Probably the smallest transposable element in eukaryotes (1,286 bp). It has not been observed in Drosophila melanogaster but has been detected in African species of the D. melanogaster subgroup, D. sechellia (1-2 copies), D. simulans (usually 2 copies), D. yakuba (about 4 copies), D. teissieri (10 copies), and D. mauritiana (20 to 30 copies). Mariner-like element has been detected also in soybeans.
The target in the untranslated leader of the w pch is 5′- TGGCGTA↓TAAACCG-3′. The arrow marks the insertion and the TATA indicate probably the target site duplication. Mariner is different from other transposable elements inasmuch