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Electrophoretic analysis of the PCR amplicons for the uidA gene of E. coli. The box indicates the 250-bp product (uidA). 1, Negative control (NC); M, DNA size marker; 2, wild type uidA gene; 3, mutant type uidA gene; 4 mixed sample with 10% wild type uidA gene; 5, mixed sample with 50% wild type uidA gene.
