SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY SPRINGER MEDIZIN / SCIENCE PHOTO LIBRARY
Cholesterol lipoprotein. Cutaway computer artwork showing the structure of a lipoprotein particle. Lipoproteins are the major carriers of cholesterol in the blood and are mainly composed of lipids. The complex structure includes carrier proteins (green slime-like) known as apo-B proteins, which assist transport in the blood. The outer coat consists of phospholipids (stalked spheres) and free cholesterol molecules. Within the core, cholesterol molecules (yellow) are bound into long esters by fatty acid chains.
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