Figure 1.

Schematic representation of the ascidian non-LTR retrotransposons. The conserved domains are depicted on the sequence derived from the Ciona scaffolds (thick line). Thin lines correspond to the physical segments covered by the scaffolds, which are numbered on the left. For clarity, indels are not shown. APE, apurinic/apyrimidinic endonuclease; REL-endo, restricted enzyme-like endonuclease; RNH, RNase H domain; RT, reverse transcriptase. Vertical bars indicate the location of cysteine-histidine motifs typical of nucleic acid-binding domains.