Three cases of TE insertions into internal exons in D. melanogaster. Schematic representations of TE insertions into Drosophila internal exons. White boxes and lines represent exons and introns, respectively. The grey boxes show insertion of TEs into exons. The TE family is indicated beneath the gray box, along with the length of each inserted TE. Lengths of the introns and exons flanking the inserted exon are indicated. Genes with insertions are (a) cno, (b) CG14821 and (c) nej. CDS, coding sequence.