Fig. 1.

Maximum-likelihood tree based on the amino acid sequences of RT from diverse LTR retrotransposons, retroviruses (RetroVir), caulimoviruses (CaulimoVir), and DIRS elements. Statistical support was evaluated by the approximate likelihood-ratio test (aLRT) and is shown at the corresponding nodes of the tree. Retroviruses and aRNH-containing LTR retrotransposons are highlighted in blue and green, respectively. The complete phylogenetic tree with accession numbers and names of the elements is presented in supplementary figure S1, Supplementary Material online.