TABLE 1.

Strains used in this study

Strain	Descriptiona	Reference or source
S. aureus
RN6390	Derivative of NCTC8325 that maintains its hemolytic pattern when grown on sheep blood agar, 11-bp deletion in rsbU	33
UAMS-1	Clinical osteomyelitis isolate, rsbU+	17
8325-4	NCTC8325, cured of prophages, 11-bp deletion in rsbU	31
GP269	8325-4 (rsbUVW sigB)+-tetL, Tcr	16
SH1000	Functional rsbU derivative of 8325-4, rsbU+	25
Newman	Clinical isolate (ATCC 25904), rsbU+	10
IK184	Newman ΔrsbUVW sigB, Emr	26
E. coli
XL1-Blue	recA1 endA1 gyrA96 thi-1 hsdR17 supE44 relA1 lac[F′ proAB lacqZΔM15 Tn10 (Tcr)]	Stratagene

^aAbbreviations: Tc^r, tetracycline resistant; Em^r, erythromycin resistant.