Solutions containing 35–70% denaturant [100% denaturant contains 7 M urea and 40% (v/v) formamide] were used for bacteria, and solutions containing 30–60% denaturant were used for yeast. The gels were run at 60 °C for 6 h at a constant voltage of 120 V. After electrophoresis, the gels were stained with SYBR-Green I solution (Molecular Probes, Eugene, UK) (1:10,000 v/v) for 30 min, and the images were visualized and photographed with a transluminator LPix Image (LTB 20 × 20HE, LPix®, Brazil)