Figure 7.

Cation/Ca²⁺ exchanger family phylogenetic tree. The tree was constructed using genes identified in the CCX group of the full CaCA tree (Figure 3). Three CCX sub-groups are highlighted. Branch labels include the species name abbreviation defined in Figure 2 and are colored according to the species class using the same color code as in Figure 3. Bootstrap values are indicated at the nodes of major branches. The branch length scale bar indicates the evolutionary distance of 0.7 amino acid substitutions per site. Genes that are highlighted with an asterisk encode transporters for which the ion specificity has been determined.