In fact, the most common type of core promoter is the Tata box core promoter. And the reason we call it Tata box is because the sequence of nucleotides is Tata, and that doesn't change when we go from one eukaryotic gene to another. So that recurs between different or that recurs within different types of eukaryotic genes. Now, what's so special about the Tata box? What's so special about the core promoter in general? So this is where all the different types of transcription factors and regulatory proteins actually bind to, and they form a complex that consists of over 50 different types of proteins.