http://genomewiki.ucsc.edu/images/a/a7/29mammals2xARs_track.txt
http://genomewiki.ucsc.edu/images/e/ed/29mammalsNovelExons_track.txt
http://genomewiki.ucsc.edu/images/5/5e/29mammalsExaptedElements_track.txt
http://genomewiki.ucsc.edu/images/f/fd/29mammalsMotifInstances_track.txt
http://genomewiki.ucsc.edu/images/a/ac/29mammalsConstraintStructure_track.txt
http://genomewiki.ucsc.edu/images/2/28/29mammalsConstrainedElements_track.txt