The organization of the linker domain/3'LTR junction of Ty1/copia retrotransposons. (A) Genome structure of Ty1/copia retrotransposons, of which Sireviruses may contain an envelope-like gene. (B, C) Organization of the Sirevirus and classic elements linker domain/3'LTR junction. The IR arms (yellow) surround the loop sequence, of which the terminal PPT octamer (red) occupies the outmost 5' side. Classic elements with nucleotides in bold indicate the region, where the left arm is located at the 3' end of the pol gene region, due to the very short linker domain.
Bousios et al. BMC Genomics 2010 11:89 doi:10.1186/1471-2164-11-89