Inversion breakpoint (4D7-E1 breakpoint of In(1)dl-49) within an intron of CG42594. The 5' (distal) end of this breakpoint corresponds to X:4 ,897,260 and the 3' (proximal) end corresponds to X:4 ,897,262 (release 6 coordinates). This breakpoint is associated with a small (3 bp) duplication.