Figure 2.

The secondary structure conserved among Lep1 elements. (A) Bombyx mori GenBank accession D86623.1 and (B) Heliconius melpomene GenBank accession CR974474.4 positions 69 560–69 971. Helitron-like features include 5′-CT and 3′-CTRY termini, a 3′-stem-loop is located two to three nucleotides upstream of the 3′-CTRY terminus (nucleotide with parallel grey bars), and a 5′-SIR that is complementary to a 3′-SIR (nucleotide with parallel black bars). Nucleotides involved in the formation of a 5′-IR are paralleled by yellow bars and the structure is shown within the boxed area for H. melpomene.