Figure 4.
Phylogeny of the integrase and reverse transcriptase genes for copia (A) and gypsy (B) families. Phylogenies were made in PhyML. Bootstrapped values from 1000 pseudo-replicates of the data are presented next to the branch. Two Z. mays sequences were used as outgroups for each phylogeny. Average insertion dates (SE) for each family are presented on the integrase tree for each superfamily.
