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Electrophoresis of multiplex polymerase chain reaction (PCR) for detection of PCR products of AmpC enzyme producing gene mediated by plasmid. M, DNA marker (from top to bottom are 1,200, 900, 700, 500, 300 and 100 bp); 1, positive control; 2, negative control; 3–14, Escherichia coli isolated from different clinic.
