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. 2017 Apr 20;7:994. doi: 10.1038/s41598-017-01144-1

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© The Author(s) 2017

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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Gene partitioning patterns of ulvophycean chloroplast genomes. The suite of genes in each IR-containing genome is displayed so that the SC region with the gene content the most similar to that predicted for the ancestral SSC region of core chlorophytes is presented at the bottom of the figure. Thick vertical lines delimit the genes encoded in the IR (thick black lines, identical IR copies; thick brown lines, divergent IR copies). The genes making up the rDNA operon are highlighted in yellow whereas those present in the SSC region of Trichosarcina are highlighted in blue. Red letterings designate the genes of ancestral LSC origin that have been acquired by the IRs of core chlorophytes.