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Agarose gel electrophoresis analysis showing PCR amplification products for the fnbB gene of S. aureus. Lanes: MP, DNA molecular size markers; 1 and 2, fnbB-positive isolates 774 and 196; 3, fnbB variant (teat orifice isolate); 4, fnbB-positive control CCUG 47326; and 5, negative control.
