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Liver is involved in the metabolism of carbohydrates, proteins and lipids . In carbohydrate metabolism, it is involved in gluconeogenesis, glycogenesis and glycogenolysis. In protein metabolism, it is responsible for amino acid synthesis. It also forms clotting factors, urea and thrombopoietin. In lipid metabolism, it is involved in cholesterol and triglycerides synthesis. It also plays a role in the process of lipogenesis. Liver also stores vitamins (A, D, B12) and iron. It also plays an important role in alcohol and drug metabolism.