Current Biology (2007) - Comment
pubmed: 17980593  doi: 10.1016/j.cub.2007.10.039  issn: 0960-9822 

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Fernando D. Camargo, Sumita Gokhale, Jonathan B. Johnnidis, Dongdong Fu, George W. Bell, Rudolf Jaenisch, Thijn R. Brummelkamp