A hepatocyte is the main type of cell found in the liver, and thus is often simply called a “liver cell” or a “hepatic cell”. Hepatocytes have many functions, including synthesis of proteins, cholesterol, and lipids, detoxification and excretion of toxic substances and the secretion of bile. The fact that stem cells can be changed into immature hepatocytes has great promise for creating products for treating liver diseases and for drug testing.