Figure 2
From: Frequency distribution of TATA Box and extension sequences on human promoters
Three patterns of frequency distribution of TATA elements on the data set S 1000 . Sixteen TATA elements are classified into three frequency patterns: (a)Peak pattern: including two TATA elements(TATAAAAG and TATATAAG) which show very high abundance at the location close to TSSs, but do not show any abundance at other locations; (b)Bottom pattern: including seven TATA elements which show decreasing abundance from 5' end of promoters to TSSs; (c)Bottom-peak pattern: including seven TATA elements which show decreasing abundance from 5'end of promoters to near TSSs, but there is strong abundance at the location close to TSSs which is higher than the other locations.