JQ1 (2 (link)) and CGP57380 (21 (link)) were purchased from Tocris Bioscience; OTX-015 (22 (link)) and ARV-825 (11 (link)) were obtained from Selleckchem; U0126 (23 (link)) was from Cell Signaling; and SB202190 (24 (link)) and NSC23766 (25 (link)) were purchased from Calbiochem.