Onto 100 mm dish (NIPPON Genetics), 0.3×106 MSC-UCs were plated and the culture medium was replaced with the same medium supplemented with 4 ATFs on the next day. The final concentration of each protein was 0.25 nM, and the same procedure was repeated twice a day for 5 days. On day 7, treated cells were harvested by using Accutase (Millipore), and subjected to analysis. No supplements for hepatocytic differentiation such as insulin or transferrin were used.