Their investigation, just published in Cell, suggests it is the result of a change in the role of a single viral gene, called nef.

他们的调查报告发表在《细胞》杂志上，认为这是一个叫做nef的单独病毒基因的功能发生变异而导致的结果。

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Indeed, of the 16 immunodeficiency viruses the researchers looked at, all but five had nef genes that removed TCR-CD3 from the cell surface.

事实上，在研究人员观察的16种免疫缺陷病毒中，除五种以外，其他十一种都具有各自的nef基因以去除细胞表面的TCR-CD3蛋白。

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Viki Johnson is head of climate change and energy policy at nef (the new economics foundation).

维基·约翰逊，新经济学基金会气候变化与能源政策主管。

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One fear shared by many enthusiasts of renewables, says Andrew Simms, policy director of the NEF, is that the government is simply losing interest in them.

ECONOMIST: Renewable energy

It's amazing because Janica has never been on the podium of a World Cup giant slalom and, on paper, Nef was the favourite, mainly because she was so dominant last season.

BBC: Confidence counts for Kostelic

Solar energy has been the victim of its own success, growing at an annual rate of 254% between 2004 and 2008 according to NEF, creating a mini bubble that was bound to burst.

CNN: The smart money's on green