Cardiff University in Alzheimer's genetic discovery

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A Cardiff University scientist has led a research team which has discovered five new genes that increase the risk of developing Alzheimer's.

The latest discovery doubles the total number of genes identified as risk factors to 10.

It has enabled researchers to identify a series of patterns where they are able to tell there is something different about the responses of people with the brain disease.

Alzheimer's Research UK called it "a step towards defeating dementia".

Prof Julie Williams explains what it means.

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