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Nitric oxide (NO),known as an atmospheric pollutant and a potential health hazard,is recognized as an endothelium-derived relaxing factor (EDRF) and a broad-spectrum biological signaling molecule operating at both systemic and specific cellular levels [1-3].Herein,novel nitric oxide (NO)-responsive monomers (NAPMA and APUEMA),containing o-phenylenediamine functional groups,have been polymerized to form NO responsive macromolecular chains as truly biomimetic polymers.