FOXO3a directly binds to FOXO consensus sites in iP2. (A) Recombinant purified FOXO3a was incubated with double-stranded biotinylated probes containing the indicated FOXO consensus sites in iP2 (site 1, site 2, and site 3), or mutated sequences containing the changes shown in Fig. 1 (site 1 mut, site 2 mut, and site 3 mut). Protein:DNA complexes were resolved on nondenaturing acrylamide gels, and the complexes were visualized by chemiluminescence. The data are representative of three independent experiments. (B) Graph showing the decrease in FOXO3a binding to the mutant probes compared to the wild-type probes, which are set to 100%. The graph shows the mean of three independent experiments (*P < 0.05; ***P < 0.0005).