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. 2015 Apr 13;8:144. doi: 10.1186/s13104-015-1082-3

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© Buchberger and Lamparter; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Cartoon representation of major events during the evolution of streptophyte phytochromes. D indicates the duplication of phytochrome genes that gave rise to A- and B-type phytochromes. X indicates loss of A-type phytochromes; R indicates the rearrangement of PGP and PAS/PAS/HK in the evolution of gymnosperm P-type phytochromes. Secondary endosymbiosis is indicated by the curved arrow. The overall domain arrangement of diatom (heterokont, left) and streptophyte phytochrome is also shown.