In molecular biology, a GC box is a distinct pattern of nucleotides found in the promoter region of some eukaryotic genes upstream of the TATA box and approximately 110 bases upstream from the transcription initiation site. It has a consensus sequence GGGCGG which is position dependent and orientation independent. The GC elements are bound by transcription factors and have similar functions to enhancers.
^Klug WS, Cummings MR, Spencer CA, Palladina, MA (2009). Concepts of Genetics: Ninth Edition. San Francisco: Pearson Benjamin Cummings. pp. 463–464. ISBN978-0-321-54098-0.