Polybrene and puromycin were provided by Sigma-Aldrich (St. Louis, MO). The anti-GATA4 antibody was purchased from Abcam. The phosphorylated serine antibody was obtained from Santa Cruz Biotechnology (Santa Cruz, CA). Other antibodies, as reported previously (20 (link), 31 (link)), were provided by Cell Signaling Technology (Beverly, MA) and SignalAntibody (Shanghai, China). Fetal bovine serum (FBS), Dulbecco’s modified Eagle’s medium (DMEM), antibiotics, and other cell culture reagents were provided by Gibco-BRL (Suzhou, China).