PCR was performed in a Veriti 96-well thermal cycler (Applied Biosystems®) for 30 cycles (denaturation for 1 min at 92 °C, annealing for 1 min at 56 °C, and extension for 90 s at 72 °C), with an initial step of 2 min at 96 °C and a final extension of 90 s at 72 °C. Amplicons were simultaneously digested with two restriction enzymes (DdeI and HinfI) as follows: 5 μl of each PCR product was cut with 5 units of each enzyme (New England Biolabs®, Inc., 10 U/μl) in 2.0 μl 10× buffer D, 0.2 μl of acetylated BSA (10 mg/ml) and 11.8 μl of H2O for 3 h at 37 °C. As negative control, PCR products were treated with H2O instead of enzymes. Restriction fragment patterns were analyzed on 2% agarose gel in 0.5 times Tris–acetate– EDTA (TAE) buffer and visualized using ethidium bromide and a BioDoc-It Imaging System (UVP, LLC; Upland, CA).