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. 2021 Apr 8;11:7807. doi: 10.1038/s41598-021-87236-5

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Absence of the TAAR-specific fingerprint motif in taar-like genes. The characteristic fingerprint motif (black bar) of taar genes¹⁶ and the respective homologous sequence regions in taar-like genes (TARL) and aminergic receptors (AmR) are vertically aligned. Grey bar, transmembrane region 7. Note that the positions of the motif denoted by empty rectangles are highly conserved in all gene groups shown. In stark contrast, the two TAAR-specific positions of the motif (Y and W, filled rectangles) are differently conserved-N instead of Y (tarl genes from jawed and jawless fish, and aminergic receptors)-S instead of W (tarl genes from jawed fish)—or not conserved in non-taar genes. Asterisks, additional amino acids are conserved in all tarl genes; empty circles, amino acids only conserved in tarl genes from jawed fish.