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. 2016 Dec 23;10(Suppl 4):112. doi: 10.1186/s12918-016-0351-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Residue composition and RIR of different amino acids. The x-axis is residue types ordered based on chemical properties (basic:H-K, hydrophobic:A-W, polar:Y-Q and acidic:D-E) and aromatic residues (P-Y) in together. In each chemical property group, residue types are ordered based on the length of residue side chain in ascending. The main y-axis is residue frequency and secondary y-axis is relative interface ratio (RIR). The frequencies of residues on interface and non-interface surface are shown in black and gray columns, respectively. The RIR is shown in triangle and line