Oligonucleotides used in this study.

The bold faced are the endonuclease recognition sequences. The underlined are the 2′-OMeN modified nucleotides, and letter p represents the phosphothioate modification. For simplicity, only the template sequences of endonucleases PstI, XhoI, XbaI, SpeI and SphI are listed, and the modified sequences were not included.