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Gel electrophoresis characterization of the prepared cytosensor: Capture probe (T1, Lane 1); aptamer (T2, Lane 2); signal probe (T3, Lane 3); capture probe (T1) plus aptamer (T2) incubated for 2 h at 37 °C (Lane 4); after Capture probe (T1) hybridized with signal probe (T3), aptamer (T2) was added (Lane 5).
