Transcriptional factor that can act as an activator or repressor depending on isoform and/orpost-translational modifications. Binds to GT and GC boxes promoter elements. Competes with SP1 for the GC-box promoters. Weak activator of transcription but can activate a number of genes involved in different processes such as cell-cycle regulation, hormone-induction and house-keeping.Pan H., Genomics 77:58-64(2001).The MGC Project Team, Genome Res. 14:2121-2127(2004).Ota T., Nat. Genet. 36:40-45(2004).