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. 2018 May 2;8:6934. doi: 10.1038/s41598-018-25121-4

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© The Author(s) 2018

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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The gene structures of T1R1 and T1R3 genes in grass carp, zebrafish and medaka. The black lines indicate introns and the black boxes indicate exons. Grass carp and zebrafish T1R1 genes contain 7 exons and 6 introns. However, medaka T1R1 has only 6 exons and 5 introns, and the last intron is lost compared with grass carp and zebrafish. Grass carp, zebrafish and medaka T1R3 genes all contain 8 exons and 7 introns.