Distribution of Promoters in the Human and Fly Datasets Used in This Study.

The table lists the number of promoters in each class, and indicates the presence of CpG islands (human) or TATA boxes (fly) within classes. As the table shows, individual sequence features are enriched in certain promoter classes, but any single feature does not cover any of the classes completely. CpG islands were defined using two sets of criteria: the classic definition of Gardiner-Garden & Frommer [57], and the more stringent definition of Takai & Jones [30] which aims at a better separation from Alu-repetitive elements. TATA-containing promoters were taken from [2].