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A 2% (w/v) agarose gel image showing uidA gene fragments amplified from all E. coli isolates and E. coli (ATCC 25922) control strain. Lane M = 100 bp DNA Ladder, Lane 1 = uidA gene fragments amplified from E. coli (ATCC 25922) control strain, Lanes 2–28 = uidA gene fragments amplified from E. coli isolates from cattle faeces and beef samples.
