Repetitive content surrounding the commonly deleted region of the Williams-Beuren Syndrome area of 7q11.23 illustrated using self_dot_plot (H. Skaletsky and S. Rozen, personal communication). Each dot represents an identical match of 200 bp. Direct repeats are shown by horizontal lines, inverted repeats as vertical lines and palindromes as vertical lines that nearly intersect the baseline. Large sequence duplications are indicated by coloured boxes. As indicated by the line break, a central 1.15 Mb of non-duplicated sequence has been omitted. The start of the region shown corresponds to base 70,945,566. Arrows mark the positions of the two phox genes (closed) and the phox pseudogene (open).