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'Significant step' in Alzheimer's disease DNA research

28 October 2013 Last updated at 09:45 GMT

Scientists from Wales have helped develop a clearer picture of what causes Alzheimer's disease after the largest ever analysis of patients' DNA.

It has been described as a "major breakthrough" in the understanding of the disease.

It is hoped that the research, jointly led by a team at Cardiff University, will pave the way for new treatments.

Prof Julie Williams, from Cardiff University, explained what the findings mean.

Alzheimer's insight from DNA study