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Recently,a substantial number of studies focused on gene therapy and nonviral gene delivery vectors [1,2].The REDV sequence is one of the main recognition sites for integrin a4βl binding,which leads to specific interaction between fibronectin and endothelial cells.Herein,a REDV-linked triblock copolymer poly(ethylene glycol)-b-poly(lactide-co-glycolide)-b-poly(ethylene imine) was synthesized via an amidation reaction.