SPRTN protease and checkpoint kinase 1 cross-activation loop safeguards DNA replication by Halder, S, Torrecilla, I, Burkhalter, MD, Popović, M, Fielden, J, Vaz, B, Oehler, J, Pilger, D, Lessel, D, Wiseman, K, Singh, AN, Vendrell, I, Fischer, R, Philipp, M, Ramadan, K