Phylogeny of HERV-K(HML-2) LTRs. Neighbor-joining tree of LTRs from loci recovered using GAPS. Bootstrap values over 50% are shown. Individual LTRs are named according to the chromosomal location or the bibliographic name of the locus. 5′ and 3′ LTRs are indicated by 5 and 3. Solo LTRs by Solo. ♦ = Human specific. ◊ = Chimp specific. ■ = Present in human, chimp and gorilla. □ = Present in human, chimp, gorilla and orangutan. HSA = human copy of LTR. PTR = chimp copy of LTR. Parentheses (}) highlight proviral loci that are also represented by a solo LTR.