JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Cholesterol molecular models. Illustration of molecular models of cholesterol (yellow). Cholesterol is a sterol, a type of lipid, a class of biochemical compounds that includes fats. Cholesterol is an essential component of the cell membranes in mammals, and levels of cholesterol in the blood is an important health indicator.
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