Cell lysis, western blotting and immunoprecipitation were carried as described previously (29 (link)). The antibodies used are: anti-RORγt (Cat No: MAB6109, R&D Systems, Inc.), anti-Foxp3 (236A/E7, Cat No:20034, Abcam), anti-Actin (Cat No: A1978, Sigma-Aldrich, Inc.), anti-Stat3 (79D7, Cat No:4904P, Cell Signaling Technology), anti-Stat5 (D2O6Y, Cat No: 94205, Cell Signaling Technology), anti-PRMT1 (Cat No: ab190892, Abcam), anti-PRMT5 (Cat No:ab109451, Abcam), anti-H4R3(me)2a (Cat No: 39705, Active Motif), anti-H4 (Cat No: 61299, Abcam), anti-Foxp3 (236A/E7, Cat No:20034, Abcam), anti-Actin (Cat No: A1978, Sigma-Aldrich, Inc.), anti-Stat3 (79D7, Cat No:4904P, Cell Signaling Technology), anti-Stat5 (D2O6Y, Cat No: 94205, Cell Signaling Technology), anti-PRMT1 (Cat No: ab190892, Abcam), anti-PRMT5 (Cat No:ab109451, Abcam), anti-H4R3(me)2a (Cat No: 39705, Active Motif), anti-H4 (Cat No: 61299, Abcam),