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. 2011 Dec 22;40(8):3299–3306. doi: 10.1093/nar/gkr1225

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© The Author(s) 2011. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — The frequency distributions of the intermolecular hydrogen bonds that are formed between the amino acid moiety (the main chain or one of 20 side chains) and the nucleotide moiety (the ribose, phosphate or base) at the following six types of interfaces: (a) dented surface and unpaired nucleotides, (b) dented surface and paired nucleotides, (c) intermediate surface and unpaired nucleotides, (d) intermediate surface and paired nucleotides, (e) protruded surface and unpaired nucleotides and (f) protruded surface and paired nucleotides. The black, gray and white bars represent the ribose, phosphate and base moieties, respectively.