Chimeric Embryos May Soon Get Their Day in the Sun

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Science  28 Jun 2013:
Vol. 340, Issue 6140, pp. 1509-1510
DOI: 10.1126/science.340.6140.1509

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Japanese stem cell biologist Hiromitsu Nakauchi is pioneering a technique that ultimately aims to implant human pluripotent cells into pig embryos to create replacement human tissues and organs. Japan has taken a step toward lifting a ban on such research using human cells. However, as a result of delays in the approvals process for the ethically fraught research, Nakauchi plans to move his experiments to California.