The reverse tetracycline-controlled transactivator rtTA2-S2 is toxic in mouse embryonic stem cells Vitezslav Bryja, Jiri Pachernik, Lukas Kubala, Ales Hampl and Petr DvorakReprod. Nutr. Dev., 43 6 (2003) 477-486DOI: https://doi.org/10.1051/rnd:2004001