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The idea that something is nothing but its component parts and can be explained simply in terms of them, e.g. that humans are ‘nothing but’ a collection of physical components.
Also referred to as amyloid-β (abbreviated to Aβ). It is a peptide derived from the larger amyloid precursor protein (APP) and is the principal component of amyloid fibrils. The specific role of β-amyloid is unclear, but it is thought that amyloid deposits may cause neurons to degenerate. Amyloid deposits also occur in the brains of older Down’s syndrome patients.