The first solid evidence implicating stem cells in cancer came in the early 1990s when John Dick, a stem cell researcher at the University of Toronto, developed a method for transplanting cancerous human bone marrow cells into mice.

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Oh, I am not going to jump on the Apple-is-losing-its-edge bandwagon or make some obscure connection between its recent stock price fluctuations to some fatal shift in its corporate or supply chain performance (and those rumors around the reductions in orders for iPhone screens, if true, probably stem from a solid reason like a change in product strategy).

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This new approach may stem, in part, from Mr Ecevit's belated realisation that Turkey's most solid friend is the United States.

ECONOMIST: Bulent Ecevit, Turkey��s survivor