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The M2A is a camera the size of a vitamin pill and developed by the US firm Given Imaging. When swallowed this battery powered device generates 57,000 images as it passes through the stomach and through the intestine. To date it has been used at the Royal Hallamshire Hospital to discover the causes of intestinal bleeding, but its potential to study polyps, tumours and bowel cancer is enormous. At £300 a time it is the ultimate disposable camera!