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In this paper, we establish a novel fluorescence-sensing system for the detection of biotin based on the interaction between DNA and graphene oxide and on protection of the terminal of the biotinylated single-stranded DNA fluorescent probe by streptavidin. In this system, streptavidin binds to the biotinylated DNA, which protects the DNA from hydrolysis by exonuclease I. The streptavidin–DNA conjugate...
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