Science (2008) - Comment
pubmed: 18276851  doi: 10.1126/science.1154884  issn: 1095-9203  issn: 0036-8075 

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Takashi Aoi, Kojiro Yae, Masato Nakagawa, Tomoko Ichisaka, Keisuke Okita, Kazutoshi Takahashi, Tsutomu Chiba, Shinya Yamanaka