A Snapshot of BURs captured by high-throughput sequencing in a region on chromosome 2. (Top) UCSC Genome Browser tracks showing distribution of Satb1-binding sequences, BURs (top track, Satb1 in vitro binding; bottom track, input control). (Bottom) DNA sequence from the starred region from the top panel. DNA sequence in blue represents ATC sequence stretches, and DNA sequences in red represent ATG sequence stretches. The colored sequences represent the ATC sequence context, typically found in BURs.