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Branched‐type hydrophilic polyethyleneimine derivatives (i.e., bPEI derivatives) are developed polymeric carriers for photodynamic therapy. Their chemical structures which contain pH‐tunable hydrophobic/hydrophilic cavities enable efficient loading of hydrophobic drugs in basic pH environments. Intracellular stimuli trigger the release of the loaded drugs in bPEI derivatives. As expected, the hydrophobic...
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