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Phylogenetic trees of six orthologous 4CL genes between four poplar species and Arabidopsis for molecular evolution analyses. The trees were reconstructed using NJ with 100 bootstrap replicates. Based on the orthologs belonging to Clade A or Clade B in Figure 2, A and B represent Clade A and Clade B, respectively, so the desert poplar clades (P. pruinosa and P. euphratica) were assigned to A1 or B1 and the other species were assigned to A2 or B2.
