Phylogenetic analysis of deduced amino acid sequences of <i>XTHs</i>.

<p>Five <i>DkXTHs</i> (triangle) and 23 <i>XTH</i> homologues from other species were used to generate the phylogenetic tree by MEGA version 5.1 with Bootstrap N-J Tree method (1000 bootstrap trials). Distance scale length of the tree was 0.05. <i>PttXET16A</i> and <i>TmNXG1</i> (rotundity) were the first XET and XEH with three-dimensional structures, respectively. I, II, III-A, and III-B denote different clades of <i>XTHs</i>. GenBank accession numbers are indicated in the figure.