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Novel bioreducible poly(amido amine)s containing disulfide linkages were synthesized and evaluated as vectors for protein delivery. These linear polymers could be easily obtained by Michael-type polyaddition of various primary amines to the disulfide-containing cystaminebisacrylamide. The polymers efficiently condense protein into nanoscaled and positively charged complexes that are stable under neutral conditions but rapidly destabilize in a reductive environment. The results indicate that bioreducible poly(amido amine)s have excellent properties as highly potent and nontoxic protein carriers.