Probable top-strand cleavage sites for the R2 element insertions. Dots indicate for all R2 elements the last nucleotide at the 5' junction that corresponds to the upstream 28S sequence. In instances where multiple copies of an element within a species had identical junctions, the number of genomic copies was estimated by dividing the number of traces by the fold coverage of the genome sequencing project. Arrows show the location of the insertion site (bottom-strand cleavage used for TPRT). The data were obtained from the following species: D. ananassae, D. melanogaster, D. pseudoobscura, D. sechellia, D. simulans and D. yakuba. (a) Full-length R2 elements. (b) 5' truncated R2 elements.
Stage and Eickbush Genome Biology 2009 10:R49 doi:10.1186/gb-2009-10-5-r49