Insertional duplication of LCR17pB. After the divergence of gorilla and orangutan, the LCR17pA/B portion of LCR17pA was duplicated and inserted near middle SMS-REP to give LCR17pB (pink and yellow). The comparison between LCR17pA and LCR17pB copies reveals that two DNA segments (shown as red rectangles) were deleted and are not present in the LCR17pB copy. They were lost during the duplication event or after the LCR17pB insertion. The LCR17pB segment was either inserted directly adjacent to the middle SMS-REP on the telomeric side (and subsequently inverted together with the middle SMS-REP; Fig. 6) or inverted and inserted directly adjacent on its centromeric edge (see Discussion).
