Western blotting was performed as described [9 (link)] on 30 μg of protein/sample with antibodies against EZH2 (E7031, Sigma-Aldrich; 1:2000 dilution), actin (sc-1616, Santa Cruz; 1:5000), HA-tag (sc-805, Santa Cruz; 1:2000), histone H3K27me3 (ab6002, Abcam; 1:1000), histone H3K27ac (ab4729, Abcam; 1:1000), total histone H3 (#4499, Cell Signaling; 1:1000), p53 (ab28, Abcam; 1:2000), C/EBP β (sc-7962, Santa Cruz; 1:2000), p300 (#54062, Cell Signaling; 1:500), CBP (#7389, Cell Signaling; 1:500), BRG1 (#49360, Cell Signaling; 1:500), cleaved caspase 3 (#9661, Cell Signaling; 1:1000), and cleaved PARP (#5625, Cell Signaling; 1:1000).