Deletion sequences. The exact coordinates of the 40-bp deletion in NA13707 can be determined by examining reads that map to the reference sequence in the region of interest in an interrupted manner. The reference sequence is shown in the center with the known 40-bp deletion region underlined. From 928 reads aligning to this region, 28 selected reads with different end points are shown. Forward reads (left to right) are in black, and reverse reads (right to left) are in blue. Deletions relative to the reference are shown by dashes and insertions by bolding and underlining the adjacent base.