Figure 1.

Frequency distribution of transposable element lengths in the Drosophila genome. Plotted are the lengths (in bp) of individual elements by functional class: LTR (gray), LINE-like (white), and TIR (black). Pairwise tests among all three classes (LTR versusLINE-like, LTRversusTIR, and LINE-like versus TIR) reveal that the distribution of individual element lengths differ significantly between functional classes (Mann-Whitney U test, p < 1 × 10^-6).