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Stern–Volmer plot for the quenching of the PHEO–CARBOQ exciplex fluorescence by double-stranded oligonucleotides. Fluorescence was obtained from the area of the integrated spectrum. Pheophorbide-a (PHEO) and carboquone (CARBOQ) concentrations are 1.8 × 10−5 M and 2.3 × 10−5 M, respectively.
