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(A) Dependence of Ret on the concentration ratio of the tripeptide to AuNPs. The final concentration of AuNPs was 1.8 nM and that of the peptide varied from 0 to 0.75 μM (0, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.75 μM); (B) Dependence of Ret on the AuNPs concentration. The concentration ratio of the tripeptide to AuNPs kept at 167.
