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S. aureus fnbA promoter expression in vegetation, kidney, and spleen during the course of experimental endocarditis. (A) Percent GFP-positive S. aureus cells in vegetations at 8 and 48 h infection. (B) Percent GFP-positive S. aureus cells in kidney and spleen at 48 h infection. Symbols: □, parental strain; ▥, agr mutant; ▩, sarA mutant; ▪, sarA agr double mutant.
