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PCR-restriction fragment length polymorphism patterns obtained after digestion with RsaI in C. coli strains. Lanes: M, 25-bp DNA Ladder (Bioline); 1, undigested PCR product of gyrA gene; 2, negative control; 3 to 5, ciprofloxacin-resistant strains; 6 to 11, ciprofloxacin-sensitive strains.
