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Gold nanoparticles (AuNPs) were used as colorimetric probe and fluorescence quencher for affinity analysis of DNA aptamers toward their target mucin 1 (MUC1) peptide. Single-stranded DNA (ssDNA) aptamer-coated AuNPs showed increased stability (i.e., more resistant to aggregation induced by NaCl) in the presence of their target peptide due to the increase in steric protection conferred by the ssDNA–peptide...
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