Figure 4.

Several groups in the REG-type bipartite octamers. 1,053 bipartite octamers with distribution profiles of the REG type (Fig. 2C) were mapped to 24,714 Arabidopsis promoters, and a resultant presence/absence matrix (1,053 × 24,714) was subjected to 2D clustering analysis (A). Presence and absence of an octamer in a promoter is shown as red and black, respectively. Labels of the matrix in vertical and horizontal dimensions are omitted. Octamers of 20 largest clusters were subjected to WebLogo (B). Some pairs of cluster (1–9, 2–15, 3–4, 5–7, 10–17, 12–13) are complementary, respectively. Clusters 5 and 7 are ERSE (CCAAT-N₉-CCACG).