Fig. 2From: Frequency of quinolone resistance genes among extended-spectrum β-lactamase (ESBL)-producing Escherichia coli strains isolated from urinary tract infectionsAgarose gel electrophoresis of qnrA (580 bp), qnrB (264 bp), and qnrS (428 bp) genes of multiplex PCR amplification products. Left to right lane: lane 1 negative control; lanes 6, 7, and 8 positive control for qnrS, qnrB, and qnrA, respectively; lane 2 qnrA and B; lane 3 qnrS and B; lane 4 qnrA and S; lane 9 100 bp DNA ladderBack to article page