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. 2019 Dec 6;10:2774. doi: 10.3389/fmicb.2019.02774

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Copyright © 2019 Yuan, Yin, Wang, Qian, Wei, Zhang, Jiang and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Model of T6SS in Citrobacter strains. (A) Phylogenetic tree of select T6SS gene clusters. The figure was made using the sequences of the TssF core component homologs. (B) Genes encoding the T6SS-1, T6SS-2, and T6SS-3 in the indicated Citrobacter strains are shown schematically. Homologous genes are colored similarly (see box below).