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Effects of agr allele on virulence gene promoters. S. aureus cells of the 8325-4 (A, C, E, G) or Newman (B, D, F, H) background containing the indicated agr allele and transcriptional fusion of the spa (A, B), hla (C, D), lukSF-PV (E, F), or tst (G, H) promoters to the blaZ reporter were tested for β-lactamase activity. Assay data are presented as in Fig. 2.
