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The deprotonation of ionizable nucleobases centrally placed in short model oligonucleotides was examined under different physical conditions, using UV absorption spectroscopy. The oligonucleotide sequences were designed so that only the central base would be ionized over the pH range examined. pKa values of 9.90±0.01 and 9.34±0.04 were determined for the guanine group in the oligomer d-ACAGCAC and...
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