FIGURE 9-34 Model of the enhanceosome that forms on the β-interferon enhancer. Two heterodimeric factors, Jun/ATF-2 and p50/RelA (NF-κB), and two copies each of the monomeric transcription factors IRF-3 and IRF-7, bind to the six overlapping binding sites in this enhancer. See D. Penne, T. Manniatis, and S. Harrison, 2007, Cell 129:1111.