Figure 3
From: Conserved structure and inferred evolutionary history of long terminal repeats (LTRs)
RT-based inference of retroelement phylogeny. ClustalW [40], and the maximum likelihood algorithm, as embodied in the Mega program package [41], was used with 500 bootstrap replicates and default parameters. The bootstrap percentages are shown at each bifurcation. RT consensus sequences were obtained from the Gypsy database (LTR retroelements), or from GenBank (Line1 and Penelope).