Figure 2. Schematic structure of four 1Bx promoters.

Regulatory elements are indicated by colored rectangles. InDels are labeled with hollow boxes and core sequences are listed in detail under the sketch map. The red underlined sequence shows the “cereal box” in the 54 bp duplication. The 8 bp bases in red at both ends indicate the target site duplication (TSD) of the MITE. Positions of upstream primers used for obtaining truncated promoters are indicated with black arrows.