After amplification, 10 μL of formamide loading dye (95% Formamide, 0.25% Bromophenol blue and 0.25% Xylene cyanol) was mixed with PCR products for both the markers. The amplification products were separated by electrophoresis in 6% denaturing polyacrylamide gels (Sequi-Gen1 GT Nucleic Acid Electrophoresis Cell, Bio-Rad) at 45 W constant powers for 2 h and visualized by silver staining as described by Benbouza et al. (2006). The band sizes were estimated by comparison with a 10 bp ladder (Invitrogen; Carlsbad, CA, USA). หลังจากขยาย 10 μ l Formamide