TFBS display a clear positional bias within the TSS. The relative position of each conserved TFBS from the TSS was determined. (a) Histograms of the most relevant TFBS families. These graphs represent the number of occurrences of each TFBS identified in a 50 bp bin relative to the TSS (position 0). (b) Overlapping Frequency Distribution Curves for each TFBS Relative to the TSS which show that each TFBS clusters in slightly different positions.