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. 2016 Aug 1;6:30878. doi: 10.1038/srep30878

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(A) Photographs of AuNPs solutions in the presence of ssDNAs with different lengths. (B) Photographs of AuNPs solutions in the presence of hairpin DNAs with different lengths of ssDNA sticky ends. (C) The absorption spectra of AuNPs in the presence of hairpin DNAs with different lengths of ssDNA sticky ends after NaCl addition. Inset: The absorption spectra of AuNPs in the presence of ssDNAs with different lengths after NaCl addition. (D) Absorbance ratio (A520/A610) showing colorimetric responses of AuNPs solution with ssDNAs and hairpin DNAs.