Fig. 3From: Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposonsPhylogenetic relationships among L2 elements based on the reverse transcriptase domains of ORF2. The base composition of each element is shown above the tree. The tree was built with the maximum likelihood method using the LG + G + I + F model of mutation and its robustness was assessed by 500 bootstrap replicates. Nodes that are supported by bootstrap values higher than 70% are indicated with an asterisk. Roman numbers I to VI refer to the L2 sub-clades (see text)Back to article page