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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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Features of protein N-termini. (A) Distribution of acetylated N-termini and free N-termini according to the type of N-termini. The data are presented in percentage values, and the exact numbers of protein-N-termini are denoted within bars. (B) The amino acid frequency at the second residue of acetylated or free protein N-termini. ‘The second residue’ means the residue next to the initiator methionine. (C) The amino acid frequency at the flanking region of signal peptides and transit peptides. The protein sequence logos were generated using the iceLogo software package with correction for natural amino acid abundance. The red arrows indicate observed cleavage sites.