Figure 4

Relationships between insertion dates and chromosomal locations of LTR-RTs. In total, 21,165 LTR-RTs with an estimated insertion date have been grouped within four classes: 0 to 1 MYA (blue), 1 to 2 MYA (purple), 2 to 3 MYA (green), >3 MYA (red). (A) Distribution of the number of LTR-RTs for each of these four categories along chromosome 3B. Distribution was calculated in a sliding window of 10 Mb with a step of 1 Mb. Recombinogenic distal and centromeric/pericentromeric regions [42] are labeled by grey and hatched areas, respectively. (B) Box plot of the number of TEs per 10 Mb sliding window carried by the recombinogenic distal regions (D), the internal parts of the chromosome arms (I), and the centromeric/pericentromeric regions (C).