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Steady-state mRNA levels of sigB, rsbU, and asp23 genes (A) or hla and spA genes (B) of strains 14-4 and 14-4rev compared to those of parent strain MRGR3, determined by real-time RT-PCR and normalized on the basis of adjusted 16S rRNA levels. Values are the mean + SEMs of three experiments performed in triplicate. *, values significantly different (P < 0.01) from those for MRGR3.
