TATA box
Promoter sequences vary between bacteria and eukaryotes. In eukaryotes, the TATA box is located 25 base pairs upstream of the start site that Rpb4/Rbp7 use to initiate transcription. In metazoans, the TATA box is located 30 base pairs upstream of the transcription start site. While in yeast, "S. cerevisiae", the TATA box has a variable position which can range from 40 to 100 bp upstream of the start site. The TATA box is also found in 40% of the core promoters of genes that code for the actin cytoskeleton and contractile apparatus in cells.