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8-(Pyren-1-yl)-2′-deoxyguanosine (Py-G) was incorporated synthetically as a modified DNA base and optical probe into oligonucleotides. A variety of Py-G-modified DNA duplexes have been investigated by methods of optical spectroscopy. The DNA duplex hybridization can be observed by both fluorescence and absorption spectroscopy since the Py-G group exhibits altered properties in single strands versus...
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