Figure 3.

Phylogenetic analysis of HERV-K elements that conform to predicted topology. Maximum-parsimony trees are shown for each element. Branch lengths are proportional to the number of changes occurring along a lineage. Bootstrap values taken from 100 replicates are shown. Nodes without indicated bootstrap values had very high support, ≥95%. Human 5′ and 3′ LTR sequences of closely related HERV-K elements were used as outgroups in each analysis and are indicated by element name. HERV-K3p25 is not full length in the chimpanzee and bonobo, but a solitary LTR, which is formed by homologous recombination between the 5′ and 3′ LTRs, was found at this locus and included in the analysis.