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(A) Schematic illustrations of the DNA nanopore structure with a valve (57). Fluorophore carboxy-fluorescein (CF, red) and sulpho-rhodamine B (SRB, green) are self-quenched molecules. (B) Fluorescence signals of CF and SRB for vesicles with open valves. (C) Schematic illustration of the DNA nanopore's recognition and endocytosis of a tumor cell (124).
