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Endothelial cell (EC) adherence (A) and damage (B) and α-toxin activity (zones of clearance on the sheep blood plate; C) among MW2 and RN6390 parental Staphylococcus aureus strains and their respective mgrA mutant and mgrA-complemented strain sets. *P < .001 and **P < .0001 vs their respective parental and mgrA-complemented strains.
