Structure of repeated sequences observed within DIRS1-like retrotransposons. The left (lTer) and right (rTer) termini as well as the left (lICR) and right (rICR) ICRs are represented by triangles. ITRs are represented by bubbles. Blue items correspond to the complementary lTer and the lICR sequences. Green items correspond to the complementary rTer and the rICR sequences. Colored parts of the lTer and rTer that do not overlap red bubbles symbolize the lE and rE sequences. A: Element harboring only one extension (here the rE sequence). In this case, the lICR is only complementary to the left ITR (lITR); B: Elements harboring both the lE and rE sequences.