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Thiolated nucleic acid hairpin nanostructures that include in their stem region a “caged” G‐quadruplex sequence, and in their single‐stranded loop region oligonucleotide recognition sequences for DNA, adenosine monophosphate (AMP), or Hg2+ ions were linked to bare Au surfaces or to Au nanoparticles (NPs) linked to Au surfaces. The opening of the hairpin nanostructures associated with the bare Au surface...
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