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Phylogenetic trees of the MAPKKK family genes in Arabidopsis, rice, maize and G. raimondii. The unrooted tree was generated by the MEGA v5 program using the neighbor-joining method. Bootstrap values from 1000 replicates are indicated at each branch. The phylogenetic trees were constructed based on the full-length protein sequences of the MAPKKKs. At, Arabidopsis thaliana; Os, Oryza sativa; GRMZM, gene model IDs from the Maize Genome Sequencing Project.
