FIG. 3.

Determination of levels of expression of mecA (A), blaZ (B), and blaI (C) by TaqMan real-time RT-PCR in parental S. aureus strain 2884 and oxacillin-dependent strain 2884D. Relative values of the amount of specific mRNAs over 16S mRNA are shown on the vertical axis. #, transcription was significantly greater for strain 2884 grown in the presence of oxacillin compared with that seen for the same strain grown in the absence of oxacillin (SA2884+oxa and SA2884, respectively; P < 0.001); *, transcription levels were significantly lower in strain 2884D than in strain 2884D induced with oxacillin (SA2884D and SA2884+oxa, respectively; P < 0.001).