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. 2017 Jun 16;8:15853. doi: 10.1038/ncomms15853

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Copyright © 2017, The Author(s)

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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Assignments for gene functions are based on previous studies cited in the main text and our observations: Black—structural components; Green—secreted structural components; Purple—secreted effectors; Blue—unfoldase; White—no clear evidence for function; Shaded—required for efficient assembly. The Francisella FPI (pdpA–anmK) nomenclature and the canonical T6SS nomenclature for the F. novicida genes is shown. Genes are drawn in scale.