Alzheimer's clues from the distant past

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Protein fragments extracted from a 2,600-year-old brain have given scientists clues about what to look for when identifying serious brain disease. Neurologist Axel Petzold took just half an hour to find the proteins but then spent 11 years analysing them. (Image: An Iron Age brain. Credit: Ching-Hua Lu, UCL Institute of Neurology.)