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Characterization of the synthesized novel redox-responsive hyperbranched poly(amido amine) (named PCD): (A) proton nuclear magnetic resonance spectrum of PCD, (B) acid-base titration curves of PCD and polyethylenimine (PEI), (C) cytotoxicity of PCD and PEI on MCF-7 human breast cancer cells, and (D) cytotoxicity of PCD and PEI on MDA-MB-231 human breast cancer cells.
