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Calibration curve of the hybridization chain reaction–chemiluminescence (HCR-CL) system. (a) Standard solution of miR-let7a; (b) Standard solution of miR-146b. ΔCL represents the CL intensity of the target miRNA subtracted from that of the blank (error bars: SD, n = 3). The orange dots represent the minimum detected amount of the target miRNA.
