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Killing of WT and irr-ihk–knockout GAS strains by human PMNs in suspension (A) or adherent cells (B). *P ≤ 0.02 using a paired 2-tailed t test (Prism 7 for Windows, GraphPad Software, Inc); ns, not significant. Data are presented as the mean ± standard error of the mean of 4 (A) or 6 (B) separate experiments as indicated.
