ChIP assays were described earlier [23 (link), 43 (link)]. The following antibodies were used to precipitate DREAM, MMB, and E2F complex components: E2F4 (C-20, sc-866; Santa Cruz Biotech.) [44 (link)], E2F1 (C-20, sc-193; Santa Cruz Biotech.), E2F2 (C-20, sc-633; Santa Cruz Biotech.), E2F3 (C-18, sc-878; Santa Cruz Biotech.), LIN37 (T1, custom-made at Pineda Antikörper-Service, Berlin, Germany), BMYB (N-19, Santa Cruz Biotech.), FOXM1 (C-20, sc-502, Santa Cruz Biotech.) [33 (link)], and NF-YA (G-2, sc-17753; Santa Cruz Biotech.). The E2F3 antibody was directed against the C terminus of the protein and did not distinguish between E2F3A and E2F3B, which differ in their N-terminal domain [45 (link)]. As a negative control for the ChIP experiments, rabbit IgG was used (Rabbit IgG Isotype control, No. 02-6102; ThermoFisher Scientific).
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