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Conserved structures of nonautonomous LTR-retrotransposons documented in plant genomes. Autonomous refers to the structure of complete LTR-retrotransposons (here Copia-like): The coding regions are in gray; the PBS motif is represented as a black triangle and the PPT is represented as a white triangle; GAG, capsid; AP, aspartic protease; INT, integrase; RNAse, RNAse H. BARE-2 refers to the BARE-2 nonautonomous found in barley (Tanskanem et al. 2007).
