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An unrooted, neighbor-joining (NJ)-based tree of the CAX (CAtion eXchanger) subfamily in selected plants. The analysis was performed as described in the “Materials and methods” section and the tree was generated using MEGA version 4.1 [28] after sequence alignment. Bootstrap values are indicated (1,000 replicates). Branch lengths are proportional to phylogenetic distances. Corresponding gene loci are given in a supplemental file and names of the species are given in the legend of Fig. 1
