The PCR reactions primed by the newly designed primer were performed with an initial denaturation step of 5min at 95 °C; following by 35 cycles of; denaturation at 95 °C for 30 s, annealing at 57 °C for 30 s and extension at 72 °C for 1 min; and completed with a final extension at 72 °C for 5 min. The PCR products were electrophoresed on 1.5% agarose gel and stained with ethidium bromide. Then they were eluted from the gel and purified. The purified PCR products were subsequently cloned into pGEM-T Easy vector (Promega) using the ligation reaction containing 0.5 μl pGEM-T Easy vector, 5 μl insert gene (PCR product purified), 2.5 μl 1X ligation buffer and 1 μl T4 ligase incubated at 4 °C overnight.