INF-α/β– and INF-γ–inducible complexes detected in DMSA using BG1 probe and nuclear extracts from BALB/3T3 or A20-2J cells. Cells were treated with IFN-α/β or IFN-γ for 15 minutes where indicated. The specificity of these complexes is shown by competition with O15 or SIE oligonucleotides. **, Inducible complex.