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Nature Biotechnology 20, 177–182 (1 February 2002) | doi:10.1038/nbt0202-177

An unnatural base pair for incorporating amino acid analogs into proteins

Ichiro Hirao , Takashi Ohtsuki , Tsuyoshi Fujiwara , Tsuneo Mitsui , Tomoko Yokogawa , Taeko Okuni , Hiroshi Nakayama , Koji Takio , Takashi Yabuki , Takanori Kigawa , Koichiro Kodama , Takashi Yokogawa , Kazuya Nishikawa & Shigeyuki Yokoyama