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. 2019 May 28;10:492. doi: 10.3389/fgene.2019.00492

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Copyright © 2019 Cheng, Ahammed, Yao, Ye, Ruan, Wang, Li, Zhou and Wan.

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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Phylogenetic tree of WRKY proteins from pepper, tomato, potato, Arabidopsis and rice using the neighbor joining method by MEGA 5.0. The WRKYs of each group were clustered together and labeled with different colors. The root nodes of Cluster A, Cluster B, and Cluster C were marked with red solid circles. Group IIf and IIg were two newly identified subgroups that only comprised WRKYs from Solanaceous plants. WRKYs from pepper (CaWRKY), tomato (SlWRKY), potato (StWRKY), Arabidopsis (AtWRKY), and rice (OsWRKY) are labeled in red, blue, black, green and yellow, respectively.