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Measurements of crystal violet staining of biofilms formed on PVC plastic by O157:H7 strain 86-24 and its mutant derivatives (gray bars) and by K-12 strain ER2267 and its mutant derivatives (black bars). Numbers shown are the means of the results of at least three separate experiments. Error bars indicate standard errors of the means. The reduction in biofilm formation in the pgaC, yhjO, and wcaD mutants of ER2267 is significant at a P value of <0.05. OD 570, optical density at 570 nm.
