Example regions of extreme TE density. (a) Structure of HDR16 in the Hsp70B region showing tandem arrays of an invader1→DM88 nest interrupted by 1360 and micropia insertions and flanked by S-element insertions. Duplicate Hsp70 genes are shown at the bottom of the panel along with the non-coding RNA αγ-element. (b) Structure of HDR1 showing tandem arrays of clustered jockey+Rt1c and Stalker4+invader3 elements interrupted by invader2, F-element and mdg3 insertions. This region also generates eight CG32821-like gene duplicates. Note that colors for TE families differ in (a,b).