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. 2019 Feb 22;10:277. doi: 10.3389/fmicb.2019.00277

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Copyright © 2019 Mareš, Strunecký, Bučinská and Wiedermannová.

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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Phylogenetic tree of cyanobacteria inferred from the SSU rRNA gene with traced evolution of thylakoid arrangement. The tree was calculated using BI from an alignment of 298 sequences spanning 1477 nucleotide positions. Estimated posterior probabilities are displayed near the nodes. Numbers in parentheses represent the number of sequences in collapsed branches. Color-coded thylakoid arrangements in non-terminal nodes were inferred using the parsimony ancestral reconstruction method. Special features in thylakoid architecture are indicated with pictograms. Reconstructed convergent occurrences of the parietal arrangement are marked with filled black circles. Selected nodes, which are referred to in the main text, are numbered to facilitate tree description. Collapsed nodes containing taxa with a single category of thylakoid arrangement together with taxa with unknown ultrastructure are color-coded according to the known category. PSC clade = Prochlorococcus, marine Synechococcus, and Cyanobium.