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It has been reported that high production of proteases and α-hemolysin in the prototype Staphylococcus aureus strain 8325-4 was associated with its σ B deficiency. Here we analyzed one fresh clinical isolate (KS26) and two ancient human isolates (Wood46 and V8) selected for high production of proteases and α-hemolysin. All three strains lacked yellow pigment and showed a low level of expression...
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