Illustration of YR Rule, Y Patch, TATA box, and REG. (A) Expected appearance positions relative to the TSS are as follows: YR Rule (-1/+1), Y Patch (-100 to -1), TATA box (-50 to -20), REG (-20 to -400). Among them, only the REG is orientation-insensitive, and the other groups are sensitive. In many cases the Y Patch locates between the TATA boxes and the TSS, but it is also observed upstream of the TATA boxes. (B) An example of an Arabidopsis promoter that has a Y Patch and TATA box. At1g10960 is one of the promoters clustered in Figure 6B. The promoter sequence from -100 to +1 is shown together with octamer motifs. Marks on the sequence are the same as illustrated in (A).