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. 2019 Feb 1;19:28. doi: 10.1186/s12866-019-1402-1

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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. 2 — Maximum likelihood phylogeny of translated DtxR sequences from different Corynebacterium species. Translated DtxR sequences of all 137 toxigenic and non-toxigenic Corynebacterium spp. isolates were extracted, aligned and a maximum likelihood tree was built. Species affiliation is indicated by background coloring: C. diphtheriae = blue, C. pseudotuberculosis = pink, typical C. ulcerans = orange, atypical NTTB C. ulcerans = green. Results of tox qPCR and Elek tests are indicated by circle and triangle shaped bars, respectively: positive = black, negative = white. The type of detected tox-surrounding mobile genetic regions is indicated by colored boxes on the right side of the tree: prophage = turquoise, alternative PAI described in [7] = yellow, different PAI than the one described in [7] = purple