Cumulative distribution functions of RP scores for different functional classes. These include bidirectional promoters (red, green, blue), non-bidirectional promoters (purple) and unbounded promoters (light blue, pink, light green). Other functional elements are coding regions (aqua), tail-to-tail regions (yellow) and enhancers (maroon). The nonfunctional elements are represented by ancestral repeats (black).
Yang and Elnitski BMC Genomics 2008 9(Suppl 1):S2 doi:10.1186/1471-2164-9-S1-S2