FIG. 1.

Dendrogram derived from 37 HERV-K LTR sequences. The names of each sequence refer to the GenBank accession numbers from which the HERV-K LTRs were identified. The names of previously described HERV-K elements are shown in parentheses, where 5′ and 3′ refer to the LTRs flanking the proviral element. GenBank entries containing more than one LTR sequence are indicated by an a or a b following the accession number. All LTRs used were complete sequences of approximately 970 bp, except for the IDDM-associated element, for which only 809 bp of LTR sequence is available in GenBank (accession no. AF012335). The values at the nodes indicate the percentage of the bootstrapped trees supporting the branching pattern, and the numbers in parentheses indicate the clusters referred to in the text. The length of the bar corresponds to a nucleotide sequence divergence of 2%.