Chameleon-like nanoparticles of gold can be used to indicate the presence of various biomolecules. Adding aptamers — DNA strands that bind only to specific molecules — to the mix opens up further possibilities.
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Famulok, M., Mayer, G. Aptamers in nanoland. Nature 439, 667–669 (2006). https://doi.org/10.1038/439666a
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DOI: https://doi.org/10.1038/439666a
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