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Relative impact of agr and xerC on biofilm formation. Biofilm formation was assessed in UAMS-1 (top), LAC (bottom), and their isogenic sarA, agr, xerC, and agr/xerC mutants. *, a statistically significant difference relative to the result for the isogenic parent strain; **, a statistically significant difference by comparison to the result for the isogenic agr mutant. Permutation-based ANOVA models were used to perform these analyses.
