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Invasion of INT407 cells by strain 81-176 and isogenic LOS mutants. Invasion assays were performed as described in Materials and Methods using water to lyse the monolayers. The data are the means and standard deviations of four to nine independent experiments done in duplicate. The only mutant that showed a statistically significant difference from wild-type strain 81-176 (wt) was the waaC mutant (P < 0.05).
