TATA box
The Inr element for core promoters was found to be more prevalent than the TATA box in eukaryotic promoter domains. In a study of 1800+ distinct human promoter sequences it was found that 49% contain the Inr element while 21.8% contain the TATA box. Out of those sequences with the TATA box, 62% contained the Inr element as well. Though the Inr element is not fully understood it has been recognized as the most frequently occurring sequence at the start site of genes in multiple species. Further research can allow for more understanding of the elements that regulate gene production.