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(a) Schematic illustration of the AgNC-based miR-21 assay. (b) Fluorescence emission spectra of probe Y-templated AgNCs for the detection of miR-21 (0, 10, 30, 50, 70, and 100 nM). (c) Calibration plot reflecting the relationship between the logarithmic ratio of fluorescence peaks and miR-21 concentration. (d) Selectivity investigation of the miR-21 assay.
