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Schematic depicting folic acid‐tagged DNA nanowire for imaging miRNA inside the cell. The DNA nanowire was made of a string of hairpin probes bearing a dye‐quencher pair. In the OFF state, the fluorescence was quenched within the stem‐loop of the DNA hairpins, which opened in response to target cellular miRNA and created an amplified fluorescence signal. Reproduced with permission.131 Copyright 2018, American Chemical Society.
