Arabidopsis thaliana Metaviridae and Pseudoviridae reverse transcriptase diversity. Phylogenetic trees used in this figure are adapted from [14,18]. Each tree is based on ClustalX  alignments of reverse transcriptase domains for elements in a given family. Neighbor-joining trees (10,000 bootstrap repetitions) were generated using MEGA2 . The non-LTR retrotransposon Ta11 served as the root for both trees. The three Metaviridae sublineages are boxed.