For restriction fragment length polymorphism analysis (RFLP) an aliquot
of 9 μl of the ehxA PCR products were digested with 5 U of TaqI
restriction enzyme (Invitrogen Life Technologies) and 1.1 μl 10×restriction
enzyme buffer followed by incubation at 65 °C for 90 min. The
digestion mixture was then subjected to DNA electrophoresis on precast
2% agarose gel containing ethidium bromide (E-Gel®, Invitrogen