Structural organization of Arabidopsis thaliana Athila4 elements. Boxes with filled triangles represent LTRs. Open boxes represent coding sequences, and they are offset to indicate changes in reading frame. Vertical thin lines represent stop codons. Horizontal thin lines represent noncoding sequences. The shaded region identifies the coding region for reverse transcriptase. Shaded boxes indicate the putative envelope (env) gene. The accession number, the BAC designator, and the position within the BAC for each Athila4 element are as follows: Athila4-1:AC007209, F1404, 33315 to 47208; Athila4-2: AB026642, MED5, 3448 to 17452; Athila4-3 and Athila4-4: AC007534, F7F22, 88613 to 114709; Athila4-5: AL353871, F7K15, 86117 to 99436; Athila4-6: AF296831, F1809, 38836 to 52851.
