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Schematic illustration of the sandwich hybridization assay with a QD-induced FRET reporter system for H5 target DNA detection: (a) sandwich hybridization with label-free H5 sequence (target) by the capturing probes conjugated on QD655 (FRET donor) and the reporter probes labeled with Alexa Fluor 660 (FRET acceptor); (b) FRET emission shift before and after the sandwich hybridization.
