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. 2019 Jan 14;20:38. doi: 10.1186/s12864-018-5412-4

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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 — The distribution of ubiquitin-NiSOD and ubiquitin-IMP fusions throughout major eukaryote lineages. The cladogram shown is based on Burki et al. (2016). A filled circle represents the presence of a given fusion (NiSOD = green, IMP = blue) within a particular group, while the number inside a circle indicates the number of unique species that contain the ubiquitin fusion protein. A dashed line in the backbone of the tree represents uncertainty in phylogenetic placement of the corresponding lineages. The single ubiquitin-NiSOD fusion shown in Stramenopiles under ‘Other heterotrophs’ corresponds to a sequence from the marine labyrinthulid Aplanochytrium stocchinoi; it is unclear whether this sequence comes from this non-photosynthetic organism or is an algal contaminant (see text)