Frequency distribution of fourteen TATA Box extension sequences on S
. Fourteen TATA extension sequences are found to show very high abundance at the location close to TSSs. Seven of them extend TATA elements from the left side as shown in Figure 4(a), and seven others from the right side as shown in Figure 4(b). Thirteen out of these fourteen sequences extend from TATAAAAG or TATATAAG. Calculation of p values for these fourteen sequences demonstrates that their high motif factors are not obtained by chance.