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MicroRNAs (miRNAs) are desirable targets for the diagnosis, prognosis and treatment of diverse human diseases. In this study, we developed a universal and enzyme-free signal amplification approach for the quick, sensitive and specific electrochemical detection of diverse miRNAs from tumor cells using a catalyzed hairpin assembly (CHA) and the DNA three-way junction (DNA TWJ). The target miRNA, which was formed as an initiator through specific recognition, periodically triggered the assembly of two hairpins into a duplex via CHA. Subsequen
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