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The fluorescence enhanced with increasing the methylated DNA concentration with a linear relation in the range of 1.0 × 10-8 M to 5.0 × 10-7 M with the detection limit of 8.2 × 10-9 M, and quenched with non-methylated ones. The method was very specific in the presence of non-complementary sequences with maximum similarity of 40%. Circular dichroism spectra indicated that silver ions significantly affected the structure of methylated and non-methylated DNA into different extents which could further influence the nanocluster fluorescence.
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