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Frequency of alkylation of oligonucleotides containing dA, dT, dC, dG. Comparison between duplex 19: d(ATTATTGCTATT).(AATAGCAATAAT) and single stranded oligonucleotide 28: 5’-ATTATTGCTATT and between duplex 20 d(ATTATTCGTATT).(AATACGAATAAT) and single stranded oligonucleotide 29: 5’-ATTATTCGTATT.
