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. 2019 Apr 24;10:871. doi: 10.3389/fimmu.2019.00871

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Copyright © 2019 Zhang, Mu, Shan, Sun, Guo, Yu, Tian, Xu and Yang.

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) and the copyright owner(s) 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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TRC repertoires in 37 species. Solid circles: intact genes; solid semicircles: partial segments; hollow circles and (or) semicircles: pseudogenes. The phylogenetic tree was modified from a widely accepted phylogeny of mammals (32–34). The branches with yellow bars indicated the evidence of positive selection estimated by free ratio. The intensity of positive signal in each taxon was calculated following the equation: intensity = total signal/total number of examined branches and nodes. Artiodactyla: 2/5, carnivora: 2/9, euarchontoglires: 1/5, afrotheria: 1/3. Yellow: TRAC, red: TRBC, green; TRGC, blue: TRDC.