Summary of the nascent lineages of R1 and R2 in two species. In both panels the elements are diagramed as in Figure 2b. Values below the element diagrams are nucleotide divergences, while values above the diagrams are amino acid (aa) divergences. (a) Nascent lineages of R1 elements in D. grimshawi. For comparison, the relative level of sequence divergence between the R1 elements of D. melanogaster and D. simulans are also shown. The estimated time of separation of these two species is 3 million years . (b) Nascent lineages of R2 elements in D. willistoni. The divergence between the R2 elements of D. melanogaster and D. simulans are shown.
Stage and Eickbush Genome Biology 2009 10:R49 doi:10.1186/gb-2009-10-5-r49