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Schematic diagram of PSBMA-PAA/PDMAEMA (or PEI)/DNA core–shell polyplexes. Cationic PDMAEMA (or PEI) first interacted with DNA molecules electrostatically. In physical condition, the diblock polymer PSBMA-PAA served as electroneutral shells to protect the polyplexes from biosorption and fell off around tumor cells to expose the positive charges of the core for enhanced cellular uptake.
