GATA4 and infection: Only the Mef2c-Gata4-Tbx5 (MGT) and Mef2c-Tbx5-Gata4 (MTG) constructs, which have Mef2c in the first position, increase reprogramming efficiency compared to infection with three separate Gata4, Mef2c, and Tbx5 viruses (Wang et al., 2015a).