Representation of TF PWMs in the cell cycle phase clusters. The eight circles correspond to the PWMs that were highly enriched in promoters of cell-cycle-regulated genes (Table 3). Each circle is divided into five zones, corresponding to the phase clusters. The number adjacent to the zone represents the ratio of its prevalence in promoters contained in each of the cell cycle phase clusters to its prevalence in the set of 13K background promoters. Note that several TFs show a tendency toward specific cell cycle phases, for example, overrepresentation of the E2F PWM in promoters of the G1/S and S clusters and its underrepresentation in promoters of the M/G1 cluster.
