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The modified nucleosides 4-thio-2-deoxyuridine (s4dU) and 4-thio-2-deoxythymidine (s4dT) are incorporated into dinucleosides, and s4dT is incorporated into a DNA hairpin loop to provide divalent metal ion binding sites. Binding of two different metal ions to these sites is studied, including Cd(II) as an NMR spectroscopy probe and Cu(II) as a reactive metal ion for DNA cleavage. Binding of Cd(II)...
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