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A drug that acts 'like a ninja' could stop the progression of Alzheimer's without creating side-effects.
Researchers are developing the medication that stops beta amyloid protein in the brain from grouping into plaques -- one of the key reasons for Alzheimer's disease. 
Early results suggest the drug -- known as PMN310 -- is more effective at stopping the spread of these toxic groups than other drugs getting trialled as Alzheimer's treatments.
Tests on mice also available it prevented short-term memory damage and may even change symptoms.
Around 850, 500 people in the UK have dementia and over 60 per cent of those have Alzheimer's disease.
In Alzheimer's, proteins build up within the mind developing either plaques -- triggered by beta amyloid -- or tangles: both destroy nerve cells and harm the brain.