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Polyurethanes (PUs) are a class of biodegradable polymers that have been applied as tissue-engineering materials with minimum toxicity. In our study, a new series of cationic PUs containing tertiary amines in the backbone and primary, secondary and tertiary amines in the side chains (PU1, PU2 and PU3, respectively) was synthesized and used as nonviral vectors for gene delivery. In addition, we introduced...