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Surface-shielded DNA delivery systems have been synthesized with virus-like characteristics that target gene expression into distant tumor tissues. Polyethylenimine (PEI)/DNA complexes ('polyplexes') conjugated with the cell-binding ligand transferrin (Tf) or epidermal growth factor (EGF) were used to achieve receptor-mediated endocytosis. The surface charge of the complexes was masked by covalently...
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