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Lane M: 100 bp DNA marker (Fermentas, Germany); Lane 1: positive control of amplified 532-bp DNA (S. aureus ATCC 33591); Lane 2: negative control (reaction mixture without DNA); Lanes 3 - 6: representative S. aureus nasal isolates negative for mecA; Lane 7: the only S. aureus isolate positive for the mecA gene.
