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A simple, sensitive and label-free electrochemical sensor is developed for detection of Hg2+ based on the strong and stable T–Hg2+–T mismatches. In the presence of Mg2+, the parallel G-quadruplex structures could be specifically recognized and precipitated in parallel conformation. Therefore, the guanine nanowire was generated on the electrode surface, triggering the electrochemical H2O2-mediated...
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