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. 2018 Dec 1;15:39. doi: 10.1186/s12014-018-9211-3

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© The Author(s) 2018

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 — The human endogenous tryptic peptides and/or phosphopeptides where precursor intensity is greater than E4 (10,000) arbitrary detector counts after selecting the best fit of MS/MS spectra from 2+ or 3+ ions and selecting the single best peptide fit for each MS/MS fragmentation spectrum (Filter 2). a the SEQUEST algorithm; b the X!TANDEM algorithm