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Purpose To establish and characterize a gene delivery system based on PEGylated poly (2-(dimethylamino)ethyl methacrylate) (PEG-PDMAEMA) decorated with phage-displayed TGN peptide (targeting to the blood-brain barrier) and QSH peptide (targeting to Aβ42) to achieve enhanced and precise targeted delivery to amyloid plaques in the brains, which were the hallmark of Alzheimer's disease (AD).