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Alzheimer's research in 'major step' towards blood test

8 July 2014 Last updated at 22:11 BST

British scientists say they have made a major step forward in developing a blood test to predict the onset of Alzheimer's disease.

Research in more than 1,000 people has identified a set of proteins in the blood which can predict the start of dementia with 87% accuracy.

Hugh Pym reports.