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Single-molecule detection (SMD) and single-molecule fluorescence resonance energy transfer (smFRET) were conducted using Cy3- and Cy5-labeled single-strand DNAs (ssDNAs) either immobilized on substrates or encapsulated in microdroplets. High-quality fluorescent images were obtained using a total internal reflection fluorescence microscope (TIRFM). In the substrate system, deposition of a low concentration...
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