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Cholesterol is a component of cell membrane and cell membrane, red blood cells, hepatocytes, myelin sheath of the plasma membrane contains a considerable amount of cholesterol, it regulates the physical state of biofilm lipid, to maintain membrane fluidity. The myelin sheath contains a large amount of cholesterol. It is related to the formation of myelin sheath, maintaining stability and function. In addition, cholesterol is a precursor to the synthesis of bile acids and steroid hormones. 7-dehydrogenation of cholesterol in animal skin, under ultraviolet irradiation can be converted into vitamin D3.