The expression of H1f1α, Snai2, Twist1/2, and Zeb1 was modulated with overexpression or sh-RNA-mediated knockdown via a retrovirus system during reprogramming with mES (B) The expression of Bmi1, Ctcf, Ezh2, Kdm2b, Wdr5 was determined on day 6 with qPCR and normalized against those in MEFs. The comparisons were performed between all groups and corresponding Flag groups. 