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Intraduplex interactions involving the 20th residues in the DD1a (a), DD1b (b) and DD2 (c) DNA:DNA duplexes, and the 5th residues in the DR2a (d), DR2b (e) and DR2c (f) DNA:RNA duplexes. The carbon atoms in the aminohexyl, carbamoyl and methoxyl modifications are colored green, and the water molecules are colored pale blue. Broken and dotted lines indicate possible hydrogen bonds and van der Waals interactions, respectively. The values indicated are in angstroms (Å).
