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Diagram of the promoter sequences of the HbPIP2;1 and HbTIP1;1 genes. The promoter sequences of HbPIP2;1 (A) and HbTIP1;1 (B) were cloned, sequenced, and analyzed for putative cis-acting sequences using the PLACE software. The CAAT and TATA boxes, as well as the ethylene-responsive (ERE), auxin-responsive (ARE), copper-responsive (CuRE), and sulfur-responsive (SuRE) elements, are indicated. The negative numbers represent the upstream ends of the promoter fragments.
