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. 2019 Feb 11;7:18. doi: 10.1186/s40168-019-0631-8

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© The Author(s). 2019

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 — Illustration of how much variation there is in the protein groups identified across time and individuals, and how that variation decreases when resolution is restricted to functional groups. a The number of microbial protein groups that were observed across all time points, more than one time point, and only one time point for each individual. b, c KEGG orthologous groups and GoMixer modules, respectively. d The percentage of microbial protein groups, KEGG orthologs, and GoMixer modules that are found across all individuals, more than one individual, and only one individual