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XylE assay for usp2 promoter activity. S. aureus containing a promoterless xylE construct (xylE) or xylE downstream of the usp2 promoter (usp2-xylE) were grown to the indicated growth phases and specific XylE activity was determined. The data presented are the average of three independent experiments, each one performed in triplicate, and the error bars represent the standard error. Student’s t test was used to calculate p values.
