The mixture was then incubated at 37°C for 5 h. The reaction was
stopped by incubating at 65°C for 10 min and diluting 10 times in 0.1X TE (1 mM Tris-HCl,
0.1 mM EDTA, pH 8) for polymerase chain reaction (PCR) amplification. The second reaction
was carried out as above, except that HpaII (Fermentas) was used instead of MspI. The
pre-selective amplification reaction was performed using 2 μL diluted digestion/ligation reactions,
in 25 μL PCR mixture containing 200 mM Tris-HCl, pH 8.4, 500 mM KCl