A gene variant called APOE4 is the biggest genetic risk factor for Alzheimer's disease. Scientists are finally figuring out how it works.

Source: [Live Science](https://www.livescience.com/health/alzheimers-dementia/a-gene-variant-triples-the-risk-of-getting-alzheimers-disease-fat-buildup-in-brain-cells-may-be-to-blame-study-finds)

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