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. 2015 Jul 13;6:515. doi: 10.3389/fpls.2015.00515

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Copyright © 2015 Cao, Li, Lv and Ding.

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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Evolution of one PC clade in poplar. (A) Phylogenetic relationships and intron insertion; (B) Hypothetical origins of eleven poplar PC genes by retroposition and tandem duplication. The letters “R” and “T” indicate the positions where retroposition and tandem duplication have occurred, respectively. Bright green vertical line represents conserved 1 phase intron insertion position in PCLD as shown in Supplementary Figure S1.