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. 2016 Aug 4;10:80. doi: 10.3389/fnana.2016.00080

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Copyright © 2016 Schumann, Hering and Mayer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Phylogeny of opsin genes. The tree illustrates the position of arthropsins as the sister group of r-opsins, including melanopsins (phylogenetic relationships according to Hering and Mayer, 2014).