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. 2017 Jul 26;7:6599. doi: 10.1038/s41598-017-06314-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Characterization of protein N-termini from the category of unknown processing. (A) Amino acid distributions at P1 and P1′ positions of protein N-termini identified at residue 3–65 (blue) and >65 (red) along the protein sequences. (B) A number of proteins according to the proportion of dbTIS PSMs. ‘1’ for x-axis value means that all PSMs are matched to dbTIS, ‘0’ means that the protein was identified only with PSMs corresponding to unknown processing category, and the intermediate values mean that the protein was identified with both type of PSMs. (C) Distribution of acetylated and free protein N-termini belonging to unknown processing category.