Comparison of Arabidopsis and rice octamers. (A) 987 octamers that are LDSS-positive in either Arabidopsis or rice promoters were selected and their Relative Peak Height (RPH) was compared and expressed as a scatter plot. Each dot is data from an individual octamer sequence. (B) LDSS-positive octamer sequences of Arabidopsis and rice were compared, and common sequences found in both sets were identified. The figure shows the number of octamer sequences. Classification into the Y and TATA groups were done based on distribution profiles as shown in Figure 5. The REG group has a peak position between -51 and -200.