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Non-additivity of base-base interactions in all ten possible model dinucleotide steps were analyzed on MP2/aug-cc-pvDZ quantum chemistry level. Conformations of four nucleobases exactly matched to ones occurring in B-DNA crystals. In most of thw 162 analyzed tetramers both three- and four-body contributions are negligible except for d(GpG) steps. However, in these dinucleotides both contributions...
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