Resource,Source,Identifier Pol II (F-12),Santa Cruz Biotechnology,RRID:AB_630203 RPA194 (C-1),Santa Cruz Biotechnology,RRID:AB_675814 COBRA1,Abcam,RRID:AB_2721176 NELF-A (G-11),Santa Cruz Biotechnology,RRID:AB_10708864 Recombinant Anti-NELFe antibody [EPR11600],Abcam,RRID:AB_2827280 TH1L (D5G6W) Rabbit mAb,Cell Signaling Technology,RRID:AB_2797862 Cdt1 (F-6),Santa Cruz Biotechnology,RRID:AB_10847805 SPT4 (D3P2W) Rabbit mAb,Cell Signaling Technology,RRID:AB_2756442 Monoclonal Anti-alpha-Tubulin antibody produced in mouse,Sigma-Aldrich,RRID:AB_477583 p57 Kip2 Antibody,Cell Signaling Technology,RRID:AB_2291591 p21 Waf1/Cip1 (12D1) Rabbit monoclonal antibody,Cell Signaling Technology,RRID:AB_823586 Histone H3 antibody (mAb),Active Motif,RRID:AB_2650522 Goat Anti-Mouse IgG H&L (HRP),Abcam,RRID:AB_2755049 Goat Anti-Rabbit IgG H&L (HRP),Abcam,RRID:AB_2819160