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Phylogenetic tree of the MPK family in Arabidopsis thaliana, Oryza sativa, Manihot esculenta, and Hevea brasiliensis. The phylogenetic tree was constructed by ClustalX 2.0 and MEGA5.0 software using the neighbour-joining (NJ) method and 1000 bootstrap replicates. The names of the MPKs from the four species are shown in different colours. Four distinct clades (groups A–D) are highlighted. The vertical bar indicates evolutionary distance.
