The researchers believe that the cancer does not take up new mitochondria with every new host, rather that this functions as an occasional repair mechanism to replace faulty mitochondria.

研究人员相信，肿瘤不是在每个新宿主身上都获取新的线粒体，而是用来取代有问题的线粒体的一种偶然的修复机制。

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But Mair, the voice of Radio 4's PM and an occasional Newsnight host, said he had no ambition to permanently take over from Paxman, Marr or the Today programme's John Humphrys.

BBC: Eddie Mair interviews London mayor Boris Johnson

He is also an occasional presenter of Match of the Day, and will host programmes during the BBC's coverage of Euro 2000.

BBC: Ray Stubbs