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. 2020 Dec 15;9(12):giaa139. doi: 10.1093/gigascience/giaa139

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© The Author(s) 2020. Published by Oxford University Press GigaScience.

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 reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3: — Expansion of nervous system–related genes. a, Phylogentic tree of BTBD6 genes in the examined species. The grey ellipses mark different clusters of genes. b, Expansion pattern of BTBD6 genes in 2 deep-sea snails. Grey lines represent scaffold sequences. Coloured rectangles represent BTBD6 genes. Symbols “//” represent other genes along the scaffolds. The blue numbers “1” represent only 1 gene between the tandem duplicated genes. c, Expansion of HTR4 genes. The species legend in the middle applies to a and c. Gene trees of a and c were constructed using MUSCLE (v3.8.31) [72] and FastTree (v2.1.10) [27].