by the mutant strain CP2-1-S1 (speF::TnM). (B) Biofilm formation of the complementation strain CP2-1-S1C (speF::TnM, p15A-speF). The assays were conducted using MM1 medium. Values are means ± standard deviations (n = 12).
