From The School of Biomedical Sciences Wiki
"TFIIA is thought to be the next protein to bind to the transcription-initiation complex. It joins TFIID and TBP at the promoter, where footprinting indicates it covers base pairs from –80 to –17 from the start site for transcription " 
- ↑ University of Maryland. (2003). TFIIA. Available: http://www.biochem.umd.edu/biochem/kahn/molmachines/newpolII/TFIIA.html. Last accessed 23rd October 2014.