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Average numbers of plaques formed in an A549 monolayer by Bp340, the Bp340ΔbcaA strain (A), the Bp340ΔbcaB strain (B), and the respective complementation strains. Assays were performed three times in duplicate, and the results were combined. Data are means ± standard errors of the means (SEM). **, P < 0.0080; ***, P < 0.0001 (by one-way ANOVA with Tukey's posttest at a 95% confidence interval).
