Fig. 5

Phylogeny of ITm elements based on their DDE domains. The phylogeny is based on the alignment shown in (Additional file 1: Figure S5) of the ~ 150 aa catalytic DDE domains of the elements listed in (Additional file 2: Table S6). The phylogeny is a maximum likelihood tree, rooted with bacterial IS630 elements. The numbers at some nodes represent the percentage of bootstrap values for 100 replicates if 50% or greater. Clade names are in bold to the right of the tree. As in [22, 26], the names include the distance between the last two catalytic residues. Most of the elements in the ciliate clade are D32E, however those with one star are D33E and those with two stars are D34E. The amino acid divergence scale is indicated