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In this paper, we report a “signal-on” electrochemical aptasensor for simultaneous determination of two tumor markers MUC1 and VEGF 165 , by using a ferrocene-labeled aptamer-complementary DNA (cDNA) as probe. Since the cDNA immobilized on an electrode surface can hybridize with both MUC1 aptamer and VEGF 165 aptamer to form a long double strand with ferrocene far away from the electrode...
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