Immunoprecipitation from MDA-MB-231, A431 or H1299-R273H cytoplasmic extracts was performed as previously described.55 (link) For each IP, 2.0 μg of anti-p53 (D0–1, Santa Cruz, Santa Cruz, CA, USA), anti-p63 (H-137, Santa Cruz), anti-p73 (Bethyl, Montgomery, TX, USA), anti-Ago2 (Mouse 2A8), rabbit IgG, mouse IgG and anti-HA beads was used. ChIP assays (Primer sequences in Supplementary Table S9) were performed as described previously.32 (link)