Abundance of TE insertions in different features of the D. melanogaster genome.

aNumber of TE insertions (including overlapping ones).bFrequency estimates where obtained for non overlapping insertions having more than ten absence or presence fragments.cNumber of fixed TE insertions (>0.95 frequency).dFraction of fixed TE insertions nfixed/nfe.-not tested.***p**p*pThe associated p-values indicate whether there is a significant difference from the intergenic regions, assessed by chi-square (for density) Fisher's Exact (for number of fixed insertion) or Mann-Whitney U (for median frequency) tests.