DNA fragments were resolved on 1-2% agarose gel containing 0.5 )lg/mL ethidium bromide in Tris-Acetate-EDTA (TAE) buffer (40 mM Tris-acetate, 2 mM EDT A, pH 8.1 ). The samples were mixed with 6X loading dye containing bromophenol blue, and the samples were resolved by applying a voltage of -5-7 V/cm. The resolved DNA fragments were visualized under ultraviolet illumination and the relative band size was determined by comparison against a DNA ladder with bands of known sizes. When required, images were acquired using a UVP Gel Documentation system.