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The DNAzyme-catalyzed cleavage of substrate strand is accompanied by the release of numerous UCNPs from MBs. By measuring the fluorescent signal of released UCNPs after the magnetic separation, target miRNA-21 can be detected by the DDMAL system in a linear range from 1.0 fM to 10 nM, with a limit of detection (LOD) of 0.62 fM (3σ). Moreover, the practicability of DDMAL system was demonstrated by using it to evaluate the expression levels of miRNA-21 in cell lines and assay miRNA-21 in human serum.A new approach to the quantitative anal
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