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. 2020 Dec 21;39(5):578–585. doi: 10.1038/s41587-020-00774-7

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© The Author(s) 2020

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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Fig. 5 — a, Estimated completeness of IMG/VR contigs by biome. b, Distribution of IMG/VR contig length across quality tiers: complete (n = 13,700), high quality (n = 16,544), medium quality (n = 45,109), low quality (n = 634,117) and undetermined (n = 14,399). For proviruses, only the size of the predicted viral region was considered. c, Proportion of IMG/VR contigs predicted as proviruses by biome (left). Sequences predicted with >50 ambiguous bases (Ns) or potential concatemers were classified as low quality. Putative nonviral sequences in IMG/VR were not included (>5 host genes and >2× host versus viral genes). Length of the predicted host region by biome for IMG/VR contigs predicted as proviruses (right). Region length is indicated as a percentage of total contig length. d, Proportion of contigs predicted as proviruses by contig length. e, Percentage of all genes from predicted proviruses found in viral/host regions (left). Percentage of metabolic genes from predicted proviruses found in viral/host regions (right). f, Percentage of genes from selected KEGG pathways for predicted proviruses found in viral/host regions. For box plots, the middle line denotes the median, the box denotes the IQR and the whiskers denote 1.5× IQR. Misc., miscellaneous.