MAIL ONLINE: From the switch that stops you growing to the 'secret police force' hunting out killers: The body's mind-boggling magic that keeps you alive

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Professor Dan Davis, a biologist at the University of Manchester who specialises in natural killer cells, told us: ‘Viruses act like a gang of criminals pulling the blinds down in their hideaway, so no one can see that they’re there. But the NK cells have evolved to simply kill cells with the blinds down.’