Figure 2
From: Abundant and species-specific DINE-1 transposable elements in 12 Drosophila genomes
The generalized structure of DINE-1 sequences from 12 Drosophila genomes, and alignment of the DINE-1 consensus sequences from 12 species with each feature boxed. The element contains two conserved blocks, A and B. Within block A, the sequence can be further divided into two parts, A1 and A2, separated by a region of variable length containing the tandem repeats (CCGT)n(CTGT)n. Between blocks A and B is a region of central repeats, containing species-specific repeats. These central repeat sequences do not share homology among species; the length of the repeat unit can range from approximately 50 bp to approximately 500 bp, and the number of repeats is also variable within species. Locations of the subTIRs are shown as gray arrows; see Table 1 for precise designations of subTIR sequences. The 5' end also contains a second inverted repeat (IR) sequence that is partially complementary to the 5'-end terminal repeat and is shown as a gray arrowhead. An inverted repeat near the 3' end forms a potential stem-loop structure and is indicated by white arrowheads.