TATA box
Mutations in maize promoters affect the expression of the promoter genes in a plant-organ-specific manner. A duplication of the TATA box leads to a significant decrease in enzymatic activity in the scutellum and roots, leaving pollen enzymatic levels unaffected. A deletion of the TATA box leads to a small decrease in enzymatic activity in the scutellum and roots, but a large decrease in enzymatic levels in pollen.